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Oil composition for heat treatment

A technology for heat treatment oil and composition, which is applied in the field of heat treatment oil composition for quenching metal materials, and can solve the problems of increased quenching deformation and the like

Inactive Publication Date: 2003-12-17
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in heat shrinkage or the temporary difference in transformation produced together with the temperature difference, thermal stress or transformation stress occurs, thereby increasing the quenching deformation

Method used

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  • Oil composition for heat treatment
  • Oil composition for heat treatment

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Experimental program
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Effect test

Embodiment 1-4 and comparative example 1-4

[0032] Carburizing for 2.5 hours at 930°C with a carbon potential of 1.1% on a test piece made of SCM420 with an outer diameter of 80 mm, a height of 44 mm, and a thickness of 5 mm. Thereafter, the test piece was subjected to a diffusion treatment for 1.0 hour at a carbon potential of 0.8%. Then the temperature of the test piece was lowered to 850° C., and after 20 minutes of ignition, the test piece was quenched using the heat treatment oil composition (100° C.) of the mixed composition shown in Table 1. The results are shown in Table 1. In Table 1, data in parentheses represent kinematic viscosities at 40°C.

[0033] (annotation)

[0034] Low viscosity base oil A-1: ​​13.5mm 2 / s(40℃) paraffin series mineral oil

[0035] Low viscosity base oil A-2: 90.5mm 2 / s(40℃) paraffin series mineral oil

[0036] High viscosity base oil B-1: 435mm 2 / s(40℃) paraffin series mineral oil

[0037] High viscosity base oil B-2: 781mm2 / s(40℃) paraffin series mineral oil

[0038] Stea...

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Abstract

A heat treatment oil composition comprising a mixed base oil containing 50-95 weight % of (A) a low viscosity base oil with kinematic viscosity of 5-60 mm2 / s at 40° C., and 50-5 weight % of (B) a high viscosity base oil with kinematic viscosity of more than 300 mm2 / s at 40° C. is proposed. By the use of this heat treatment oil composition for hardening of metallic material, it enables to generate little cooling unevenness, to assure the hardness of hardening processed product, and to reduce quenching distortion.

Description

field of invention [0001] The present invention relates to a heat treatment oil composition. More specifically, the present invention relates to a heat treatment oil composition for quenching of metallic materials to prevent uneven cooling, ensure product hardness after quenching, and reduce quenching deformation. Background of the invention [0002] For metal materials such as steel products, heat treatments such as quenching, tempering, annealing and normalizing are performed to improve material properties. Among these heat treatments, quenching is the treatment of a heated steel product under austenitic conditions, such as cooling with an upper critical cooling rate or higher, and transformation into a quenched structure such as martensite. By quenching, the processed product becomes very hard. In this case, as a coolant, an oil-based, water-based (aqueous solution-based) or emulsion-based heat treatment liquid is generally used. [0003] For quen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M143/00C10M145/14C10M171/02C10N20/02C10N30/00C10N40/20C21D1/58
CPCC21D1/58C10M171/02
Inventor 市谷克实武石诚
Owner IDEMITSU KOSAN CO LTD
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