The invention discloses a method for heat treatment of thick plates by an extra-thick plate quenching line. The method comprises the control of quenching water distribution in the low pressure section of the steel plate, the control of temperature difference between the head and the tail of the steel plate entering the quenching machine and the temperature control of the steel plate entering the quenching machine. The invention realizes the purpose of saving water and reducing production cost by controlling the distribution of quenching water for low pressure section of steel plates with different length and specifications; solves the problem of large performance difference caused by large temperature difference between the head and tail of the steel plate entering the quenching machine by controlling the temperature difference between the head and tail of the steel plate entering the quenching machine; and improves the steel plate by adjusting the speed of steel transportation. The temperature of the quenching machine is realized, and the NAC function of the thick plate quenching machine is realized at the same time. The invention realizes the production of steel plate with thickness of 80-300 m m, greatly improves the pass rate of the plate shape, increases the pass rate of the plate shape from 53% to 98%, realizes the free-compression flattening of the steel plate with flatness of 3-5 m m/m, and the pass rate of the mechanical properties of the steel plate reaches 99.10-99.60%.
【技术实现步骤摘要】
一种特厚板淬火线对厚板进行热处理的方法
本专利技术属于冶金
,具体涉及一种特厚板淬火线对厚板进行热处理的方法。
技术介绍
随着用户对产品质量的要求越来越高,大厚度正加回和调质钢板的需求量不断增大,代表钢种有Cr-Mo钢、锅炉汽包板、齿条钢和Q500以上调质钢系列等,主要应用于制造锅炉压力容器、海洋钻井平台齿条、水电站和工程机械等。这些级别的钢板厚度大,厚度一般大于120mm,强度级别高,抗拉强度一般高于570MPa,淬火能够形成马氏体和贝氏体等硬组织,同时细化晶粒,对于保证这些钢板的力学性能至关重要。世界上普通辊底式淬火炉生产钢板的最大厚度仅为150mm,舞钢第一轧钢厂辊底式淬火炉生产钢板的最大厚度也仅为120mm,厚度超过120mm的特厚钢板需要入水槽冷却,水槽冷却受其冷却速度和水量的限制,冷却效果不好。河钢舞钢新建的300mm特厚钢板淬火线,采用两台单体式炉配备一台特厚钢板淬火机,其中1#炉生产钢板的极限尺寸为300*3500*10000mm,2#炉生产钢板的极限尺寸为300*3500*14000mm,钢板在单体式炉加热到达保温时间后,通过出钢机将钢板运 ...
【技术保护点】
1.一种特厚板淬火线对厚板进行热处理的方法,其特征在于,所述方法包括钢板低压段淬火用水量分配控制、钢板入淬火机头尾温差控制、钢板入淬火机温度控制;所述钢板入淬火机温度控制,通过调整运钢速度至≤0.58m/s,钢板入淬火机温度达到880~930℃。
【技术特征摘要】
1.一种特厚板淬火线对厚板进行热处理的方法,其特征在于,所述方法包括钢板低压段淬火用水量分配控制、钢板入淬火机头尾温差控制、钢板入淬火机温度控制;所述钢板入淬火机温度控制,通过调整运钢速度至≤0.58m/s,钢板入淬火机温度达到880~930℃。2.根据权利要求1所述的一种特厚板淬火线对厚板进行热处理的方法,其特征在于,所述钢板低压段淬火用水量分配控制,当钢板长度L<7m时,低压段使用6组集管进行淬火,瞬时总水量为10043~10558m3/h。3.根据权利要求1所述的一种特厚板淬火线对厚板进行热处理的方法,其特征在于,所述钢板低压段淬火用水量分配控制,当钢板长度为7m≤L≤9m时,低压段使用7组集管进行淬火,瞬时总水量为10751~11262m3/h。4.根据权利要求1所述的一种特厚板淬火线对厚板进行热处理的方法,其特征在于,所述钢板低压段淬火用水量分配控制,当钢板长度L>9m时,低压段使用8组集管进行淬火,瞬时总水量为11445~11966m3/h。5.根据权利要求1-4任意一项所述的一...
【专利技术属性】
技术研发人员:邓建军,李建朝,李杰,于宏伟,宋向前,高明,李劲峰,管秀兵,姚远方,刘彦强,乔蕾,
申请(专利权)人:舞阳钢铁有限责任公司,
类型:发明
国别省市:河南,41
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