Your ASTM A691 EFW Steel Pipe manufacturer in China

LONGMA 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
  • Class: 20, 21, 22, 30, 40, 50
  • Out Diameter: 60.3-660.4mm(2″-26″)
  • Wall Thickness: 4-25.4mm
  • Length: 3-18 meters
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Our ASTM A691 EFW Steel Pipe Product List

Longma is one of the leading ASTM A691 1Cr, 1 1/4Cr, 2 1/4Cr CL22 EFW pipes manufacturer since 2003

ASTM A691 GR 1 1/4 Cr Cl22 EFW Steel Pipe

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ASTM A691 2-1/4 Cr Class 22 Pipe

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ASTM A691 Grade 1.25Cr Alloy Steel Pipe

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ASTM A691 Chrome Moly EFW Steel Pipe

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ASTM A691 EFW Carbon And Alloy Steel Pipe

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ASTM A691 High Quality Steel Pipe

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Longma is one of the leading ASTM A691 1Cr, 1 1/4Cr, 2 1/4Cr CL22 EFW pipes manufacturer since 2003

  • Foundin 2003, specialized in produce ERW, LSAW, DSAW steel pipes with an annual output of 300,000 tons.
  • Two factories, 200,000 square meters of plant.
  • Advanced production equipment imported from Germany, 16 JCO production lines.
  • More than 300 employees and more than 60 technicians provide efficient production operations and technical services.
  • API 5L(No. 5L-0685, Expiration date: 16th,Nov,2024), ISO9001, ISO14001, ISO18001, FPC certificates.
  • Exports high quality steel pipes to more than 60 countries around the world.
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ASTM A691 EFW Steel Pipe Production Line

Annual output of 300,000 tons of LSAW steel pipes, with out diameter Φ406mm- 1626mm (16″ – 64″), wall thickness 6.0mm- 75mm (1/4″ – 3″), length 18 meters max.

X-Ray Testing

Ultrasonic Testing

Tack Welding

Plate Ultrasonic Testing

Pipe Forming

Pipe End Bevelling

Mechanical Expansion

Hydrostatic Pipe Testing

Our Advantages For ASTM A691 EFW Steel Pipe

Complete Specifications

Out diameter up to 1422mm, and wall thickness up to 100mm, length up to 18 meters, it can cover the needs of most projects.

Good Quality

Complete quality inspection process and inspection equipments, each steel pipe has a unique code can be traced.

Fast Delivery

Our two factory areas, 16 production lines and multi -specifications of circular production. Fastest delivery time 7 days.

Quick Quotation

Dozens of professional salesmen are responsible for customers in different regions, and can provide accurate quotes within as soon as 1 hour.

Accept Small Quantity Order

Tens of thousands of tons of steel pipe inventory can meet your minimum 1 steel pipe needs.

Complete Certificate

API 5L, ISO9001, ISO14001, ISO18001, FPC, etc. While ensuring product quality, it can help you get more orders.

Technical Data For STM A691 EFW Steel Pipe

Class Designates
Plate Materials
Heat Treatment Parameters
Chemical Composition
Mechanical Property
Tolerance
Class Heat Treatment on Pipe Radiography, see Section Pressure Test, see Section
10 none none none
11 none 9 none
12 none 9 8.3
13 none none 8.3
20 stress relieved, see 5.3.1 none none
21 stress relieved, see 5.3.1 9 none
22 stress relieved, see 5.3.1 9 8.3
23 stress relieved, see 5.3.1 none 8.3
30 normalized, see 5.3.2 none none
31 normalized, see 5.3.2 9 none
32 normalized, see 5.3.2 9 8.3
33 normalized, see 5.3.2 none 8.3
40 normalized and tempered, see 5.3.3 none none
41 normalized and tempered, see 5.3.3 9 none
42 normalized and tempered, see 5.3.3 9 8.3
43 normalized and tempered, see 5.3.3 none 8.3
50 quenched and tempered, see 5.3.4 none none
51 quenched and tempered, see 5.3.4 9 none
52 quenched and tempered, see 5.3.4 9 8.3
53 quenched and tempered, see 5.3.4 none 8.3
Pipe Grade Type of Steel ASTM Specification HB, max A
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
½ CR ½% chromium, ½% molybdenum steel A387/A387M 2 201
1CR 1% chromium, ½% molybdenum steel A387/A387M 12 201
1 ¼CR 1 ¼% chromium, ½% molybdenum steel A387/A387M 11 201
2 ¼CR 2 ¼% chromium, 1% molybdenum steel A387/A387M 22 201
3CR 3% chromium, 1% molybdenum steel A387/A387M 21 201
5CR 5% chromium,½% molybdenum steel A387/A387M 5 225
9CR 9% chromium, 1% molybdenum steel A387/A387M 9 241
91 9% chromium, 1% molybdenum, vanadium, columbium A387/A387M 91 241
A Hardness values listed are applicable to S3.
Pipe Grade ASTM
Specification Post-Weld Heat-Treat
Temperature Range (Stress carbon-molybdenum steel
Relieving), °F (°C) Normalizing
Temperature, carbon-molybdenum steel
max unless carbon-manganese-silicon steel, normalized
otherwise noted, carbon-manganese-silicon steel
°F (°C) Quenching
Temperature, ½% chromium, ½% molybdenum steel
max unless 1% chromium, ½% molybdenum steel
otherwise noted, 1 ¼% chromium, ½% molybdenum steel
°F (°C) Tempering Temperature,
min, °F (°C) 3% chromium, 1% molybdenum steel
CM-65 A204/A204M
CM-70 A204/A204M
CM-75 A204/A204M
CMSH-70 A537/A537M
CMS-75 A299/A299M
CMSH-80 A537/A537M
½ CR A387/A387M
1 CR A387/A387M
1 ¼CR A387/A387M
2 ¼CR A387/A387M
3CR A387/A387M
5CR A387/A387M
9CR A387/A387M
91 A387/A387M
min] 1350 to 1440 [730 to 780]
% 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

Outside diameter +/- 0.5%
Out of roundness The difference between major and minor outside diameters 1%.
Alignment Using a 10-ft 3m straightedge placed so that both ends are in contact with the pipe, 1/8in. 3mm.
Thickness Minimum wall thickness at any point in the pipe shall not be more than 0.01 in 0.3mm under the specified nominal thickness.
Lengths Lengths with unmachined ends shall be within -0, +1/2 inch, 0 +13mm of that specified. Lengths with machined ends shall be as agreed between manufacturer and purchaser.
FAQs

Frequently Asked Questions​

Here are some common questions and answers. If you still have questions, don’t hesitate to contact us.

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  • 1. What is ASTM A691?

    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.

  • 2. What is ASTM A691 1-1/4 CR CL 22?

    ASTM A691 Grade 1-1/4 CR Class 22 Pipe comes under the A691 specification. This specification covers alloy steel pipes and carbon steel pipes that are fusion welded with filler materials. The pipes can also be fabricated from pressure vessel quality sheets.

  • 3. What grades are included in the A691 standard?

    The standard ASTM A691 is included grade CM-65, CM-70, CM-75, CMSH-70,CMS-75, CMSH-80, 1/2 CR, 1 CR, 1 1/4 CR, 2 1/4 CR, 3CR, 5CR, 9CR, 91.

  • 4. What is the composition of ASTM A691?

    The ASTM A691 Pipe is made with a composition of chromium, molybdenum, carbon, manganese, phosphorous, silicon, and sulfur. These pipes possess excellent corrosion and oxidation resistance properties. The ASTM A691 Gr 11 Welded Pipe is formed after welding steel with the help of a filler.

  • 5. What areas can ASTM A691 steel pipe be used for?

    ASTM A691 Alloy Steel Seamless Pipe is intended for high temperature administration use and they are utilized in different applications like HVAC and Firefighting, Hydro Carbon Processes, Plumbing, Sewage and Waterwell, Oil and Gas, and so forth.

  • 6. What is ASTM A691 2-1/4CR pipe?

    ASTM A691 2-1/4CR pipe refers Chrome Moly Welded Pipe used for high temperature and high pressure services. These pipes are manufactured in Electric-Fusion-Welded process, and fabricated with Chrome Moly Steel Plate in ASTM A387 Grade 22. ASTM A691 2-1/4CR pipes has Chrome content 2% to 2.5%, Moly 0.9% to 1.1%. This material equivalent to seamless pipe in ASTM A335 P22 pipe, and also could be made to fittings like elbws, bends, tees, reducers etc.

Featured Case For ASTM A691 EFW Steel Pipe

API 5L PSL2 X70M LSAW Pipe

  • Size: 914.4*22.23*12000MM
  • Country: Agentina
  • Client say: This is not our first cooperation, Longma’s product quality and service has always been very good, which is the reason why we continue......

APL 5L PSL1 B LSAW Pipe

  • Size: 813*10mm
  • Country: Georgia
  • Client say: The delivery time I asked for was very short, but they always finished on time. They have very strong organizational and coordination skills.
  • ......

EN10210 S355J2H Hollow Section

  • Size: 815mm*100mm
  • Country: Poland
  • Client say: The steel pipes I purchased are used for equipment manufacturing and special engineering, which have extremely strict requirements for product quality. The production......

ASTM A691 1-1/4Cr Cl22 EFW Steel Pipe

  • Size: 508*20.62mm
  • Country: Singapore
  • Client say: Although our order quantity is not large, Longma has been very diligent to help us complete the production and provide relevant documents.

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