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武钢“一米七”轧制极薄板的W08F钢的镀锡原板,其钢质和力学性能符合国际镀锡板要求水平,但是钢锭轧成坯的成坯率低。本文通过测定钢中的[O]和对生产数据分析,找出影响W08F钢切头废品率的主要因素,提出了减少切头废品率提高成坯率的措施,取得了显著的经济效益。测定钢中[O]_罐量,其结果是对钢坯切头废品率(Y)有明显的影响,即Y随[O]_罐的增加而增加,并得出如下关系式, Y=-5.34+0.0338[O]_罐 [O]_罐在300～410PPm比大于410PPm的试验结果表明,钢坯切头率平均降低3.12％,所以300～410PPm的[O]_罐暂定为控制范围。在罐中未用AL调[O]的条件下,罐中钢水的C、Mn含量影响[O]_罐有如下关系。 [0]_罐=522.5+11.4/[％C]-752.8(％Mn) 因此,将C、Mn含量按成份标准要求上限控制,则使[O]_罐在300～410PPm范围。当然,对于要求有良好深冲性能的低C沸腾钢应采用在罐内加AL调整[O]_罐的方法。 W08F钢由于凝固过程中放气量大,采用人工锹加AL丸封顶钢锭不易被封住顶,而采用Ar气喷AL丸封顶新方法,使封顶层加厚,从而提高了封顶效果和改善钢锭头部结构。从试验对比结果来看,切头废品率降低了4.38％,并对钢质无不利影响。关于W08F钢坯头部的剪口断面上常出现“舌状”缺陷,从而增加切头废品率,甚至使钢锭长度不足4000毫米定尺长度要求,通过检验分析,认为该种缺陷主要是因S的偏析富集,当在剪切温度下由于受剪切应力而产生热脆所形成的。因此,将钢中S含量降低到≯0.015％,可消除或减轻“舌状”缺陷。对带“舌状”断面的钢坯也进行了轧制,初步结果说明,能生产出符合交货条件的镀锡板。因此,对W08F钢生产在正常工艺条件下,通过控制罐中的C、Mn量或用AL调整罐中[O],使[O]_罐在300～410PPm范围内;采用Ar气喷AL丸封顶;降低钢中S含量,减少S的偏析度;将使切头废品率减少,提高成坯率。
WISCO’s “one meter seven” rolled W08F steel tin plate, its steel and mechanical properties in line with the requirements of the international tin plate, but the ingot into the blank into the billet into the billet rate is low. In this paper, through the determination of [O] in steel and analysis of production data to find out the main factors that affect the scrap rate of W08F steel cut, the measures to reduce the rate of cut waste to improve the blank-forming rate are proposed and significant economic benefits have been achieved. Determining [O] _ tank capacity in steel has a significant effect on the scrap yield (Y) of the billet, ie Y increases with increasing [O] _ tank and gives the following relation, Y = - The test results of 5.34 + 0.0338 [O] _ can [O] _ tank at 300 ~ 410PPm greater than 410PPm showed that the billet cutting rate decreased by 3.12% on average, so the 300 ~ 410PPm [O] _ tank was tentatively controlled. In the tank without AL tone [O] conditions, the tank of molten steel C, Mn content [O] _ tank has the following relationship. [0] _ pot = 522.5 +11.4 / [% C] -752.8 (% Mn) Therefore, the C, Mn content requirements of the ingredients according to the upper limit of control, then [O] _ tank 300 ~ 410PPm range. Of course, for low C boiling steels that require good deep-drawing properties, a method of adding AL into the tank should be used. W08F steel deflation due to the solidification process, the use of artificial spade plus AL pills capping steel ingot is not easy to seal the top, and the use of Ar gas spray AL pill cap new way to seal the top layer thickened, thereby enhancing the capping effect and improve the ingot Ministry structure. Judging from the experimental results, the rate of cut waste was reduced by 4.38% and no adverse effect on the steel quality was obtained. On the head of the W08F billet cutting section often appear “tongue” defects, thereby increasing the rate of crop failure, and even the ingot length of less than 4,000 mm length requirements of length, by inspection and analysis, that such defects mainly due to S Segregation enrichment, formed at shear temperature due to thermal brittleness due to shear stress. Therefore, reducing the S content of steel to ≯0.015% can eliminate or alleviate “tongue-like” defects. Billets with “tongue-like” cross-sections were also rolled, with preliminary results showing that tinplates were produced that met the delivery conditions. Therefore, the production of W08F steel under normal process conditions, by controlling the amount of C, Mn in the tank or adjust the tank [O] with AL, so that [O] _ tank in the range of 300 ~ 410PPm; Cap; reduce the S content of steel to reduce the segregation of S; will reduce the rate of cut crop, improve the billet rate.