ASTM A672 C70 CL22 EFW Pipes description
ASTM A672 C70 CL22 is a medium- and high-pressure carbon steel pressure-bearing welded pipe conforming to American standards:
C70: Material grade (carbon manganese steel with a minimum yield strength of 485 MPa/70 ksi).
CL22: Manufacturing and inspection grade (Class 22), a medium- to high-level quality control standard.
Process: Manufactured using submerged arc welding (SAW) or electrofusion welding (EFW), with forced normalizing treatment to ensure high-temperature performance.
ASTM A672 gr c70 cl22 pipe Chemical Composition
|
Specification |
Steel grade |
Chemical composition |
Remarks |
|||||
|
C |
Si |
Mn |
P |
S |
Ti |
|||
|
Pipes for pressure service ASTM A671, A672 |
CC70/C70 |
0.27 |
0.13 ~0.45 |
0.79 ~1.30 |
0.035 |
0.035 |
- |
A671/ A672 |
A672 Grade C70 22 Pipes Mechanical Properties
|
Products |
Steel Grade |
BASE METAL MECHANICAL COMPOSITION |
Welding point tensile strength (N/mm2) |
Remarks |
|||
|
Yield point (N/mm2) |
Tensile Stregth (N/mm2) |
Test Pieces |
Elongation (%) |
||||
|
Pipes for pressure service ASTM A671, A672 |
CC70/C70 |
260 |
485~620 |
- |
21 |
485~620 |
A671/ A672 |
Applications
CL22-grade pipes are engineered for medium-high pressure and elevated temperature non-extreme service conditions. Key sectors include:
1. Petrochemical Engineering
Refineries:
Piping for Hydrodesulfurization (HDS) units (Pressure ≤15 MPa, Temperature ≤350°C)
Ethylene Plants:
Medium-pressure steam transmission lines (2.5–6.4 MPa, 300–400°C)
2. Power & Energy
Thermal Power Plants:
Boiler feedwater pipelines (Pressure ≤12 MPa, Temperature ≤250°C)
Gas Turbines:
Heat exchange tubes in waste heat recovery systems
3. Industrial Systems
Fertilizer Plants:
Piping for syngas compressor units
Air Separation Units:
Medium-pressure nitrogen transfer pipes
Test and inspection
Packaging and shipping
