Surface quenching method of hot straightening roll

Abstract

The invention discloses a surface quenching method of a hot straightening roll. The method adopts a medium-frequency quenching mode in a double-frequency quenching inductor; the medium frequency is 200Hz to 250Hz; the height of an inductor coil is 70mm to 120mm; the quenching temperature is 1070 to 1125 DEG C. Spray cooling is firstly performed on the hot straightening roll after quenching, and then immersion cooling is performed on the hot straightening roll. The method can be used for producing the hot straightening roll with the effective hardening layer of 12mm to 18 mm and the structure grain size of 9.5 to 10 level, and the energy consumption is low.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a surface quenching method of a hot straightening roller. Background technique [0002] At present, the production lines of wide and thick steel plates at home and abroad are developing rapidly. After the wide and thick steel plates are rolled, hot leveling rolls are required for thermal leveling. Therefore, the surface hardness, hardness uniformity, effective hardened layer and grain size of the hot straightening roller are very high. [0003] At present, in the manufacturing process of hot straightening rollers, there are mainly two ways to quench the surface of hot straightening rollers: high-frequency continuous quenching and argon-protected arc combustion quenching. The disadvantages of high-frequency continuous quenching are: high frequency (above 5000Hz) high energy consumption, shallow effective hardened layer (below 5mm), and thick structure; the disadvantages of argon protect...

AI Technical Summary

Problems solved by technology

The disadvantages of high-frequency continuous quenching are: high frequency (above 5000Hz) high energy consumption, shallow effective hardened layer (below 5mm), and thick structure; the disadvantages of argon protection arc combustion quenching are: shallow effective hardened layer (below 5mm ), hardness uniformity is not good (≥4HSD)

The shortcomings of this document are: (1) Quenching is carried out at an intermediate frequency of 2500-3000 Hz, and the energy consumption is still high

(3) Although the final effective hardened layer in this document can reach 10mm to 15mm, this has a lot to do with the use of modified H13 hot work die steel as the material, and this modified material has not been industrialized on the one hand The finished product, which greatly limits its use, on the other hand, this material increases the content of some metal elements, especially the content of Ni, so the cost of the material is also high

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