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The Raw Material Factors Influencing the Parts Quality of Motorcycles

Zhang Xianming(No.7412 Plant,Zhoushan Zhejiang)  
The 7 aspects,such as the appearance quality,macrostructure chemical constitution,depth of decarbonized layer,non-metallic inclusions,fibrous tissue(grain size) and upsetting test hare greater influence upon the ports quality of motorcycles.The chemical constitution of high-class high quality medium carbon steel, low carbon alloy steel should reach the medium and superior limits specified in the standards and the average contents of the intensified elements C,Cr,Mn,Mo should be higher than the medium limit in the standard.The central loose,general loose and square segregation are allowed to be≤1.5 with flakes,shrinkage holes,air bubbles,skull patch not allowed.The depth of decarbonizes layer of the steel should.mot be greater than 1%of the nominal diameter;the banded structure in the fibrous tissue of 0~3 grade is considered to be qualified,the widmanstatten structure of 0~2.5 is taken as qualified.The grain size of the raw materials for motorcycle should be controlled in 6~8 grade.
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