440C Stainless Steel Bar

440C stainless steel is a high carbon type of stainless, this is the alloy most often used for knife-making. Can be heat treated for high strength and hardness. 440C stainless steel has greater abrasion and wear resistance for use in bearing and bushing applications. Corrosion resistant only in the hardened condition.

Applications:

  • Ball bearings and races
  • Nozzles
  • Knives and measuring instruments
  • Surgical tools
  • Valves

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Alloy Grade
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Grade
Shape
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SKU Description DFARS Manufacture Method Diameter Shape Specification
Sku: 86871 Description: 440C Cond A QQ-S-763 .375" DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 0.3750 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630
Sku: 81728 Description: 440C COND A AMS 5630 .500" DIA DFARS: No Manufacture Method: NOT REQUIRED Diameter: 0.5000 Shape: STEEL ROD/BAR ROUND Specification: AMS5630 ASTM A276
Sku: 86872 Description: 440C Cond. A QQ-S-763 .500" DI DFARS: No Manufacture Method: HOT ROLLED Diameter: 0.5000 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630
Sku: A4357 Description: 440C Cond A AMS5630 .5625" DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 0.5625 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630 AMS-QQS-763
Sku: 86873 Description: 440C COND A QQ-S-763 .625"DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 0.6250 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630
Sku: A4358 Description: 440C Cond A AMS5630 .625" DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 0.6250 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630 AMS-QQS-763
Sku: 86874 Description: 440C COND A QQ-S-763 .875" DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 0.8750 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630
Sku: A4360 Description: 440C Cond A AMS5630 .875" DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 0.8750 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630 AMS-QQS-763
Sku: 89465 Description: 440C Cond A AMS5630 1.00" DIA DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 1.0000 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630 AMS-QQS-763
Sku: 86875 Description: 440C COND A QQ-S-763 1.125" DI DFARS: No Manufacture Method: HOT ROLLED ANNEALED & PICKLED Diameter: 1.1250 Shape: STEEL ROD/BAR ROUND Specification: AMS 5630

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Grade 440C ss is a high carbon martensitic stainless with moderate corrosion resistance good strength, and the ability to obtain and hold excellent hardness (Rc 60) and wear resistance. 440C stainless steel is considered to be slightly cold workable by common practices and does respond to heat treatment.

Chemistry
440C Stainless
Nickel (Ni) .75%
Molybdenum .75%
Copper (Cu) .5%
Manganese 1% max
Iron (Fe) Balance
Carbon (C) .95 – 1.2%
Chromium (Cr) 16 – 18%
Manganese (Mn) 1% max
Phosphorus (P) 0.04% max
Sulphur (S) 0.03% max
Silicon (Si) 1% max

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