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ASTM A540 B23/B24
ASTM A540 B23/B24 material
boltingbolting
⚡
Key Engineering Metrics
Instant specifications summary for ASTM A540 B23/B24
Yield Strength💪
550.0MPa
Min specified
Tensile Strength🏋️
750.0MPa
Ultimate min
Carbon Eq. (CE)🧪
N/A
IIW Formula
P-No. / Group⚙️
-
ASME Sec. IX
Flange Group🛡️
N/A
ASME B16.5
MDMT Curve❄️
Refer to
ASME B31.3
General Specifications & Standard Data
ASTM A540Standard Specification
ASTM A540
Grade / Designation
B23/B24
UNS Designation
N/A
ASME P-No. / Group No.
Unassigned
ASME B31.3 MDMT Curve
Refer to ASME B31.3 Fig 323.2.2A
Minimum Design Metal Temperature rules for impact testing exemption under ASME B31.3 paragraph 323.2.2.
Mechanical Properties
Room Temp (20°C / 68°F)Yield-to-Tensile Ratio73%
Yield Strength (550.0 MPa)Tensile Strength (750.0 MPa)
Density
7850kg/m³
Min Yield
550.0MPa
Min Tensile
750.0MPa
Elastic Modulus
200GPa
Elongation (min)
25%
Thermal Expansion
12µm/m·K
Thermal Cond.
45W/m·K
Poisson’s Ratio
0.3
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
Max: 137.9 MPaRange: 38° - 500°
| 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 AnalysisC
≤ 0.35%
Mn
≤ 1.2%
Si
≤ 0.35%
P
≤ 0.04%
S
≤ 0.04%
🛡️ Service Compatibility
High Temp Pressure Flangesexcellent
High tensile strength for ASME B16.5 flanges up to 450°C.
Corrosive Atmospheresgood
Provides excellent atmospheric & chemical corrosion resistance.
🔩 Compatible Nuts
Recommended bolt/nut pairings
⚠️ Engineering Verification Notice
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).