Title:
劣化度判定方法
Document Type and Number:
Japanese Patent JP6741634
Kind Code:
B2
Abstract:
To provide a deterioration degree determination method capable of easily and accurately determining whether or not a polymer aqueous solution for quenching of steel materials can be used continuously.SOLUTION: A deterioration degree determination method includes: a step of acquiring the relationship between an average heat transfer coefficient and a maximum stress based on a steel material and a polymer aqueous solution, and a threshold value of a hardening crack stress; a step of performing a quenching test by using the polymer aqueous solution and the small test piece of the same type as the steel material to be determined in the operation process, and measuring the temperature change of each portion of the small test piece and the polymer aqueous solution with time; a step of calculating an average heat transfer coefficient Kin a predetermined temperature range including the transformation point of the steel material from the measurement results; a step of deriving the maximum stress σderived from the relationship between the average heat transfer coefficient and the maximum stress obtained in the acquisition step, on the basis of the average heat transfer coefficient K; and a step of determining whether the continuous use of the polymer aqueous solution is possible by the threshold value of the hardening crack stress and the maximum stress σobtained in the acquisition step.SELECTED DRAWING: Figure 1
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Inventors:
Masayoshi Tojima
Toro Matsumiya
Arikawa Takeshi
Ryosuke Imamura
Toro Matsumiya
Arikawa Takeshi
Ryosuke Imamura
Application Number:
JP2017175225A
Publication Date:
August 19, 2020
Filing Date:
September 12, 2017
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
G01N25/18; C21D1/55; G01N17/00
Domestic Patent References:
| JP2017037019A | ||||
| JP2010285690A | ||||
| JP2001234233A | ||||
| JP2014167487A | ||||
| JP7146264A |
Other References:
有川 剛史,大型鍛鋼品ポリマー焼入れにおける段付き丸棒のフランジ厚みが焼割れ発生に及ぼす影響 ‐大型鍛鋼品のポリマー焼入れに関する研究‐,塑性と加工,2016年 7月,Vol.57 No.666 ,Page.648-654
Attorney, Agent or Firm:
Hajime Amano
Fujimoto Katsune
Yoshinori Ikeda
Hiroshi Ogawa
Koji Ishida
Kenichi Fujinaka
Fujimoto Katsune
Yoshinori Ikeda
Hiroshi Ogawa
Koji Ishida
Kenichi Fujinaka