ASTM A691 1 CR Steel Pipe description
ASTM A691 1 CR steel pipe is a type of alloy steel pipe that conforms to the ASTM A691 standard, with "1 CR" indicating that it contains approximately 1% chromium (Cr).
Standard Compliance:
ASTM A691 is a specification for electric-fusion-welded steel pipe suitable for high-pressure service at moderate temperatures. This standard covers a range of grades, each with different chemical compositions and mechanical properties to suit various applications.
Material Composition:
The "1 CR" designation means that the steel pipe contains about 1% chromium. Chromium is added to enhance the steel's corrosion resistance, high-temperature strength, and oxidation resistance.
Depending on the specific grade within the ASTM A691 standard, other elements such as molybdenum (Mo) may also be present to further improve the pipe's performance characteristics.
Key Properties:
Corrosion Resistance: The chromium content helps form a protective oxide layer on the surface of the steel, which improves its resistance to corrosion in various environments.
High-Temperature Performance: The addition of chromium and other alloying elements enhances the pipe's ability to maintain its strength and structural integrity at elevated temperatures.
Mechanical Strength: ASTM A691 1 CR steel pipe is designed to have good tensile strength, yield strength, and toughness, making it suitable for high-pressure applications.
A691 Grade 1Cr Chemical Analysis:
|
Designation |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
|
ASTM A691 1Cr |
0.05-0.17 |
0.40- 0.65 |
0.035 |
0.035 |
0.50-0.80 |
1.00-1.50 |
0.45-0.65 |
A691 Grade1Cr Physical Property:
|
Designation |
Tensile strength ksi [MPa] |
Yield strength, min ksi [MPa] |
Elongation in 8 in. [200mm], min % |
|
ASTM A691 Grade1 Cr |
65300 - 84800 [450 - 585] |
39900 [275] |
22 |
Manufacturing Process:
This type of steel pipe is typically manufactured using electric fusion welding (EFW), which involves melting the edges of the steel plate and pressing them together to form a weld.
The manufacturing process is closely controlled to ensure that the pipe meets the required specifications for chemical composition, mechanical properties, and dimensional accuracy.
Applications:
ASTM A691 1 CR steel pipe is commonly used in industries such as oil and gas, petrochemical, and power generation, where high-pressure service at moderate temperatures is required.
It is suitable for applications such as steam pipelines, high-pressure water lines, and other fluid transport systems where corrosion resistance and high-temperature performance are important.
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