High-hardenability 35SiMnCrMoB steel for wear-resistant parts of engineering machinery and manufacturing method of high-hardenability 35SiMnCrMoB steel

Abstract

The invention relates to high-hardenability 35SiCrMnMoB steel for wear-resistant parts of engineering machinery. The high-hardenability 35SiCrMnMoB steel comprises the following chemical components in percentage by weight: 0.32 to 0.38 percent of C, 1.20 to 1.50 percent of Si, 1.20 to 1.40 percent of Mn, 1.00 to 1.30 percent of Cr, 0.020 to 0.050 percent of Ti, 0.0010 to 0.0040 percent of B, 0.20 to 0.30 percent of Mo, less than or equal to 0.010 percent of S, less than or equal to 0.025 percent of P, less than or equal to 0.20 percent of Cu, less than or equal to 0.020 percent of Al, less than or equal to 0.0060 percent of N and the balance of Fe and inevitable impurities. The invention discloses high-hardenability hot-rolled round steel and a manufacturing method. The hardenability of the steel meets the requirement that J25 is larger than or equal to 48 HRC, and the high-hardenability hot-rolled round steel is used for manufacturing engineering machinery wear-resistant parts subjected to quenching and low-temperature tempering treatment. The high-silicon design can significantly improve the hardness of the quenched and tempered surface of the steel while ensuring the improvement of the hardenability, and improves the wear resistance.

Description

technical field [0001] The invention belongs to the technical field of special steel smelting, and in particular relates to a high-hardenability 35SiMnCrMoB steel material for wear-resistant parts of construction machinery and a manufacturing method. Background technique [0002] Wear-resistant parts such as excavator shovel teeth and chisel rods in construction machinery are usually made of hot-rolled round steel after forging, and are often made of general alloy structural steel and carbon steel. In order to meet the harsh environment and heavy loads in the use of large-scale construction machinery, the strength will be further improved by adding V, Ti, Nb, etc. on the basis of existing carbon steel or bonded steel. In recent years, B has been used to greatly improve hardenability While improving the performance, the cost has been greatly reduced, and a large number of B-containing steels have been developed. [0003] Patent No. CN201210087346.0 discloses a high-strength ...

AI Technical Summary

Problems solved by technology

However, due to the low content of C, Si, and Cr in the patented steel, the hardenability is low, which is not enough to meet the requirements of large-scale wear-resistant parts