Surface overlaying welding material for fixed-width side press module and overlaying welding process

Abstract

The invention relates to a surface overlaying welding material for a fixed-width side press module and an overlaying welding process thereof. The overlaying welding material comprises the following components in percentage by weight: less than or equal to 0.08 percent of C, less than or equal to 0.50 percent of Si, 0.50 to 3.00 percent of Mn, 15.0 to 20.0 percent of Cr, 5.00 to 15.0 percent of Mo, 2.00 to 8.00 percent of W, 5.00 to 15.0 percent of Co, 2.00 to 6.00 percent of Nb, 3.00 to 5.00 percent of Ti and Re, less than or equal to 0.01 percent of S, less than or equal to 0.02 percent of P, and the balance of Ni. The overlaying welding process comprises the following steps: a) before overlaying welding, heating a module body to a temperature of between 400 and 450 DEG C in a heating furnace, and then maintaining the temperature; b) after drawing a charge, placing the module above a tooling, performing overlaying welding by using the surface overlaying welding material, and adoptingan electric heating plate during the overlaying welding to ensure that the temperature between overlaying welding layers is between 350 and 500 DEG C; and c) after the overlaying welding, welding theentire module at a temperature of between 500 and 650 DEG C for 18 to 24 hours, and then performing heat treatment. The surface overlaying welding material and the overlaying welding process adopt a heat resistant alloy material so that the overlaying welding layers have the advantages of excellent high temperature resistance, thermal crack resistance, abrasion resistance and corrosion resistance.

Description

Technical field [0001] The invention relates to a fixed-width side press, in particular to a high-temperature and impact-resistant surface surfacing material and a stack for the surface modification and regeneration repair of metallurgical tools such as side press modules or forging hammers. Welding process. Background technique [0002] With the rapid development of continuous casting and rolling technology, in order to adapt to the frequent adjustment and change of width in the slab rolling process, and to improve the efficiency of hot rolling, the online width adjustment technology of slab large side pressure is widely used in hot rolling production lines. [0003] As an intermediate link between continuous casting and continuous rolling, slab width adjustment technology plays an important role in the entire hot rolling production line. Slab width adjustment usually adopts two methods: vertical rolling mill rolling width adjustment and fixed width side press large side pressure...

AI Technical Summary

Problems solved by technology

[0009] In the 1980s, my country introduced complete sets of fixed-width side press equipment from Japan. The domestic fixed-width side press module manufacturing technology is still relatively backward. Generally, low-alloy integral forged steel is used. After 70,000 tons of on-line rolling, cutting 20mm After continued use, it can be turned 5 times in total. The service life of the module is only about 420,000 tons, and the service life is short and the quality is unstable.

[0010] The traditional imported fixed-width side press module is made of integral ductile iron. Ductile iron has high C content, coarse structure, poor toughness and high temperature resistance, and is prone to crack sensitivity. Surface cracks are prone to occur during use. Short service life, frequent replacement, large amount of cutting after each replacement, which is not conducive to use and maintenance