Ultra-high-strength spring steel used for manufacturing single piece or few pieces of variable section plate springs and preparation method of ultra-high-strength spring steel

Abstract

The invention discloses ultra-high-strength spring steel used for manufacturing a single piece or few pieces of variable section plate springs and a preparation method of the ultra-high-strength spring steel and relates to the field of steel and iron materials. The ultra-high-strength spring steel is mainly invented to solve the problems that existing high-strength spring steel for few pieces of variable section plate springs is low in yielding strength, tensile strength and the like. The chemical components of the ultra-high-strength spring steel comprise, by weight percentage, 0.48-0.54% ofC, 0.8-1.2% of Si, 0.7-1.0% of Mn, 0.8-1.1% of Cr, 0.08-0.15% of V, 0.02-0.05% of Nb, 0.0010-0.0030% of B, smaller than or equal to 0.01% of Ni, smaller than or equal to 0.01% of S, smaller than or equal to 0.015% of P, smaller than or equal to 0.0050% of N, smaller than or equal to 0.0010% of O, smaller than or equal to 0.0001% of H, and the balance Fe and impurities. The preparation method includes the steps of molten iron pre-treatment, converter steelmaking and refining; continuous casting; hot rolling; and quenching and intermediate temperature tempering. The beneficial effect is that theyielding strength and the tensile strength are high.

Description

Technical field: [0001] The invention relates to the field of iron and steel materials, in particular to an ultra-high-strength spring steel for manufacturing a single or a few variable-section leaf springs and a preparation method thereof. Background technique: [0002] With the rapid development of the automobile industry, under the background of reducing fuel consumption and protecting the environment, automobile lightweight has become a mainstream trend. In addition to optimizing the structure of auto parts, the realization of automobile lightweight is to use high-strength steel for the production of auto parts. Leaf springs are an important part of the suspension of trucks, trucks and buses, bearing and transmitting forces and moments between the frame and the axle. As a key elastic element, the leaf spring has been widely used due to its simple structure and easy manufacture, and it is an indispensable part to ensure the good performance of the chassis. According to ...

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Problems solved by technology

[0004] At present, there are 50CrMnVA steel, 50CrVA steel, 60Si2Mn steel, 50CrV4 steel, 51CrMoV4 steel, etc., which are common high-strength spring steels for small-piece variable-section leaf springs at home and abroad. Although they are widely used in the manufacture and production of variable-section leaf springs, their The yield strength is mostly below 1500MPa, and the tensile strength is mostly below 1800MPa. It can only be applied to the production of small-piece variable-section leaf springs, and cannot be applied to the production of single-piece variable-section leaf springs.

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