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ASTM A312-Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

ASTM A312 Standard Specification covers standard specification for seamless, straight-seam welded, and cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. Several grades of steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, columbium, tantalum, nitrogen, vanadium, copper, cerium, boron, aluminum, and others. All pipes shall be furnished in the heat-treated condition in accordance with the required heat treating temperature and cooling/testing requirements. Tensile properties of the material shall conform to the prescribed tensile strength and yield strength. The steel pipe shall undergo mechanical tests such as transverse or longitudinal tension test and flattening test. Grain size determination and weld decay tests shall be performed. Each pipe shall also be subjected to the nondestructive electric test or the hydrostatic test.

ASTM A312 stainless steel
ASTM A312 / A312M, Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes, covering Austenitic stainless steels, and manufactured both welded and seamless type for option.

ASTM A312 stainless steel pipe is widely used for high temperature service and general service, pipe size from 1/8 inch to 30 inch for outside diameter, wall thickness from Schedule 5S to 80S.

Chemical Requirements And Mechanical Properties
ASTM A312 covers Austenitic stainless steels, including TP304, TP304L, TP304H, TP304LN, TP309S, TP309J, TP310S, TP310H, TP316, TP316L, TP316H, TP316TI, TP317, TP317L, TP321, TP321H, TP347, TP347H, these grades have unique composition and properties, common stainless steel grades with chemical composition and properties are specified as following.
Nansteel Manufacturing Co.,Ltd supplies a full range of ASTM A312 stainless steel pipes, click to check View of ASTM A312 Dimensional Table

Chemical Composition
Grade Carbon Silicon Manganese Chromium Nickel Molybdenum Sulfur Phosphorous
TP304 0,08 1,0 2 18.0 – 20.0 8.0 – 11.0 0,03 0,045
TP304L 0,035 1,0 2 18.0 – 20.0 8.0 – 13.0 0,03 0,045
TP316 0,08 1,0 2 16.0 – 18.0 10.0 – 14.0 2.00 – 3.00 0,03 0,045
TP316L 0,035 1,0 2 16.0 – 18.0 10.0 – 15.0 2.00 – 3.00 0,03 0,045
TP321 0,08 1,0 2 17.0 – 19.0 9.0 – 12.0 0,03 0,045

Mechanical Properties
Steel Grade Heat Treatment Temperure Min. º F(º C) Tensile Strength Ksi (MPa), Min. Yield Strength Ksi (MPa), Min. Elongation %, Min
TP304 Solution 1900 (1040) 75(515) 30(205) 35
TP304L Solution 1900 (1040) 70(485) 25(170) 35
TP304H Solution 1900 (1040) 75(515) 30(205) 35
TP310S Solution 1900 (1040) 75(515) 30(205) 35
TP316 Solution 1900(1040) 75(515) 30(205) 35
TP316L Solution 1900(1040) 70(485) 25(170) 35
TP316H Solution 1900(1040) 75(515) 30(205) 35
TP316Ti Solution 1900(1040) 75(515) 30(205) 35
TP321 Solution 1900(1040) 75(515) 30(205) 35
TP321H Solution Cold: 2000(1100) Hot: 1925(1050) 75(515) 30(205) 35
TP347 Solution 1900(1040) 75(515) 30(205) 35
TP347H Solution Cold: 2000(1100) Hot: 1925(1050) 75(515) 30(205)  


ASTM A312 Pipe Manufacturing
ASTM A312 Seamless Pipe
Pipe should be made from stainless steel billet in hot rolling or cold drawn, no any welding process during manufacturing, seamless pipe has better pressure to withstand, annealing solution and pickling finishing condition, applied for high temperature and corrosion environment.

ASTM A312 Welded Pipe
No additional metal using automatic welding process for welded pipe, made from stainless steel strip or plate, both single welding and double welding for option, smail diameter and arge diameter are available, annealing pickling finish.

Heavily Cold-Worked (HCW) Pipe
Pipe shall be made by applying cold working of not less than 35 % reduction in thickness of both wall and weld to a welded pipe prior to the final anneal. No filler shall be used in making the weld. Prior to cold working, the weld shall be 100 % radiographically inspected.

Heat Treatment
All pipe shall be furnished in the heat-treated condition in accordance with the required heat treating temperature and cooling requirements, pipes shall be individually quenched in water or rapidly cooled by other means (direct quenched).

The pipe shall be free of scale and contaminating exogenous iron particles. Pickling, blasting, or surface finishing is not mandatory when pipe is bright annealed.
 

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