Spring steel round steel and production process thereof

Abstract

The invention belongs to the field of metallurgy and discloses spring steel round steel and a production process thereof. The spring steel round steel comprises the following components in percentage by weight: 0.56 to 0.64 percent of carbon (C), 1.60 to 2.00 percent of silicon (Si), 0.70 to 1.00 percent of manganese (Mn), less than or equal to 0.025 percent of phosphorus (P), less than or equal to 0.025 percent of sulfur (S), 0.15 to 0.35 percent of chromium (Cr), less than or equal to 0.35 percent of nickel (Ni), less than or equal to 0.25 percent of copper (Cu) and the balance of Ferrum (Fe). The production process comprises the following steps of: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling. The spring steel round steel of the invention has the characteristics of low alloying element content, low decarburizing tendency, high temper resistance, high hot-working performance, low cost, high performance after heat processing and the like of a common round steel; besides, the spring steel round steel simultaneously has high cold workability under the condition of air cooling after rolling. The process ensures that the rolled spring steel round steel obtains a texture of pearlite and a small number of ferrolites under the condition of air cooling, and has high plasticity and toughness during cold working, and every performance can meet the requirements of GB / T1222 after heat processing.

Description

technical field

[0001] The invention belongs to the field of metallurgy and relates to a steel and a production process thereof, in particular to a spring steel round bar and a production process thereof. Background technique

[0002] Spring steel 60Si2MnA has low content of alloying elements, low decarburization tendency, good tempering stability, good thermal processing performance, low cost, and excellent performance after heat treatment. It is widely used in industries such as automobiles, railways and construction machinery. However, when producing round steel, reticulated ferrite is often precipitated first under air-cooling conditions, resulting in a serious decrease in plasticity and toughness. The cold working process is easy to break, which is easy to cause personal injury, and hot working increases a lot of heat treatment costs. Contents of the invention

[0003] The technical problem to be solved by the present invention is: aiming at the shortcomings of the ab...