汽车前工字梁是承受压力、拉力和冲击力的重要部件,过去都用钢材锻造,需要有高吨位锻造设备才能生产。新疆军区生产建设兵团通用机械厂广大革命职工,在毛主席关于“独立自主、自力更生”的方针指引下,破除迷信,解放思想,反复试验,成功地用球墨铸铁代替45号钢,造出了解放牌汽车前工字梁。产品的抗拉强度达到45～50公斤/毫米~2,延伸 I-beams in front of automobiles are important components that are subjected to pressure, tension, and impact. In the past, they were all forged using steel and high-tonnage forging equipment was required to produce them. Under the guidance of Chairman Mao’s principle of “independent, self-reliant”, the majority of revolutionary workers of the Xinjiang Military Region Production and Construction Corps General Machinery Plant broke the superstition, emancipated the mind, and repeatedly tried to replace the 45th steel with ductile iron successfully, creating a liberated brand. Car front I-beam. The tensile strength of the product reaches 45-50 kg/mm~2, extending