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原材料的外观质量、化学成分、低倍组织、脱碳层深度、非金属夹杂物、显微组织(晶粒度)和顶锻试验等7个方面,对摩托车零部件质量的影响均较大。高级优质级别的中碳钢、低中碳合金钢化学成分应达到标准的中上限,且强化元素C、Cr、Mn、Mo等平均含量应高于标准要求的中限。低倍组织中的中心疏松、一般疏松、方形偏析允许≤1.5级,不允许存在白点、缩孔、气泡、翻皮等缺陷。钢材的脱碳层深度应不大于公称直径的1%;显微组织中带状组织0～3级为合格,魏氏组织0～2.5级为合格。摩托车零部件原材料的实际晶粒度应控制在6～8级。
The appearance quality of raw materials, chemical composition, low magnification, depth of decarburized layer, non-metallic inclusions, microstructure (grain size) and upsetting test, etc. have a greater impact on the quality of motorcycle parts . High quality carbon steel, low carbon alloy steel chemical composition should meet the standard upper limit, and the strengthening elements C, Cr, Mn, Mo and other average content should be higher than the standard requirements of the limit. Low magnification center loose, generally loose, square segregation allows ≤ 1.5 level, does not allow the existence of white spots, shrinkage, bubbles, flap and other defects. Depth of decarburization steel should be not more than 1% of the nominal diameter; microstructure of band organization 0 to 3 qualified, Wei organization 0 to 2.5 qualified. The actual grain size of the raw materials of motorcycle parts should be controlled at 6 ~ 8 level.