PRODUCTION OF STRUCTURAL MEMBER FROM STEEL HAVING BOTH OF HIGH STRENGTH AND HIGH TOUGHNESS

Title:

PRODUCTION OF STRUCTURAL MEMBER FROM STEEL HAVING BOTH OF HIGH STRENGTH AND HIGH TOUGHNESS

Document Type and Number:

Japanese Patent JPS62116719

Kind Code:

A

Abstract:

According to the invention, a bainite microstructure is obtained for steel-based components, which are subjected to hot deformation, by the addition of carbide-, nitride- and carbonitride-forming elements such as, for example, Nb to a steel having a carbon content of less than 0.3 per cent by weight; this microstructure is preserved even after hot deformation followed by controlled cooling. Alloy elements such as Mn, B and Mo assist the formation of bainite. A process of this type has the advantage that components such as, for example, lorry king pins, which are forged at temperatures of up to 1300 DEG C, no longer have to be re-hardened by a tempering stage after cooling, so that they still also have adequate toughness in addition to high strength.

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Inventors:

HANSU MIYURAA
MATSUKUSU ARUBERUTO

Application Number:

JP21827186A

Publication Date:

May 28, 1987

Filing Date:

September 18, 1986

Export Citation:

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Assignee:

MAN NUTZFAHRZEUGE GMBH

International Classes:

C21D8/00; B21J1/06; C21D1/20; C21D6/00; C21D9/00; C22C38/12; (IPC1-7): B21J1/06; C21D6/00; C21D8/00

Attorney, Agent or Firm:

Toshio Yano

Previous Patent: JPS62116718

Next Patent: MANUFACTURE OF RESISTANCE WELDED STEEL TUBE SUPERIOR IN HEAT RESISTANT CHARACTERISTIC