Available Shapes
440B Stainless Steel
SS440B / UNS S44003 This high-carbon chromium steel is designed to provide stainless properties with excellent hardness. In some respects, it behaves similarly to tool steels. Carpenter Stainless Type 440B attains a hardness of Rockwell C 58 when heat treated and has been used for cutlery, hardened balls, and similar parts. This steel makes fair permanent magnets. 440B is very similar to the 440C grade, Its corrosion resistance properties are similar to 410 stainless steel.
Related Specifications
1.4112 X90CrMoV18 ASTM A276 UNS S44003 AISI 440
Applications
Analysis
Annealing
Hardening
Tempering
Hardening
Typical Mechanical Properties*
Applications
Grade 440B stainless steel is used in measuring instruments, gage blocks, cutlery, knives, dies, molds, ball bearings and valve components.
Analysis
| Carbon | 0.75-0.95% | Chromium | 16.00-18.00% |
| Manganese | 1.00% max | Sulphur | 0.030% max |
| Silicon | 1.00% max | Phosphorous | 0.040% max |
| Molybdenum | 0.75% max |
Annealing
Grade 440B stainless steel is annealed at 843-871°C (1550-1600°F) and then cooled very slowly in a furnace.
Hardening
Grade 440B stainless steel is heated at 760°C (1400°F), soaked at 1010°C (1850°F) and finally cooled in oil or air.
Tempering
When tempering 440B a Rockwell hardness of 58 HRc can be obtained. Temper for at least one hour. Tempering above 400°C is not recommended as this can cause a reduction in corrosion resistance and impact properties.
| Temperature [°C] | 150 | 200 | 250 | 300 | 350 |
| Hardness [HRc] | 58 | 56 | 54 | 53 | 54 |
Hardening
Soft annealing: 750-800ºC Slow furnace cooling (2-4 hours) Hardening: 1000-1080ºC Max obtainable hardness 57-59 HRC
Typical Mechanical Properties*
Soft annealing: 750-800ºC Slow furnace cooling (2-4 hours) Hardening: 1000-1080ºC Max obtainable hardness 57-59 HRC
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