Stainless Welded Pipe

Hunan Great Steel Pipe Co., Ltd
stainless steel welded pipe,welded stainless pipe,ASTM A312 welded pipe,ASTM A358 EFW pipe,304 welded stainless pipe,316L welded pipe,ERW stainless pipe,stainless steel welded tube,large diameter stainless welded pipe,TP304 welded pipe,TP316L welded pipe

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Stainless Welded Pipe

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Keywords

Stainless Steel Welded Pipe,ERW Stainless Steel Welded Pipe,304 Welded Stainless Steel Pipe,ASTM A358 Welded Stainless Pipe

Size Range

Outside Diameter: 1/8" ~ 48"

Wall Thickness: SCH5, SCH10, SCH40, SCH80, SCH160, SCHXXH

Length: 3.0m – 18m

Standards

ASTM Standards: ASTM A358,ASTM A778,ASTM A409,ASTM A688,ASTM A814,ASTM A269,ASTM A268,ASTM A789,ASTM A632,ASTM A250

European Standards: EN 10216,EN 10297

Japanese Standards: JIS G3448,JIS G3459,JIS G3463

Material Grades

300 Series Austenitic Stainless Steel 301,302,304,304L,304H,304Cu,303,303Se,305,307,308,308L,309,309S,309H,310,310S,310H,316,316L,317L,321,321H,347,347H

400 Series Ferritic & Martensitic Stainless Steel 409,410,410S,420,420J2,430,430S,431,439,441,444,446,440A,440B,440C

Duplex, Super Austenitic & Precipitation Hardening Alloys 2205 (S32205/F51),2507,S31803,904L,S31254 (254SMO),330,660,630 (17-4PH),631 (17-7PH)

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  • Introduction
  • Specs & Sizes
  • Process & Finishing
  • Test & QC
  • FAQ

Introduction

Stainless steel welded pipe is a high cost-performance industrial piping solution manufactured by strip rolling and precision welding. Featuring high production efficiency, full specification coverage and stable quality, it is widely adopted for medium and low-pressure fluid transmission scenarios, serving as an economical and reliable alternative to seamless steel pipes.
Our stainless steel welded tubing delivers excellent corrosion resistance, high-temperature stability and great ductility, requiring minimal maintenance for long-term service in harsh environments. We supply complete material grades including austenitic, ferritic, martensitic and duplex stainless steel, covering chemical, food, pharmaceutical, oil & gas, power generation and marine industrial piping applications.


Product Name

Executive Standard

Dimension

Steel Code / Steel Grade

Industrial Pipes

 

ASTM A312, A358, A778, JIS G3459

 

OD: 1/4"~40"

TP304, TP304L, TP316L, SUS304TP

 

WT: SCH5S~SCH80S

Tubes for Boiler and Heat-Exchanger,
General Service Tubing

 

ASTM A249, A269, JIS G3463

 

OD: 15.9~139.8mm

TP304, TP304L, TP316L, SUS304TB

 

WT: 1.6~5.0mm

Mechanical and Structural Tubes

 

ASTM A554, JIS G3446

 

OD: 7.9~152.4mm

MT304, MT304L, MT316L, MT430 Grade 201, 202
as per mill's STD SUS304

 

WT: 0.5~6.5mm

Square Tubes

 

ASTM A554

 

OD: 12.7x12.7~150x150mm

MT304, MT304L, MT316L, MT430 Grade 201, 202
as per mill's STD

 

WT: 0.7~6.5mm

Rectangular Tubes

 

ASTM A554

 

OD: 10x20~100x200mm

MT304, MT304L, MT316L, MT430 Grade 201, 202
as per mill's STD

 

WT: 0.7~6.5mm

Sanitary Tubing

 

ASTM A270

OD: 25.4~165.2mm

TP304, TP304L, TP316L, SUS304TBS

 

JIS G3447

WT: 0.8~3.05mm

Large Gauge Pipes for Ordinary
Piping

 

JIS G3448

 

OD: 15.88~318.5mm

SUS304TPD

 

WT: 0.8~3.0mm

Large Diameter Pipes

 

JIS G3468

 

OD: 14"~40"

SUS304TPY

 

WT: SCH5S~SCH40S


Specs & Sizes

Our stainless steel welded pipes comply with standard industrial dimensional tolerance requirements, covering outer diameter, wall thickness, straightness and pipe length to ensure high installation compatibility and dimensional consistency.

Strict tolerance control effectively eliminates dimensional deviation, guarantees precise fitting for piping assembly, and maintains stable structural performance under various operating conditions. All tolerance standards fully match ASTM and EN specifications, meeting general and high-precision industrial piping project requirements.


NPS Designator

Permissible Variations in Outside Diameter


Over In.

Under In.

1/8 to 1-1/2, incl

1/64 (0.015)

1/32 (0.031)

Over 1-1/2 to 4, incl

1/32 (0.031)

1/32 (0.031)

Over 4 to 8, incl

1/16 (0.062)

1/32 (0.031)

Over 8 to 18, incl

3/23 (0.093)

1/32 (0.031)



Outside Diameter
NPS

Outside Diameter
(mm)

Nominal Wall Thickness (mm)

ASME B36.19M

ASME B36.10M

SCH 5S

SCH 10S

SCH 40S

SCH 80S

SCH 5

SCH 10

SCH 20

STD

XS

1/4

13.72

—

1.65

2.24

3.02


1.65

—

2.24

3.02

3/8

17.15

—

1.65

2.31

3.2


1.65

—

2.31

3.2

1/2

21.34

1.65

2.11

2.77

3.73

1.65

2.11

—

2.77

3.73

3/4

26.67

1.65

2.11

2.87

3.91

1.65

2.11

—

2.87

3.91

1

33.4

1.65

2.77

3.38

4.55

1.65

2.77

—

3.38

4.55

1 1/4

42.16

1.65

2.77

3.56

4.85

1.65

2.77

—

3.56

4.85

1 1/2

48.26

1.65

2.77

3.68

5.08

1.65

2.77

—

3.68

5.08

2

60.33

1.65

2.77

3.91

5.54

1.65

2.77

—

3.91

5.54

2 1/2

73.03

2.11

3.05

5.16

7.01

2.11

3.05

—

5.16

7.01

3

88.9

2.11

3.05

5.49

7.62

2.11

3.05

—

5.49

7.62

3 1/2

101.6

2.11

3.05

5.74

8.08

2.11

3.05

—

5.74

8.08

4

114.3

2.11

3.05

6.02

8.56

2.11

3.05

—

6.02

8.56

5

141.3

2.77

3.4

6.55

9.53

2.77

3.4

—

6.55

9.53

6

168.28

2.77

3.4

7.11

10.97

2.77

3.4

—

7.11

10.97

8

219.08

2.77

3.76

8.18

12.7

2.77

3.76

6.35

8.18

12.7

10

273.05

3.4

4.19

9.27

12.7

3.4

4.19

6.35

9.27

12.7

12

323.85

3.96

4.57

9.53

12.7

3.96

4.57

6.35

9.53

12.7

14

355.6

3.96

4.78

9.53

12.7

3.96

6.35

7.92

9.53

12.7

16

406.4

4.19

4.78

9.53

12.7

4.19

6.35

7.92

9.53

12.7

18

457.2

4.19

4.78

9.53

12.7

4.19

6.35

7.92

9.53

12.7

20

508

4.78

5.54

9.53

12.7

4.78

6.35

9.53

9.53

12.7

22

558.8

4.78

5.54



4.78

6.35

9.53

9.53

12.7

24

609.6

5.54

6.35

9.53

12.7

5.54

6.35

9.53

9.53

12.7

26

660.4

—

—

—

—

—

7.92

12.7

9.53

12.7

28

711.2

—

—

—

—

—

7.92

12.7

9.53

12.7

30

762

6.35

7.92

—

6.35

—

7.92

12.7

9.53

12.7

32

812.8

Thinkness: 8.63-30mm

Process & Finishing

The standardized production of stainless steel welded pipes follows a complete, rigorous process flow to ensure stable product quality, accurate dimensions and reliable service performance. 

stainless-welded-pipe-processing

To adapt to conventional market demands and control costs, most manufacturers simplify basic processes for ordinary-grade welded pipes used in conventional low-pressure fluid transmission scenarios, appropriately omitting pickling, non-destructive flaw detection and hydrostatic testing procedures. For projects requiring high safety, high precision and suitability for harsh working environments, all standard inspection and treatment processes can be customized and supplemented to meet special industrial application requirements, with adjusted specifications and prices accordingly.

Test & QC

We conduct comprehensive standardized testing for stainless steel welded pipes to ensure stable mechanical performance, accurate dimensions and zero internal or external defects. Our full test scope covers chemical composition analysis, mechanical property tests (tensile strength, yield strength, elongation), and technical performance tests including flattening, bending, blow and impact tests. We also complete strict exterior dimension inspection, hydrostatic pressure testing and professional X-ray nondestructive testing to meet international quality standards.All products are available with authoritative mill test certificates (EN 10204 3.1 & EN 10204 3.2). Third-party inspection by SGS, BV, Lloyds and other reputable institutions is supported on request, delivering fully verified, traceable quality for global industrial projects.

FAQ

Q1: What are the core advantages of stainless steel welded pipe?

A1: Stainless steel welded pipe is a high cost-performance piping alternative to seamless pipe. It boasts high dimensional accuracy, excellent corrosion resistance, good structural durability and a neat surface appearance. Featuring rich specifications and flexible production, it perfectly meets most standard industrial piping needs and effectively reduces overall project costs.

Q2: What are the main types of stainless steel welded pipes?

A2: Based on weld seam structure, stainless steel welded pipes are mainly divided into straight seam welded pipes and spiral welded pipes. Straight seam welded pipes have simple processes, high production efficiency and low cost, suitable for various small-diameter piping systems. Spiral welded pipes feature higher structural strength and wider raw material adaptability, which are widely used for large-diameter and medium-pressure pipeline projects.

Q3: What is the difference and development trend between welded pipe and seamless pipe?

A3: Compared with stainless steel seamless pipes, welded pipes have simpler production processes, richer specifications and lower manufacturing costs, though their extreme structural strength is slightly lower. With continuous advancements in welding and finishing technology, the overall quality and operational stability of welded pipes have been greatly improved, gradually replacing seamless pipes in most medium and low-pressure industrial application scenarios.

Q4: What are the common low-pressure fluid transmission applications?

A4: Stainless steel welded pipes are widely used for conventional low-pressure fluid transmission. They are applicable for conveying water, gas, air, heating steam and hot water. With optional ordinary or thickened wall thickness and threaded or non-threaded pipe end designs, they fully adapt to building plumbing, heating and general industrial utility piping systems.

Q5: What are the professional industrial application scenarios for welded stainless pipes?

A5: Welded stainless steel pipes cover diversified professional industrial scenarios. Straight seam welded pipes are commonly used for electrical wire protection casings, thin-walled piping and transformer cooling pipelines. High-strength spiral welded pipes are ideal for medium-pressure fluid transmission and large infrastructure construction, including bridge and dock pile foundation projects, providing stable and cost-effective industrial piping solutions.

Our stainless steel welded pipes comply with standard industrial dimensional tolerance requirements, covering outer diameter, wall thickness, straightness and pipe length to ensure high installation compatibility and dimensional consistency.

Strict tolerance control effectively eliminates dimensional deviation, guarantees precise fitting for piping assembly, and maintains stable structural performance under various operating conditions. All tolerance standards fully match ASTM and EN specifications, meeting general and high-precision industrial piping project requirements.


NPS Designator

Permissible Variations in Outside Diameter


Over In.

Under In.

1/8 to 1-1/2, incl

1/64 (0.015)

1/32 (0.031)

Over 1-1/2 to 4, incl

1/32 (0.031)

1/32 (0.031)

Over 4 to 8, incl

1/16 (0.062)

1/32 (0.031)

Over 8 to 18, incl

3/23 (0.093)

1/32 (0.031)



Outside Diameter
NPS

Outside Diameter
(mm)

Nominal Wall Thickness (mm)

ASME B36.19M

ASME B36.10M

SCH 5S

SCH 10S

SCH 40S

SCH 80S

SCH 5

SCH 10

SCH 20

STD

XS

1/4

13.72

—

1.65

2.24

3.02


1.65

—

2.24

3.02

3/8

17.15

—

1.65

2.31

3.2


1.65

—

2.31

3.2

1/2

21.34

1.65

2.11

2.77

3.73

1.65

2.11

—

2.77

3.73

3/4

26.67

1.65

2.11

2.87

3.91

1.65

2.11

—

2.87

3.91

1

33.4

1.65

2.77

3.38

4.55

1.65

2.77

—

3.38

4.55

1 1/4

42.16

1.65

2.77

3.56

4.85

1.65

2.77

—

3.56

4.85

1 1/2

48.26

1.65

2.77

3.68

5.08

1.65

2.77

—

3.68

5.08

2

60.33

1.65

2.77

3.91

5.54

1.65

2.77

—

3.91

5.54

2 1/2

73.03

2.11

3.05

5.16

7.01

2.11

3.05

—

5.16

7.01

3

88.9

2.11

3.05

5.49

7.62

2.11

3.05

—

5.49

7.62

3 1/2

101.6

2.11

3.05

5.74

8.08

2.11

3.05

—

5.74

8.08

4

114.3

2.11

3.05

6.02

8.56

2.11

3.05

—

6.02

8.56

5

141.3

2.77

3.4

6.55

9.53

2.77

3.4

—

6.55

9.53

6

168.28

2.77

3.4

7.11

10.97

2.77

3.4

—

7.11

10.97

8

219.08

2.77

3.76

8.18

12.7

2.77

3.76

6.35

8.18

12.7

10

273.05

3.4

4.19

9.27

12.7

3.4

4.19

6.35

9.27

12.7

12

323.85

3.96

4.57

9.53

12.7

3.96

4.57

6.35

9.53

12.7

14

355.6

3.96

4.78

9.53

12.7

3.96

6.35

7.92

9.53

12.7

16

406.4

4.19

4.78

9.53

12.7

4.19

6.35

7.92

9.53

12.7

18

457.2

4.19

4.78

9.53

12.7

4.19

6.35

7.92

9.53

12.7

20

508

4.78

5.54

9.53

12.7

4.78

6.35

9.53

9.53

12.7

22

558.8

4.78

5.54



4.78

6.35

9.53

9.53

12.7

24

609.6

5.54

6.35

9.53

12.7

5.54

6.35

9.53

9.53

12.7

26

660.4

—

—

—

—

—

7.92

12.7

9.53

12.7

28

711.2

—

—

—

—

—

7.92

12.7

9.53

12.7

30

762

6.35

7.92

—

6.35

—

7.92

12.7

9.53

12.7

32

812.8

Thinkness: 8.63-30mm

The standardized production of stainless steel welded pipes follows a complete, rigorous process flow to ensure stable product quality, accurate dimensions and reliable service performance. 

stainless-welded-pipe-processing

To adapt to conventional market demands and control costs, most manufacturers simplify basic processes for ordinary-grade welded pipes used in conventional low-pressure fluid transmission scenarios, appropriately omitting pickling, non-destructive flaw detection and hydrostatic testing procedures. For projects requiring high safety, high precision and suitability for harsh working environments, all standard inspection and treatment processes can be customized and supplemented to meet special industrial application requirements, with adjusted specifications and prices accordingly.

We conduct comprehensive standardized testing for stainless steel welded pipes to ensure stable mechanical performance, accurate dimensions and zero internal or external defects. Our full test scope covers chemical composition analysis, mechanical property tests (tensile strength, yield strength, elongation), and technical performance tests including flattening, bending, blow and impact tests. We also complete strict exterior dimension inspection, hydrostatic pressure testing and professional X-ray nondestructive testing to meet international quality standards.All products are available with authoritative mill test certificates (EN 10204 3.1 & EN 10204 3.2). Third-party inspection by SGS, BV, Lloyds and other reputable institutions is supported on request, delivering fully verified, traceable quality for global industrial projects.

Q1: What are the core advantages of stainless steel welded pipe?

A1: Stainless steel welded pipe is a high cost-performance piping alternative to seamless pipe. It boasts high dimensional accuracy, excellent corrosion resistance, good structural durability and a neat surface appearance. Featuring rich specifications and flexible production, it perfectly meets most standard industrial piping needs and effectively reduces overall project costs.

Q2: What are the main types of stainless steel welded pipes?

A2: Based on weld seam structure, stainless steel welded pipes are mainly divided into straight seam welded pipes and spiral welded pipes. Straight seam welded pipes have simple processes, high production efficiency and low cost, suitable for various small-diameter piping systems. Spiral welded pipes feature higher structural strength and wider raw material adaptability, which are widely used for large-diameter and medium-pressure pipeline projects.

Q3: What is the difference and development trend between welded pipe and seamless pipe?

A3: Compared with stainless steel seamless pipes, welded pipes have simpler production processes, richer specifications and lower manufacturing costs, though their extreme structural strength is slightly lower. With continuous advancements in welding and finishing technology, the overall quality and operational stability of welded pipes have been greatly improved, gradually replacing seamless pipes in most medium and low-pressure industrial application scenarios.

Q4: What are the common low-pressure fluid transmission applications?

A4: Stainless steel welded pipes are widely used for conventional low-pressure fluid transmission. They are applicable for conveying water, gas, air, heating steam and hot water. With optional ordinary or thickened wall thickness and threaded or non-threaded pipe end designs, they fully adapt to building plumbing, heating and general industrial utility piping systems.

Q5: What are the professional industrial application scenarios for welded stainless pipes?

A5: Welded stainless steel pipes cover diversified professional industrial scenarios. Straight seam welded pipes are commonly used for electrical wire protection casings, thin-walled piping and transformer cooling pipelines. High-strength spiral welded pipes are ideal for medium-pressure fluid transmission and large infrastructure construction, including bridge and dock pile foundation projects, providing stable and cost-effective industrial piping solutions.

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  • Tags : stainless steel welded pipe , welded stainless pipe , ASTM A312 welded pipe , ASTM A358 EFW pipe , 304 welded stainless pipe , 316L welded pipe , ERW stainless pipe , stainless steel welded tube , large diameter stainless welded pipe , TP304 welded pipe , TP316L welded pipe

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