CN100462445C - 低铝含镁复合脱氧剂 - Google Patents

低铝含镁复合脱氧剂 Download PDF

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CN100462445C
CN100462445C CNB2006100814128A CN200610081412A CN100462445C CN 100462445 C CN100462445 C CN 100462445C CN B2006100814128 A CNB2006100814128 A CN B2006100814128A CN 200610081412 A CN200610081412 A CN 200610081412A CN 100462445 C CN100462445 C CN 100462445C
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steel
calcium
lard
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CN1851002A (zh
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陈丽萍
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BEIJING CENTURY JINHONG TECHNOLOGY Co Ltd
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Abstract

本发明公开了一种低铝含镁复合脱氧剂，其化学成分重量百分比为：Si：50～60%，Ba：10～20%，Ca：12～18%，Mg：1～1.5%，余量为Fe及不可避免的杂质。本发明提高了Ca的含量，可使脱氧产物形成含钙硅酸盐，熔点和比重降低，容易上浮进入渣中，从而减少钢中夹杂物含量。同时，钙还具有改善钢中氧化物和硫化物夹杂形态，提高钢中夹杂物球化率的作用，对提高钢的综合机械性能，尤其是提高钢的冲击韧性和延伸率十分有利。由于钙与氧和硫的亲和力都很强，加入钙后还会提高脱氧剂的脱氧和脱硫效果。本发明由于减少了Mg的含量，不仅降低了生产成本，而且可以形成铝镁复合夹杂物，铝镁硅钙复合夹杂物，起到夹杂变性作用，从而提高钢的韧性和冲击性。

Description

低铝含镁复合脱氧剂
技术领域
本发明涉及一种低铝含镁复合脱氧剂----硅钡钙镁合金，用在钢铁高端产品如重轨、高速轨等无铝炼钢过程中，无铝脱氧钢的终脱氧剂和精炼过程中的扩散脱氧剂使用，也可以作为铝脱氧钢的综合脱氧方式的脱氧合金使用。
背景技术
目前，钢铁高端产品中重轨和高速轨需要无铝脱氧剂，且要求脱氧效果达到20PPM以内。而以前的产品如中国专利CN03111436.9公开了一种不含铝的炼钢脱氧用硅钙钡镁铁合金。它由重量比为40～50％的Si、10～25％的Ba、6～10％的钙、2～8％的Mg、余量为Fe组成。该复合脱氧剂虽然无铝，但钙含量低，达不到高端钢铁品种如重轨和高速轨的脱氧要求，且贵重金属镁含量高，回收率反而低，造成原材料的浪费和成本的提高，而且使冶炼炉产生大量的污染烟。
发明内容
针对上述存在的问题，本发明的目的在于提供一种低铝含镁复合脱氧剂，用该合金脱氧能大大增加钢的纯净度，减少钢中夹杂物含量，改善夹杂物形态，提高钢的韧性。
为实现上述目的，本发明一种低铝含镁复合脱氧剂其化学成分重量百分比为：Si：50～60％，Ba：10～20％，Ca：12～18％，Mg：1～1.5％，余量为Fe及不可避免的杂质。
一种加工上述低铝含镁复合脱氧剂的方法，具体为：①以石灰石、兰炭、重晶石、烟煤、硅石、铁屑为原料，利用矿热炉采用碳热法生产工艺加工出硅钙钡合金；②向硅钙钡合金中热兑金属镁锭。
本发明提高了Ca的含量，可使脱氧产物形成含钙硅酸盐，熔点和比重降低，容易上浮进入渣中，从而减少钢中夹杂物含量。同时，钙还具有改善钢中氧化物和硫化物夹杂形态，提高钢中夹杂物球化率的作用，对提高钢的综合机械性能，尤其是提高钢的冲击韧性和延伸率十分有利。由于钙与氧和硫的亲和力都很强，加入钙后还会提高脱氧剂的脱氧和脱硫效果。此外，本发明由于减少了Mg的含量，不仅降低了生产成本，而且可以形成铝镁复合夹杂物，铝镁硅钙复合夹杂物，起到夹杂变性作用，从而提高钢的韧性和冲击性。
附图说明
图1为本发明工艺流程图。
具体实施方式
实施例1：Si：50％，Ca：11％，Mg：1％，Ba：14％，余量为Fe及不可避免的杂质的合金。
以石灰石410Kg、兰炭984Kg、重晶石492Kg、烟煤492Kg、硅石1640Kg、铁屑164Kg(吨合金消耗量)为主要原料，利用矿热炉采用碳热法生产工艺加工出硅钙钡合金，热兑金属镁锭11.5kg生产。
实施例2：Si：55％，Ca：18％，Mg：2％，Ba：16％，余量为Fe及不可避免的杂质的合金。
以石灰石600Kg、兰炭1056Kg、重晶石528Kg、烟煤528Kg、硅石1810Kg、铁屑176Kg(吨合金消耗量)为主要原料，利用矿热炉采用碳热法生产工艺加工出硅钙钡合金，热兑金属镁锭23kg生产。
实施例3：Si：50％，Ca：14％，Mg：1.5％，Ba：17％，余量为Fe及不可避免的杂质的合金。
以石灰石500Kg、兰炭1025Kg、重晶石560Kg、烟煤528Kg、硅石1640Kg、铁屑176Kg(吨合金消耗量)为主要原料，利用矿热炉采用碳热法生产工艺加工出硅钙钡合金，热兑金属镁锭17.5kg生产。
上述三个实施例的具体工艺流程如图1。
本发明低铝含镁复合脱氧剂试验数据如下：
表1成品钢中全氧含量(ppm)
 
钢种 脱氧剂种类 T[O]
U71Mn Si-Ca-Ba 15.4
U71Mn Si-Ca-Ba-Mg 14.6
U71Mn Si-Ca-Ba-Mg 10
U71Mn Si-Ca-Ba-Mg 8.5
平均 11
表2成品轨力学性能
Figure C200610081412D00051
表3成品轨金相组织与夹杂物评级
Figure C200610081412D00052
从上述实验数据可以看出，使用本发明低铝含镁复合脱氧剂的成品钢中的全氧含量达到了11ppm，低于使用对比脱氧剂生产的成品钢的全氧含量；成品钢的力学性能均满足标准要求；成品钢的夹杂物评级达到了相应标准要求。

Claims (2)

1.一种低铝含镁复合脱氧剂，其特征在于，其化学成分重量百分比为：Si：50～60％，Ba：10～20％，Ca：12～18％，Mg：1～1.5％，余量为Fe及不可避免的杂质。
2.一种加工权利要求1所述低铝含镁复合脱氧剂的方法，具体为：首先，以石灰石、兰炭、重晶石、烟煤、硅石、铁屑为主要原料，利用矿热炉采用碳热法生产工艺加工出硅钙钡合金，然后，热兑金属镁锭生产出低铝含镁复合脱氧剂成品。
CNB2006100814128A 2006-05-18 2006-05-18 低铝含镁复合脱氧剂 Expired - Fee Related CN100462445C (zh)

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CN102409139A (zh) * 2011-11-26 2012-04-11 内蒙古包钢钢联股份有限公司 一种炼钢精炼脱氧工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1299881A (zh) * 2000-12-28 2001-06-20 赵玉典 硅钡钙铁合金复合脱氧剂及其制备方法
CN1442493A (zh) * 2003-04-14 2003-09-17 郭庆成 用于炼钢脱氧的硅钡钙镁铁合金
CN1456691A (zh) * 2003-05-26 2003-11-19 本溪冶炼厂 用于炼钢脱氧剂的硅钡锶钙镁铁合金
CN1150340C (zh) * 2001-04-26 2004-05-19 刘长福 硅钙钡镁复合脱氧剂的生产工艺
CN1548559A (zh) * 2003-05-14 2004-11-24 洛阳忠诚电力集团有限公司 硅钡钙硼镁铁合金及其制备方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1299881A (zh) * 2000-12-28 2001-06-20 赵玉典 硅钡钙铁合金复合脱氧剂及其制备方法
CN1150340C (zh) * 2001-04-26 2004-05-19 刘长福 硅钙钡镁复合脱氧剂的生产工艺
CN1442493A (zh) * 2003-04-14 2003-09-17 郭庆成 用于炼钢脱氧的硅钡钙镁铁合金
CN1548559A (zh) * 2003-05-14 2004-11-24 洛阳忠诚电力集团有限公司 硅钡钙硼镁铁合金及其制备方法
CN1456691A (zh) * 2003-05-26 2003-11-19 本溪冶炼厂 用于炼钢脱氧剂的硅钡锶钙镁铁合金

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