Process for compound treating heat spraying and depositing welding and products thereof

Abstract

The invention relates to a surface hardening processing method and its product, especially for hot spraying and repair welding composite processing method and its product. It solves the problem that coating can not match with basal body performance. Its technical proposal is as follows: repair welding transition layer on basis material surface; spraying hot spraying coating on the layer; repair welding transition layer includes priming coat and surface layer. The formed product has composite structure. The basal material surface is repair welding transition layer. Its surface is hot spraying coating. The priming coat is welded on basal body. The surface is between hot spraying coating and the priming coat. The invention can be applied to surface protection coating of steel enterprise cold rolling production line jockey roller.

Description

Technical field: [0001] The invention relates to a surface hardening treatment method and its products, in particular to a thermal spraying and surfacing composite treatment method and its products, which can be applied (but not limited to) to the surface protective coating of tension rolls in cold rolling production lines of iron and steel enterprises . Background technique: [0002] At present, the key components of the hot-dip galvanizing unit tension roll used in the domestic high-grade steel plate cold rolling production line (such as Baosteel 1800) can only rely on imports, which not only significantly increases the economic cost, but also becomes a potential factor restricting the improvement of product quality and production efficiency. [0003] The roller body of the tension roller is made of S50C steel plate, with a size specification of Φ1000mm×2100mm; after the intermediate frequency quenching of the roller surface, a hard chromium layer with a thickness of about...

AI Technical Summary

Problems solved by technology

But at the same time, the manufacture of imported tension rollers has obvious deficiencies in the following two aspects: First, when the surface of this type of tension roller is subjected to intermediate frequency quenching, it must be Large-scale vertical surface induction hardening equipment; since there is no large-scale vertical surface induction hardening equipment in China, it is restricted by the conditions of mechanical equipment, so it can only rely on imports from abroad

At the same time, this kind of tension roller is made of steel plate coiled and tailor-welded, and there are obvious differences in the structure of the weld seam and welding heat-affected zone and the roll surface body; therefore, after the roller is surface induction hardened, the mechanical properties of the weld seam area Often differs from other areas of the roll surface and is a potential cause of roll surface coating failure

Second, the electroplated chrome layer on the surface of this type of tension roller also has its own shortcomings in terms of performance, such as low hardness and poor wear resistance; there are micro-cracks in the chrome-plated layer and poor corrosion resistance; it is difficult for the chrome-plated layer to maintain the integrity of the whole Performance Stability and Uniformity

The reason is that if the thermal spray coating with extremely high hardness is directly sprayed on the roller base material S50C with very low hardness, in the working process, due to the hardness of the thermal spray coating and the surface of the roller to which it is attached does not have a suitable The degree of matching is very easy to cause the failure of the surface coating

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