Manufacture method of ultra-low-temperature, high-strength and long-fatigue life automobile bridge seamless heterotype axle steel tube

Abstract

The invention relates the method for producing seamless axle steel pipe. The method uses seamless steel pipe billet, and the billet adopts low-alloy high-strength steel, which comprises C 0.14-0.18%, Si 0.3-0.55%, Mn 1.4-1.8%, V 0.02-0.08%, Nb 0.02-0.08%, Ti 0.02-0.08%, and Al 0.015-0.03%. The method comprises the following steps: 1 normalization heat trematment; 2 acid cleaning and lubricating; 3 fluid pressure shaped cold-drawing, thickening four corners of the steel pipe, the rate of the wall thickness and the corner thickness being 1:1.15-1.2; 4 heat treating product. The hardening temperature is 880-950Deg.C, keeping temperature is 20-30min, the cooling temperature is 350-450Deg.C, drawing temperature is 500-600Deg.C, and keeping temperature is 40-60min. The invention has homogeneous integral structure property and strong combination mechanics property.

Description

Technical field: [0001] The invention relates to a method for manufacturing a seamless special-shaped axle steel pipe for an automobile bridge. Auto bridge seamless special-shaped axle steel pipes are used in container special vehicles, heavy and medium-sized vehicles, railway vehicles, industrial and mining vehicles, etc. It belongs to the technical field of metal material processing and heat treatment. Background technique: [0002] The automobile industry is one of the country's pillar industries. With the rapid development of the national economy, the demand for transportation, especially container special vehicles and heavy and medium-sized vehicles, is increasing year by year. Logistics transportation vehicles have to travel all over the country, work under various climatic conditions, and work under heavy loads and low-temperature impact fatigue loads for a long time. The special-shaped axle steel pipe of the automobile bridge is the key component that mainly bears ...

AI Technical Summary

Problems solved by technology

[0009] 1. There is inhomogeneity in the structure and properties in the welding process of welded and formed axle steel pipes, and the mechanical properties of the welding heat-affected zone are weak

[0010] 2. The corners of the welded and formed axle steel pipes cannot be thickened, and the overall rigidity of the steel pipes is not high

[0011] 3. Without high temperature quenching and tempering process, the comprehensive performance cannot be improved and guaranteed

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