Banded structure control method, gear steel and formula thereof

A banded structure and control method technology, applied in the field of steel manufacturing, can solve the problem of reducing the banded structure of gear steel
CN110315044AActive Publication Date: 2019-10-11BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
15 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
Publication Date
2019-10-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to the field of steel manufacturing, in particular to a banded structure control method, gear steel and a formula thereof. The banded structure control method comprises the stepsthat molten steel forms a casting blank through continuous casting by a crystallizer at constant pull speed; diffusion heating is conducted on the casting blank at the temperature of 1225-1255 DEG Ctill surface temperature and core temperature of the casting blank are even; and rolling of the down-pressing rate of 20%-30% is conducted on the casting blank obtained after diffusion heating at thetemperature of 1085-1205 DEG C. The continuous casting process, the diffusion heating process and the rolling process are controlled, austenite of the gear steel is fully deformed and homogenized fromthe surface to the core, and fine and even austenite particles are formed. Even-structure ferrite can be formed at the core and surface of the gear steel, and the banded structure is smaller than orequal to 2.0 grade.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The application relates to the field of iron and steel manufacturing, in particular, to a band structure control method, gear steel and its formula. Background technique

[0002] The banded structure makes the mechanical properties of the steel directional, and reduces the transverse ductility and reduction of area of ​​the steel. Severe banded structure increases the difficulty of forging, heating and processing of gear parts, which leads to large heat treatment deformation of gears, and ultimately reduces gear performance and fatigue strength, or leads to scrapping of gear parts. With the increasing quality requirements of automotive gears, the requirements for the banded structure of steel are also higher. Some manufacturers with high performance requirements for gear steel have proposed that the banded structure of steel is not allowed to exceed level 2.

[0003] However, at present, for some gear steels with low sulfur content, the method of redu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More