　　ASTM A312 covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.

　　Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, it is permitted to specify in the order one or more of these supplementary requirements.

　　Nominal Pipe Size (NPS): 1/8, 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2, 2, 21/2 inch

　　Outside Diameter: 10,3 - 73 mm (0,405 - 2,875 inch)

　　Wall Thickness: 1,73 - 7,01 (0,068 - 0,276 inch)

　　Notes:

　　Steel Grades - TP 304, TP 304L, TP 316, TP 321

　　Size of pipes in accordance with ANSI/ASME B36. 19M.

　　All technical requirements in accordance with ASTM A530.

　　Length tolerance of measured pipes is not greater than +10 mm.

　　The quality of pipes is ensured by manufacturing process and non-destructive test.

　　Intergranular corrosion test in accordance with ASTM A262, Practice E is available.

Sizes
inch	OD, mm	Wall Thickness,	Max. Length, м
1/8	10,3	1,73; 2,11	12
1/4	13,7	2,24; 3,02
3/8	17,1	2,31; 3,20
1/2	21,3	2,11; 3,73
3/4	26,7	2,87; 3,91
1	33,4	3,38; 4,55; 6,35	10
1 1/4	42,4	3,56; 4,85; 6,35
1 1/2	48,3	3,68; 5,03; 7,14
2	60,3	3,58; 3,91; 4,37; 4,78; 6,35; 6,94; 7,14
2 1/2	73,0	3,58; 3,95; 4,37; 4,78; 5,16; 5,49; 6,35; 7,01

Mechanical properties
Steel Grade	Tensile Strength, N/mm2 (min)	Yield Strength, N/mm2 (min)	Elongation, % (min)
TP304	515	205	35
TP304L	485	170	35
TP316	515	205	35
TP316L	485	170	35
TP321	OD < 17,1 mm - 515;	OD < 17,1 mm - 205;	35
TP321	OD > 17,1 mm - 485	OD > 17,1 mm - 170	35

Chemical Composition (%, max)
Steel Grade	C	Si	Mn	Cr	Ni	Mo	S	P
TP304	0,08	0,75	2	18 - 20	8-11	-	0,03	0,04
TP304L	0,035	0,75	2	18 - 20	8-13	-	0,03	0,04
TP316	0,08	0,75	2	16 - 18	11-14	2-3	0,03	0,04
TP316L	0,035	0,75	2	16 - 18	10-15	2-3	0,03	0,04
TP321	0,08	0,75	2	17 - 20	9-13	-	0,03	0,04