Steel for hydraulic breaking hammer piston and manufacturing technology of steel

Abstract

The invention relates to steel for a hydraulic breaking hammer piston and a manufacturing technology of the steel. The steel for the hydraulic breaking hammer piston is high-alloy steel SNCM26VMOD andmainly comprises the chemical components of, by weight, 0.14-0.25% of C, 0.15-0.35% of Si, 0.80-1.20% of Mn, 3.25-3.65% of Ni, 1.40-1.80% of Cr, 0.40-0.60% of Mo, 0.05-0.15% of V, 0-0.025% of S, 0-0.025% of P, and the balance Fe and inevitable impurity elements. The manufacturing technology of the steel for the hydraulic breaking hammer piston comprises the steps of electric-arc furnace smelting,LF refining, VD refining, electroslag remelting, forging and heat treatment after forging. The high-strength high-toughness piston material is manufactured through the steel and the manufacturing technology, the situation that the center of the piston is sunken is avoided, the piston breaking situation is greatly decreased, and the service life of the piston is prolonged.

Description

technical field [0001] The invention belongs to the technical field of breaker piston production, and in particular relates to a steel for a hydraulic breaker piston and a manufacturing process thereof which can avoid the appearance of a piston concave, greatly reduce the breakage of the piston, and improve the service life of the piston. Background technique [0002] The hydraulic breaker belongs to a new type of high-efficiency hydraulic impact vibration machine tool. It is a supporting working part of the excavator or loader. Hit the drill rod and do work externally. It is used in many fields such as mining, metallurgical industry, municipal engineering, construction, road and railway. [0003] Among them, the key part of the piston breaker, the piston of the breaker has a continuous high-speed relative reciprocating motion with the cylinder during work, and there is severe friction between the reciprocating movements, and the lower end face frequently hits the drill rod ...

AI Technical Summary

Problems solved by technology

[0004] In addition, at present, the pistons of breaking hammers are mostly made of low-carbon alloy carburizing steel and medium-carbon alloy carburizing steel, which have the disadvantages of low tensile strength and low core strength after heat treatment of the material. In this case, the piston is prone to concavity on the end face and upsetting at the end

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