Spring steel material with high strength and high hardenability

Abstract

The invention provides a spring steel material with high strength and high hardenability. The spring steel material comprises the following components in percentage by weight: 0.50%-0.55% of C, 0.90%-1.20% of Mn, 0.80-1.10% of Si, 0.10%-0.20% of V, 0.90%-1.10% of Cr, 0.010%-0.040% of Nb, less than or equal to 0.03% of P, less than or equal to 0.03% of S and the rest of Fe. Compared with spring steel 52CrMnBA, the spring steel material has higher yield strength; and compared with spring steel 60CrMnBA, the spring steel material has less quenching cracking tendency and low economical price. The spring steel material has high hardenability, high toughness performance and low quenching cracking tendency and is the optimal choice for a high toughness elastic element with a large cross section so that the design stress of the spring steel is increased from 370-430MPa of a domestic common material to 600-700MPa. The spring steel material is particularly suitable for a steel plate spring with the thickness of larger than or equal to 20mm and less than or equal to 42mm.

Description

technical field [0001] The invention relates to a spring steel material, in particular to a spring steel material with high strength and high hardenability. It is suitable for the manufacture of spring elements with large cross-section and high stress, especially for leaf springs with a thickness ≥ 20 mm and ≤ 42 mm. Background technique [0002] At present, there are mainly 60CrMnBA, 52CrMnBA, 51CrV4 and other varieties of high-stress and high-strength spring steel materials commonly used in China for manufacturing large cross-sections. 60CrMnBA has the characteristics of high strength and high hardenability, but it has a high tendency of quenching and cracking. At present, the use of this material has been basically stopped in China. Although 52CrMnBA material has high toughness and hardenability, its yield strength cannot meet the high requirements of current products. Stress and lightweight design requirements, these material varieties can only be used in the developmen...

AI Technical Summary

Problems solved by technology

60CrMnBA has the characteristics of high strength and high hardenability, but it has a high tendency of quenching and cracking. At present, the use of this material has been basically stopped in China. Although 52CrMnBA material has high toughness and hardenability, its yield strength cannot meet the high requirements of current products. Stress and lightweight design requirements, these material varieties can only be used in the development of products with design stress in the range of 370-430MPa

Images