The causes of inner transversal crack of cold - draw heavy wall pipe of 45 steel were analyzed.

通过提高管坯质量和改进拉拔、中间退火工艺,使厚壁管内横裂缺陷基本消除.

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The company has now the cold draw profession advanced production equipment and strong technology productivity.

公司拥有当今冷拔行业先进的生产设备和较强的技术生产能力.

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The drawing force, rational wall - thickness reduction and the characteristics of cold - draw process and equipment are analyzed.

分析了拔管时的拔制力 、 合理减壁率及冷拔工艺与设备特点.提出了全面控制工艺系统精度是提高产品质量的关键.

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