ASTM A358 TP304L
UNS S30403ASTM A358 TP304L material
Key Engineering Metrics
Instant specifications summary for ASTM A358 TP304L
General Specifications & Standard Data
ASTM A358Minimum 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
Retains high impact toughness down to -196°C (-320°F). Standard for LNG & liquid nitrogen.
Superior resistance to nitric acid, organic acids, and pharmaceutical process streams.
Zero rust/iron contamination for DI water, pure steam, and food/beverage lines.
NACE MR0175 compliant for low-severity sour service without PWHT.
High susceptibility to pitting and Chloride Stress Corrosion Cracking (CSCC) >60°C.
🔥 Welding & Heat Treatment
None required (ambient ≥ 10°C). Interpass temperature must be strictly controlled < 150°C (300°F) to prevent heat tint & carbide precipitation.
PWHT is not recommended or required; causes chromium carbide sensitization. Full solution annealing at 1040°C + rapid quench if required.
Exempt down to -196°C (-320°F) per ASME B31.3 Table 323.2.2 for base metal & filler metal.
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).