310S stainless steel is austenitic cr-ni stainless steel, with good oxidation resistance, corrosion resistance, high temperature resistance, because of a higher percentage of chromium and nickel, has much better creep strength, can continue to work at high temperature, with good high temperature resistance.
310S (UNS S31008) is the low carbon version of the alloy. It is utilized for ease of fabrication. 310H (UNS S31009) is a high carbon modification developed for enhanced creep resistance. In most instances the grain size and carbon content of the plate can meet both the 310S and 310H requirements.
Chemical Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
| Element | 310 | 310S | 310H |
Chromium | 24.0 min.-26.0 max. | 24.0 min.-26.0 max. | 24.0 min.-26.0 max. |
Nickel | 19.0 min.-22.0 max. | 19.0 min.-22.0 max. | 19.0 min.-22.0 max. |
Carbon | 0.25 | 0.08 | 0.40 min. - 0.10 max. |
Manganese | 2.00 | 2.00 | 2.00 |
Phosphorus | 0.045 | 0.045 | 0.045 |
Sulfer | 0.030 | 0.030 | 0.030 |
Silicon | 1.50 | 1.50 | 0.75 |
Iron | Balance | Balance | Balance |
Physical Properties
Density
0.285 lbs/in3
7.89 g/cm3
Specific Heat
0.12 BTU/lb-°F (32 – 212°F)
502 J/kg-°K (0 – 100°C)
Modulus of Elasticity
28.5 x 106 psi
196 GPa
Thermal Conductivity 212°F (100°C)
8.0 BTU/hr/ft2/ft/°F
10.8 W/m-°K
Melting Range
2470 – 2555°F
1354 – 1402°C
Electrical Resistivity
30.7 Microhm-in at 68°C
78.0 Microhm-cm at 20°C
Application
Stamping die, fixture, tool, gauge, cutting knife, auxiliary tools, etc
Improve the brittle property of carbon tool steel to extend the tool life. Vacuum degassed steel, stable quality. Good hardenability, oil quenching hard (quenching crack and deformation less) toughness and good wear resistance, durable tools.
Heat treatment
Tempering: 180 ~ 200
Annealing condition, ≤207HB, indentation diameter ≥4.20mm
Quenching, p 62 HRC