Table of Contents

Stainless steel pipes by Stanley Alloys — durable, corrosion-resistant, and ideal for industrial applications

Stainless Steel Seamless Pipes

Stainless Steel Seamless Pipes – Introduction

Introduction & Overview

Stainless Steel Seamless Pipes are highly durable and versatile tubular products widely used across industries where strength, corrosion resistance, and reliability are critical. Manufactured without any welds or seams, these pipes deliver superior mechanical properties, uniform structure, and excellent resistance to high pressure and temperature conditions. Available in grades such as 304/304L, 316/316L, 317L, 321, Duplex, and Super Duplex, they are extensively utilized in oil & gas, petrochemicals, power generation, pharmaceuticals, food processing, construction, and marine sectors. Their smooth internal surface ensures better fluid flow, reduced pressure drop, and long service life, making them the preferred choice for demanding environments that require precise dimensional accuracy, high tensile strength, and exceptional corrosion resistance.

As a leading ASME B36.19 Stainless Steel Pipe Supplier in India, STANLEY ALLOYS provides premium quality seamless, welded, and ERW stainless steel pipes engineered for strength, durability, and precision. Seamless pipes are produced without weld seams, offering superior strength and dimensional accuracy for high-pressure and sensitive applications; welded pipes are manufactured from plates or coils and are cost-effective for low to medium pressure systems and structural use; while ERW pipes are produced by electric resistance welding, widely applied in water pipelines, transport, and general engineering. Governed by strict international standards, our stainless steel pipes meet IS codes for safety and quality, with options ranging from Schedule 10 lightweight pipes to Schedule 40 medium-pressure pipes, and covering ANSI/ASME B36.19 sizes from 1/8 inch to 12 inches OD. Supplied under ASTM A312 specifications, our products are recognized for consistent quality, excellent tensile strength, and outstanding corrosion resistance.

With a wide range of material grades, sizes, wall thicknesses, and pressure classes in ready stock, STANLEY ALLOYS ensures fast deliveries across India and international markets. We maintain strict compliance with ASTM, ASME, ANSI, and IS standards, and provide dedicated support for customized and project-specific requirements. Our stainless steel pipes are trusted across industries such as oil & gas pipelines, offshore drilling, petrochemical plants, power generation systems, pharmaceuticals, food processing, construction, infrastructure, and marine applications. At STANLEY ALLOYS, we go beyond supplying stainless steel pipes—we deliver reliability, value, and excellence, making us one of the most preferred suppliers in Mumbai and across India.

ASME B36.19 Stainless Steel Pipes – STANLEY ALLOYS

ASME B36.19 Stainless Steel Pipe Specifications – STANLEY ALLOYS

Overview

STANLEY ALLOYS offers a comprehensive range of ASME B36.19 Stainless Steel Pipes in various shapes including round, square, and rectangular, available in cut-to-length options at competitive prices. Our pipes meet international and European standards, ensuring high-quality, precision-engineered products for diverse industrial applications.

International & European Standards

EN 10216-5: Seamless ASME B36.19 Stainless Steel Pipe
EN 10217-7: Welded Stainless Steel Pipe
EN 10297-2: Seamless Stainless Steel Pipe
EN 10296-2 / EN10312: Welded Stainless Steel Pipe

Trade & Indian Standards

Trade Name: Stainless Steel Pipes
Indian Standard Code: IS 6913
International Standards: AISI, DIN, EN, GB, JIS, ASTM, ASME, DIN 2462, DIN EN ISO 1127
Pipe Dimensions: ANSI/ASME B36.19, B36.10

Dimensions & Sizes

Seamless Pipe OD: 6 mm up to 250 mm, up to 12” NB
Welded Pipe: 5.0 mm – 1219.2 mm
Wall Thickness: 0.3 mm – 50 mm
Available Pipe Schedules: SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 120, SCH 160, SCH XXS, SCH XS
Sizes Available:
3/8" NB to 12" NB Schedule 10S
1/8" NB to 12" NB Schedule 40S
1/8" NB to 12" NB Schedule 80S
4" NB to 8" NB Schedule 120
1/2" NB to 10" NB Schedule 160
1/2" NB to 6" NB Schedule XXS

Surface Finish & Form

Finishes: Polished, AP, BA, MF, NO.1, NO.4, 2B, BA, HL, 8K, Mirror Finish
Forms: Round, Square, Hollow, Rectangular, Hydraulic, Coiled, Straight Pipes, “U” Shape, Pan Cake Coils
Length Options: Single Random, Double Random, Standard & Cut Length
Ends: Plain End, Beveled End, Threaded

Manufacturing Techniques

Seamless, ERW, EFW, Welded, Fabricated, CDW, DOM, CEW Pipes
Marking & Identification: Grade, Standard, OD, Thickness, Length, Heat Number, or as per customer specifications

Port & Delivery

Port of Shipment: Mumbai or Kalamboli, Maharashtra, India
Delivery Time: 7–15 working days (depending on order quantity)
Payment Terms: Paypal, Western Union, T/T, L/C, or Trade Assurance – 30% deposit & balance before shipping
Free Samples: Available if in stock

Testing & Certification

JIS G3459 SS Pipe Testing Reports
EN 10204/3.1B, NACE 3.1 Certification
Mill Test Certificates, ISO 17025 testing from government-approved labs
Raw Materials Certificates
100% Radiography Test Reports
Third Party Inspection Reports as required
PMI on all procured raw materials

Applications

Petroleum & Gas Industry
Chemical Plants
Power Sector
Hardware Tools & Machinery
Metallurgy & Construction
Shipbuilding & Marine Applications

EN 10217-7 Stainless Steel Pipes

Types of EN 10217-7 Stainless Steel Pipes

Welded Stainless Steel Pipes (ERW / EFW)

Electric Resistance Welded (ERW): Pipes formed by rolling stainless steel strips and welding them longitudinally. Ideal for medium-pressure applications like fluid transport, water pipelines, and general engineering purposes.
Electric Fusion Welded (EFW): Larger-diameter pipes produced using high-frequency electric fusion welding for enhanced structural integrity. Suitable for industrial pipelines, refineries, and large-scale infrastructure.

Seamless Stainless Steel Pipes

Manufactured without welds or seams, ensuring uniform strength and mechanical stability.
Provides high dimensional accuracy, low surface roughness, and excellent resistance to high pressure and high temperature.
Commonly used in critical applications such as high-pressure steam lines, chemical reactors, and oil & gas extraction pipelines.

Rectangular & Square Stainless Steel Pipes

Engineered for structural, mechanical, and construction purposes.
Available in various sizes, wall thicknesses, and grades.
Used in building frameworks, support structures, and industrial machinery.

Custom Fabricated Stainless Steel Pipes

Includes U-bends, hydraulic shapes, pancake coils, and other project-specific forms.
Designed to meet unique industrial requirements while maintaining full compliance with EN 10217-7 standards.
Widely used in chemical processing, power plants, marine installations, and specialized manufacturing setups.

Material Grades & Finishes

Common grades: 304, 304L, 316, 316L, 321, Duplex, Super Duplex
Available finishes: Polished, Annealed & Pickled (AP), Bright & Annealed (BA), No.1, No.4, 2B, HL, 8K, Mirror finish
Ensures corrosion resistance and aesthetic appeal

Types of EN 10217-7 Stainless Steel Pipes

Technical Specifications – Stainless Steel Pipes

ASTM Specification	Title	Application Method	Tube Making	Type & Grade of Steel	Scope
ASTM A213	Seamless Ferritic & Austenitic Alloy steel boiler superheater & heat exchanger tube	Boiler, Superheater & heat exchanger tube	Seamless	Ferritic & Austenitic Stainless Steel: 405, 410, 443, 446, 304, 304L, 310, 316, 316L, 321, 347, 348	ID: ≥ 3.2 mm – OD: ≤ 101.6 mm
ASTM A249	Welded Austenitic Stainless Steel Tubes for boiler superheater, heat exchanger and condenser	Boiler, Superheater, heat exchanger and condenser tube	Automatic welding with no addition of filler metal	Austenitic Stainless Steel: 304, 304L, 316, 316L, 317, 321, 347, 348	OD: 127 mm to 813 mm
ASTM A268	Seamless & Welded ferritic Stainless Steel tubings for general service	General corrosion resisting and high temperature service	Seamless or welding with no addition of filler metal	Ferritic Stainless Steel: 405, 410, 430, 443, 446, 329, 409	ID: ≥ 6.4 mm t: ≥ 0.51 mm
ASTM A269	Seamless & Welded Austenitic Stainless Steel tubing for general service	General corrosion resisting and low or high temperature service	Seamless or welded	Austenitic Stainless Steel: 304, 304L, 316, 316L, 317, 321, 347, 348	ID: ≥ 6.4 mm t: ≥ 0.51 mm
ASTM A270	Seamless & Welded Austenitic Stainless Steel sanitary tubing for dairy & food industry	Sanitary tubing for use in dairy & food industry	Seamless or welded process	Austenitic Stainless Steel: 304	OD: 25.4 – 101.6 mm t: 1.2 – 4 mm
ASTM A270	Chromium Nickel Steel, Seamless Austenitic Steel Tubes of refinery service	Tubes for carrying fluids at elevated temperature pressure in heaters	Seamless	Austenitic Stainless Steel: 304, 304L, 321, 321H, 347, 347H	OD: 10.29 – 323.85 mm
ASTM A312	Seamless & Welded Austenitic Stainless Steel Pipe high temperature and general corrosive resisting service	High temperature and general corrosive resisting service	Seamless or automatically welded	Austenitic Stainless Steel: 304, 304L, 304H, 309, 310, 316, 316L, 317, 321, 321H, 347, 347H, 348, 348H	OD: 10.29 – 323.85 mm
ASTM A358	Welded Austenitic Stainless Steel large diameter pipes	General corrosion resisting large dia pipes	Welding with addition of filler metal	Austenitic Stainless Steel: 304, 304L, 304H, 309, 310, 316, 316L, 316H, 321, 347, 348	OD: 219.08 – 750 mm
ASTM A376	Seamless Austenitic Stainless Steel Pipe (for high temp central station service)	High Temperature Central station service	Seamless	Austenitic Stainless Steel: 304, 304L, 304H, 310, 316, 316L, 321, 321H, 347, 348	OD: 10.29 – 323.85 mm
ASTM A409	Welded Austenitic Stainless Steel Very large diameter pipes	General corrosion resisting very large dia pipe	Manual electric welding	Austenitic Stainless Steel: 304, 304L, 309, 310, 316, 316L, 317, 321, 347, 348	OD: 355.6 – 762 mm
ASTM A688	Welded Austenitic Stainless Steel Tubes for feedwater heater	Feedwater heater tubes	Automatic welding with no addition of filler metal	Austenitic Stainless Steel: 304, 304L, 316, 316L	OD: 15.9 ≥ 25.4 mm t: ≥ 0.71 & heavier

Austenitic Stainless Steel Pipes – ASTM Specifications | STANLEY ALLOYS

Austenitic Stainless Steel Pipes – ASTM Specifications

STANLEY ALLOYS offers a wide range of Austenitic Stainless Steel Pipes manufactured to international ASTM standards, designed to deliver exceptional strength, corrosion resistance, and high-temperature performance for demanding industrial applications.

ASTM A312: Covers seamless, straight-seam welded, and heavily cold-worked welded austenitic stainless steel pipes. Engineered for high-temperature applications and general corrosive service, ensuring reliability and durability in critical systems.
ASTM A358: Specifies electric-fusion-welded austenitic chromium-nickel stainless steel pipes, ideal for high-pressure and corrosive environments where precision welding and mechanical integrity are required.
ASTM A813: Defines two classes of fit-up and alignment quality for straight-seam single- or double-welded austenitic steel pipes. Suitable for high-temperature and corrosive services, offering superior dimensional accuracy and welding performance.
ASTM A814: Covers two classes of flanged and cold-bending quality, straight-seam single- or double-welded cold-worked austenitic steel pipes. Designed for high-temperature and corrosive applications, providing enhanced fabrication flexibility and structural integrity.

Lengths Available: 17" to 24" random lengths, ready for cut-to-size requirements as per project specifications.

With these ASTM-certified pipes, STANLEY ALLOYS ensures consistent quality, international standard compliance, and dependable performance across industries such as oil & gas, chemical, power, pharmaceutical, and marine sectors.

Value-Added Services – STANLEY ALLOYS

Value-Added Services for ASTM A312 & ASME B36.19 Stainless Steel Pipes – STANLEY ALLOYS

1. Polishing of Stainless Steel Pipes

High-quality polishing services for ASME B36.19 stainless steel seamless pipes, including #4, #6, #7, and #8 mirror finishes. Pipes can be cut-to-size after polishing, ready for installation.

2. Beveling for Welding Preparation

Beveling of EN 10217-7 stainless steel pipes for welding, fabrication, or mechanical assembly. Ensures accurate joint fitment and structural integrity of piping systems.

3. Honing & Turning for Precision Finishes

High-precision honing and turning to achieve near-perfect internal and external finishes, ideal for hydraulic, pharmaceutical, and food-processing pipelines.

4. Heat Treatment & Solution Annealing

Heat treatment or solution annealing to optimize strength, ductility, and corrosion resistance, especially for critical industrial applications.

5. Positive Material Identification (PMI) Testing

PMI tests to verify material compliance with customer specifications and international standards, ensuring authenticity and reliability.

6. Ready-to-Use Pipes

Delivering precision-engineered pipes ready for installation, reducing on-site preparation, saving time, and ensuring superior performance.

Stainless Steel Pipe Dimensions (ANSI B 36.19)

Stainless Steel Pipe Dimensions as per ASTM (ANSI B 36.19 - 1965)

Nominal Bore (Inch)	Nominal Bore (mm)	Outside Diameter (mm)	Sch 5S Thk (mm)	Sch 5S Wt (kg/m)	Sch 10S Thk (mm)	Sch 10S Wt (kg/m)	Sch 40S Thk (mm)	Sch 40S Wt (kg/m)	Sch 80S Thk (mm)	Sch 80S Wt (kg/m)	Sch 160S Thk (mm)	Sch 160S Wt (kg/m)	Sch XXS Thk (mm)	Sch XXS Wt (kg/m)
1/8	6	10.3	-	-	1.24	0.268	1.73	0.384	2.41	0.507	-	-	-	-
1/4	8	13.7	-	-	1.65	0.405	2.24	0.534	3.02	0.675	-	-	-	-
3/8	10	17.1	-	-	1.65	0.517	2.31	0.724	3.20	0.957	-	-	-	-
1/2	15	21.3	1.24	0.608	2.11	1.008	2.77	1.28	3.73	1.66	4.78	2.03	7.47	2.77
3/4	20	26.7	1.65	1.03	2.11	1.29	2.87	1.72	3.91	2.28	5.56	3.11	7.82	4.20
1	25	33.4	1.65	1.31	2.77	2.14	3.38	2.58	4.55	3.41	6.35	4.63	9.09	6.45
1 1/4	32	42.2	1.65	1.67	2.77	2.73	3.56	3.48	4.85	4.64	6.35	5.95	9.70	8.82
1 1/2	40	48.3	1.65	1.93	2.77	3.16	3.68	4.16	5.08	5.63	7.14	7.70	10.16	10.8
2	50	60.3	1.65	2.44	2.77	4.03	3.91	5.56	5.54	7.67	8.74	11.9	11.07	14.9
2 1/2	65	73	2.11	3.73	3.05	5.33	5.16	8.84	7.01	11.8	9.53	15.5	14.02	20.3
3	80	88.9	2.11	4.56	3.05	6.55	5.49	11.3	7.62	15.2	11.13	21.7	15.24	28.7
3 1/2	90	101.6	2.11	5.23	3.05	7.52	5.74	13.9	8.08	19.2	12.7	29.3	17.12	38.7
4	100	114.3	2.11	5.89	3.05	8.50	6.02	16.0	8.56	22.7	13.49	34.4	18.26	46.4
5	125	141.3	2.77	11.7	3.40	14.3	6.55	26.9	9.53	38.2	15.88	61.7	21.95	82.8
6	150	168.3	2.77	14.0	3.40	17.0	7.11	36.4	10.97	54.5	18.26	87.7	25.40	116
8	200	219.1	2.77	18.3	3.76	24.8	8.18	53.5	12.7	81.8	23.01	139	28.58	169
10	250	273	3.40	34.5	4.19	42.3	9.27	93.2	12.7	125	28.58	261	31.75	287
12	300	323.8	3.96	50.2	4.57	57.7	9.53	119	12.7	158	30.96	364	36.53	427
14	350	355.6	3.96	55.2	4.78	66.7	9.53	131	12.7	174	34.93	453	39.67	511
16	400	406.4	4.19	83.4	4.78	95.0	9.53	187	12.7	249	36.53	674	44.45	812
18	450	457	4.19	93.8	4.78	107	9.53	210	12.7	280	39.67	846	50.01	1046
20	500	508	4.78	118	5.54	136	9.53	234	12.7	312	44.45	1086	53.98	1304
22	550	559	-	-	5.54	150	9.53	258	12.7	344	-	-	-	-
24	600	610	5.54	181	6.35	206	9.53	282	12.7	376	50.01	1380	59.54	1655

Rectangular Stainless Steel Pipes – Sizes, Wall Thickness & Weights | STANLEY ALLOYS

Rectangular Stainless Steel Pipes – Sizes, Wall Thickness & Weights

STANLEY ALLOYS offers a comprehensive range of rectangular stainless steel pipes in various dimensions, wall thicknesses, and weights to meet industrial, construction, fabrication, and structural requirements. Manufactured with high-quality stainless steel, our rectangular pipes provide exceptional strength, durability, and corrosion resistance, making them ideal for both commercial and heavy-duty applications.

Size (mm)	Approx Weight (kg/m)	Size (mm)	Approx Weight (kg/m)	Size (mm)	Approx Weight (kg/m)
20 x 10 x 1	0.45	40 x 10 x 1.5	1.26	80 x 10 x 1.5	2.12
20 x 10 x 1.2	0.54	40 x 10 x 2	1.65	80 x 10 x 2	2.80
20 x 10 x 1.5	0.66	40 x 15 x 1	0.85	80 x 40 x 1.2	2.26
20 x 15 x 1	0.53	40 x 15 x 1.2	1.02	80 x 40 x 1.5	2.81
20 x 15 x 1.2	0.63	40 x 15 x 1.5	1.26	80 x 40 x 2	3.73
20 x 15 x 1.5	0.78	40 x 15 x 2	1.65	80 x 40 x 2.5	4.63
20 x 15 x 2	1.02	40 x 20 x 1	0.93	80 x 40 x 3	5.52
25 x 10 x 1	0.53	40 x 20 x 1.2	1.11	80 x 40 x 4	7.26
25 x 10 x 1.2	0.63	40 x 20 x 1.5	1.38	80 x 40 x 5	8.94
25 x 10 x 1.5	0.78	40 x 20 x 2	1.81	80 x 50 x 1.5	2.96
25 x 10 x 2	1.02	40 x 20 x 3	2.65	80 x 50 x 2	4.06
30 x 10 x 1	0.53	40 x 30 x 1	1.09	80 x 50 x 3	5.93
30 x 10 x 1.2	0.63	40 x 30 x 1.2	1.30	80 x 50 x 4	7.81
30 x 10 x 1.5	0.78	40 x 30 x 1.5	1.62	80 x 50 x 5	9.47
30 x 15 x 1	0.69	40 x 30 x 2	2.13	80 x 60 x 1.5	3.29
30 x 15 x 1.2	0.83	40 x 30 x 2.5	2.64	80 x 60 x 2	4.37
30 x 15 x 1.5	1.02	40 x 30 x 3	3.12	80 x 60 x 2.5	5.43
30 x 15 x 2	1.34	50 x 10 x 1.5	1.38	80 x 60 x 3	6.47
30 x 20 x 1	0.77	50 x 10 x 2	1.84	80 x 60 x 4	8.53
30 x 20 x 1.2	0.92	50 x 20 x 1	1.09	80 x 60 x 5	10.63
30 x 20 x 1.5	1.14	50 x 20 x 1.2	1.30	100 x 40 x 1.5	3.29
30 x 20 x 2	1.49	50 x 20 x 1.5	1.62	100 x 40 x 2	4.37
35 x 20 x 1	0.85	50 x 20 x 2	2.13	100 x 40 x 2.5	5.43
35 x 20 x 1.2	1.02	50 x 25 x 1.2	1.40	100 x 40 x 3	6.47
35 x 20 x 1.5	1.23	50 x 25 x 1.5	1.74	100 x 40 x 4	8.53
35 x 20 x 2	1.65	50 x 25 x 2	2.29	100 x 40 x 5	10.54
40 x 20 x 1	1.09	60 x 30 x 1.5	3.42	150 x 50 x 5	30.12
40 x 20 x 1.5	1.62	60 x 30 x 2	4.56	150 x 50 x 6	36.14
40 x 20 x 2	2.13	60 x 40 x 1.5	4.12	150 x 50 x 8	46.20
40 x 30 x 1	1.09	60 x 40 x 2	5.49	200 x 100 x 5	38.50
40 x 30 x 1.2	1.30	60 x 40 x 2.5	6.78	200 x 100 x 6	46.20
40 x 30 x 1.5	1.62	60 x 40 x 3	8.12	200 x 100 x 8	61.20
40 x 30 x 2	2.13	80 x 40 x 1.5	5.30	250 x 120 x 6	58.20
40 x 30 x 2.5	2.64	80 x 40 x 2	6.97	250 x 120 x 8	77.60
40 x 30 x 3	3.12	80 x 50 x 1.5	6.23	300 x 150 x 6	81.50
50 x 20 x 1.5	3.42	80 x 50 x 2	8.32	300 x 150 x 8	108.50
50 x 20 x 2	4.56	80 x 50 x 3	11.43	350 x 200 x 10	150.00
50 x 25 x 1.5	3.87	80 x 50 x 4	14.98	400 x 200 x 12.5	195.00

Key Features of STANLEY ALLOYS Rectangular Pipes:

High-Quality Stainless Steel: Ensures corrosion resistance, durability, and long service life.
Extensive Size Range: From small lightweight profiles to heavy-duty structural pipes.
Precision Engineering: Consistent wall thickness and dimensional accuracy for easy fabrication and installation.
Customizable Options: Pipes can be cut-to-size, polished, beveled, or fabricated according to project needs.
Applications: Ideal for construction, infrastructure, machinery, automotive, industrial fabrication, and decorative purposes.

STANLEY ALLOYS ensures that every rectangular stainless steel pipe supplied meets international quality standards, delivering strength, reliability, and long-term performance across all industries.

Austenitic Stainless Steel Square Pipes – Sizes & Weights | STANLEY ALLOYS

Austenitic Stainless Steel Square Pipes – Sizes & Weights

STANLEY ALLOYS offers a comprehensive range of premium-grade austenitic stainless steel square pipes designed for industrial, structural, mechanical, and commercial applications. These pipes are manufactured with high-quality stainless steel, ensuring excellent corrosion resistance, superior strength, and long-term durability.

Size (mm)	Approx Weight (kg/m)	Size (mm)	Approx Weight (kg/m)	Size (mm)	Approx Weight (kg/m)
12 x 12 x 1	0.36	35 x 35 x 2	2.13	100 x 100 x 3	7.43
12 x 12 x 1.2	0.42	35 x 35 x 2.5	2.64	100 x 100 x 4	12.36
12 x 12 x 1.5	0.52	35 x 35 x 3	3.12	100 x 100 x 5	15.32
15 x 15 x 1	0.45	38 x 38 x 1.2	1.42	100 x 100 x 6	18.24
15 x 15 x 1.2	0.54	38 x 38 x 1.5	1.76	100 x 100 x 8	21.60
15 x 15 x 1.5	0.66	38 x 38 x 2	2.32	100 x 100 x 10	25.80
16 x 16 x 1	0.49	40 x 40 x 1	1.25	120 x 120 x 2	7.56
16 x 16 x 1.2	0.58	40 x 40 x 1.2	1.50	120 x 120 x 2.5	9.34
16 x 16 x 1.5	0.71	40 x 40 x 1.5	1.86	120 x 120 x 3	11.26
16 x 16 x 2	0.92	40 x 40 x 2	2.45	120 x 120 x 4	14.91
20 x 20 x 1	0.61	40 x 40 x 2.5	3.03	120 x 120 x 5	18.51
20 x 20 x 1.2	0.73	40 x 40 x 3	3.60	120 x 120 x 6	22.06
20 x 20 x 1.5	0.90	40 x 40 x 4	4.70	120 x 120 x 8	26.58
20 x 20 x 2	1.18	45 x 45 x 1	1.41	120 x 120 x 10	32.37
22 x 22 x 1.5	1.00	45 x 45 x 1.2	1.69	150 x 150 x 3	14.06
25 x 25 x 1	0.77	45 x 45 x 1.5	2.10	150 x 150 x 4	18.62
25 x 25 x 1.2	0.92	45 x 45 x 2	2.77	150 x 150 x 5	22.40
25 x 25 x 1.5	1.14	45 x 45 x 2.5	3.43	150 x 150 x 6	27.36
25 x 25 x 2	1.49	45 x 45 x 3	4.08	150 x 150 x 8	34.30
25 x 25 x 2.5	1.84	45 x 45 x 4	5.34	150 x 150 x 10	41.65
25 x 25 x 3	2.17	50 x 50 x 1	1.57	150 x 150 x 12.5	50.57
30 x 30 x 1	0.93	50 x 50 x 1.2	1.88	200 x 200 x 4	24.60
30 x 30 x 1.2	1.11	50 x 50 x 1.5	2.34	200 x 200 x 5	30.80
30 x 30 x 1.5	1.38	50 x 50 x 2	3.09	200 x 200 x 6	36.90
30 x 30 x 2	1.81	50 x 50 x 2.5	3.83	200 x 200 x 8	47.25
30 x 30 x 2.5	2.24	50 x 50 x 3	4.56	200 x 200 x 10	57.60
30 x 30 x 3	2.65	50 x 50 x 4	7.35	200 x 200 x 12.5	69.83
32 x 32 x 1.2	1.19	50 x 50 x 5	8.83	220 x 220 x 6	39.60
32 x 32 x 1.5	1.47	60 x 60 x 1.5	2.81	220 x 220 x 8	51.90
34 x 34 x 1.2	1.19	60 x 60 x 2	3.73	220 x 220 x 10	63.65
34 x 34 x 1.5	1.47	60 x 60 x 2.5	4.63	220 x 220 x 12.5	77.73
35 x 35 x 1	1.09	60 x 60 x 3	5.98	250 x 250 x 5	38.40
35 x 35 x 1.2	1.30	60 x 60 x 4	7.26	250 x 250 x 6	45.70
35 x 35 x 1.5	1.62	60 x 60 x 5	8.94	250 x 250 x 8	59.45
35 x 35 x 2	2.13	70 x 70 x 1.5	2.81	250 x 250 x 10	73.50
35 x 35 x 2.5	2.64	70 x 70 x 2	3.73	250 x 250 x 12.5	89.60
35 x 35 x 3	3.12	70 x 70 x 2.5	4.63	300 x 300 x 5	46.20
38 x 38 x 1.2	1.42	70 x 70 x 3	5.98	300 x 300 x 6	55.30
38 x 38 x 1.5	1.76	70 x 70 x 4	7.26	300 x 300 x 8	72.80
38 x 38 x 2	2.32	70 x 70 x 5	8.94	300 x 300 x 10	89.90
40 x 40 x 1	1.25	80 x 80 x 1.5	3.77	300 x 300 x 12.5	109.35
40 x 40 x 1.2	1.50	80 x 80 x 2	5.00	-	-
40 x 40 x 1.5	1.86	80 x 80 x 2.5	6.22	-	-
40 x 40 x 2	2.45	80 x 80 x 3	6.47	-	-
40 x 40 x 2.5	3.03	80 x 80 x 4	9.81	-	-
40 x 40 x 3	3.60	80 x 80 x 5	12.13	-	-
40 x 40 x 4	4.70	80 x 80 x 6	14.41	-	-

Key Features of STANLEY ALLOYS Austenitic Square Pipes:

Premium Quality Stainless Steel: High-grade austenitic stainless steel with excellent corrosion resistance and mechanical strength.
Extensive Size Range: From small structural pipes (12 x 12 mm) to large heavy-duty pipes (300 x 300 mm).
Precision Manufacturing: Maintains uniform wall thickness, accurate dimensions, and consistent weight per meter.
Versatile Applications: Suitable for industrial, mechanical, fabrication, architectural, and decorative uses.
Customizable Options: Available for cut-to-length, polished, beveled, or fabricated requirements.
International Standards Compliance: Pipes conform to ASTM and EN standards, ensuring reliability for global projects.

STANLEY ALLOYS ensures that every austenitic stainless steel square pipe supplied meets international quality standards, delivering strength, reliability, and long-term performance across all industries.

ASME SA 312 Stainless Steel Pipe – Working Pressure Chart | Stanley Alloys

ASME SA 312 Stainless Steel Pipe – Working Pressure Chart

Ferritic Stainless Steel Pipe – Mechanical Properties

Pipe Size (inches)	Schedule	Temperature (°F)	100	200	300	400	500	600	650	700	750
1"	40	Working Pressure	3048	2629	2362	2171	2019	1924	1867	1824	1810
1"	80	Working Pressure	4213	3634	3265	3002	2791	2659	2580	2528	2501
1"	160	Working Pressure	6140	5296	4759	4375	4068	3876	3761	3684	3646
1 1/2"	40	Working Pressure	2257	1947	1750	1608	1496	1425	1383	1354	1340
1 1/2"	80	Working Pressure	3182	2744	2466	2267	2108	2009	1949	1909	1889
1 1/2"	160	Working Pressure	4619	3984	3580	3291	3060	2916	2829	2772	2743
2"	40	Working Pressure	1902	1640	1474	1355	1260	1201	1165	1141	1129
2"	80	Working Pressure	2747	2369	2129	1957	1820	1734	1682	1648	1631
2"	160	Working Pressure	4499	3880	3486	3205	2980	2840	2755	2699	2671
3"	40	Working Pressure	1806	1558	1400	1287	1196	1140	1106	1084	1072
3"	80	Working Pressure	2553	2202	1979	1819	1691	1612	1564	1532	1516
3"	160	Working Pressure	3840	3312	2976	2736	2544	2424	2352	2304	2280
4"	40	Working Pressure	1531	1321	1187	1091	1014	967	938	919	909
4"	80	Working Pressure	2213	1909	1715	1577	1466	1397	1355	1328	1314
4"	160	Working Pressure	3601	3106	2791	2566	2386	2273	2206	2161	2138
5"	40	Working Pressure	1342	1158	1040	956	889	847	822	805	797
5"	80	Working Pressure	1981	1709	1535	1411	1312	1250	1213	1189	1176
5"	160	Working Pressure	3414	2945	2646	2433	2262	2155	2091	2049	2027
6"	40	Working Pressure	1219	1052	945	869	808	770	747	732	724
6"	80	Working Pressure	1913	1650	1483	1363	1267	1208	1172	1148	1136
6"	160	Working Pressure	3289	2836	2549	2343	2179	2076	2014	1973	1953
8"	40	Working Pressure	1073	926	832	765	711	678	657	644	637
8"	80	Working Pressure	1692	1459	1311	1205	1121	1068	1036	1015	1005
8"	160	Working Pressure	3175	2738	2460	2262	2103	2004	1944	1905	1885
10"	40	Working Pressure	974	840	755	694	645	615	596	584	578
10"	80	Working Pressure	1609	1388	1247	1147	1066	1016	986	966	956
10"	160	Working Pressure	3147	2714	2439	2242	2085	1986	1927	1880	1868

Grade	Tensile Strength (Ultimate)	Yield Strength (0.2% Min)	Elongation (Min)
316	75 KSI / 515 MPa	30 KSI	30%
316L	70 KSI / 485 MPa	25 KSI	25%

Notes:
316L has slightly lower tensile and yield strength than 316 but offers better corrosion resistance in harsh environments.
Elongation values indicate ductility and the ability to withstand deformation before failure.

SS ASTM A312 Seamless Pipe Equivalent Grades

Material Type	UNS	ASTM Grade (TP)	DIN (EN)	AFNOR (NF)	Japan (JIS)
Austenitic Stainless Steel	S30400	304	1.4301	Z6CN18-09	SUS304
	S30403	304L	1.4307	Z2CN18-10	SUS304L
	S31600	316	1.4401	Z6CND17-11	SUS316
	S31603	316L	1.4404	Z2CND17-12	SUS316L
	S31635	316Ti	1.4571	Z2CND17-12	-
	S32100	321	1.4541	Z6CNT18-10	SUS321
	S34700	347	1.455	Z6CNNb18-10	SUS347
	S30409	304H	1.4948	Z6CN19-10	SUS304H
	S31609	316H	1.4919	Z6CND17-12	SUS316H
	S32109	321H	1.4941	Z10CND18-10	SUS321H
	S31000	310	-	-	SUS310
	S31703	317L	1.4438	-	SUS317L
Ferritic Stainless Steel	S40500	405	1.4002	Z6CAL13	SUS405
	S41000	410	1.4006	Z12C13	SUS410
	S43000	430	1.4016	Z10C17	SUS430
Duplex Stainless Steel	S32205	2205	1.4462	Z2CND22-06	-
Duplex Stainless Steel	S31803	-	1.4462	Z2CND22-05	-

Advantages of Seamless Stainless Steel Pipes

High Strength and Durability – No welds, making them less prone to leaks or weaknesses under pressure.
Corrosion Resistance – Ideal for harsh chemical, saline, and industrial environments due to high chromium and nickel content.
High-Temperature Resistance – Suitable for heat exchangers, boilers, and high-temperature pipelines.
Precision and Uniformity – Uniform wall thickness ensures consistent performance and reliability.
Versatile Application – Used for fluid transport, structural purposes, and high-precision industrial systems.

Manufacturing Processes & Quality Assurance

Manufacturing Processes

Hot Rolling (Extrusion Method) – A solid billet is heated and pushed through a die to form a hollow pipe.
Cold Drawing – Provides tighter tolerances and smoother surface finish by pulling the pipe through a die.
Heat Treatment – Annealing or solution treatment enhances corrosion resistance and mechanical properties.
Pickling & Polishing – Removes scale and impurities, providing a polished, clean, and smooth finish.

Testing & Quality Assurance

Hydrostatic Pressure Test – Ensures leak-free performance.
Chemical Composition Test – Confirms alloy grade compliance.
Mechanical Testing – Includes tensile, yield, and elongation tests.
NDT & Radiography – Detects internal flaws without damaging the pipe.
Third-Party Certification – EN 10204, ISO 9001, and customer-specific standards.

Stainless Steel Seamless Pipes FAQ

FAQs on Stainless Steel Seamless Pipes

1. What are stainless steel seamless pipes?

Stainless steel seamless pipes are hollow tubes manufactured without any welded seam. They offer high strength, uniform thickness, and superior corrosion resistance, making them suitable for high-pressure and high-temperature applications.

2. What is the difference between seamless and welded stainless steel pipes?

Seamless pipes are made from a solid billet and have no weld seam, ensuring uniform strength and better pressure tolerance. Welded pipes are formed from steel sheets or strips and joined by welding, which may have slightly lower pressure resistance.

3. What grades of stainless steel are available for seamless pipes?

Common grades include Austenitic (304, 304L, 316, 316L), Ferritic (409, 430), Duplex (2205, 2507), and Super Duplex, each suited for different corrosion and temperature requirements.

4. What industries use stainless steel seamless pipes?

They are widely used in petrochemical, chemical, power, oil & gas, marine, food processing, pharmaceuticals, and construction industries due to their strength, durability, and corrosion resistance.

5. What are the standard sizes and schedules available?

Sizes range from small-diameter precision tubing (e.g., 6 mm OD) to large industrial pipes (up to 600 mm OD or more). Schedules typically include SCH 5, 10, 40, 80, 160, XXS, and custom schedules depending on application.

6. Can stainless steel seamless pipes withstand high temperatures?

Yes. Austenitic and duplex grades, like 316 or 2205, can withstand temperatures up to 800°C in industrial applications, making them ideal for boilers, heat exchangers, and chemical processing.

7. What surface finishes are offered on seamless pipes?

Common finishes include Mill Finish, Polished (#4, #6, #8K Mirror), Bright Annealed (BA), and Annealed & Pickled (AP), tailored for hygiene, aesthetics, or corrosion resistance.

8. Are stainless steel seamless pipes tested for quality?

Yes. Pipes undergo hydrostatic testing, chemical analysis, mechanical testing, NDT & radiography, and come with third-party certifications like ISO, EN 10204/3.1, or NACE.

9. Can these pipes be customized?

Absolutely. Stanley Alloys offers value-added services such as cut-to-length, beveling, polishing, heat treatment, and PMI testing to meet specific project requirements.

10. Why choose Stanley Alloys stainless steel seamless pipes?

Stanley Alloys provides high-quality pipes sourced from trusted mills in Japan, Europe, Korea, and India. We ensure precision, compliance with ASTM/ASME/DIN standards, a wide size range, and tailored solutions for all industrial applications.