Steel for heavy-duty loader tire protecting chain and production method thereof

Abstract

The invention discloses steel for a heavy-duty loader tire protecting chain and a production method thereof. The steel is composed of, by mass, 0.35-0.42% of C, 0.70-1.10% of Si, 0.85-1.20% of Mn, 0.035% P or less, 0.035% of S or less, 0.40-0.60% of Cr, 0.008-0.015% of Tal and the balance Fe and inevitable impurities. The protecting chain utilizes Si element to significantly improve the steel yield point, tensile strength, the quenching temperature, the hardenability, the corrosion resistance and antioxidant capacity through combining with Cr element; Mn element is utilized to improve the hardenability and refine a pearlite; Cr element is utilized to slow down the decomposition speed of an austenite, improve the hardenability, promote formation of a passive film on the surface of steel and improve the corrosion resistance of the steel; and Al element is utilized to reduce the sensitivity of the steel to a gap, refine the natural steel grain and increase the temperature of grain coarsening. According to the steel for the heavy-duty loader tire protecting chain and the production method thereof, the Rockwell hardness reaches to 55 or more, wear resistance is good, a converter and continuous casting production can be used, adding of precious metal elements is not needed, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a steel for a tire protection chain of a heavy-duty loader and a production method thereof. Background technique [0002] The working environment of heavy-duty loaders is harsh. During loading operations, the front wheels are often idling, and the tires are directly rubbed with stones, which leads to serious tire wear; sharp stones can easily puncture the tires. Heavy-duty loading machinery tires are expensive and need to be replaced. It takes a long time. Once damaged, not only the economic loss is huge, but also the loading operation rate is reduced. [0003] At present, the steel grades used for tire protection chains are various, and various protection chain manufacturers choose from existing steel grades according to their own convenience, such as steels for marine mooring chains 27CrMnMo, 40Cr, 20CrMnTi, 20Mn2, 40Mn2, etc.; but these protection chains The...

AI Technical Summary

Problems solved by technology

[0002] The working environment of heavy-duty loaders is harsh. During loading operations, the front wheels are often in an idling state, and the tires are directly rubbed against stones, causing serious tire wear; sharp stones can easily puncture the tires, and heavy-duty loading machinery tires are expensive. Replacement It takes a long time, once damaged, not only the economic loss is huge, but also the loading operation rate is reduced

[0003] At present, there are various types of steel for tire protection chains, and each protection chain manufacturer chooses from existing steel types according to their own convenience, such as 27CrMnMo, 40Cr, 20CrMnTi, 20Mn2, 40Mn2, etc. for marine mooring chains; but these protection chains The production cost is high, the performance is uneven, and the steel type is not specially designed for tire chains, which cannot fully meet the working environment of heavy loaders and cannot meet its wear resistance requirements

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