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URL title:
p11厚壁合金管厂家-350vip葡亰集团
URL description:
p11 厚壁合金管 选择高碳反而有利：碳高石墨结晶晶核多，使石墨球细化，能提高球的圆整度，碳高石墨化膨胀大，使活塞环更致密，可减少缩性，碳高使球墨铸铁更接近共晶成分，有
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