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简介：N1XS崇信7PQ3XY1D202l不锈钢复合管　　202l不锈钢复合管是国际不锈钢标示方法 202l不锈钢复合管--S20200（AISI，ASTM）国际不锈钢标示方法 美国钢铁学会是用三位数字来标示各种标准级的可锻不锈钢的。其中： ①奥
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