Corrosion-resistant steel for chain plates and manufacturing method of corrosion-resistant steel

Abstract

The invention provides corrosion-resistant steel for chain plates and a manufacturing method of the corrosion-resistant steel. The corrosion-resistant steel for the chain plates is prepared from the following components in percentage by weight: 0.40%-0.70% of C, 0.1%-0.40% of Si, 0.50%-1.0% of Mn, 0.1%-0.5% of Cr, 0.1%-0.5% of Cu, 0.03% -0.2% of Sb, 0.015%-0.050% of Al, 0.02%-0.3% of Sn, less thanor equal to 0.035% of impurity element P, less than or equal to 0.010% of S, the balance of Fe and inevitable impurities. The manufacturing method of the corrosion-resistant steel comprises the stepsof smelting, continuous casting, rolling and cold rolling. The stamping yield of the corrosion-resistant steel for the chain plates is as high as over 98%, the depth of a decarburized layer on the surface of the steel plate is less than or equal to 0.02 mm, the hardness is uniform after heat treatment, the performances of fatigue and impact resistance and the like meet the requirements, the corrosion resistance is obviously improved, and the average corrosion rate is less than 25g / m<2>.h.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a cold-rolled steel strip for corrosion-resistant chain plates and a manufacturing method thereof. Background technique [0002] At present, the chain plates are mostly processed by 40Mn and 45Mn steel plates, and the surface hardness of the steel plates is generally required to be 85HRB-90HRB to ensure the quality of the stamped rear edge. The hot-rolled plate is directly processed into the chain plate, and there are defects such as iron scale on the surface of the steel plate, which is easy to rust during the process, and the yield of the stamping process is low, which affects the surface hardness after heat treatment. [0003] The patent "Steel for Circular Chains and Its Manufacturing Method" (CN102653834A) discloses that circular chains are processed with profiles. The carbon content of the steel for the chains is low, and the conventional heat treatment proces...

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Problems solved by technology

[0007] The 16Mn chain steel introduced in "Fracture Analysis of 16Mn Steel Chain Plate" has low carbon content and needs to be carburized to meet the hardness requirements. The process is complicated

[0008] The steel types mentioned in the above documents and inventions are not suitable for direct processing of hot-rolled plates to manufacture chain plates

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