—、国外概况 国外低合金结构钢的共同特点是,低碳、低合金、高强度、高韧性、良好的焊接性和耐蚀性、较高的冲击韧性以及较低的时效敏感性。 德国奥伦斯坦·科佩尔公司挖掘机主要零件用材料见表1。德马克公司生产的挖掘机一般采用St52钢板,其他主要受力构件和易损件用材料见表2。利勃海尔公司用St52钢,日本小松及日立建机公司用SM50钢。 -, Foreign profiles Common features of foreign low-alloy structural steel is low carbon, low alloy, high strength, high toughness, good weldability and corrosion resistance, high impact toughness and lower sensitivity to aging. The main parts of the excavators used by the company Orenstein Kopel in Germany are listed in Table 1. The excavators made by DMG generally adopt St52 steel plate, and the other main force components and wearing parts are shown in Table 2. Liebherr used St52 steel, Japan’s Komatsu and Hitachi Construction Machinery Co., Ltd. used SM50 steel.