Back to results
US 7,459,034 B2Granted
Steel hoop made from a martensitic steel strip
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorKazuo Ishii
Life of this patent
Estimating the term…
Abstract
A steel strip made of martensitic steel contains C+N at not more than 0.12 wt %, Si at not more than 1 wt %, Mn at not more than 7 wt %, Ni at 2 to 24 wt %, Cr at 2 to 16 wt %, Mo at not more than 2.5 wt %, and Ni-Bal value and Ms value defined by the following equations shown by weight percentage of each composition are respectively Ni-Bal≧1.2, Ms≧−28. Ni-Bal=Ni+0.5Mn+30(C+N)−1.1(Cr+1.5Si)+8.2 Ms=502−810C 1230N−13Mn−30Ni−12Cr−54Cu−46Mo
Claims5
A steel hoop made from a martensitic steel strip having a composition comprising:
- not more than 0.12 wt % of C+N, not more than 1 wt % of Si, not more than 7 wt % of Mn, 2 to 24 wt % of Ni, 2 to 5.15 wt % of Cr, more than 1.0 wt % but not more than 2.5 wt % of Mo,
- wherein Ni-Bal value and Ms value defined by following equations shown by weight percentage of each composition are respectively Ni-Bal≧1.2, Ms≧−28, and
- wherein opposing ends of the steel strip are joined together to form a hoop before the steel strip is subjected to cold rolling of not less than 30%.
Dependencies are inferred from the claim text.