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420  1.4021  1.4024  1.4028  Technical Data 420 is a martensitic stainless steel of the 13% chromium type. It is available with 3 variations in the carbon content As a 13% chromium stainless steel it will achieve a high hardness. It gives a good polish and is resistant to attack from corrosive plastics.   Typical Analysis  420S29           C. Mn. P. S. Si. Cr. Ni. Mo. 0.14- 1.00% 0.04% 0.03% 1.00% 11.50- 1.00% 0.30%   0.20% max. max. max.. max.   13.50% max max. Typical Analysis  420S37           C. Mn. P. S. Si. Cr. Ni. Mo. 0.20- 1.00% 0.04% 0.03% 1.00% 12.00- 1.00% 1.00%   0.28% max. max. max.. max.   14.00% max. max. Typical Analysis  420S45         C. Mn. P. S. Si. Cr. Ni. 0.28- 1.00% 0.04% 0.03% 1.00% 12.00- 1.00%   0.36% max. max. min. max.   14.00% max.   Physical Properties   Temperature       20ºC 100ºC 200ºC 400ºC Modulus of elasticity 22500 22000 21000 19500 kg/mm         Specific heat 0.11 0.12 0.13 0.14 kcal/ºC         Specific electrical resistance 0.6 0.7 0.8 0.9 (resistivity)