Micro-alloy weldable cast steel tooth stand and preparation method thereof

Abstract

This invention discloses a kind of microalloy welded cast-steel tooth holder, of which characteristic lies at its chemical composition: C 0.15-0.25wt%,Si 0.3-1.0wt%,Mn 0.6-1.4wt%,Cr 0.4-1.0wt%,B 0.0005-0.007wt%, Al 0.01-0.1wt%,Ce 0-0.045wt%,La 0-0.035wt%,Ti 0-0.1wt%,P<=0.03wt%,S<= 0.03wt%, and the other is iron and inevitable impurity. By double treating, the tooth holder is of moderate intensity and rigidity, high dynamic ductility, good welding performance, is especially suitable for producing tooth holder or root of tooth of digging machine bucket.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to the field of cast steel, in particular to a microalloy weldable cast steel gear seat and a preparation method thereof. Background technique [0002] The tooth base, also known as the tooth root, is one of the important parts of the excavator bucket, which is both a structural part and a wear-resistant part. When working, it is welded to the cutting edge plate at the front end of the bucket by electric welding, and is connected with the detachable bucket teeth through pins to form an excavation assembly. According to the functional analysis of the tooth seat, the tooth seat material should have the following properties: [0003] (1) Good welding performance. The welding of the gear seat and the cutting edge plate mostly occurs on the construction site, and it is required to be able to adapt to the changing welding process conditions and ambient temperature, and the weld seam shoul...

AI Technical Summary

Problems solved by technology

One is normal 35 # Cast steel, the heat treatment process is normalizing and partial quenching of the tooth seat head, 35 # The weldability and wear resistance of the cast steel tooth seat are poor, and the impact toughness and tensile strength are also low. During the service process, welding cracks and tooth seat head fractures often occur. Even if no fracture or crack occurs, due to the surface hardness of the tooth seat head Less than 30HRC and wear too fast, the life of this tooth seat is usually only 1 to 2 months, therefore, 35 # Cast steel cannot meet the material requirements of the tooth seat, but 35 # The manufacturing cost of the cast steel tooth seat is low, the price is cheap, and there is still a certain market share

Another gear seat material is low-carbon medium-low chromium-molybdenum alloy cast steel. The heat treatment process is quenching at 900-950°C and tempering at 500-650°C. Its chemical composition is (w%): C≤0.28, Si0.3~ 0.9, Mn0.6~1.0, Cr0.9~1.2, Mo0.2~0.3, P, S≤0.03, you can also add (w%) Ni1.0 as needed, carbon equivalent CE0.51~0.81, the welding performance is slightly It is obviously insufficient, but it is not difficult to weld with A3 steel or the same low-carbon alloy steel edge plate, and other properties can better meet the requirements of the gear holder material. The disadvantage is that the material cost is high, and the price of the gear holder is high. reduced market competitiveness