ASTM A420 WPL6
UNS K03006ASTM A420 WPL6 material
Key Engineering Metrics
Instant specifications summary for ASTM A420 WPL6
General Specifications & Standard Data
ASTM A420Minimum 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-bpvcAllowable Stress vs Temperature
ASME B31.3 / BPVC Section II Part D Reference Curve
| Temperature (°C) | Allowable Stress (MPa) | % of Room Temp Rating |
|---|---|---|
| 38 | 117.9 | 100% |
| 100 | 117.9 | 100% |
| 150 | 117.9 | 100% |
| 200 | 117.9 | 100% |
| 250 | 117.9 | 100% |
| 300 | 117.9 | 100% |
| 350 | 115.1 | 98% |
| 400 | 88.9 | 75% |
| 450 | 62.1 | 53% |
| 500 | – | – |
| 550 | – | – |
| 600 | – | – |
| 650 | – | – |
🛡️ ASME B16.5 Flange P-T Ratings & Calculator
Material Group 1.1 (Carbon and low-alloy steel materials)
| Temp (°C) | Class 150 | Class 300 | Class 400 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|---|
| -29 to 38 | 19.6 | 51.1 | 68.1 | 102.1 | 153.2 | 255.3 | 425.5 |
| 50 | 19.2 | 50.1 | 66.8 | 100.2 | 150.4 | 250.6 | 417.7 |
| 100 | 17.7 | 46.6 | 62.1 | 93.2 | 139.8 | 233 | 388.3 |
| 150 | 15.8 | 45.1 | 60.1 | 90.2 | 135.2 | 225.4 | 375.6 |
| 200 | 13.8 | 43.8 | 58.4 | 87.6 | 131.4 | 219 | 365 |
| 250 | 12.1 | 41.9 | 55.9 | 83.9 | 125.8 | 209.7 | 349.5 |
| 300 | 10.2 | 39.8 | 53.1 | 79.6 | 119.5 | 199.1 | 331.8 |
| 325 | 9.3 | 38.7 | 51.6 | 77.4 | 116.1 | 193.6 | 322.6 |
| 350 | 8.4 | 37.6 | 50.1 | 75.1 | 112.7 | 187.8 | 313 |
| 375 | 7.4 | 36.4 | 48.5 | 72.7 | 109.1 | 181.8 | 303.1 |
| 400 | 6.5 | 34.7 | 46.3 | 69.4 | 104.2 | 173.6 | 289.3 |
| 425 | 5.5 | 28.8 | 38.4 | 57.5 | 86.3 | 143.8 | 239.7 |
| 450 | 4.6 | 23 | 30.7 | 46 | 69 | 115 | 191.7 |
| 475 | 3.7 | 17.4 | 23.2 | 34.9 | 52.3 | 87.2 | 145.3 |
| 500 | 2.8 | 11.8 | 15.7 | 23.5 | 35.3 | 58.8 | 97.9 |
| 538 | 1.4 | 5.9 | 7.9 | 11.8 | 17.7 | 29.5 | 49.2 |
Working pressures are in gauge (bar). Values interpolated linearly for intermediate temperatures per ASME B16.5 para. 2.3.
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 Equivalents
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).