ASTM A312 Stainless Steel Pipe

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ASTM A312 is the standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipes. The ASTM A312 specification covers nominal wall thicknesses and grades of stainless steel typically used in high temperature and general corrosive service applications. These pipes have a high degree of strength, excellent corrosion resistance, excellent high temperature performance and good processability. ASTM A312 stainless steel pipe is widely used in oil and gas, petrochemical, food processing, pharmaceutical and many other industries where pipes are exposed to high temperature and corrosive environment.

 

Chemical Composition of ASTM A312 Stainless Steel Pipe

Grade	UNS	C≤	Mn	P≤	S≤	Si≤	Cr	Mo	Ni	Cu
TP304	S30400	0.08	2	0.045	0.03	1	18.0-20.0	-	8.0-11.0	-
TP304L	S30403	0.035	2	0.045	0.03	1	18.0-20.0	-	8.0-13.0	-
TP316	S31600	0.08	2	0.045	0.03	1	16.0-18.0	2.00-3.00	10.0-14.0	-
TP316L	S31603	0.035	2	0.045	0.03	1	16.0-18.0	2.00-3.00	11.0-14.0	-
316Ti	S31635	0.08	2	0.045	0.03	0.75	16.0-18.0	2.00-3.00	10.0-12.0	-
TP317	S31700	0.08	2	0.045	0.03	1	18.0-20.0	3.0-4.0	11.0-14.0	-
TP317L	S31703	0.035	2	0.045	0.03	1	18.0-20.0	3.0-4.0	11.0-15.0	-
TP321	S32100	0.08	2	0.045	0.03	1	17.0-19.0	-	9.0-12.0	-
321H	S32109	0.04-0.1	2	0.045	0.03	1	17.0-19.0	-	9.0-12.0	-
310	S31000	0.25	2	0.045	0.03	1.5	24.0-26.0	0.75	19.0-22.0	-
TP310S	S31008	0.08	2	0.045	0.03	1	24.0-26.0	0.75	19.0-22.0	-
TP347	S34700	0.08	2	0.045	0.03	1	17.0-19.0	-	9.0-13.0	-
254SMO	S31254	0.02	1	0.03	0.01	0.8	19.5-20.5	6.0-6.5	17.5-18.5	0.5-1.0
AL-6XN	N08367	0.03	2	0.04	0.03	1	20.0-22.0	6.0-7.0	23.5-25.5	0.75
F904L	N08904	0.02	2	0.04	0.03	1	19.0-23.0	4.0-5.0	23.0-28.0	1.0-2.0

 

ASTM A312 Stainless Steel Pipe Mechanical Properties

Mechanical properties	Tensile, min, ksi[MPa】	Yield, min, ksi[MPa】	Elongation, %(min)	Hardness, HB（max）
TP304	75【515】	30【205】	35	192
TP304L	70【485】	25【170】	35	192
TP316	75【515】	30【205】	35	192
TP316L	70【485】	25【170】	35	192
316Ti	75【515】	30【205】	35	192
TP317	75【515】	30【205】	35	192
TP317L	75【515】	30【205】	35	192
TP321	75【515】	30【205】	35	192
321H	75【515】	30【205】	35	192
TP310	75【515】	30【205】	35	192
TP310S	75【515】	30【205】	35	192
TP347	75【515】	30【205】	35	192
S31254	98【675】	43【310】	35	220
N08367	100【690】	45【310】	30	241
N08926	94【650】	43【295】	35	256
N08904	71【490】	31【215】	35	192

 

The production process of ASTM A312 stainless steel pipe starts with the selection of high-quality raw materials. Raw materials must meet the requirements of the specification, and there must be no defects such as cracks and seams. Raw materials are then subjected to various tests to ensure their quality, including chemical analysis, mechanical testing and non-destructive testing.

 

The next step in the production process is the formation of the pipes. This process can be done by two methods: ASME SA312 seamless pipe and ASME SA312 welded pipe. Seamless pipe is formed by perforating a solid billet of stainless steel and then extruding the material through a die into its final shape. Welded pipe is formed by welding two or more pieces of stainless steel together using various welding techniques such as resistance welding, electric fusion welding, etc.

 

After the pipe is formed, various finishing processes are carried out to meet the specification requirements. These processes include heat treatment, cold working, polishing, etc. Heat treatment is used to improve the mechanical properties of the pipe, such as hardness, strength and toughness. Cold working is used to improve the dimensional accuracy of the tubing, while polishing is used to improve the surface finish.

 

When purchasing ASTM A312 stainless steel pipe, it is important to ensure that the material meets the required codes and standards to ensure the safety and reliability of the piping system. It is also important to consider specific application requirements to select the proper pipe grade and size. HT PIPE stock ASTM A312 stainless steel pipe.

 

Nominal Dimensions of Stainless Steel Pipe

DN	NPS	OD(mm) outside diameter	Sch5S	Sch10S	Sch40S	Sch80S	Sch160S
6	1/8	10.3	-	1.24	1.73	2.41	3.15
8	1/4	13.7	-	1.65	2.24	3.02	3.68
10	3/8	17.1	-	1.65	2.31	3.2	4.01
15	1/2	21.3	1.65	2.11	2.77	3.73	4.78
20	3/4	26.7	1.65	2.11	2.87	3.91	5.56
25	1	33.4	1.65	2.77	3.38	4.55	6.35
32	1 1/4	42.2	1.65	2.77	3.56	4.85	6.35
40	1 1/2	48.3	1.65	2.77	3.68	5.08	7.14
50	2	60.3	1.65	2.77	3.91	5.54	8.74
65	2 1/2	73	2.11	3.05	5.16	7.01	9.52
80	3	88.9	2.11	3.05	5.49	7.62	11.13
90	3 1/2	101.6	2.11	3.05	5.74	8.08	-
100	4	114.3	2.11	3.05	6.02	8.56	13.49
125	5	141.3	2.77	3.40	6.55	9.53	15.88
150	6	168.3	2.77	3.40	7.11	10.97	18.26
200	8	219.1	2.77	3.76	8.18	12.7	-
250	10	273.1	3.40	4.19	9.27	12.7	-
300	12	323.9	3.96	4.57	9.53	12.7	-
350	14	355.6	3.96	4.78	9.53	12.7	-
400	16	406.4	4.19	4.78	9.53	12.7	-
450	18	457	4.19	4.78	9.53	12.7	-
500	20	508	4.78	5.54	9.53	12.7	-
550	22	559	4.78	5.54	-	-	-
600	24	610	5.54	6.35	9.53	12.7	-
650	26	660	-	-	-	-	-
700	28	711	-	-	-	-	-
750	30	762	6.35	7.92	-	-	-

 

ASTM A312 Dimension Tolerance Table

Standard	Outside Diameter (mm）		Thickness（mm）			Length（mm)
ASTM A312	10.29~48.26	+0.4/-0.8	+12.5/-12.5			+6.0/0
	48.26~114.30	+0.8/-0.8
	114.30~219.08	+1.6/-0.8
	219.08~457.20	+2.4/-0.8

 

 

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