High-hardness martensitic stainless steel excellent in corrosion resistance
AssigneeDaido Tokushuko Kabushiki Kaisha
InventorsTakeshi Koga, Tetsuya Shimizu, Toshiharu Noda
Life of this patent
Estimating the term…
Abstract
A high-hardness martensitic stainless steel excellent in corrosion resistance, comprising less than 0.15% by weight of C, from 0.10 to 1.0% by weight of Si, from 0.10 to 2.0% by weight of Mn, 0.010% or less of S, from 12.0 to 18.5% by weight of Cr, from 0.40 to 0.80% by weight of N, less than 0.030% by weight of Al, less than 0.020% by weight of O, and substantially the balance of Fe. The martensitic stainless steel of the present invention has cold-workability and hardness after tempering higher than that of SUS420J2 and corrosion resistance equivalent to or higher than that of an austenitic stainless steel SUS316.
Claims7
A high-hardness martensitic stainless steel excellent in corrosion resistance, comprising less than 0.15% by weight of C, from 0.10 to 1.0% by weight of Si, from 0.10 to 2.0% by weight of Mn, from 12.0 to 18.5% by weight of Cr, from 0.40 to 0.80% by weight of N, less than 0.030% by weight of Al, less than 0.020% by weight of O, and substantially the balance of Fe.
A high-hardness martensitic stainless steel excellent in corrosion resistance, comprising less than 0.15% by weight of C, from 0.10 to 1.0% by weight of Si, from 0.10 to 2.0% by weight of Mn, from 12.0 to 18.5% by weight of Cr, from 0.40 to 0.80% by weight of N, less than 0.030% by weight of Al, less than 0.020% by weight of O, one or more of from 0.20 to 3.0% by weight of Ni, from 0.20 to 3.0% by weight of Cu, from 0.20 to 4.0% by weight of Mo and from 0.50 to 4.0% by weight of Co, and substantially the balance of Fe.
A high-hardness martensitic stainless steel excellent in corrosion resistance comprising less than 0.15% by weight of C, from 0.10 to 1.0% by weight of Si, from 0.10 to 2.0% by weight of Mn, from 12.0 to 18.5% by weight of Cr, from 0.40 to 0.80% by weight of N, less than 0.030% by weight of Al, less than 0.020% by weight of O, one or more of Nb, V, W, Ti, Ta and Zr in a respective amount of from 0.020 to 0.20% by weight, and substantially the balance of Fe.
A high-hardness martensitic stainless steel excellent in corrosion resistance, comprising less than 0.15% by weight of C, from 0.10 to 1.0% by weight of Si, from 0.10 to 2.0% by weight of Mn, from 12.0 to 18.5% by weight of Cr, from 0.40 to 0.80% by weight of N, less than 0.030% by weight of Al, less than 0.020% by weight of O, one or more of from 0.20 to 3.0% by weight of Ni, from 0.20 to 3.0% by weight of Cu, from 0.20 to 4.0% by weight of Mo and from 0.50 to 4.0% by weight of Co, one or more of Nb, V, W, Ti, Ta and Zr in a respective amount of from 0.020 to 0.20% by weight and substantially the balance of Fe.
Dependencies are inferred from the claim text.