ASTM A671 CC70
UNS K02700ASTM A671 CC70 material
Key Engineering Metrics
Instant specifications summary for ASTM A671 CC70
General Specifications & Standard Data
ASTM A671Minimum Design Metal Temperature rules for impact testing exemption under ASME B31.3 paragraph 323.2.2.
Mechanical Properties
Room Temp (20°C / 68°F)Allowable Stress Data (ASME B31.3 Table A-1)
asme-b31-3Allowable Stress vs Temperature
ASME B31.3 / BPVC Section II Part D Reference Curve
| Temperature (°C) | Allowable Stress (MPa) | % of Room Temp Rating |
|---|---|---|
| 38 | 137.9 | 100% |
| 100 | 137.9 | 100% |
| 150 | 137.9 | 100% |
| 200 | 131.0 | 95% |
| 250 | 122.0 | 88% |
| 300 | 115.0 | 83% |
| 350 | 112.0 | 81% |
| 400 | 108.0 | 78% |
| 450 | 105.0 | 76% |
| 500 | 102.0 | 74% |
Chemical Composition (% Weight)
Heat & Product Analysis🛡️ Service Compatibility
Impact tested down to -45°C (-50°F). Standard for LPG, cold hydrocarbons & cold climates.
Ideal for low-temp oil & gas process lines.
Suitable for steam & process up to 343°C (650°F).
Requires NACE MR0175 compliance and controlled hardness ≤22 HRC.
Limited to -45°C. For LNG (-162°C), use Austenitic Stainless Steel (304L/316L).
🔥 Welding & Heat Treatment
10°C min; 95°C for t > 19mm. Maintain interpass temp ≤ 230°C to preserve low-temperature notch toughness.
Required for nominal wall thickness t > 19mm (holding temp 590°C–630°C per ASME B31.3).
Mandatory Charpy V-notch impact testing at -45°C (-50°F) for base metal, HAZ, and weld deposit per ASTM A333.
Material property data provided is for preliminary engineering reference. Always verify properties against the latest ASME BPVC Section II, ASTM material specification, and Material Test Report (MTR/MTC).