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Welded Steel Pipe
ASTM A691 Steel Pipe
Size: 12.4mm to 1219mm(LSAW, SSAW, HSAW)
Range of Length: 5.8m to 11.8m, 6m to 12m.
Ends Procession: plain, beveled, threaded
Application: petroleum, chemical plant, power sector, gas industry, hardware tools, metallurgy,machinery, construction, shipbuilding
Standard and Grades: ASTM A691 1-1/4CR, 2-1/4CR, 2-1/4CR, 3CR, 5CR, 9CR, 91
Wall Thickness: SCH 2o, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160, up to 3 inch
Length: 6 meters, 12 meters or customized.
Surface Treatment: Painted, Natural, 3PE, FBE
Standard
Specification
ASTM A691 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. Heat treatment may or may not be required to attain the desired mechanical properties.
ASTM A691 are classified according to steel grades and are designated in classes according to the type of heat treatment performed in the pipe manufacture, whether the weld is radiographically examined, and whether the pipe has been pressure tested. The ASTM A691 steel welds shall be made either manually or automatically by an electric process involving the deposition of filler metal.
The welded joints shall have positive reinforcement at the center of each side of the weld. The contour of this reinforcement shall be smooth, and the deposited metal shall be fused smoothly and uniformly into the plate surface.
The joints shall undergo tension, bend and pressure tests. Unacceptable surface imperfections shall be removed by grinding or machining. The depression after grinding or machining shall be blended uniformly into the surrounding surface. Repair of weld and base metal defects shall be done by welding.
Specification
Grade |
Alloy Steel ASTM A691 Cl22, A691 GRADE 1 CR, GRADE 1/2 CR, GRADE 1 1/4 CR, GRADE 2 1/4 CR, |
Size |
1/2” NB to 36” NB |
Thickness |
3-12mm |
Schedules |
SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
Class Designation |
Class 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 34, 40, 41, 42, 43, 50, |
ASTM A691 Grades |
ASTM A691 Gr 11, ASTM A691 Gr.91, ASTM A691 9cr, ASTM A691 5cr, ASTM A691 1 1/4cr Cl22, ASTM A691m, |
Origin |
European, Japanese, Korean, US, Russian, Indian (Strictly No Chinese Material) |
Tolerance |
Cold drawn pipe: +/-0.1mm Cold rolled pipe: +/-0.05mm |
Craft |
Cold rolled and Cold drawn |
Type |
Seamless / ERW / Welded / Fabricated / LSAW Pipes |
available in Form of |
Round, Square, Rectangular, Hydraulic Etc. |
Length |
Standard |
End |
Plain End, Beveled End, Treaded |
Specialized in |
Large Diameter ASTM A691 Pipe |
Additional Testing |
NACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc. |
Application |
Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service |
ASTM A691 Pipe Chemical Composition
Chemical Composition of A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy STEEL EFW PIPEs
|
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, Aluminium 0.02 max, titanium 0.01 max, Zirconium 0.01 max.
ASTM A691 Pipe Equivalent
Pipe Grade |
Type of Steel |
ASTM Specification |
HB, max |
|
Number |
Grade |
|||
CM-65 |
carbon-molybdenum steel |
A204/A204M |
A |
201 |
CM-70 |
carbon-molybdenum steel |
A204/A204M |
B |
201 |
CM-75 |
carbon-molybdenum steel |
A204/A204M |
C |
201 |
CMSH-70 |
carbon-manganese-silicon steel, normalized |
A537/A537M |
1 |
|
CMS-75 |
carbon-manganese-silicon steel |
A299/A299M |
— |
— |
CMSH-80 |
carbon-manganese-silicon steel, quenched and tempered |
A537/A537M |
2 |
|
1/2 CR |
1/2 % chromium, 1/2 % molybdenum steel |
A387/A387M |
2 |
201 |
1 CR |
1 % chromium, 1/2 % molybdenum steel |
A387/A387M |
12 |
201 |
1 1/4 CR |
1 1/4 % chromium, 1/2 % molybdenum steel |
A387/A387M |
11 |
201 |
2 1/4 CR |
2 1/4 % chromium, 1 % molybdenum steel |
A387/A387M |
22 |
201 |
3 CR |
3 % chromium, 1 % molybdenum steel |
A387/A387M |
21 |
201 |
5 CR |
5 % chromium, 1/2 % molybdenum steel |
A387/A387M |
5 |
225 |
9 CR |
9 % chromium, 1 % molybdenum steel |
A387/A387M |
9 |
241 |
91 |
9 % chromium, 1 % molybdenum, vanadium, columbium |
A387/A387M |
91 |
241 |
A Class I is Other Than Killed with a specified minimum tensile strength of 450 MPa or lower.
Class II is Other Than Killed with a specified minimum tensile strength of 450 to 520 MPa incl.
Class III is Killed with a specified minimum tensile strength of 450 MPa or lower.
Class IV is Killed with a specified minimum tensile strength of 450 to 520 MPa incl.
Class V is Killed with a specified minimum tensile strength of over 520 MPa to but not including 655 MPa.
Class VI is Killed with a specified minimum tensile strength of 655 MPa or over.
B Full size (10 by 10 mm) specimens.
C Testing temperature as specified in the purchase order, but no higher than 0°C
ASTM A691 Pipe Mechanical Properties
A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy Steel EFW LSAW Pipes Class
Class |
Heat Treatment on Pipe Section see: |
Radiography, |
Pressure |
10 |
none |
none |
none |
11 |
none |
9 |
none |
12 |
none |
9 |
8.3 |
13 |
none |
none |
8.3 |
21 |
stress relieved, see 6.3.1 |
none |
none |
21 |
stress relieved, see 6.3.1 |
9 |
none |
ASTM A691 Class 22 |
stress relieved, see 6.3.1 |
9 |
8.3 |
23 |
stress relieved, see 6.3.1 |
none |
8.3 |
31 |
normalized, see 6.3.2 |
none |
none |
31 |
normalized, see 6.3.2 |
9 |
none |
32 |
normalized, see 6.3.2 |
9 |
8.3 |
33 |
normalized, see 6.3.2 |
none |
8.3 |
40 |
normalized and tempered, see 6.3.3 |
none |
none |
43 |
normalized and tempered, see 6.3.3 |
9 |
none |
43 |
normalized and tempered, see 6.3.3 |
9 |
8.3 |
43 |
normalized and tempered, see 6.3.3 |
none |
8.3 |
50 |
quenched and tempered, see 6.3.4 |
none |
none |
51 |
quenched and tempered, see 6.3.4 |
9 |
none |
52 |
quenched and tempered, see 6.3.4 |
9 |
8.3 |
53 |
quenched and tempered, see 6.3.4 |
none |
8.3 |
60 |
normalized and precipitation heat none none treated |
none |
none |
61 |
normalized and precipitation heat none none treated |
9 |
none |
62 |
normalized and precipitation heat none none treated |
9 |
8.3 |
63 |
normalized and precipitation heat none none treated |
none |
8.3 |
70 |
normalized and precipitation heat none none treated |
none |
none |
71 |
normalized and precipitation heat none none treated |
9 |
none |
72 |
normalized and precipitation heat none none treated |
9 |
8.3 |
73 |
normalized and precipitation heat none none treated |
none |
8.3 |
Heat Treatment of A691 Material
Pipe Grade |
ASTM Specification |
Post-Weld Heat-Treat Temperature Range (Stress Relieving), °F (°C) |
Normalizing Temperature max unless otherwise noted, |
Quenching Temperature max unless otherwise noted,°F (°C) |
Tempering Temperature, min, °F (°C) |
CM-65 |
A 204/A 204M |
1100 to 1200 (590 to 650) |
1700 (925) |
… |
… |
CM-70 |
A 204/A 204M |
1100 to 1200 (590 to 650) |
1700 (925) |
… |
… |
CM-75 |
A 204/A 204M |
1100 to 1200 (590 to 650) |
1700 (925) |
… |
… |
CMSH-70 |
A 537/A 537M |
1100 to 1200 (590 to 650) |
1700 (925) |
… |
… |
CMS-75 |
A 299/A 299M |
1100 to 1200 (590 to 650) |
1700 (925) |
… |
… |
CMSH-80 |
A 537/A 537M |
1100 to 1200 (590 to 650) |
A |
1700( 925) |
1100 to 1250 (590 to 675) |
1/2CR |
A 387/A 387M |
1100 to 1300 (590 to 705) |
1850 (1010) |
1700( 925) |
150 to 1375 (620to745) |
1CR |
A 387/A 387M |
1100 to 1350 (590 to 730) |
1850 (1010) |
1700 (925) |
150 to 1375 (620to745) |
11⁄4CR |
A 387/A 387M |
1100 to 1375 (590 to 745) |
1850 (1010) |
1700 (925) |
150 to 1375 (620to745) |
21⁄4CR |
A 387/A 387M |
1200 to 1400 (650 to 760) |
1850 (1010) |
1700 (925) |
250 to 1400(675 to760) |
3CR |
A 387/A 387M |
1200 to 1400 (650 to 760) |
1850 (1010) |
1700 (925) |
250 to1400 (675 to760) |
5CR |
A 387/A 387M |
1200 to 1400 (650 to 760) |
1850 (1010) |
1650 (900) |
1300 to1400 (705 to760) |
9CR |
A 387/A 387M |
1325 to 1375 (715 to 745) |
B |
… |
1325 to1375 (715 to745) |
ASTM A691 Gr.91 |
A 387/A 387M |
1350 to 1420 (730 to 770) |
11900 to 2000 (1040 to 1095) |
1900 min (1040 min) |
1350 to 1440 (730 to 780) |
Tensile Requirements of A691 Pipe
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 |
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 |
– |