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440C  1.4125  Technical Data 440C is a high carbon chromium stainless steel providing stainless steel properties with optimum hardness after heat treatment. 440C can achieve a hardness of up to 60 Rockwell HRc.  440C stainless resists corrosion in normal domestic environments and very mild industrial enviroments, with optimum cossision resistance of 440C achieved with a temper below about 400°C. For 440C to achieve best cossosion resistance, surfaces must be free of scale, lubricants, foreign particles, and coatings applied for drawing and heading.  With its high carbon content 440C annealed stainless machines similar to a high speed steel annealed grade   Typical Analysis           C. Mn. P. S. Si. Cr. Mo. 0.95- 1.00% 0.04% 0.03% 1.00% 16.00- 0.75% 1.20% max. max. min. max. 18.00% max. Annealing To achieve full anealing of 440B heat uniformly to 840 to 875°C. Soak and cool very slowly in the furnace. Hardening To heat treat 440B heat to 1010 to 1070°C, fully soak and quench in warm oil or cool in air. Be carefull not to overheat 440C or full hardness will not be obtained. Tempering When tempering 440C a Rockwell hardness of 60HRc can be obtained. Temper for at least one hour. Tempering °C 300 400 500 600 700 HRc 60 59 57 56 56   Mechanical Properties at Room Temperature (440C hardened at 1040°C, oil quenched and tempered at 300°C)  Tensile (UTS) 1965 N/mm²  0.2% Yield Strength   1896 N/mm²  Elongation (50.8mm)   2% min  Hardness   59HRc  Reduction of Area   10      Cr Alloy Martensitic Stainless Steel Specifications 440C UNS S44004 AISI 440C  ASTM A276 1.4125