Grade-90 chain steel

Abstract

The invention relates to grade-90 chain steel. The grade-90 chain steel is prepared from the following chemical components by weight percent: 0.20 to 0.24 percent of C, 0.15 to 0.35 percent of Si, 0.90 to 1.30 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.20 percent of Cu, 0.40 to 0.55 percent of Ni, 0.45 to 0.65 percentof Cr, less than or equal to 0.10 percent of Mo, 0.025 to 0.050 percent of Alt, and the balance of Fe and unavoidable impurities. Compared with the brand number corresponding to the national standardand European standard, the grade-90 chain steel disclosed by the invention ahs the following advantages: (1) the contents of C and Mn are increased, the cost is slightly increased, and the strength and hardness of the material are greatly improved; (2) the content of Ni is reduced, no Mo element is added, and the cost is greatly reduced; and (3) by reasonably optimizing the alloy elements, on thepremise of ensuring the qualification of breaking strength of the material, the welding performance of the material is also considered, and the cost of raw materials are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and processing, and relates to a composition design of a chain steel, in particular to a composition design of a 90-grade chain steel. Background technique [0002] Class 90 chains are designed with MnCrNi low-alloy steel, and the products are mainly used in high-standard manual hoists and electric hoists. Since the products are mostly used in the lifting industry, safety is of the utmost importance. Therefore, there are high requirements for the strength, toughness and deformation resistance of raw materials. At present, the widely used standards in China are the national standard GB / T 10560-2017 "Steel for Mining Welded Circular Link Chains" and the European Standard DIN 17115-2012. There are two technical standards, but there are no suitable grades in these two standards for the production of 90-grade chains. Both the national standard and the European standard use Mn+Cr+Ni...

AI Technical Summary

Problems solved by technology

Both the national standard and the European standard use Mn+Cr+Ni+Mo to produce high-strength lifting chains, but this design has a high content of Ni alloy and the addition of Mo element, the cost of the alloy is high, and the market competitiveness is poor

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