ASTM A312 TP321H Seamless tubes exporter


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A312 TP321H Seamless 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.

ASTM A312 TP321H Seamless tubes exporter
ASTM A312 TP321H Seamless tubes exporter


We produce ASTM A312 TP321H Seamless tube from China. The wall thickness from 0.8MM to 60MM. We export ASTM A312 TP321H Seamless pipes and supply in 20days.


Ryin Stainless stock a wide range of industry standard sizes of ASTM A312 Seamless Stainless-Steel Pipes. all quality parameters checked by experienced and good knowledge staff.



ASTM TP321H Seamless tube production range: ASTM A312 pipe dimensions

OD10 to 2500mm, Thick:0.8mm-60mm, Length 500mm to 12000mm


Adopt standard: ASTM A312



A312 TP321H Seamless tube Chemical Composition


Grade UNS Composition, %
Design C Mn P S Si
A312 TP321H S32109 0.04-0.1 2.0 0.045 0.030 1
Cr Ni Ti Mo N
17-19 9-12 0.1



A312 TP321H Seamless tube Tensile Requirements

Grade UNS
Tensile Strength, Min. ksi [MPa] Yield strength, min ksi [MPa] Elongation in 2 in., min, %
A312 TP321H S32109 75 [515] 30 [235] 35



A312 TP321H Seamless tube marking:

  1. Nominal Pipe Size (Nominal Bore)
  2. Schedule (Wall Thickness)
  3. Specification
  4. Material Grade
  5. Method of Manufacture (Seamless or Welded)
  6. Heat Number
  7. Manufacturers Name or Symbol

A312 TP321H Permitted Variations in Wall Thickness

In addition to the implicit limitation of wall thickness for seamless pipe imposed by the limitation on weight in Specification A999/A999M, the wall thickness for seamless and welded pipe at any point shall be within the tolerances specified in ASTM A312 Table, except that for welded pipe the weld area shall not be limited by the “Over” tolerance.

The wall thickness and outside diameter for inspection for compliance with this requirement for pipe ordered by NPS and schedule number is shown in Table X1.1 at ASTM A312


A312 TP321H Seamless tube Referenced Documents

ASTM 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 Microteach Testing Steel Bars, Billets,1 Blooms, and Forgings

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

ANSI Standards:

B1.20.1 Pipe Threads, General Purpose

B36.10 Welded and Seamless Wrought Steel Pipe

B36.19 Stainless Steel Pipe


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 orders from China and overseas.


Ryin Stainless factory welcome you to contact us for best prices for ASTM A312 TP321H stainless seamless  steel pipes and tubes.




ASTM A312 TP321H Seamless tubes exporter

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