TSING SHAN STEEL INDUSTRIAL LIMITED
TSING SHAN STEEL INDUSTRIAL LIMITED
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AISI 420 stainless steel (SS420) is a straight chromium martensitic stainless steel grade with certain wear resistance, corrosion resistance and high hardness.
The tables below give 420 stainless steel (SS420) datasheet and specification including chemical composition, properties, heat treatment, etc.
Datasheet 1, The table below shows ASTM AISI 420 stainless steel composition.
| Chemical Composition, % | ||||||||||
| ASTM | AISI (UNS) | C, ≥ | Si, ≤ | Mn, ≤ | P, ≤ | S, ≤ | Cr | Ni, ≤ | Mo, ≤ | Product form |
| ASTM A240/A240M | SS 420 (UNS S42000) | 0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 12.0-14.0 | 0.75 | 0.50 | Plate, Sheet, and Strip |
| ASTM A276A/A276M | 0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 12.0-14.0 | – | – | Bars and Shapes | |
The datasheets below list type 420 stainless steel (SS420) properties including physical properties and mechanical properties.
SS 420 stainless steel physical properties are listed in the table below such as density, melting point, specific heat, electrical resistivity, elastic modulus, thermal conductivity, and coefficient of thermal expansion (CTE).
Datasheet 2, 420 stainless steel properties – 1.
| SS 420 Physical Properties | |
| Density, g/cm3 (lb/in.3) | 7.8 (0.28) |
| Melting point, °C (°F) | 1450-1510 (2650-2750) |
| Specific heat capacity, J/kg·K (Btu/lb·°F) | 460 (0.11) at 0-100 °C (32 to 212 °F) |
| Electrical resistivity, μΩ·m | 0.55 at 20 °C |
| Elastic modulus (Modulus of elasticity), GPa (106 psi) | 200 (29) |
| Thermal conductivity, W/m·K (Btu/ft·h·°F) | 24.9 (14.4), at 100 °C (212 °F) |
| Coefficient of thermal expansion, μm/m·°C (μin./in. ·°F) | 10.3 (5.7), at 0-100 °C (32-212 °F) |
| 10.8 (6.0), at 0-315 °C (32-600 °F) | |
| 11.7 (6.5), at 0-538 °C (32-1000 °F) | |
AISI 420 stainless steel mechanical properties are given in the datasheet below including tensile strength, yield strength, elongation, reduction in area, Brinell and Rockwell hardness, Charpy impact test, etc.
Datasheet 3, Type 420 stainless steel properties – 2.
| SS420 mechanical properties in various heat-treated or cold-worked conditions. | |||||||
| Type (UNS) | Condition | Tensile strength, MPa (ksi), ≤ | Yield strength, MPa (ksi), ≤ | Elongation in 50.8 mm (2 in.), %, ≥ | Reduction in area, %, ≥ | Hardness | Charpy V-notch impact strength, J (ft·lbf) |
| AISI 420 (UNS S42000) | Oil quenched from 1038 °C (1900 °F) and tempered at 316 °C (600 °F) | 1724 (250) | 1482 (215) | 8 | 25 | 52 HRC, Rockwell, ≥ | 20 (15), ≥ |
| Annealed bar | 655 (95) | 345 (50) | 25 | 55 | 195 HBW, Brinell, ≤ | – | |
| Annealed and cold drawn | 760 (110) | 690 (100) | 14 | 40 | 228 HBW, Brinell, ≤ | – | |
Type 420 stainless steel heat treatment includes annealing, hardening, tempering and stress relief. Preparation for heat treatment includes precleaning, preheating, atmosphere protection, salt bath, and hydrogen embrittlement.
Annealing for ASTM AISI 420 wrought stainless steel.
Hardening for 420 grade stainless steel: Heating to austenitizing temperature 980-1065 °C (1800-1950 °F), quenching medium is air or oil, if the part thickness is > 0.25 in. (6.4 mm), oil quenching should be used. After quenching to room temperature, immediate cold treatment is recommended and the recommended cold treatment temperature is -75±10 °C (-100±20 °F), which can reduce austenite and keep maximum dimensional stability.
