ASTM A691/A691M, ASME SA-691/SA-691M steel pipe is a carbon steel pipe for high-temperature and high-pressure environments, which can be formed by bending, crimping, and similar processes, and is also suitable for welding operations. Alloy steel pipe material grades (chemical composition) are CM-65 grade, CM-70 grade, CM-75 grade, 1/2CR, 1CR, 1-1/4CR, 2-1/4CR, 3CR, 5CR, 9CR, 91, etc. Welded steel pipe material grades (chemical composition) are welded CMS-75 grade, CMSH-70 grade, and CMSH-80 grade, which are welded by electrofusion welding process. Manufacturing.

Product Size

Outside diameter: NPS 3''-80'' ; 88.9～2032mm
Wall thickness: 4～60.00mm
End: Flat end, beveled or threaded for selection.
Length: 3～12 meters or SRL, DRL, double feet and fixed feet

Packaging

Outer surface with clear/black paint, hot dip galvanized or anti-corrosion treatment (FBE, 3LP, 3LPP) for option, steel strapping.

Chemical composition

Grades/Elements	Mn (≤，%)	Si (%)	Mo (%)	P	S	Ni	Cr	Cu
Grades/Elements	WT≤25mm	25＜WT≤50mm	50＜WT≤100mm	WT＞100mm				≤，%
CM-70	0.20	0.23	0.25	0.27	0.98	0.13～0.45	0.41～0.64	0.025	0.025
CM-75	0.23	0.26	0.28	0.28	0.98	0.13～0.45	0.41～0.64	0.025	0.025

Grades/Elements

P(≤)

S(≤)

1/2Cr

0.05～0.21

0.50～0.88

0.13～0.45

0.025

0.40～0.65

0.46～0.85

1Cr

0.04～0.17

0.35～0.73

0.13～0.45

0.025

0.40～0.65

0.74～1.21

1-1/4Cr

0.04～0.17

0.35～0.73

0.44～0.86

0.025

0.40～0.70

0.94～1.56

2-1/4Cr

0.04～0.15

0.25～0.66

C0.50

0.025

0.85～1.15

1.88～2.62

3Cr

0.04～0.15

0.25～0.66

≤0.50

0.025

0.85～1.15

2.63～3.37

5Cr

≤0.15

0.25～0.66

≤0.55

0.025

0.40～0.70

3.90～6.10

9Cr

≤0.15

0.25～0.66

≤1.05

0.025

0.85～1.15

7.90～10.10

≤0.05

0.06～0.15

0.25～0.66

0.18～0.56

0.025

0.012

0.80～1.10

≤0.43

7.90～9.60

≤0.02

0.16～0.27

0.05～0.11

≤0.01

0.025～0.080

Grades/Elements	Mn(%)		C(%)		Si	P	S	Mo	Ni	Cr	Cu
Grades/Elements	WT≤25mm	WT＞25mm	WT≤25mm	WT＞25mm		≤，%
CMS-75	0.84～1.52	0.84～1.62	≤0.26	≤0.28	0.13～0.45	0.025	0.025
	WT≤40mm	WT＞40mm
CMSH-70	0.64～1.46	0.92～1.72	≤0.24		0.13～0.55	0.025	0.025	0.09	0.28	0.29	0.38
CMSH-80	0.64～1.46	0.92～1.72	≤0.24		0.13～0.55	0.025	0.025	0.09	0.28	0.29	0.38

Product Mechanical Properties

	Tensile strength, MPa	Yield strength ≥, MPa	Elongation after break ≥, %
CM-65	450～585	255	23
CM-70	485～620	275	21
CM-75	515～655	295	20

	Tensile strength, MPa	Yield strength ≥, MPa	Elongation after break ≥, %	Tensile strength, MPa	Yield strength ≥, MPa	Elongation after break ≥, %	Section shrinkage ≥, %
	Manufacture of Class 1 steel plates	Manufacture of Class 2 steel plates	Manufacture of Class 1 steel plates	Manufacture of Class 2 steel plates	Manufacture of Class 1 steel plates	Manufacture of Class 2 steel plates	Manufacture of Class 1 steel plates	Manufacture of Class 2 steel plates
1/2Cr	380～550	485～620	230	310	22	22
1Cr	380～550	450～585	230	275	22	22
1-1/4Cr	415～585	515～690	240	310	18	18
2-1/4Cr	415～585	515～690	205	310	18	18	40	40
3Cr	415～585	515～690	205	310	18	18	40	40
5Cr	415～585	515～690	205	310	18	18	40	40
9Cr	415～585	515～690	205	310	18	18	40	40
91		585～760		415		18

	Tensile strength, MPa	Yield strength ≥, MPa	Elongation after break ≥, %
CMS-75	515～655	WT≤25mm，290	19
		WT＞25mm，275
CMSH-70	WT≤65mm，485～620	WT≤65mm，345	22
	65＜WT≥100mm，450～585	65＜WT≥100mm，310
CMSH-80	WT≤65mm，550～690	WT≤65mm，415	WT≤100mm，22 WT＞100mm，20
	65＜WT≥100mm，515～655	65＜WT≥100mm，380
	100＜WT≥150mm，485～620	100＜WT≥150mm，315

Application range
Typically used in the construction of petroleum and petrochemical refineries, power plants, boilers and ships that transport fluids and gases with high temperatures and pressures.

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