CN110918970A - 一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料 - Google Patents
一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料 Download PDFInfo
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Abstract
本发明公开了一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,属于钢铁冶金行业连铸用功能耐火材料领域。其特征在于水口内衬材料不含氧化铝类颗粒,具体配料组成为氧化镁55‑60%,石英砂25‑30%,石墨5‑10%,外加5‑10%的酚醛树脂作为结合剂。氧化镁的粒度0.1mm‑1.0mm,石英砂的粒度0.5‑2.0mm,内衬厚度5‑8mm。本发明内衬材料能够显著减少硅脱氧钢中的高氧化铝夹杂,超深拉拔类线材的断丝率。
Description
技术领域
本发明属于耐火材料领域,涉及一种连铸用浸入式水口内衬材料。
背景技术
常见的硅脱氧钢包括胎圈钢丝、钢帘线、切割钢丝及金刚线等超深拉拔类线材。由于材料的后续加工过程(包括多道次拉拔和捻制)严苛,钢中一旦存在大尺寸不变形高氧化铝夹杂,钢丝在拉拔或者合股过程中就会发生断线,严重影响钢丝的生产效率甚至导致钢丝报废。
目前浸入式水口的内衬常用骨料包括氧化铝、镁铝尖晶石、莫来石等含铝氧化物,基质一般为石墨。由于硅脱氧钢脱氧不彻底,在连铸过程钢中仍存在一定的溶解氧,此部分溶解氧将与耐材中的石墨发生氧化反应造成浸入式水口内壁脱碳,水口内壁脱碳后,基体中的氧化物骨料颗粒将暴露于钢水中,在钢水的冲刷作用下,耐材骨料颗粒极易进入钢水。因此,浸入式水口内衬的熔损、剥落是硅脱氧钢中大尺寸不变形高氧化铝夹杂的重要来源之一,亦是造成材料加工过程断丝的原因之一。专利CN20191023723公开了一种低杨氏模量化的浸入式水口内衬材料,通过对耐材杨氏模量的控制来解决拉拔断丝的问题,该方法虽效果显著,但是对原料的要求严格。而本发明与该方案相比,无需控制耐材原料的杨氏模量,提出一种新的控制原理和新的控制方法,并且从断丝率效果上看,本发明能取得更好的效果的。
发明内容
针对浸入式水口耐火材料熔损、剥落引入的大尺寸不变形高氧化铝夹杂问题,本发明的目的是提出一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,由于此内衬材料成分经特殊设计,在高温条件下与钢水发生反应,生成一层不含氧化铝的镁硅橄榄石,即便其剥落至钢液,在拉拔过程亦会充分破碎,不会造成材料拉拔和合股过程的断丝。
为实现上述目的,本发明采用的技术方案是:一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料。按重量百分比计,其特征在于:
配料组成为氧化镁55-60%,石英砂25-30%,石墨5-10%,外加5-10%的酚醛树脂作为结合剂。氧化镁的粒度0.1mm-1.0mm,石英砂的粒度0.5-2.0mm,内衬厚度5-8mm。
加入石英砂的目的和作用有两个方面,首先提高产品的抗热震性,其次是促进高温线镁硅橄榄石的生成。石墨的加入是为了提高材料的抗侵蚀性,不加石墨会大大降低材料的使用寿命。
本发明中加入55-60%氧化镁,和石英砂在高温下与钢水反应,形成镁硅橄榄石,在本发明中且无需控制氧化镁密度。
本发明提出的成分和含量是综合考虑材料的抗热震性和硅脱氧条件下镁硅橄榄石的生成条件设计出来的,此成分范围的材料性能已经得到了验证,均能达到预期效果。
与现有技术相比,本发明的有益效果为:
本发明提出的一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,将氧化镁与石英砂按一定比例配比,一方面能够保证材料使用过程具有良好的抗热震性,另一方面本发明所设计的内衬材料高温下与钢水反应,生成一种无铝的镁硅橄榄石,大幅度降低钢中高氧化铝类夹杂。另外,即便此类无铝镁硅橄榄石剥落进入钢液,亦能充分破碎,不会造成硅脱氧钢拉拔和捻制过程的断丝。
附图说明
图1为本发明浸入式水口内衬示意图;
图2为使用后的本发明内衬的显微结构和成分;
图3为使用后的对比例1内衬的显微结构和成分。
具体实施方式
下面结合附图及具体实施例对本发明作进一步的详细说明。
如图1所示,一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,配料组成为氧化镁55-60%,石英砂25-30%,石墨5-10%,外加5-10%的酚醛树脂作为结合剂。氧化镁的粒度0.1mm-1.0mm,石英砂的粒度0.5-2.0mm,内衬厚度5-8mm。
实施例1
一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,由按以下重量百分比的原料混合而成,氧化镁55%,石英砂30%,石墨5%,外加10%的酚醛树脂作为结合剂。氧化镁的粒度0.1mm-1.0mm,石英砂的粒度0.5-2.0mm,内衬厚度8mm。
实施例2
一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,由按以下重量百分比的原料混合而成,氧化镁60%,石英砂25%,石墨10%,外加5%的酚醛树脂作为结合剂。氧化镁的粒度0.1mm-1.0mm,石英砂的粒度0.5-2.0mm,内衬厚度5mm。
实施例3
一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,由按以下重量百分比的原料混合而成,氧化镁58%,石英砂28%,石墨8%,外加6%的酚醛树脂作为结合剂。氧化镁的粒度0.1mm-1.0mm,石英砂的粒度0.5-2.0mm,内衬厚度6mm。
对比例1
对比例1使用的是目前钢铁企业普遍使用的铝碳质浸入式水口(市售)。
为检验本发明效果,将上述内衬材质分别与本体材质复合制备浸入式水口,其中本体材料原料重量百分比为:刚玉55%,熔融石英15%,石墨20%,外加酚醛树脂8%作为结合剂,内衬材料涂覆在本体材料后,将本体材料和内衬材料在60℃干燥,控制挥发分在1%,将本体材料和内衬材料在150MPa压力下等静压成型,内衬厚度为5-8mm,并在1000℃温度下热处理,惰性气氛中,保温6h,得到浸入式水口。
试验例1
将实施例1、实施例2、实施例3和对比例1所述的浸入式水口用于帘线82A的生产,使用扫描电镜分析使用后的浸入式水口。
附图2为使用后的本发明内衬的显微结构和成分,可以看出,本发明的内衬为Mg-Si-O系橄榄石,Al含量极低;
附图3为使用后的对比例内衬的显微结构和成分,可以看出,目前普通铝碳质水口在使用过程氧化铝颗粒与钢水直接接触,存在剥落的可能性。
生产的帘线82A铸坯热轧成规格为的热轧盘条,热轧盘条经多道次拉拔成钢丝(直径0.235mm),统计盘条湿拉过程的断丝率,如表1所示,实施例1、实施例2、实施例3所得盘条的吨钢断丝率分别为0.15次/吨钢、0.23次/吨钢和0.12次/吨钢,明显低于对比例1的1.63次/吨钢。
表1不同材料的水口内衬生产帘线钢盘条的断丝率
项目 | 吨钢断丝次数,次/吨钢 |
实施例1 | 0.15 |
实施例2 | 0.23 |
实施例3 | 0.12 |
对比例1 | 1.63 |
通过以上试验例1说明,使用本发明所提出的“一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料”与钢液接触部分不含氧化铝类夹杂,可大幅度减少由浸入式水口内衬剥落带入的高铝夹杂,本发明可以显著降低由浸入式水口内衬耐火材料熔损、剥落引起的断丝。
以上实施例仅用以说明而非限制本发明的技术方案,尽管参照上述实施例对本发明进行了详细说明,本领域的普通技术人员应当理解:依然可以对本发明进行修改或者等同替换,而不脱离本发明的精神和范围的任何修改或局部替换,其均应涵盖在本发明的权利要求范围当中。
Claims (3)
1.一种降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,其特征在于:所述水口内衬材料不含氧化铝类颗粒。
2.如权利要求1所述的降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,其特征在于:所述水口内衬材料按重量百分比计,配料组成为氧化镁55-60%,石英砂25-30%,石墨5-10%,5-10%的酚醛树脂结合剂。
3.如权利要求2所述的降低硅脱氧钢加工过程断丝率的浸入式水口内衬材料,其特征在于:氧化镁的粒度0.1mm-1.0mm,石英砂的粒度0.5-2.0mm。内衬厚度为5-8mm。
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