CN109604368A - 一种架空导线用超特高强镀锌钢丝及其制造方法 - Google Patents
一种架空导线用超特高强镀锌钢丝及其制造方法 Download PDFInfo
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Abstract
本发明属于架空导线用高强度镀锌钢丝生产工艺领域,涉及一种架空导线用超特高强镀锌钢丝及其制造方法,所述架空导线用1960MPa级超特高强镀锌钢丝选用YL82B高碳钢原料,其化学成分的质量分数为:C:0.80‑0.85%、Si:0.10‑0.30%、Mn:0.60‑0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。镀锌钢丝抗拉强度≥1970MPa,1%伸长应力≥1720MPa;其制造方法,包括如下步骤:步骤1:选取盘条;步骤2:拉拔钢丝;步骤3:热镀锌。
Description
技术领域
本发明属于架空导线用镀锌钢丝生产工艺领域,涉及一种1960MPa级超特高强镀锌钢丝及其制造方法。
背景技术
镀锌钢丝是一种应用广泛的金属制品,可用于大跨度桥梁缆索、海上锚泊缆、远洋捕捞、输电线路支撑结构、制造锚索等多个应用领域,高强度镀锌钢丝的需求量快速增长。
目前随着电力行业的发展,电网跨越输电线路用超特高强镀锌钢丝,是市场急需开发的产品。特别是大跨越输电线路用作加强芯的1960MPa级镀锌钢丝,以其超特高强度、厚锌层、防腐性能强的特点,成为±1000kV超特高压大跨越输电线路用大截面导线领域的需求。但目前1960MPa级镀锌钢丝生产工艺不成熟,生产产品强度低,韧性差,不能满足市场需求。
发明内容
本发明的目的在于克服现有技术的不足之处,提供一种1960MPa级,大跨越输电线路用作加强芯的镀锌钢丝及其制造方法。
本发明解决其技术问题是采取以下技术方案实现的:
一种架空导线用超特高强镀锌钢丝,其特征在于:所述架空导线用1960MPa级超特高强镀锌钢丝选用YL82B高碳钢原料,其化学成分的质量分数为:C:0.80-0.85%、Si:0.10-0.30%、Mn:0.60-0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。镀锌钢丝抗拉强度≥1970MPa,1%伸长应力≥1720MPa。
本发明的另一目的是提供一种架空导线用超特高强镀锌钢丝的制造方法。
一种架空导线用超特高强镀锌钢丝的制造方法,其特征在于:包括如下步骤:步骤1:选取盘条;步骤2:拉拔钢丝;步骤3:热镀锌。
而且,所述步骤1中选取直径为Φ8mm,YL82B高碳钢热轧控冷盘条;盘条化学成分为:C:0.80-0.85%、Si:0.10-0.30%、Mn:0.60-0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。盘条抗拉强度:1250-1320MPa;盘条断面收缩率≥30%。
普通强度架空导线用镀锌钢线原料常用45#、65#钢,用70#钢Φ8mm盘条生产同规格镀锌钢线很难达到1770MPa。
而且,所述步骤2中,光面钢丝Φ2.81mm,由直径8mm的盘条经9道次直进式干式拉拔成型,单道次压缩率最大为22%,总压缩率达到88%;采用单道次较大压缩率的独特拉拔工艺,拉拔速度控制≤3m/s,保证钢丝强度达到≥1970MPa的同时,获得优良的塑性和韧性指标。
拉拔第1道次:直径7.20mm,压缩率19.00%,直径减小量是0.80mm;
拉拔第2道次:直径6.34mm,压缩率22.46%,直径减小量是0.86mm;
拉拔第3道次:直径5.60mm,压缩率21.98%,直径减小量是0.74mm;
拉拔第4道次:直径4.96mm,压缩率21.55%,直径减小量是0.64mm;
拉拔第5道次:直径4.40mm,压缩率21.31%,直径减小量是0.56mm;
拉拔第6道次:直径3.92mm,压缩率20.63%,直径减小量是0.48mm;
拉拔第7道次:直径3.50mm,压缩率20.28%,直径减小量是0.42mm;
拉拔第8道次:直径3.13mm,压缩率20.03%,直径减小量是0.37mm;
拉拔第9道次:直径2.81mm,压缩率19.40%,直径减小量是0.32mm;
光面钢丝的直径控制在±0.01mm。
而且,所述步骤3中,镀锌钢丝的DV值控制在140-150mm·m/min,锌锅温度为460-470℃,抹拭电流为230~250A,氮气流量为400L/min,氮气温度为400℃。
而且,镀锌钢丝成品的抗拉强度≥1970MPa,1%伸长应力≥1720MPa,伸长率≥4.0%,扭转≥20次/360°。
本发明的优点和积极效果是:
1、本发明中,现有普通的架空导线用镀锌钢线原料一般采用45#、65#钢或70#钢,采用70#钢Φ8mm盘条生产同规格镀锌钢线很难达到1770MPa,因此需对各元素的重量比进行调整,选用YL82B高碳钢原料,并采用上述重量比可满足钢丝抗拉强度≥1970MPa的设计要求。
2、本发明中,使用9道次直进式干式拉拔,采用单道次压缩率最大22%,平均压缩率20.75%,总压缩率达到88%,第1道次压缩率19%,第2道次压缩率22.46%,第3道次压缩率21.98%,第4道次压缩率21.55%,第5道次压缩率21.31%,第6道次压缩率20.63%,第7道次压缩率20.28%,第8道次压缩率20.03%,第9道次压缩率19.40%;采用单道次较大压缩率的独特拉拔工艺,拉拔速度控制≤3m/s,保证钢丝强度达到≥1970MPa的同时,获得优良的塑性和韧性指标。
3、本发明中,钢丝镀锌采用电磁抹拭加氮气保护的热镀锌工艺,抹拭电流为230~250A,氮气流量为400L/min,氮气温度为400℃,DV值为140~150mm·m/min,车速为45~55m/min,上锌量不小于240g/m2,可使镀锌钢线的强度和塑性、韧性指标达到目标要求,而且镀锌钢线强度损失会达到最小,保持在5.0-10.0%之间;通过适合的抹拭电流、氮气流量、温度,得到稳定均匀的锌层,锌层质量均值达到265g/m2,满足锌层最小重量的控制要求。
3、本发明中,大跨越输电线路用1960MPa级镀锌钢线,抗拉强度≥1970MPa,1%伸长应力≥1720MPa,锌层厚度≥230g/m2,是用作架空导线用加强芯中的镀锌钢线,用于远距离、大跨越、±1000kV超特高压输电架空导线用19丝、37丝、61丝加强芯,在输电线路中起支撑作用,提供导线的承载力。
具体实施方式
下面通过具体实施例对本发明作进一步详述,以下实施例只是描述性的,不是限定性的,不能以此限定本发明的保护范围。
一种架空导线用超特高强镀锌钢丝,本发明的创新在于,所述架空导线用1960MPa级超特高强镀锌钢丝选用YL82B高碳钢原料,其化学成分的质量分数为:C:0.80-0.85%、Si:0.10-0.30%、Mn:0.60-0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。镀锌钢丝抗拉强度≥1970MPa,1%伸长应力≥1720MPa。
本发明的另一目的是提供一种架空导线用超特高强镀锌钢丝的制造方法。
一种架空导线用超特高强镀锌钢丝的制造方法,其特征在于:包括如下步骤:步骤1:选取盘条;步骤2:拉拔钢丝;步骤3:热镀锌。
本实施例中,所述步骤1中选取直径为Φ8mm,YL82B高碳钢热轧控冷盘条;盘条化学成分为:C:0.80-0.85%、Si:0.10-0.30%、Mn:0.60-0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。盘条抗拉强度:1250-1320MPa;盘条断面收缩率≥30%。
普通强度架空导线用镀锌钢线原料常用45#、65#钢,用70#钢Φ8mm盘条生产同规格镀锌钢线很难达到1770MPa。
本实施例中,所述步骤2中,光面钢丝Φ2.81mm,由直径8mm的盘条经9道次直进式干式拉拔成型,单道次压缩率最大为22%,总压缩率达到88%;采用单道次较大压缩率的独特拉拔工艺,拉拔速度控制≤3m/s,保证钢丝强度达到≥1970MPa的同时,获得优良的塑性和韧性指标。
拉拔第1道次:直径7.20mm,压缩率19.00%,直径减小量是0.80mm;
拉拔第2道次:直径6.34mm,压缩率22.46%,直径减小量是0.86mm;
拉拔第3道次:直径5.60mm,压缩率21.98%,直径减小量是0.74mm;
拉拔第4道次:直径4.96mm,压缩率21.55%,直径减小量是0.64mm;
拉拔第5道次:直径4.40mm,压缩率21.31%,直径减小量是0.56mm;
拉拔第6道次:直径3.92mm,压缩率20.63%,直径减小量是0.48mm;
拉拔第7道次:直径3.50mm,压缩率20.28%,直径减小量是0.42mm;
拉拔第8道次:直径3.13mm,压缩率20.03%,直径减小量是0.37mm;
拉拔第9道次:直径2.81mm,压缩率19.40%,直径减小量是0.32mm;
光面钢丝的直径控制在±0.01mm。
本实施例中,所述步骤3中,镀锌钢丝的DV值控制在140-150mm·m/min,锌锅温度为460-470℃,抹拭电流为230~250A,氮气流量为400L/min,氮气温度为400℃。
而且,镀锌钢丝成品的抗拉强度≥1970MPa,1%伸长应力≥1720MPa,伸长率≥4.0%,扭转≥20次/360°。
Claims (5)
1.一种架空导线用超特高强镀锌钢丝,其特征在于:所述架空导线用1960MPa级超特高强镀锌钢丝其化学成分的质量分数为:C:0.80-0.85%、Si:0.10-0.30%、Mn:0.60-0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。镀锌钢丝抗拉强度≥1970MPa,1%伸长应力≥1720MPa。
2.根据权利要求1所述的一种架空导线用超特高强镀锌钢丝的制造方法,包括如下步骤,步骤1:选取盘条;步骤2:拉拔钢丝;步骤3:热镀锌,其特征在于:
所述步骤1中选取直径为Φ8mm,YL82B高碳钢热轧控冷盘条;盘条化学成分为:C:0.80-0.85%、Si:0.10-0.30%、Mn:0.60-0.90%、S≤0.025%、P≤0.025%、Cr≤0.35%、Ni≤0.10%、V≤0.15%、Cu≤0.20%。盘条抗拉强度:1250-1320MPa;盘条断面收缩率≥30%。
3.根据权利要求2所述的一种架空导线用超特高强镀锌钢丝的制造方法,其特征在于:
所述步骤2中,光面钢丝Φ2.81mm,由直径8mm的盘条经9道次直进式干式拉拔成型,单道次压缩率最大为22%,总压缩率达到88%;采用单道次较大压缩率的独特拉拔工艺,拉拔速度控制≤3m/s,保证钢丝强度达到≥1970MPa的同时,获得优良的塑性和韧性指标。
拉拔第1道次:直径7.20mm,压缩率19.00%,直径减小量是0.80mm;
拉拔第2道次:直径6.34mm,压缩率22.46%,直径减小量是0.86mm;
拉拔第3道次:直径5.60mm,压缩率21.98%,直径减小量是0.74mm;
拉拔第4道次:直径4.96mm,压缩率21.55%,直径减小量是0.64mm;
拉拔第5道次:直径4.40mm,压缩率21.31%,直径减小量是0.56mm;
拉拔第6道次:直径3.92mm,压缩率20.63%,直径减小量是0.48mm;
拉拔第7道次:直径3.50mm,压缩率20.28%,直径减小量是0.42mm;
拉拔第8道次:直径3.13mm,压缩率20.03%,直径减小量是0.37mm;
拉拔第9道次:直径2.81mm,压缩率19.40%,直径减小量是0.32mm;
光面钢丝的直径控制在±0.01mm。
4.根据权利要求2所述的一种架空导线用超特高强镀锌钢丝的制造方法,其特征在于:所述步骤3中,镀锌钢丝的DV值控制在140-150mm·m/min,锌锅温度为460-470℃,抹拭电流为230~250A,氮气流量为400L/min,氮气温度为400℃。
5.根据权利要求2、3、4中任一一项所述的一种架空导线用超特高强镀锌钢丝的制造方法,其特征在于:镀锌钢丝成品的抗拉强度≥1970MPa,1%伸长应力≥1720MPa,伸长率≥4.0%,扭转≥20次/360°。
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