A312 TP309SSeamless pipes,A312 TP309S Welded Stainless steel pipes


Supplier of ASTM A312 Standard Specification for A312 TP309S Seamless stainless steel pipes, A312 TP309S Welded stainless steel pipes, and A312 TP309S Heavily Cold Worked Austenitic Stainless Steel Pipes


1. Gangsteel produced and exported A312 TP309S high quality Seamless stainless pipe,welded stainless steel pipe, heavily cold worked stainless pipes with the range of outer diameter 3.2-800mm, Wall thickness 0.25-50mm ,Supplier of The main Steel Grade is ASTM A312 TP309S.


2. A312 TP309S Stainless pipe referenced documents for production

   A 262 Practices for Detecting Susceptibility to Intergranular Intergranular Attack in Austenitic Stainless Steels

A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
   A 941 Terminology Relating to Steel, Stainless Steel, Related Alloys and Ferroalloys

A 1016/A 1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes

E 112 Test Methods for Determining Average Grain Size

E 381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

E 527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

ANSI Standard  A312 TP309S Stainless pipe

B1.20.1 Pipe Threads, General Purpose

B36.10 Welded and Seamless Wrought Steel Pipe

B36.19 Stainless Steel Pipe

ASME Standard:  A312 TP309S Stainless pipe

ASME Boiler and Pressure Vessel Code : Section VIII5

AWS Standard:

A5.9 Corrosion-Resisting Chromium and Chromium-

Nickel Steel Welding Rods and Electrodes6

 Other Standard: A312 TP309S Stainless pipe

SAE J1086 Practice for Numbering Metals and Alloys


3. A312 TP309S Permitted Variations in Wall Thickness

Tolerance, % from Nominal  

NPS Designator       Over    Under

1⁄8 to 21⁄2 incl., all t/    20.0     12.5


3 to 18 incl., t/D up to 5 %

incl.                 22.5       12.5

3 to 18 incl., t/D > 5%   15.0      12.5

20 and larger, welded, all

t/D ratios             17.5     12.5

20 and larger, seamless,

t/D up to 5 % incl.      22.5    12.5

20 and larger, seamless,

t/D > 5%              15.0   12.5


t = Nominal Wall Thickness

D = Ordered Outside Diameter


4. A312 TP309S Stainless pipe Chemical Composition (Unit %)



A312 TP309S

UNS Grade


Carbon % Max


Manganese %


Phosphorus % Max


Sulfur % Max


Silicon % Max


Chromium %


Nickel %


Molybdenum %

   Max 0.75

Nitrogen  % Max

Niobium  %

Titanium %

Others Elements %

5. Mark of A312 TP309S Stainless pipe Chemical elements

A New designation established in accordance with Practice E 527 and SAE J1086.

B Maximum, unless otherwise indicated. Where elipses (...) appear in this table, there is no requirement and analysis for the element need not be determined or reported.

C The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer.

D For small diameter or thin walls or both, where many drawing passes are required, a carbon maximum of 0.040 % is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those

less than 0.500 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.20 mm] in average wall thickness (0.044 in. [1.10 mm] in minimum wall thickness).

E For welded TP316, TP316N, TP316LN, and TP316H pipe, the nickel range shall be 10.0–14.0 %.

F For welded pipe, the phosphorus maximum shall be 0.045 %.

G The titanium content shall be not less than five times the carbon content and not more than 0.70 %.

H The titanium content shall be not less than four times the carbon content and not more than 0.60 %.

I The columbium content shall be not less than ten times the carbon content and not more than 1.00 %.

J The columbium content shall be not less than eight times the carbon content and not more than 1.0 %.

K Grade S34751 shall have a columbium (niobium) plus tantalum content of not less than 15 times the carbon content.


6. A312 TP309S Tensile and A312 TP309SStainless pipe Hardness Requirement



Stainless Pipe Grade

A312 TP309S

UNS Grade


Tensile Strength Mpa


Yield Strength Mpa


Elongation %


Hardness Brinell HBW max


Hardness Vickers HV max


Hardness Rockwell HRB max



7. A312 TP309S Stainless pipe Heat Treatment and Gain Size Requirement


Stainless Pipe Grade

A312 TP309S

UNS Number


Heat Treat Type

Solution Treatment

Solutioning Temperature


Cooling Media

Water of rapid cool














8. A312 TP309S Stainless pipe Delivery time
  Gangsteel Factory produced them in 20days and we also had Stock list of 3000tons At TP321, TP316, TP316L,TP309S, TP310 and others.
  We can provide the package of each pipe to promise delivery condition by sea.


9. A312 TP309S Stainless pipe Payment Item:

Delivery: 15 to 20 days according to your order quantity

Shipping: FCL,LCL,Buck ship

Loading Port: Shanghai,Tianjjin Port.

Packing: Wooden box,fixed with steel strip,then wrapped with woven bags

Payment terms: 30% T/T inadvance,70% balance after BL documents



Our advantage:

A. Annual production capacity:50,000 Mertic Ton

B. With at least 100 tons stock for general specification

C. Quote within 12 hours

D. 1 hours drive to nearest seaport

E. Delivery maximum 10 days for stock



10. A312 TP309S Stainless pipe Adopt Standard:

   ASTM A213, ASME SA213
   ASTM A312, ASME SA312
   ASTM A269
   ASTM A511

   ASTM A789

   ASTM A790


We are specialized in welded stainless steel pipe factory to export high quality A312 TP309S Stainless Steel Pipes. If you have any requirement for A312 TP309S Or technical requirement about A312 TP309S seamless stainless tubes, please feel free to contact us.

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