ASTM A240 Grade 304LN Heat-Treated refers to a specific heat-treated variant of stainless steel grade 304LN as per the ASTM A240 standard.
Grade 304LN is an austenitic stainless steel with low carbon content, which offers excellent corrosion resistance and good mechanical properties. The "LN" in the grade designation stands for "low nitrogen," indicating reduced nitrogen content compared to standard grade 304.
The heat treatment process applied to ASTM A240 Grade 304LN involves subjecting the material to controlled heating and cooling conditions to modify its microstructure and enhance certain properties. Heat treatment can improve the material's strength, hardness, and other mechanical characteristics based on specific requirements.
| 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 |
310 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 |
0.03 %
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| Chromium |
18 - 20 %
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| Manganese |
2 %
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| Nickel |
8 - 12 %
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| Nitrogen |
0.1 - 0.16 %
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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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