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1.前言实现农业机械化需要大量钢铁材料。在具有相当机械化水平的国家,每年用于拖拉机和农机的钢材约占机械制造部门用钢的20％。农机具用钢量与拖拉机用钢量之比,一般为1.5～2.5∶1。农机具用钢不仅用量
1. Introduction Mechanization of agriculture requires a large amount of steel material. In countries with fairly mechanized levels, the annual steel used for tractors and agricultural machinery accounts for about 20% of the steel used in the machinery manufacturing sector. Agricultural machinery with steel and tractor steel ratio, generally 1.5 ~ 2.5: 1. Agricultural machinery with steel not only the amount