ASTM A240 Grade 321 Heat-Treated is a specific variant of stainless steel grade 321 that has been subjected to heat treatment according to the ASTM A240 standard.
ASTM A240 Grade 321 is a stabilized austenitic stainless steel with titanium addition, which provides excellent resistance to intergranular corrosion and high-temperature oxidation. This grade offers good mechanical properties, high creep strength, and improved stress rupture resistance.
The heat treatment process applied to ASTM A240 Grade 321 involves controlled heating and cooling to modify the material's microstructure and enhance certain properties. Heat treatment can improve the steel's strength, hardness, and other mechanical characteristics based on specific requirements.
Heat-treated ASTM A240 Grade 321 stainless steel exhibits improved performance compared to the annealed condition. The heat treatment process may involve heating the material to a specific temperature range and holding it for a predetermined time, followed by controlled cooling. The exact parameters of the heat treatment process will depend on the desired properties and intended application.
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Density | 23.0 °C |
7.9 - 8.2 g/cm³
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Typical for Austenitic Stainless Steel |
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Elastic modulus | 23.0 °C |
195 GPa
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Typical for Austenitic Stainless Steel |
| Elongation A50 | 23.0 °C |
40 %
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| Hardness, Brinell | 23.0 °C |
217 [-]
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| Hardness, Rockwell B | 23.0 °C |
95 [-]
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| Poisson's ratio | 23.0 °C |
0.3 [-]
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Typical for Austenitic Stainless Steel |
| Shear modulus | 23.0 °C |
77 GPa
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Typical for Austenitic Stainless Steel |
| Tensile strength | 23.0 °C |
515 MPa
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| Yield strength Rp0.2 | 23.0 °C |
205 MPa
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| Yield strength Rp1.0 | 23.0 °C |
240 MPa
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| Property | Temperature | Value | Comment |
|---|---|---|---|
| Coefficient of thermal expansion | 23.0 °C |
1.7E-5 - 1.9E-5 1/K
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Typical for Austenitic Stainless Steel |
| Melting point |
1230 - 1480 °C
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Typical for Austenitic Stainless Steel | |
| Specific heat capacity | 23.0 °C |
440 J/(kg·K)
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Typical for Austenitic Stainless Steel |
| Thermal conductivity | 23.0 °C |
11 - 21 W/(m·K)
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Typical for Austenitic Stainless Steel |
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Electrical resistivity | 23.0 °C |
8.5E-7 Ω·m
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Typical for Austenitic Stainless Steel |
| Property | Value |
|---|---|
| Carbon |
0.08 %
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| Chromium |
17 - 19 %
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| Manganese |
2 %
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| Nickel |
9 - 12 %
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| Nitrogen |
0.1 %
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| Phosphorus |
0.05 %
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| Silicon |
0.75 %
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| Sulfur |
0.03 %
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