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    冷拔无缝钢管生产控制措施包括什么

    2018-12-10 09:15:35 无锡盛发地坪科技有限公司 阅读

    冷拔无缝钢管生产控制首先就是提高钢管的塑韧性,提高钢水的洁净度,减少有害夹杂,提高钢管的整体质量。在生产过程中采用合理的冷却制度,避免内部出现裂纹,从多方面出发提高冷拔无缝钢管的质量。冷拔无缝钢管在生产过程中合理控制加热温度,通过测定热塑性曲线,选择最佳的加热温度。管坯加热还要注意有足够的保温时间,以降低变形抗力和提高45#结构冷拔无缝钢管塑韧性。

    The production control of cold-drawn seamless steel pipes is to improve the plasticity and toughness of steel pipes, improve the cleanliness of molten steel, reduce harmful inclusions and improve the overall quality of steel pipes. In the production process, reasonable cooling system is adopted to avoid internal cracks and improve the quality of cold-drawn seamless steel tube from many aspects. The heating temperature of cold-drawn seamless steel pipe is reasonably controlled in the production process, and the optimum heating temperature is selected by measuring the thermoplastic curve. In order to reduce the deformation resistance and improve the plastic toughness of 45# cold-drawn seamless steel tube, sufficient heat preservation time should be paid attention to when the tube billet is heated.

    冷拔无缝钢管的生产过程需要的程序比较多,最后一步是降低轧辊转速,轧辊转速是穿孔工艺的关键参数,轧辊转速由低向高变化过程中,存在一个开始出现分层的临界轧辊转速。轧辊转速较低时,管坯容易形成孔腔;轧辊转速较高时,管坯和45#结构冷拔无缝钢管容易形成分层缺陷。为了消除管坯和45#结构用无缝钢管分层缺陷,应把轧辊转速降低到开始出现分层的临界轧辊转速以下。

    The last step is to reduce the roll speed. Roll speed is the key parameter of piercing process. In the process of changing the roll speed from low to high, there is a critical roll speed that begins to appear layered. When the roll speed is low, the billet is easy to form holes; when the roll speed is high, the billet and 45# cold-drawn seamless steel pipe are easy to form delamination defects. In order to eliminate the delamination defect of seamless steel tube for billet and 45# structure, the roll speed should be reduced to below the critical roll speed when delamination begins to occur. 



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