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| Production practice of high quality spring steel 55Cr3 for automobile stabilizer bar |
| ZHANG Zheng-lin，CHEN Zhi-liang，WANG Xiang-hong，SUN Guang-tao，TONG Tai-qin |
| （ZENITH Iron and Steel Group， Changzhou 213000， Jiangsu， China） |
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Abstract The following process is carried out to produce 55Cr3 round steel using as high quality automobile stabilizer bar：120 ton converter （BOF）→LF furnace， vacuum RH furnace→220 mm×260 mm rectangular billet continuous casting （CCM）→casting billet anti decarburization coating →hot rolling process. The composition of high carbon and low phosphorus are controlled by the automatic secondary gun of converter and slag detection system. Combining with the high alkalinity control and narrow composition control of the refining LF furnace slag， the high vacuum cycle degassing and sufficient soft blowing time of the vacuum RH furnace， the casting whole protection casting， the mould and the end electromagnetic stirring and the light pressing technology， the technology of decarburization coating spraying， hot rolling， low temperature control rolling and controlled cooling technology on the surface of the billet， the product can achieve high level of composition， organization and surface quality. The content of phosphorus in steel is less than 0.010%， sulfur content is less than 0.006%， oxygen content is less than 10×10－6， inclusions in steel are class A and D inclusions that both are less than Grade 1， surface decarburization is basically zero， occasionally there is sporadic transition decarburization layer， and all the properties meet the requirements of customers.
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Received: 20 July 2018
Published: 29 January 2019
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2018, Vol. 37 
