SOFT HIGH CARBON STEEL STRIP SMALL IN HEAT TREATING STRAIN AND PRODUCING METHOD TEHREFOR

Title:

SOFT HIGH CARBON STEEL STRIP SMALL IN HEAT TREATING STRAIN AND PRODUCING METHOD TEHREFOR

Document Type and Number:

Japanese Patent JP3460659

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a high carbon steel strip excellent in cold workability before heat treatment such as quenching and tempering and capable of effectively suppressing heat treating strain and to provide an inexpensive and simple producing method therefor.
SOLUTION: The alloy composition has a steel composition composed of, by weight, 0.10 to 0.80% C, 0.005 to 0.30% Si and 0.20 to 1.60% Mn, in which 0.005 to 0.100% sol.Al, 0.0010 to 0.010% N and 0.001 to 0.050% Ti also satisfy the inequalities (1) and (2): X=0.15×sol.Al+N-0.29×Ti-0.0030≥0...(1), and Y=0.15×sol.Al+N-0.29×Ti-0.0135≤0...(2) with other inevitable impurities, and the average ferrite grain diameter (d) and shape (e) in the steel satisfy the conditions in the following inequalities (3) and (4) from the viewpoint of the metallic structure: 35<d (μm) <100...(3), and e=n1/n2>1.25...(4).

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Inventors:

Kiyoshi Fukui
Masaru Tsuji
Yoji Yanami

Application Number:

JP2000026618A

Publication Date:

October 27, 2003

Filing Date:

February 03, 2000

Export Citation:

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Assignee:

SUMITOMO METAL INDUSTRIES,LTD.

International Classes:

C21D8/02; C21D9/46; C22C38/00; C22C38/14; C22C38/38; (IPC1-7): C22C38/00; C21D8/02; C21D9/46; C22C38/14; C22C38/38

Attorney, Agent or Firm:

Shoichi Hirose

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