Title:
METHOD FOR DERIVING COOLING TIME WHEN QUENCHING STEEL MATERIAL, METHOD FOR QUENCHING STEEL MATERIAL, AND METHOD FOR QUENCHING AND TEMPERING STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2017/056582
Kind Code:
A1
Abstract:
Provided are a method for deriving a cooling time when quenching a steel material, a method for quenching a steel material and a method for quenching and tempering a steel material. The method for deriving a cooling time comprises: step A of cooling a test specimen heated to a cooling initiation temperature Ts under a cooling condition C and measuring the cooling time t until the temperature of a center portion of the test specimen reaches a cooling termination temperature Te; step B of determining a function f which is defined by t = f(V/S) and which is satisfied by data including the volume V, the surface area S and the cooling time t of the test specimen obtained in step A; and step C of substituting the volume V1 and the surface area S1 of the shape F1 of a steel material to be actually quenched in the relational expression t = f(V/S), and calculating a cooling time t1. The method for quenching a steel material comprises: actually heating the steel material to be quenched to the cooling initiation temperature Ts; cooling only for the cooling time t1 under the cooling condition C; and then stopping cooling under the cooling condition C. The method for quenching and tempering a steel material comprises tempering the steel material quenched by this method.
Inventors:
HIRAMOTO ATSUHIRO (JP)
YASUI ATSUSHI (JP)
YASUI ATSUSHI (JP)
Application Number:
PCT/JP2016/068223
Publication Date:
April 06, 2017
Filing Date:
June 20, 2016
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C21D11/00; C21D1/18; C22C38/00; C22C38/06
Foreign References:
| JPH07188734A | 1995-07-25 |
Other References:
See also references of EP 3358023A4
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