ASTM A671 CC70 Carbon Steel EFW Pipe
What is the ASTM A671 grade?
ASTM A671 grades cover standard specifications for EFW pipe with added filler metal. The primary composition of ASTM A671 pipe is 0.98 manganese, 0.25 maximum carbon, 0.64 molybdenum, and 0.45 silicon. ASTM A671 CC70 carbon steel EFW (Electric Fusion Welded) pipe is a carbon steel pipe manufactured using the electrofusion welding (EFW) process. The ASTM A671 standard is specifically designed to specify the requirements for electrofusion welded steel pipe, typically used in high temperature and pressure applications. CC70 refers to the grade of steel pipe, which is related to the mechanical properties of the steel pipe.
A671 CC70 EFW pipe is commonly used to transport fluids, especially where higher temperatures and pressures are required. It is widely used in oil and natural gas transportation, water treatment, chemical process pipelines, thermal power stations and other fields.
ASTM A671 Gr CC70 pipe Heat Treatment Parameters
| Pipe Grade | ASTM Specification and Grade | Post-Weld Heat-Treatment Temperature Range °F(°C) | Normalizing Temperature, max, °F(°C) | Quenching Temperature max, °F(°C) | Tempering Temperature min, °F(°C) |
|---|---|---|---|---|---|
| ASTM A671 CC 70 | A 516/A 516M (70) | 1100-1250 (590-680) | 1750 (925) | 1650 (900) | 1200 (650) |
ASTM A671 Gr CC70 EFW Pipe Chemical Composition:
| Steel grade | Chemical composition | |||||
|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Ti | |
| CC70/C70 | 0.27 | 0.13 ~0.45 |
0.79 ~1.30 |
0.035 | 0.035 | - |
ASTM A671 Gr CC70 Electric fusion welded pipe Mechanical Properties:
| Steel Grade | BASE METAL MECHANICAL COMPOSITION | Welding point tensile strength (N/mm2) | ||
|---|---|---|---|---|
| Yield point (N/mm2) | Tensile Stregth (N/mm2) | Elongation (%) | ||
| CC70/C70 | 260 | 485~620 | 21 | 485~620 |
Straight seam welded pipe
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