ASTM A312 TP321H Stainless steel welded pipes supplier


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We produce and export ASTM A312 TP321H stainless steel welded pipes. ASTM A312 TP 321H Thickness wall stainless steel welded tubes manufacturer in China.

A312 TP321H Welded pipe Specification: ASTM A312 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.



We supply high quality ASTM A312 Seamless Pipe and ASTM A312 Stainless Steel Welded Pipe that is sized, cut, and finished according to your exact specifications,304 pipe and tubing is available with ODs from 12.7MM to 2500MM? with wall thickness from 0.8MM to 60MM. We supply ASTM A312 TP 316 pipes after all quality parameters checks by experienced and good knowledge staff. We stocks a wide range of industry standard sizes of ASTM A312 Seamless Stainless Steel Pipes.



Stainless TP321H welded pipe production range: astm a312 pipe dimensions

OD12.7 to 2500mm, Thick:0.8mm-60mm, Length 500mm to 13000mm


Adopt standard: ASTM A312, ASME SA312, ASTM A213, ASME SA213 and others.



A312 TP321H Welded pipe Chemical Composition

Grade UNS
Composition, %
C Mn P S Si Cr Ni Mb Ti Nb N Cu Ce B Al
TP321 S32100 0.08 2 0.045 0.03 1 17.0–19 9.0–12 . . . Ti 5 × (C+N) min, 0.70 max . . . 0.1 . . . . . .
TP321H S32109 0.04 – 0.1 2 0.045 0.03 1 17.0–19 9.0–12 . . . 4(C+N) min; 0.70 max . . . 0.1 . . . . . .
TP321H S32654 0.02 2.0-4 0.03 0.005 0.5 24.0–25 21.0–23 7.0-8 . . . . . . 0.45- 0.55 0.30-0.6 . . .
TP321H S33228 0.04 – 0.08 1 0.02 0.015 0.3 26.0–28 31.0–33 . . . . . . 0.60- 1 . . . . . . 0.05 – 0.1 0.025
TP321H S34565 0.03 5.0-7 0.03 0.01 1 23.0–25 16.0–18 4.0-5 . . . 0.1 0.40- 0.6 . . . . . .




A312 TP321H Welded pipe Tensile Requirements

Grade UNS
Tensile Strength, Min. ksi [MPa] Yield strength, min ksi [MPa] other
TP321 S31600 75 [515] 30 [205]
TP321L S31603 70 [485] 25 [170]
TP321H S31609 75 [515] 30 [205]
S31635 75 [515] 30 [205]



A312 TP321H Welded pipe Heat Treatment Requirements

Grade UNS
Finished Heating Temperature Cooling/testing Requirements
TP321 S31609 Cold 1900 °F [1040 °C] See Spec
TP321 S31610 Hot 1900 °F [1040 °C] See Spec
TP321H S32109, S32615 Cold 2000 °F [1100 °C] See Spec
TP321H S32109, S32615 Hot 1925 °F [1050 °C] See Spec
TP321H S32654 2100 °F [1150 °C] See Spec
TP321H S33228 2050—2160 °F [1120—1180 °C] See Spec
TP321H S34565 2050—2140 °F [1120—1170 °C] See Spec


A312 TP321H Welded pipe Elongation Requirements

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


Our TP321H 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.




A312 TP321H Welded pipe ship marking:


Markings will adhere to prescribed specifications in A999/A999M and shall include the NPS or OD and schedule number or average wall thickness, heat number, and NH (when hydrotesting is not performed) and ET (when eddy-current testing is performed) or UT (when ultrasonic testing is performed). The marking shall also include the manufacturer’s private identifying mark, the marking requirement of section 12.3 on Hydrostatic or Nondestructive Electric Test, if applicable, and whether seamless (SML), welded (WLD), or heavily cold-worked (HCW). For Grades TP304N, TP321HH, TP321HH & TP347H, the marking shall also include the heat number and heat-treatment lot identification.

Referenced Documents:


ASTM 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)


For us quality always stands first, and we would provide 100% free replacement to our customer. At the same time, we also strive to ensure that our quality for cold drawn stainless steel pipes and tubes is the best in the industry. Our continuous focus on quality, price and service has helped us win many order from India, and overseas. We welcome you to contact us for best prices for ASTM A312 stainless steel pipes and tubes from our factory


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