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为了满足军工需要,西南铝加工厂锻造分厂试制成功国内直径最大的((?)556/(?)424mm)919合金厚壁管材.该产品的尺寸精度与各项性能的要求极为严格,生产难度相当大.该分厂急
In order to meet the needs of the military, Southwest Aluminum Processing Plant forging branch trial production of the domestic largest diameter ((?) 556 / (?) 424mm) 919 alloy thick-walled pipe.The dimensional accuracy of the product and the performance of the extremely strict requirements of the production The difficulty is quite large