Analysis and quality control of surface black line defect of welded bottle steel HP295
According to the customer feedback,the black line defect on the surface of welding bottle steel HP295 leads to the wrinkle after stamping.This paper introduces the main technological process of gas bottle production,expounds the material and rolling process of welding bottle steel HP295,describes the morphological characteristics of black line defect and the surface wrinkle after stamping,and studies the causes of black line defect on the surface of welding bottle steel HP295 by means of metallographic analysis,energy spectrum analysis and comparative anal-ysis.The results show that the black line on the surface of HP295 steel plate of welding bottle steel in inspection and analysis is a defect produced in the early stage of rolling,and it is reflected as black line after being rolled in the process of over-rolling,which is mainly caused by foreign bodies pressing in and defects such as surface cracks,sub-cutaneous bubbles and holes on the billet.Combined with the actual control situation of the production plant,the oc-currence rate of black line defects on the surface of HP295 was effectively controlled by organizing collaborative op-timization,controlling the surface quality of billet in steelmaking process,cleaning production maintenance and e-quipment precision control in hot rolling process,and the total defect rate was controlled within three thousandths acceptable to users from 2％before tackling key problems,which met the use requirements of customers.
welding bottle steel HP295black linefoldbillet qualityforeign body impingement
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