Stainless Steel Welded Pipe

Stainless steel welded pipes are manufactured by rolling stainless steel plates or strips into a tubular shape and joining the edges through welding, typically using TIG (Tungsten Inert Gas), ERW (Electric Resistance Welding), or laser welding methods. After welding, the inner and outer welds are polished or ground to ensure smoothness and uniform wall thickness.
Compared with seamless pipes, welded pipes offer a cost-effective solution, consistent wall thickness, and greater availability in large diameters. They are extensively used in low- to medium-pressure liquid and gas transport, decorative structural work, architectural applications, and in industries such as food processing, pharmaceuticals, petrochemicals, and marine engineering.
Advantages include excellent corrosion resistance, aesthetic finish, ease of fabrication, and the possibility of very large diameters with relatively thin walls.
PRODUCTS INTRODUCTION

Decorative Welded Stainless Steel Pipe


Specifications:

  • Grade: ASTM A554 Type 304

  • Outer Diameter Range: 10 mm – 168 mm

  • Wall Thickness: 0.5 mm – 6.0 mm

  • Length: 1 m – 12 m (custom cut available)

  • Manufacturing Standard: ASTM A554, JIS G3446

  • Manufacturing Process: Cold-rolled strip → Forming → TIG welding → Bead removal → Polishing → Straightening → Inspection

  • Surface Finish: Mirror polish (600#), hairline, satin, or brushed

  • Weld Method: TIG welded with argon shielding gas

  • End Finish: Plain, beveled, or threaded ends

  • Applications: Interior/exterior decorative columns, furniture frames, handrails, exhibition stands, architectural accents, curtain wall supports


Mechanical Properties:


Property

Value

Test Standard

Tensile Strength

≥ 515 MPa

ASTM A370

Yield Strength

≥ 205 MPa

ASTM A370

Elongation

≥ 40%

ASTM A370

Hardness (HRB)

≤ 90

ASTM E18


Chemical Composition (%):


Element

Content

C

≤ 0.08

Mn

≤ 2.00

Si

≤ 1.00

P

≤ 0.045

S

≤ 0.030

Cr

18.00–20.00

Ni

8.00–10.50


Industrial Welded Stainless Steel Pipe


Specifications:

  • Grade: ASTM A312 / A778 Type 316L

  • Outer Diameter Range: 19.05 mm – 610 mm

  • Wall Thickness: 1.0 mm – 20 mm

  • Length: Up to 12 m

  • Manufacturing Standard: ASTM A312, ASME SA312, DIN EN 10217-7

  • Manufacturing Process: Hot-rolled plate → Forming → GTAW or ERW welding → Heat treatment (solution annealing) → Pickling → Hydrostatic testing

  • Surface Finish: Pickled, bright annealed, or polished

  • Weld Method: GTAW (Gas Tungsten Arc Welding) for corrosion resistance

  • End Finish: Beveled for butt welding or plain ends

  • Applications: Chemical process piping, marine piping systems, food & beverage production lines, desalination plants, pulp & paper mills


Mechanical Properties:


Property

Value

Test Standard

Tensile Strength

≥ 515 MPa

ASTM A370

Yield Strength

≥ 170 MPa

ASTM A370

Elongation

≥ 35%

ASTM A370

Hardness (HRB)

≤ 95

ASTM E18


Chemical Composition (%):


Element

Content

C

≤ 0.03

Mn

≤ 2.00

Si

≤ 1.00

P

≤ 0.045

S

≤ 0.030

Cr

16.00–18.00

Ni

10.00–14.00

Mo

2.00–3.00


Heavy-Duty Large Diameter Welded Stainless Steel Pipe


Specifications:

  • Grade: ASTM A358 TP 304H

  • Outer Diameter Range: 168 mm – 2000 mm

  • Wall Thickness: 3 mm – 40 mm

  • Length: 3 m – 12 m

  • Manufacturing Standard: ASTM A358, ASME SA358

  • Manufacturing Process: Hot-rolled plate → Press bending or roll forming → Submerged Arc Welding (SAW) → Heat treatment → X-ray inspection of welds → Hydrostatic test

  • Surface Finish: Pickled or sandblasted

  • Weld Method: Double-sided submerged arc welding for strength

  • End Finish: Beveled ends for field welding

  • Applications: High-temperature and high-pressure service in oil refineries, power plants, chemical plants, and exhaust systems


Mechanical Properties:


Property

Value

Test Standard

Tensile Strength

≥ 515 MPa

ASTM A370

Yield Strength

≥ 205 MPa

ASTM A370

Elongation

≥ 40%

ASTM A370

Hardness (HRB)

≤ 90

ASTM E18


Chemical Composition (%):


(Same as 304 stainless steel, but with higher carbon for improved high-temperature creep strength.)


Element

Content

C

0.04–0.10

Mn

≤ 2.00

Si

≤ 1.00

P

≤ 0.045

S

≤ 0.030

Cr

18.00–20.00

Ni

8.00–10.50


Production Process


  • Electric resistance-welded pipes & tubes

  • Hot electric resistance-welded pipes & tubes

  • Arc-welded pipes & tubes (SAWH pipe (by Spiral process))

Product Real Shot



Packaging and Shipping



FAQ


Q1: What product information must I provide before making a purchase?
A: Please provide the grade, width, thickness, surface treatment requirements, and the quantities you need.

Q2: What about product pricing information?
A: Prices may vary due to fluctuations in raw material costs.

Q3: Is it possible to send samples?
A: Yes, we offer free samples with express shipping worldwide.

Q4: Do you offer a service for customized products?
A: Yes, we can supply according to your specific requirements.

Q5: Can I visit you in person?
A: Customers from all over the world are welcome to meet with us.

Q6: Can you assist me in importing steel products for the first time?
A: Yes, we can provide support through our experienced shipping agents.


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