Controlled rolling method for improving bearing steel core micro-holes
A technology of bearing steel and porosity, which is applied in the field of bearing steel manufacturing to achieve the effects of refining grains, improving metal inclusions, and reducing the amount of cutting heads and tails
Active Publication Date: 2021-05-28
LIANFENG STEEL (ZHANGJIAGANG) CO LTD
View PDF5 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In view of the above deficiencies, the purpose of the present invention is to provide a controlled rolling method for improving the micropores of the bearing steel core, to solve the problem of a large number of micropores in the prior art, and to improve the pass rate of flaw detection of bearing steel products
Method used
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
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0033] The present invention will be described in further detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0034] A controlled rolling method for improving the micropores of the bearing steel core,
[0035] (1) Control blank quality
[0036] When the continuous casting slab is accepted, the shrinkage cavities and pits found at the end are welded;
[0037] Weld the steel billets with shrinkage cavities and pits at the end to prevent the shrinkage cavities and pits at the end from being oxidized during the heating process of the alloying elements Mn and Cr in the billet, which will cause internal inclusions in the product after rolling, and at the same time reduce rolling. During the production process, the amount of head and tail cutting can be reduced to improve the yield of the product.
[0038] (2) Controlled rolling spec...
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 PUM
Login to View More Abstract
The invention discloses a controlled rolling method for improving bearing steel core micro-holes. The controlled rolling method comprises the following steps that solid welding treatment is carried out on shrinkage cavities and pits in the end parts of continuous casting billets; steel billets are selected from the continuous casting billets subjected to solid welding treatment according to rolling specifications, and heating is carried out on the steel billets; high-pressure water descaling is carried out on the heated steel billets; primary rough rolling is carried out on the steel billets subjected to high-pressure water descaling; secondary rough rolling, intermediate rolling and finish rolling are sequentially carried out on the steel billets subjected to primary rough rolling under the protection condition of a head removing roller way; and a bar after rolling is finished is fed into a cooling bed to be slowly cooled and collected, and the bearing steel with the steel core free of the micro-holes is obtained. According to the method, low-temperature controlled rolling is achieved, the internal microscopic structure of a rolled material is improved, and the flaw detection qualification rate is increased.
Description
technical field [0001] The invention relates to the field of bearing steel manufacturing, in particular to a controlled rolling method for improving micropores in the core of bearing steel. Background technique [0002] Bearing steel is one of the most stringent steel types in all steel production. According to the GB / T 18254-2016 national standard on microporosity of bearing steel, microporosity is not allowed if the nominal diameter is less than or equal to 60mm. However, the current microporosity is one of the common internal structural defects of bearing steel, which has a great impact on the processing, performance and life of the product. The existing Φ50~70mm GCr15 bearing steel products were found during ultrasonic flaw detection. The larger the manufacturing specification, the lower the qualified rate of flaw detection. Metallographic analysis of flaw detection defects shows that the defects are all microscopic pores. Contents of the invention [0003] In view of...
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 Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00
CPCB21B37/00
Inventor 陈豪朱爱华王涛付少帅
Owner LIANFENG STEEL (ZHANGJIAGANG) CO LTD