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Title:
METHOD FOR PRODUCING HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT SURFACE PROPERTY
Document Type and Number:
Japanese Patent JP2002194442
Kind Code:
A
Abstract:

To provide a method for producing a high strength hot rolled steel sheet which has excellent removability of Si scale, and has excellent surface properties.

A slab having a steel composition containing, by mass, 0.03 to 0.25% C, 0.1 to 2.5% Si and 0.05 to 2.0% Mn, or further containing one or more kinds selected from 0.05 to 2.0% Cr, 0.30 to 1.5% Cu, 0.30 to 1.5% Ni, 0.02 to 0.30% Nb and 0.02 to 0. 30% Ti, and the balance Fe with inevitable impurities is heated and held at a surface temperature in the range of 1,200 to 1,280°C for ≥75 min. The slab surface temperature before final descaling directly before finish rolling is controlled to ≤1,180°C, and the slab is subjected to final descaling, is finish-rolled, and is thereafter coiled.


Inventors:
MUKAI YOICHI
TOYODA TETSUO
Application Number:
JP2000388049A
Publication Date:
July 10, 2002
Filing Date:
December 21, 2000
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
B21B45/00; B21B45/06; C21D9/46; C22C38/00; C22C38/04; C22C38/58; (IPC1-7): C21D9/46; B21B45/00; B21B45/06
Attorney, Agent or Firm:
Honda Ryu Male