ASTM A691 Steel Pipe

Allland as China leading ASTM A691 Chrome Moly EFW steel pipe manufacturer since 2003, supply tens of thousands of tons of ASTM A691 steel pipe to the world every year. These pipes are manufactured in Electric-Fusion-Welded process, and fabricated with Chrome Moly Steel Plate in ASTM A387. ASTM A691 specification covers carbon and alloy steel pipe, electric-fusion-welded with filler metal added, fabricated from pressure-vessel-quality plate of several analyses and strength levels and suitable for high-pressure service at high temperatures.

  • Grade: 1Cr, 1-1/4Cr, 2-1/4Cr, 3Cr, 5Cr
  • Class: 12, 20, 21, 22, 30, 32, 40, 50
  • Out Diameter: 406.4-1422.2mm(16″-56″)
  • Wall Thickness: 7.92-75mm
  • Length: 3-18 meters
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Category:
% 1CR 1-1/4CR 2-1/4 CR 5 CR 9 CR 91
C 0.05-0.17 0.05-0.17 0.05-0.15 0.15 0.15 0.08-0.12
Mn 0.40-0.65 0.40-0.65 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60
P 0.025 0.025 0.025 0.025 0.025 0.020
S 0.025 0.025 0.025 0.025 0.025 0.010
Si 0.15-0.40 0.50-0.80 0.50 0.50 1.00 0.20-0.50
Cr 0.80-1.15 1.00-1.50 2.00-2.50 4.00-6.00 8.00-10.00 8.00-9.50
Mo 0.45-0.60 0.45-0.65 0.90-1.10 0.45-0.65 0.90-1.10 0.85-1.05
V – – – – 0.04 0.18-0.25

*Grade 91 also includes restrictions on Nickel 0.40 max, Columbium 0.06-0.10, Nitrogen 0.030-0.070, Aluminum 0.02 max, titanium 0.01 max, Zirconium 0.01 max.

Class 1 Plates

Grade Tensile (MPa) Yield (MPa) Elong. (50mm) Reduc’n of Area*
1CR 380 – 550 230 min 22% min –
1-1/4CR 415 – 585 240 min 22% min –
2-1/4CR, 5CR, 9CR 415 – 585 205 min 18% min 40% min
91 415 – 585 205 min 18% min 40% min

* Measured on a flat specimen

Class 2 Plates

Grade Tensile (MPa) Yield (MPa) Elong. (50 mm) Reduc’n of Area*
2 485 – 620 310 min 22% min –
1-1/4CR 515 – 690 310 min 22% min –
1CR 450 – 585 275 min 22% min –
2-1/4CR, 5CR, 9CR 515 – 690 310 min 18% min 40% min
91 585 – 760 415 min 18% min –

* Measured on a flat specimen

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