Title:
冷間塑性変形で鋼製品を製造するための鋼と、その製造方法
Document Type and Number:
Japanese Patent JP3988095
Kind Code:
B2
Abstract:
Steel contains by weight 0.03-0.16% carbon, 0.5-2% manganese, 0.05-0.5% silicon, 0-1.8% chromium, 0-0.25% molybdenum, 0.001-0.05% aluminium, 0.001-0.05% titanium, 0-0.15% vanadium, 0.0005-0.005% boron, 0.004-0.012% nitrogen and 0.001-0.09% sulphur, optionally also up to 0.005% calcium, 0.01% tellurium, 0.04% selenium and 0.3% lead and the rest iron and impurities. Proportions are governed by the following: Mn+0.9 Cr+1.3 Mo+1.6 V=at least 2.2%, and Al+Ti=at least 3.5 N. Also claimed are a hot-rolled semi-product of the steel with a bainitic structure and processes wherein pieces of the steel are hot-rolled, cut to size and then cold-formed, a bainitic structure being conferred by heating above 940 deg. C and quenching, either during and after hot-rolling or after cold-forming, also pieces of steel so formed.
Inventors:
Claude Picard
Application Number:
JP36835397A
Publication Date:
October 10, 2007
Filing Date:
December 26, 1997
Export Citation:
Assignee:
Asco Metal Society Anonymous
International Classes:
C21D7/02; C22C38/00; C21D8/00; C21D8/02; C22C38/14; C22C38/32; C22C38/38; C22C38/60; C21D8/06; C21C5/00
Domestic Patent References:
| JP61019761A | ||||
| JP64000222A | ||||
| JP2025516A | ||||
| JP6248341A | ||||
| JP5247590A |
Attorney, Agent or Firm:
Takashi Koshiba