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[CN 201710889577.6] Steel for piston of hydraulic breaking hammer and manufacturing process thereof
[CN 201710889577.6] A kind of steel for hydraulic hammer piston and its manufacturing process Title: A kind of steel for hydraulic hammer piston and its manufacturing process Application No.: CN 201710889577.6 Applicant: Zhongyuan Special Steel Co., Ltd. Application Date: 2017-9-27 Patent Type: Invention Application The present invention relates to a kind of steel for hydraulic hammer piston and its manufacturing process, a kind of steel for hydraulic hammer piston, which is in the SNCM26VMOD of high alloy steel, its chemical composition measured by weight percentage mainly includes: C = 0.14-0.25%, Si = 0.15-0.35%, Mn = 0.80-1.20%, Ni = 3.25-3.65%, Cr = 1.40-1.80%, Mo = 0.40-0.60%, V = 0.05-0.15%, S≤ 0.025%, P≤ 0.025%, and the rest is Fe and inevitable impurity elements; the manufacturing process of the steel for the piston of the hydraulic breaking hammer, the entire process steps include electric arc furnace smelting, LF refining, VD refining, electroslag remelting, forging and post-forging heat treatment. The high-strength and high-toughness piston material is manufactured by the present invention to avoid The appearance of the piston concave center greatly reduces the piston fracture and improves the service life of the piston.
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