Name: Stainless Steel Seamless Pipe
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Stainless Steel Seamless Pipe

Stainless steel seamless pipes are manufactured without a welded seam, typically by hot extrusion, piercing, and subsequent cold drawing or cold rolling. This process ensures uniform material structure and superior mechanical properties, making them ideal for high-pressure, high-temperature, and critical corrosion environments.
Seamless pipes are preferred in oil and gas, chemical, power generation, aerospace, and nuclear industries where safety and durability are paramount. They have higher cost compared to welded pipes but provide enhanced strength and resistance to localized corrosion such as pitting or crevice attack.

PRODUCT DESCRIPTION

General Purpose Seamless Pipe

Specifications:

Grade: ASTM A312 TP 304 / 304L
Outer Diameter Range: 6 mm – 610 mm
Wall Thickness: 1 mm – 50 mm
Length: 1 m – 12 m
Standards: ASTM A312 / ASME SA312, JIS G3459
Manufacturing Process: Hot piercing → Hot rolling → Cold drawing → Solution annealing → Pickling → Hydrostatic testing
Surface Finish: Pickled, bright annealed
End Finish: Plain, beveled
Applications: Pressure piping, heat exchangers, general fluid transport, mechanical tubing

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

High-Temperature Seamless Pipe

Specifications:

Grade: ASTM A312 TP 310S
Outer Diameter: 10 mm – 325 mm
Wall Thickness: 1.5 mm – 25 mm
Standards: ASTM A312, DIN 17456
Manufacturing Process: Hot extrusion → Heat treatment (solution annealing) → Pickling → UT/NDT testing
Applications: Furnace tubes, heat treatment plants, boiler tubing, high-temperature fluid piping

Mechanical Properties:

Property	Value	Test Standard
Tensile Strength	≥ 520 MPa	ASTM A370
Yield Strength	≥ 205 MPa	ASTM A370
Elongation	≥ 40%	ASTM A370
Hardness (HRB)	≤ 95	ASTM E18

Chemical Composition (%):

Element	Content
C	≤ 0.08
Mn	≤ 2.00
Si	≤ 1.50
P	≤ 0.045
S	≤ 0.030
Cr	24.00–26.00
Ni	19.00–22.00

Corrosion-Resistant Seamless Pipe

Specifications:

Grade: ASTM A312 TP 904L
Outer Diameter: 12 mm – 325 mm
Wall Thickness: 1.5 mm – 20 mm
Standards: ASTM A312 / ASME SA312
Manufacturing Process: Hot rolling → Solution annealing → Pickling → 100% Eddy Current Testing
Applications: Sulfuric acid service, chemical processing plants, offshore oil platforms, desalination equipment

Mechanical Properties:

Property	Value	Test Standard
Tensile Strength	≥ 490 MPa	ASTM A370
Yield Strength	≥ 220 MPa	ASTM A370
Elongation	≥ 35%	ASTM A370
Hardness (HRB)	≤ 95	ASTM E18