Most of the steel for line pipe is made by open-hearth, electric furnace, and basic-oxygen processes.
大部分建管道用管子的钢材由平炉、电炉和碱性顶吹转炉生产。
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Present paper introduces basic method of testing electric hoist for service life, taking steel rope electric hoist as an example. It explains relationship between designed service...
Present paper introduces basic method of testing electric hoist for service life, taking steel rope electric hoist as an example. It explains relationship between designed service lif...