ASTM A815 S31803
UNS S31803ASTM A815 S31803 material
Key Engineering Metrics
Instant specifications summary for ASTM A815 S31803
General Specifications & Standard Data
ASTM A815Minimum 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 | 177.2 | 100% |
| 100 | 176.5 | 100% |
| 150 | 171.0 | 96% |
| 200 | 165.5 | 93% |
| 250 | 161.3 | 91% |
| 300 | 160.0 | 90% |
| 350 | – | – |
| 400 | – | – |
| 450 | – | – |
| 500 | – | – |
| 550 | – | – |
| 600 | – | – |
| 650 | – | – |
🛡️ ASME B16.5 Flange P-T Ratings & Calculator
Material Group 2.8 (Stainless steel materials)
| Temp (°C) | Class 150 | Class 300 | Class 400 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|---|
| -29 to 38 | 20 | 51.7 | 68.9 | 103.4 | 155.1 | 258.6 | 430.9 |
| 50 | 19.5 | 51.7 | 68.9 | 103.4 | 155.1 | 258.6 | 430.9 |
| 100 | 17.7 | 50.7 | 67.5 | 101.3 | 152 | 253.3 | 422.2 |
| 150 | 15.8 | 45.9 | 61.2 | 91.9 | 137.8 | 229.6 | 382.7 |
| 200 | 13.8 | 42.7 | 56.9 | 85.3 | 128 | 213.3 | 355.4 |
| 250 | 12.1 | 40.5 | 53.9 | 80.9 | 121.4 | 202.3 | 337.2 |
| 300 | 10.2 | 38.9 | 51.8 | 77.7 | 116.6 | 194.3 | 323.8 |
| 325 | 9.3 | 38.2 | 50.9 | 76.3 | 114.5 | 190.8 | 318 |
| 350 | 8.4 | 37.6 | 50.2 | 75.3 | 112.9 | 188.2 | 313.7 |
| 375 | 7.4 | 37.4 | 49.8 | 74.7 | 112.1 | 186.8 | 311.3 |
| 400 | 6.5 | 36.5 | 48.9 | 73.3 | 109.8 | 183.1 | 304.9 |
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
High PREN (≥34 for 2205, ≥42 for 2507); immune to marine pitting & velocity erosion.
High yield strength & superior resistance to sulfide stress cracking (NACE MR0175).
Outstanding resistance to Chloride Stress Corrosion Cracking (CSCC) up to 150°C.
Risk of 475°C embrittlement and sigma phase precipitation above 280°C.
Ferritic phase undergoes ductile-brittle transition below -50°C.
🔥 Welding & Heat Treatment
No preheat required (keep < 100°C). Control heat input (0.5–2.5 kJ/mm) and interpass temp < 150°C to maintain 50:50 ferrite-austenite phase balance.
PWHT not performed in field. Full solution annealing (1040°C–1120°C + water quench) required if welded without filler or if phase balance is disrupted.
Charpy V-notch impact test required at -40°C or -50°C for weld procedure qualification per ASTM A790 / A815.
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).