MANUFACTURE OF SI-CR SYSTEM HOT ROLLED HIGH TENSILE STEEL SHEET HAVING HIGH DUCTILITY AND LOW YIELD RATIO

Title:

MANUFACTURE OF SI-CR SYSTEM HOT ROLLED HIGH TENSILE STEEL SHEET HAVING HIGH DUCTILITY AND LOW YIELD RATIO

Document Type and Number:

Japanese Patent JPS5616624

Kind Code:

A

Abstract:

PURPOSE: To manufacture steel sheet having low yield ratio, high strength, excellent ductility, by rolling steel having a specific composition contg. C, Si, Mn, Cr so that rolling may be completed in a specific temp. range.

CONSTITUTION: Steel consisting by weight. of, 0.05W0.15% C, 1.01W2% Si, 0.5W 1.5% Mn, 0.05W0.8% Cr, the balance being Fe and inevitable impurities, and contg. at need ≤0.015% S, in addition, Zr in the ratio 2≤Zr/S≤10 or rare earth elements (REM) in the ratio 1.3≤REM/S≤5 or Ca in the ratio 0.5≤Ca/S≤1.5 is rolled. The rolling is completed at a temp. ≥Ar3-30°C and ≤Ar3+60°C. The steel may be rolled after heated in a heating furnace of slab, then it is wound at 250W480°C temp. thereby manufacturing steel sheet having ≤60% yield ratio.

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Inventors:

WATANABE KUNIO
HASHIMOTO YOSHIO
SATOU TOYOHIKO

Application Number:

JP9161879A

Publication Date:

February 17, 1981

Filing Date:

July 20, 1979

Export Citation:

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Assignee:

NIPPON STEEL CORP

International Classes:

C22C38/00; C21D8/02; C21D9/46; (IPC1-7): C22C38/18; C22C38/28

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