中文无码玩弄人妻

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                常见问题

                套筒原材料采用冷轧精密无缝钢管时为什么需要退火?

                浏览次数:   更新时间:2017-09-11 17:35:00 发布人:管理员

                答:近年来市场上大量应用冷轧精密无缝钢管制作钢筋连接用套筒,这类冷加工钢管强度高、延性低,低温性能差严刑审讯,如果缺乏必要的性能控制,有可也真可怜能成为质量隐患。所以,套筒原材料采用45#钢冷拔或冷轧精密无缝腹黑钢管时,钢管应进行退火处理,满足现行行业标准《钢筋机械连接用套筒》JG/T 163-2013对钢管强度限值和断后伸长率的要求。

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