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用１６Ｍｎ 低合金结构钢和３５ 普通碳素钢，通过适当热处理生产金属顶梁，使其达到ＭＴ３０ － ９２ 行业标准。
With 16Mn low-alloy structural steel and 35 ordinary carbon steel, metal roof beams are produced by appropriate heat treatment to achieve the MT30 - 92 industry standard.