What is ASTM A671 CC70
ASTM A671 CC70 refers to CC70 grade carbon steel welded steel pipe that complies with the American Society for Testing and Materials (ASTM) standard A671. The following is a detailed introduction to the standard:
ASTM A671 Standard Overview
ASTM A671 standard is used for welded steel pipes, covering a series of different grades and types of carbon steel and alloy steel welded pipes, which are widely used in oil, gas, chemical, construction and other fields.
Characteristics of Grade CC70
Chemical composition: CC70 grade steel contains 0.24% to 0.30% carbon, as well as appropriate amounts of manganese and silicon.
Mechanical properties: It has high yield strength and tensile strength, suitable for structural parts subjected to greater pressure.
Low temperature performance: According to GB/T 6479 standard, -20℃ low temperature impact test is carried out to meet specific low temperature use requirements.
In summary, ASTM A671 CC70 is a high-quality welded steel pipe suitable for a variety of industrial fields, especially those occasions with high requirements for material properties.
ASTM A671 CC70 pipe Heat treatment parameters
|
Steel Pipe Grade |
ASTM Standard |
Post-weld heat treatment Temperature (stress relief) °F (°C) |
Normalizing temperature max Except where otherwise specified °F (°C) |
Quenching temperature max Except where otherwise specified °F (°C) |
Tempering temperature min °F (°C) |
Precipitation hardening Heat treatment temperature °F (°C) |
| CC 70 | A516/A516M(70) |
1100～1200 (590～650) ⓒ |
1700 (925) |
1700 (925) |
1100 (590) ⓓ |
- |
|
ⓐ "-" in the table indicates no requirement. ⓑ The number in the grade indicates the minimum tensile strength in ksi. ⓒ In any case, the post-weld heat treatment temperature cannot be higher than the tempering temperature of the steel mill. ⓓ If rapid cooling is used according to A516/A516M standards, the tempering temperature is 1100 ~ 1300℉ (590 to 705℃). |
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