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.
| Standard | ASTM A691 | ||||||
| Application Field | Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures | ||||||
| Steel Grade | Alloy 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 | ||||||
| Class | Class 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 Process | EFW,ERW,SEAMLESS,LSAW | ||||||
| Demension | 1/2”- 36” | ||||||
| Wall Thickness | SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS | ||||||
| Length | R1,R2,5.8M,6M,12M or customer’s request | ||||||
| OD Tolerance | +/- 0.5 % | ||||||
| WT Tolerance | less than 0.01in | ||||||
| Length Tolerance | less than -0,+1/2in | ||||||
| Corrosion Prevention | Bare,Painting black,varnished,galvanized,anti-corrosion,PE PP/EP/FBE coating | ||||||
| Pipe End | PE,BE,Grooved,Thread,Coupling | ||||||
| Technical Method | Hot-rolled/Cold-drawn/Hot-expanded | ||||||
| Chemical Composition | 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 | 0.02 | |
| S | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.01 | |
| Si | 0.15-0.40 | 0.50-0.80 | 0.5 | 0.5 | 1 | 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 | |
ASTM A691 Dimension Table
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 Grade | Type of Steel | ASTM Specification | HB , maxA | |
|---|---|---|---|---|
| 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 |
| 1CR | 1% chromium ,1/2% molybdenum steel | A387/A387M | 12 | 201 |
| 1-1/4 CR | 11/4% chromium ,1/2% molybdenum steel | A387/A387M | 11 | 201 |
| 2-1/4 CR | 21/4% chromium ,1% molybdenum steel | A387/A387M | 22 | 201 |
| 3CR | 3% chromium ,1% molybdenum steel | A387/A387M | 21 | 201 |
| 5CR | 5% chromium ,1/2% 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 | 91B | 241 |
| 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 Grade | Type of Steel | ASTM Specification | HB , maxA | |
|---|---|---|---|---|
| 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 |
| 1CR | 1% chromium ,1/2% molybdenum steel | A387/A387M | 12 | 201 |
| 1-1/4 CR | 11/4% chromium ,1/2% molybdenum steel | A387/A387M | 11 | 201 |
| 2-1/4 CR | 21/4% chromium ,1% molybdenum steel | A387/A387M | 22 | 201 |
| 3CR | 3% chromium ,1% molybdenum steel | A387/A387M | 21 | 201 |
| 5CR | 5% chromium ,1/2% 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 | 91B | 241 |
| 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.
- CM-65
- CM-70
- CM-75
- CMSH-70
- CMS-75
- CMSH-80
- 1/2 CR
- 1CR
- 1 1/4 CR
- 2 1/4 CR
- 3CR
- 5CR
- 9CR
- 91
