What is A671 CC60 CL 22 material?
The ASTM A671 GR CC60 CL22 steel pipe is an electric fusion welding (EFW) steel pipe, mainly used in industries such as power generation, petrochemicals, oil, and natural gas.
astm a671 gr cc60 specification
| Type | A671 GR CC65 EFW pipe |
| Standard | ASME,ASTM,JIS,DIN,BS,EN |
| Size | 16"NB-72"NB |
| Wall Thickness | 6mm to 100mmTHK |
| Additional Testing | NACE MR0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, etc. |
astm a671 gr cC60 chemical composition
| Specification | Steel grade | Chemical composition | Remarks | |||||
| C | Si | Mn | P | S | Ti | |||
| Pipes for pressure service ASTM A671 | -/A45 | -/0.17 | - | 0.98 | 0.035 | 0.035 | - | A671 |
| -/A50 | -/0.22 | - | ||||||
| CA55/A55 | 0.28 | - | ||||||
| -/B55 | -/0.20 | 0.13 ~0.45 | ||||||
| CB60/B60 | 0.24 | |||||||
| CB65/B65 | 0.28 | |||||||
| CB70/C70 | 0.31 | 1.30 | ||||||
| -/C55 | -/0.18 | 0.55 ~0.98 | ||||||
| CC60/C60 | 0.21 | |||||||
| CC65/C65 | 0.24 | 0.79 ~1.30 | ||||||
| CC70/C70 | 0.27 | |||||||
A671 CC65 V.S A671 CC60
| Characteristic | A671 CC65 | A671 CC60 |
|---|---|---|
| Carbon Content | Higher carbon content (typically up to 0.25% - 0.27% or as specified, but generally higher than CC60) | Lower carbon content, controlled below 0.3% (specifically designed for medium-low carbon steel) |
| Strength | Generally higher tensile and yield strength due to higher carbon content | Tensile strength ≥ 415 MPa, yield strength ≥ 240 MPa (as per standard specifications) |
| Toughness | Good toughness, but may vary depending on exact carbon content and heat treatment | Better low-temperature toughness, suitable for colder environments (though both are designed for specific service conditions) |
| Applications | Suitable for high-pressure and high-temperature services in industries like oil and gas, petrochemicals, and power generation where higher strength is required | Primarily used in similar industries but where medium-low carbon steel with good weldability and low-temperature toughness is sufficient |
| Weldability | Weldability may be slightly reduced compared to lower carbon grades, but still acceptable | Excellent weldability due to lower carbon content |
| Service Temperature | Designed for general high-temperature and high-pressure services (exact minimum service temperature may vary) | CL22 grade specifically designed for minimum service temperature of -45°C, suitable for extremely cold environments |
A671 CC60 EFW Pipe Production Process and Technical Challenges
Plate Preprocessing
Hot-rolled coil is used as the raw material, and processes such as leveling and edge milling are employed to ensure the precision of the plate edges. The plates must comply with ASTM A516 Gr.60 or equivalent standards, with thickness deviation controlled within ±0.1mm.
Forming and Welding
The plates are rolled into tubular shapes using the JCOE (progressive bending forming) or UOE (die forming) process, and longitudinal seams are welded using submerged arc welding with multiple wires (SAWL). The following parameters need to be precisely controlled during the welding process:
Current and voltage: For twin-wire welding, the main wire current ranges from 500 to 700A, while the auxiliary wire current ranges from 300 to 450A.
Welding speed: 1.2-1.8m/min.
Shielding gas: A mixture of 80% Ar and 20% CO₂.
Heat Treatment and Inspection
After welding, the entire pipe must undergo normalizing treatment (holding at 900-930°C for 30 minutes) to eliminate welding residual stresses. The finished product must pass a hydrostatic test (at 1.5 times the design pressure), hardness test (≤250HB), and Charpy V-notch impact test (with an average value ≥27J at -45°C).
A671 CC60 Carbon Steel Welded Pipes Factory
