C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/10
C21D 8/02 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01)
Patent
CA 1274155
HARD STEEL SHEET MANUFACTURED FROM AL-KILLED CONTINUOUS-CAST CARBON-MANGANESE STEEL, AND A METHOD FOR THE MANUFACTURE OF SUCH SHEET ABSTRACT OF THE DISCLOSURE Steel sheet manufactured from Al-killed continuous cast carbon-manganese steel and having a hardness in the range 57 to 73 HR30T is characterized by a content of 0.03 to 0.10% by weight C and 0.15 to 0.50% by weight Mn, and an amount Z in ppm of dissolved uncombined nitrogen given by Z ? 2.5 x (H-55) where H is the hardness (HR30T). In this way, hard sheet is obtained at low Mn and C contents. In manufacture of the sheet, the thickness reduction in skin-passing is dependent on the uncombined nitrogen content and an aging by heat treatment is performed after skin-passing.
514775
de Haas Maarten A.
Edelman Arie B. C.
Hoogendoorn Thomas M.
Kleijn Jan B.
Hoogovens Groep B.v.
Ridout & Maybee Llp
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