Repair weld composite leveller roll and its production process

Abstract

It relates to a pile-up welding composite straightener roll and the preparation technique, belonging to the art of mechanical device, and it especially relates to a straighter roll for a plate hot straightening machine. The straightener roll uses alloy constructional steel 42CrMo wrought-steel as the base metal to prepare mandrel of roll body, and is built-up an operational layer of 5-15mm by thicken on the surface of the roll body, the chemical composition of the deposited material of the operational layer being: C:0.36-0.45%, Cr: 12.00-14.00%, Ni:2.00-2.50%, Mo: 2.00- 3.00%, W: 2.00- 3.00%, Ti: 0.85-1.25%, Si: <=1.50%, Mn: <= 2.00%, P<= 0.035%, and S: <=0.03%. In the technique it uses 1250 type automatic buried arc building-up device, applies bobbing building-up to build up the operation layer of roll body, and uses the 260 weld flux as the welding material. The straightener roll has a long work life and a high strength of roll body, and it can be repaired and reproduced a plural of times.

Description

technical field [0001] The invention belongs to the field of mechanical equipment, and in particular relates to a straightening roller for a medium-thick plate thermal straightening machine. Background technique [0002] The straightening roll body of the medium and thick plate thermal leveling machine should have the ability to resist torsion, bending, and fatigue impact. The roll surface should have high hardness, high wear resistance and corrosion resistance, so as to ensure the quality of the straightened steel plate. The straightening rolls of traditional medium and heavy plate hot leveling machines in my country are often made of 60CrMnMo, 60CrMoV and other roll steels. After being forged as a whole, they are heat treated to meet the performance requirements. The disadvantage of this kind of straightening roll is that it is integrally forged from one material, and the manufacturing cost is high. Different from the performance requirements of the roll body, during use,...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low high temperature oxidation resistance and corrosion resistance, fast wear, low wear resistance, and easy occurrence of cracks, drop blocks, and slightly raised hard spots on the quenched layer of the roll surface for the production of straightening rolls by integral forging of materials. , bonded iron oxide scale and other issues