We are ASME SA312 TP304H Stainless steel welded pipes supplier

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We produce and export ASME SA312 TP304H stainless steel welded pipes. ASME SA312 TP 304H Thickness wall stainless steel welded tubes manufacturer in China.

SA312 TP304H Welded pipe Specification: ASME SA312 specification covers seamless pipe and welded pipe for austenitic stainless steel. These high performance austenitic stainless steels have a fully austenitic microstructure in the quench annealed condition.

ASME SA312 TP304H Stainless steel welded pipes supplier
ASME SA312 TP304H Stainless steel welded pipes supplier

RYIN Stainless Welded pipe factory produce and export of stainless steel seamless and welded pipes per ASME SA312 in Grade of TP304H/304L, TP316/316L/316Ti, TP321/tp321H, TP SS347H, TP317L, TP904L TP309S/H TP310S/H and SS446 among other special grades. Stainless steel seamless tubes are available in compliance with ASME A213 and ASME SA312. The grades are 304/304L and 316/316L in standard tube sizes and wall thicknesses. We can offer custom size cold drawn stainless-steel pipes and stainless-steel tubes to our customers.
If you need more data, please check our stainless steel product list.

Stainless-steel pipes and stainless-steel tubes are available in standard OD or NB sizes

We offer other sizes according to our customers with our tube processing capabilities.

SA312 TP304H Welded pipe Chemical Composition


Grade UNS
Composition, %
C Mn P S Si Cr Ni Mb Ti Nb N Cu Ce B Al
SA312 TP304 S30400 0.08 2 0.045 0.03 1 18.0–20 8.0–11 . . . . . . . . . . . . . . . . . .
SA312 TP304L S30403 0.035 2 0.045 0.03 1 18.0–20 8.0–13 . . . . . . . . . . . . . . . . . .
SA312 TP304H S30409 0.04 – 0.1 2 0.045 0.03 1 18.0–20 8.0–11 . . . . . . . . . . . . . . . . . .



SA312 TP304H Welded pipe Tensile Requirements

Grade UNS
Tensile Strength, Min. ksi [MPa] Yield strength, min ksi [MPa] other
TP304 S30400 75 [515] 30 [205]
TP304L S30403 70 [485] 25 [170]
TP304H S30409 75 [515] 30 [205]
S30415 87 [600] 42 [290]


SA312 TP304H Welded pipe Heat Treatment Requirements

Grade UNS
Finished Heating Temperature Cooling/testing Requirements


S304, S30409 Cold 1900 °F [1040 °C] See Spec
SA312 TP304H S304, S30409 Hot 1900 °F [1040 °C] See Spec



SA312 TP304H Welded pipe Elongation Requirements

Elongation in 2 in., min, % longitudinal Transverse Grain size
Longitudinal Transverse
35 25 35 25  According to standard



Our TP304H Stainless Steel Welded pipe manufactured from cold-forming process using coils of steel sheet with automated spiral welds. Great strides were made in quality control, testing, joints and protective coatings. Welded steel pipe is available in wide ranges of sizes and properties of the steel. These ERW Pipes carry high strength, ease of installation, high flow capacity, leak resistance, long service life, reliability and versatility, and economy.



SA312 TP304H Welded pipe ship marking:


Markings will adhere to prescribed specifications in A999/A999M.

Marking include:
1. the OD and thickness
2.heat number
5. Xtray and UT

The marking  include the manufacturer’s private identifying mark which require  Hydrostatic or Nondestructive Electric Test.

if applicable, whether seamless (SML), welded (WLD), or heavily cold-worked (HCW). the marking shall also include the heat number and heat-treatment lot identification atGrades TP304H, TP316H, TP321H & TP347H.



Referenced Documents:

ASME Referenced Standards

A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

A370 Test Methods and Definitions for Mechanical Testing of Steel Products

A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys

A999 A999M Specification for General Requirements for Alloy and Stainless-Steel Pipe

A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless-Steel Tubes

E112 Test Methods for Determining Average Grain Size

E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

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ASME SA312 TP304H Welded pipes        ASME SA312 TP304L Welded pipes    ASTM A312 TP304L Welded pipes