C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/10 (2006.01) B21B 37/32 (2006.01) B21B 37/74 (2006.01) C21D 9/08 (2006.01) C22C 38/06 (2006.01)
Patent
CA 2281314
A steel pipe containing fine ferrite crystal grains, which has excellent toughness and ductility and good ductility-strength balance as well as superior collision impact resistance, and a method for producing the same are provided. A steel pipe containing super-fine crystal grains can be produced by heating a base steel pipe having ferrite grains with an average crystal diameter of di (µm) , in which C, Si, Mn and Al are limited within proper ranges, and if necessary, Cu, Ni, Cr and Mo, or Nb, Ti, V, B, etc. are further added, at not higher than the Ac3 transformation point, and applying reducing at an average rolling temperature of .theta.m (°C) and a total reduction ration Tred (%) within s temperature range of from 400 to Ac3 transformation point, with di, .theta.m and Tred being in a relation satisfying a prescribed equation.
Hashimoto Yuji
Itadani Motoaki
Kanayama Taro
Matsuoka Saiji
Morita Masahiko
Jfe Steel Corporation
Kawasaki Steel Corporation
Robic
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