Here’s a detailed technical specification for ASTM A672 Grade C60 Clase 32 Welded Pipes:
1. Material Specification
– Standard: ASTM A672 (Electric-Fusion-Welded Steel Pipe for High-Pressure Service)
– Grade: C60 (Minimum Yield Strength = 415 MPa/60 ksi)
– Class: 32 (Wall Thickness Category)
– Type: Longitudinal or Spiral Welded Construction
2. Chemical Composition (%)
| Element | C (max) | Mn | P (max) | S (max) | Si | Ni | Cr | Mo | Cu |
|———|———|—-|———|———|—-|—-|—-|—-|—-|
| Content | 0.22 | 0.90-1.50 | 0.025 | 0.025 | 0.15-0.40 | 0.40 | 0.30 | 0.12 | 0.35 |
3. Mechanical Properties
| Property | Yield Strength (min) | Tensile Strength | Elongation (min) | Impact Test* |
|———-|———————-|——————|——————|————–|
| Value | 415 MPa (60 ksi) | 485-655 MPa | 18% | 27J @ -46°C |
Required when specified for low-temperature service
4. Manufacturing Process
– Welding Method: Electric Fusion Welding (EFW) with filler metal
– Heat Treatment: Full Normalization or Stress Relieving
– NDT: 100% Radiographic or Ultrasonic Testing of welds
– Hydrostatic Test: Minimum 1.5x design pressure
5. Dimensional Characteristics
– Size Range: Typically 16″ (406mm) OD and larger
– Wall Thickness:
– Class 32 corresponds to approximately 32mm (1.26″) nominal wall
– Actual thickness varies by diameter (per ASME B36.10M)
– Lengths: Up to 12.2m (40ft) standard, custom lengths available
6. Temperature Service Range
– Design Temperature: -29°C to 343°C (-20°F to 650°F)
– Low-Temp Service: Suitable for -46°C (-50°F) with impact testing
7. Applications
– Power plant high-pressure steam lines
– Petrochemical processing piping
– Gas transmission systems
– Refinery service
– Cryogenic applications (with proper impact testing)
8. Certification & Testing
– Mill Test Certificate per EN 10204 3.1
– Optional supplementary tests:
– Hardness Testing
– PMI (Positive Material Identification)
– SSC Testing (NACE MR0175)
9. Comparison with Other Grades
Compared to Class 12 pipes:
– Class 32 has ~2.5x greater wall thickness
– Same chemical/mechanical properties as Grade C60
– Requires different welding procedures for field joints
10. Special Notes
– Post-weld heat treatment recommended for critical services
– Not recommended for severe cyclic service without FEA analysis
– Available with internal/external coatings (FBE, 3LPE, etc.)
This specification is typically used for high-pressure, high-reliability applications where thick-walled pipe is required for mechanical strength and safety factors. The Class 32 designation makes it suitable for extreme pressure applications in power generation and hydrocarbon processing.
