aSTM A691

LSAW-PIPE-MILL-MS-PIPE-MILL-ON-PRODUCTION-LINE-gost-10706-ASTM-A691

ASTM A691 Steel Pipe

At UNIACERO, we pride ourselves on offering the highest quality ASTM A691 Chrome Moly Electric Fusion Welded (EFW) Pipes. These pipes are meticulously designed for high-pressure service at elevated temperatures. Fabricated from a pressure-vessel-quality plate, our ASTM A691 pipes are electric-fusion-welded with added filler metal, ensuring durability and reliability for your projects. With our expertise, you can trust that you’re getting a product that meets international standards and is suitable for the most demanding applications.

ASTM A691 Specification

Our ASTM A691 pipes come with a range of specifications to meet your project needs. These pipes are fabricated from pressure-vessel-quality plates of various analyses and strength levels. They can be heat treated to achieve desired mechanical properties or to comply with specific code requirements. The pipes are available in diameters of 16 inches or larger, with wall thicknesses up to 3 inches. The welding process involves the deposition of filler metal, either manually or automatically, ensuring strong and durable joints. Moreover, we offer various end types, surface coatings, joint methods, and machining services to cater to your specific requirements.

StandardASTM A691
Application FieldStandard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for
High-Pressure Service at High Temperatures
Steel GradeAlloy Steel ASTM A691 Cl22,1 CR,1/2 CR,1 1/4 CR,2 1/4 CR, 3 CR,5 CR,9 CR,91,CM 65,CM70,CM75
ClassClass 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 34, 40, 41, 42, 43, 50, 51, 52, 53, 60, 61, 62, 63, 70, 71, 72, 73..
Manufacturing ProcessEFW,ERW,SEAMLESS,LSAW
Demension1/2”- 36”
Wall ThicknessSCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS
LengthR1,R2,5.8M,6M,12M or customer’s request
OD Tolerance+/- 0.5 %
WT Toleranceless than 0.01in
Length Toleranceless than -0,+1/2in
Corrosion PreventionBare,Painting black,varnished,galvanized,anti-corrosion,PE PP/EP/FBE coating
Pipe EndPE,BE,Grooved,Thread,Coupling
Technical MethodHot-rolled/Cold-drawn/Hot-expanded
Chemical Composition 1CR1-1/4CR2-1/4 CR5 CR9 CR91
C0.05-0.170.05-0.170.05-0.150.150.150.08-0.12
Mn0.40-0.650.40-0.650.30-0.600.30-0.600.30-0.600.30-0.60
P0.0250.0250.0250.0250.0250.02
S0.0250.0250.0250.0250.0250.01
Si0.15-0.400.50-0.800.50.510.20-0.50
Cr0.80-1.151.00-1.502.00-2.504.00-6.008.00-10.008.00-9.50
Mo0.45-0.600.45-0.650.90-1.100.45-0.650.90-1.100.85-1.05
V0.040.18-0.25

ASTM A691 Dimension Table

schematic-diagram-of-pipe-dimension

Our ASTM A691 pipes are available in a variety of dimensions to suit diverse applications. They nominally cover pipes 16 inches [400 mm] in outside diameter and larger, with wall thicknesses up to 3 inches [75 mm] inclusive. However, we can provide pipes with other dimensions, ensuring they meet all other requirements of the ASTM A691 specification. With our dimension table, you can easily select the perfect size for your project, ensuring efficiency and precision in your operations.

Outside Diameter:16 in. [405mm] or larger
Wall Thickness:up to 3 in. [75 mm]
Pipe having other dimensions may be furnished provided it complies with all other requirements of this specification.

Chemical Requirements of ASTM A691

At UNIACERO, we adhere to strict chemical requirements for our ASTM A691 pipes. The pipe manufacturer conducts a thorough analysis of each mill heat of plate material, ensuring that the product meets the requirements of the plate specification. Additionally, an analysis of the finished deposited weld material is performed for every 200 feet or fraction thereof. This rigorous testing ensures that our pipes are of the highest quality and meet international standards.

Pipe GradeType of SteelASTM SpecificationHB , maxA
NumberGrade
CM -65carbon – molybdenum steelA204/A204MA201
CM -70carbon – molybdenum steelA204/A204MB201
CM -75carbon – molybdenum steelA204/A204MC201
CmSH -70carbon – manganese – silicon steel , normalizedA537/A537M1
CMS -75carbon – manganese – silicon steelA299/A299M
CMSH -80carbon – manganese – silicon steel , quenched and temperedA537/A537M2
1/2 CR1/2% chromium ,1/2% molybdenum steelA387/A387M2201
1CR1% chromium ,1/2% molybdenum steelA387/A387M12201
1-1/4 CR11/4% chromium ,1/2% molybdenum steelA387/A387M11201
2-1/4 CR21/4% chromium ,1% molybdenum steelA387/A387M22201
3CR3% chromium ,1% molybdenum steelA387/A387M21201
5CR5% chromium ,1/2% molybdenum steelA387/A387M5225
9CR9% chromium ,1% molybdenum steelA387/A387M9241
919% chromium ,1% molybdenum , vanadium , columbiumA387/A387M91B241
A Hardness values listed are applicable to S3.
BGrade 91 shall be designated by Type 1 or Type 2 when required by the prevalent specification .

 

Mechanical Requirements of ASTM A691

Our ASTM A691 pipes are designed to meet stringent mechanical requirements. Depending on the grade and class, the pipes undergo various heat treatments, including stress-relieving, normalizing, and quenching and tempering. This ensures that the pipes have the desired mechanical properties, making them suitable for high-pressure service at high temperatures. With our pipes, you can be confident in the mechanical integrity of your installations.

Pipe GradeType of SteelASTM SpecificationHB , maxA
NumberGrade
CM -65carbon – molybdenum steelA204/A204MA201
CM -70carbon – molybdenum steelA204/A204MB201
CM -75carbon – molybdenum steelA204/A204MC201
CmSH -70carbon – manganese – silicon steel , normalizedA537/A537M1
CMS -75carbon – manganese – silicon steelA299/A299M
CMSH -80carbon – manganese – silicon steel , quenched and temperedA537/A537M2
1/2 CR1/2% chromium ,1/2% molybdenum steelA387/A387M2201
1CR1% chromium ,1/2% molybdenum steelA387/A387M12201
1-1/4 CR11/4% chromium ,1/2% molybdenum steelA387/A387M11201
2-1/4 CR21/4% chromium ,1% molybdenum steelA387/A387M22201
3CR3% chromium ,1% molybdenum steelA387/A387M21201
5CR5% chromium ,1/2% molybdenum steelA387/A387M5225
9CR9% chromium ,1% molybdenum steelA387/A387M9241
919% chromium ,1% molybdenum , vanadium , columbiumA387/A387M91B241
A Hardness values listed are applicable to S3.
BGrade 91 shall be designated by Type 1 or Type 2 when required by the prevalent specification .

 

Steel Grades in ASTM A691

We offer ASTM A691 pipes in a variety of steel grades, including ASTM A691 Gr 11, ASTM A691 Gr.91, ASTM A691 9cr, and many more. Each grade designates the type of plate used, ensuring that the pipes have the desired properties for specific applications. Whether you need pipes for high-temperature service or other demanding conditions, we have a grade that will meet your needs.

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

Application Scenarios

Our steel pipes are engineered to withstand high temperatures, corrosive environments, and varying pressures, ensuring reliability and safety in the complex petrochemical processes. 

Whether it’s transferring crude oil, natural gas, or chemical intermediates, the robustness and versatility of steel pipes make them indispensable components of the plant’s infrastructure, contributing to efficient production and maintenance of stringent safety standards.

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