侧架是敞车的重要部件之一,形状特殊,断面较薄,技术条件要求高,机 械性能要符合苏联优钢的规格。主要要求如下:1．化学成分:碳0．2~0．3%,锰0．5~0．6%,矽0．17~0．37%,硫、磷 碱性炉钢<0.05%,酸性炉钢<0．06%; Side frame is an important part of gondola car, one special shape, thin section, high technical requirements, mechanical properties to meet the specifications of the Soviet Union excellent steel. The main requirements are as follows: 1. Chemical composition: carbon 0.2 ~ 0.3%, manganese 0.5 ~ 0.6%, silicon 0.17 ~ 0.37%, sulfur and phosphorus alkaline furnace steel <0.05%, acid furnace <0. 06%;