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Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
Stainless Welded Steel Pipe
  • Keywords: Stainless Steel Welded tube, EFW Steel Pipe, Stainless Steel LSAW pipe, Stainless Steel Seam Pipe, Stainless Steel SSAW Pipe
  • Standards: ASTM A312/A358, ASME SA312/SA358, DIN EN 10216-5, JIS G3459
  • Dimensions: ASTM, ASME and API
  • Standard: JIS, AISI, ASTM, GB, DIN, EN
  • Surface: Brushed, Mill Finished, Anodized, Sand Blasted, Finished Polished
  • Form: Round, Square, Rectangular, Hydraulic, Oval
  • Length: Single Random, Double Random & Cut Length

Whats is the Stainless Welded Steel Pipe?

Stainless steel welded pipe is a hollow tubular product manufactured by forming a flat stainless steel strip or plate into a cylindrical shape and joining the edges by welding. Unlike a seamless pipe, it has a longitudinal or spiral weld seam along its length. Key welding processes employed include EFW (Electric Fusion Welding), often used for larger diameter pipes; TIG (Tungsten Inert Gas) welding, favored for high-purity applications and superior weld aesthetics; and Laser welding, which provides precise, narrow welds ideal for thin-walled tubing. These techniques ensure strong, durable weld seams with properties that often approach those of the base material. While seamless tubes are preferred for extremely high-pressure applications, stainless steel welded pipe offers excellent dimensional accuracy, superior surface finishes, and often a more cost-effective solution for a vast array of uses.


Key Features of Stainless Welded Steel Pipe

PropertyBrief Description
Cost Effectiveness20-30% cheaper than seamless pipe, suitable for large-scale, budget-limited projects
Size FlexibilityDiameter up to 48″+ , which is difficult for seamless pipe to achieve
Uniform Wall ThicknessConsistent wall thickness, smooth inner surface, low fluid resistance
Thin-Wall CapabilityEasy to produce thin-wall pipes, saving material and reducing weight
Corrosion ResistanceChromium content provides good rust and chemical corrosion resistance
Smooth SurfaceSmooth inner surface, easy to clean, suitable for sanitary applications

Main Classification of Stainless Welded Steel Pipe

Classification BasisTypes
Weld FormLongitudinal (Straight Seam) Welded Pipe, Spiral Welded Pipe
Material GradeAustenitic (304/316), Ferritic (430), Duplex (2205)
Surface TreatmentPolished (Mirror Finish), Matte (Satin Finish), Pickled, Annealed
Cross-Sectional ShapeRound, Square, Rectangular, Special Shapes


Manufacturing Method of Stainless Welded Steel Pipe

MethodDescriptionTypical Application
Continuous Forming (Small Diameter)Pipe diameter below φ219mm; uses single gun, multi-gun, or plasma/TIG composite welding Small-diameter, thin-wall pipes
UOE Method (Large Diameter)Pipe diameter φ219-φ1200mm; wall thickness 4-14mm; uses plasma, TIG, or submerged arc welding (SAW) Large-diameter, thick-wall pipes
ERW (Electric Resistance Welding)High-frequency welding for smaller diameter pipes General purpose, structural
TIG WeldingTungsten inert gas welding for high-quality, clean welds Sanitary, food-grade applications
Submerged Arc Welding (SAW)For larger-diameter pipes; provides deep penetration Heavy-wall, large-diameter pipes
Plasma WeldingEnergy-concentrated process; strong penetration (3-8mm without groove) Medium to thick-wall pipes


Chemical Composition of Stainless Welded Steel Pipe

Grade

UNS No.

Carbon

Manganese

Phosphorus

Sulfur

Silicon

Chromium

Nickel

Molybdenum

TP304

S30400

0.08

2.00

0.045

0.030

1.00

18.0–20.0

8.0–11.0

—

TP304L

S30403

0.035

2.00

0.045

0.030

1.00

18.0–20.0

8.0–13.0

—

TP316

S31600

0.08

2.00

0.045

0.030

1.00

16.0–18.0

11.0–14.0

2.0–3.0

TP316L

S31603

0.035

2.00

0.045

0.030

1.00

16.0–18.0

10.0–14.0

2.0–3.0


Mechanical Properties Stainless Steels Welded Pipes

Property

304L (Typical Min)

316L (Typical Min)

Tensile Strength

70 ksi (485 MPa)

70 ksi (485 MPa)

Yield Strength

25 ksi (170 MPa)

25 ksi (170 MPa)

Elongation (in 2")

40%

40%

Hardness

Rockwell B 90 / Brinell 187

Rockwell B 90 / Brinell 187


Specification of Stainless Welded Steel Pipe

NPS

OD (mm)

Sch 40S WT (mm)

Sch 40S Weight (kg/m)

Sch 80S WT (mm)

Sch 80S Weight (kg/m)

1/2"

21.3

2.77

1.29

3.73

1.65

3/4"

26.7

2.87

1.71

3.91

2.23

1"

33.4

3.38

2.54

4.55

3.29

1½"

48.3

3.68

4.11

5.08

5.49

2"

60.3

3.91

5.52

5.54

7.60

3"

88.9

5.49

11.47

7.62

15.51

4"

114.3

6.02

16.32

8.56

22.67

6"

168.3

7.11

28.69

10.97

43.21

8"

219.1

8.18

43.20

12.70

65.63

10"

273.0

9.27

61.16

15.09

97.72

12"

323.8

9.53

74.62

17.48

134.15

16"

406.4

9.53

94.55

16.66

163.60

20"

508.0

9.53

118.66

19.05

234.30

24"

609.6

9.53

142.67

20.62

303.88


Manufacturing of Stainless Welded Steel Pipe

EFW (Electric Fusion Welding) — strip or plate is formed and seam-welded, then heat-treated and tested per ASTM A312/A358.


Application of Stainless Welded Steel Pipe

  • Architectural & Ornamental.

  • Food & Beverage Processing.

  • Pharmaceutical & Biotechnology.

  • Automotive.

  • Chemical & Petrochemical.

  • Water Treatment & Distribution.

  • Heat Exchangers & Condensers.

  • Structural Applications.

  • General Industrial Fabrication.


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