设计改进分三个阶段，即局部几何性应力集中改进、提高铸造质量的纯工艺改进和锻焊组合结构抱轴箱体的设计。
Design improvement is in three stages partial, geometrical stress concentration improvement, pure casting technology improvement and a forge-weld box body design.
降低或取消了钢坯、钢材、未锻轧铝等高能耗、高污染和资源性产品的出口退税。
Conversely tax rebates were cut down or removed on products featured with heavy energy consumption heavy pollution and resource-related such as billet rolled steel and aluminum not forged or rolled.
延展性和可锻性是金属的两种重要加工性能。
Two important working properties of metals are ductility and malleability.
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