In August 2025, a long-standing customer in Singapore sent us an inquiry for 347H stainless steel pipe. We rigorously verified the material quality according to the ASTM A312 standard and conducted spectral analysis and mechanical testing to ensure the 347H stainless steel high-temperature resistance and intergranular corrosion resistance met the customer’s requirements. Subsequently, our production department worked overtime to significantly increase production efficiency while ensuring quality. The finished pipes underwent a series of inspections and surface treatments and were accompanied by a complete MTC material certificate. Upon receipt, the customer expressed high praise for our product quality and delivery speed.

This not only solidified our long-standing partnership with our Singaporean customer but also further demonstrated our expertise and reliable service in the supply of high-performance stainless steel pipe.

Inspection Video

347H Stainless Steel Pipe MTC

ASTM A312 Stainless Steel Pipe Specification

Processing Method	Seamless and Welded
Size Range	1/8” – 30” / DN6 – 750
Thickness Schedule	SCH 10S- SCH 160, XXS
Length	6m or 12 m or Random
Standard	ASME B36.19
Surface Treatment	Polish , Mirror , Epoxy Powder FBE, 2PE, 3PE Coating
Material Grade	ASTM A312 TP304/304L/304H, 316/316L, 310S, 317, 347, 904L, S32205, S31803, 32750, 32760, S32550

Equivalent materials

China	American	Japanese	German
06Cr18Ni11Nb	Grade   347	SUS   347	X6CrNiNb18-10, 1.4550
07Cr18Ni11Nb	Grade   347H	/	X7CrNiNb18-10, 1.4912

347/347H Chemical Composition

Material	C	Mn	Si	Cr	Ni	P	S	Nb
347	≤0.08	≤2.00	≤0.75	17.0~19.0	9.0~13.0	≤0.045	≤0.03	10C~1.00
347H	0.04~0.10	≤2.00	≤0.75	17.0~19.0	9.0~13.0	≤0.045	≤0.03	8C~1.00

347/347H Physical Properties

Yield   Strength, 0.2% Offset MPa	Ultimate   Tensile Strength, MPa	Elongation   in 2 in. or 51 mm	Hardness,   Max.,   Brinell
205	515	35	217

Stainless Steel Pipe Dimension

Stainless Steel Pipe (ASME B 36.19M)
Nominal Size		OD	Sch5s		Sch10s		Sch40s		Sch80s
DN	NPS	0	T	kg/m	T	kg/m	T	kg/m	T	kg/m
6	1/8	10.3			1.24	0.28	1.73	0.37	2.41	0.47
8	1/4	13.7			1.65	0.49	2.24	0.63	3.02	0.8
10	3/8	17.1			1.65	0.63	2.31	0.84	3.2	1.1
15	1/2	21.3	1.65	0.82	2.11	1	2.77	1.27	3.73	1.62
20	3/4	26.7	1.65	1.04	2.11	1.28	2.87	1.69	3.91	2.2
25	1	33.4	1.65	1.33	2.77	2.09	3.38	2.5	4.55	3.24
32	1 1/4	42.2	1.65	1.68	2.77	2.7	3.56	3.39	4.85	4.47
40	1 1/2	48.3	1.65	1.95	2.77	3.11	3.68	4.05	5.08	5.41
50	2	60.3	1.65	2.44	2.77	3.93	3.91	5.44	5.54	7.48
65	2 1/2	73.0	2.11	3.77	3.05	5.26	5.16	8.63	7.01	11.41
80	3	88.9	2.11	4.6	3.05	6.45	5.49	11.29	7.62	15.27
90	31/2	101.6	2.11	5.29	3.05	7.4	5.74	13.57	8.08	18.63
100	4	114.3	2.11	5.96	3.05	8.36	6.02	16.07	8.56	22.32
125	5	141.3	2.77	9.67	3.4	11.57	6.55	21.77	9.53	30.97
150	6	168.3	2.77	11.55	3.4	13.48	7.11	28.26	10.97	42.56
200	8	219.1	2.77	15.09	3.76	19.96	8.18	42.55	12.7	64.64
250	10	273.1	3.4	23.08	4.19	27.78	9.27	60.31	12.7	96.01
300	12	323.9	3.96	31.89	4.57	36	9.53	73.88	12.7	132.08
350	14	355.6	3.96	35.06	4.78	41.3
400	16	406.4	4.19	42.41	4.78	47.29
450	18	457.2	4.19	47.77	4.78	53.26

Manufacturing Process

ASTM A312 covers two primary manufacturing processes:

Seamless steel : Made from billets through piercing and cold drawing/cold rolling, the pipe body has no welds and is suitable for applications requiring high pressure, high temperature, or high strength.

Welded : Made from coiled steel plate or strip and then welded, it is relatively low-cost and suitable for applications with less stringent pressure requirements.

Applications

Chemical Industry: Heat exchangers, chemical storage tanks, and piping systems

Oil and Gas: Pipelines transporting chloride-containing or corrosive media

Marine Engineering: Desalination plants, offshore platforms

Food and Pharmaceuticals: Pharmaceutical equipment, food processing piping

Energy: High-temperature boiler tubes, heat exchangers