CN114941105A - 一种抗震螺纹钢hrb500e及其生产方法 - Google Patents
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Abstract
一种抗震螺纹钢HRB500E及其生产方法,钢的化学成分重量百分比为:C=0.22~0.25,Si=0.50~0.70,Mn=1.45~1.55,P≤0.030,S≤0.030,V=0.06~0.08,Nb=0.010~0.030,N≤0.012,Ceq=0.48~0.53,余量为Fe和不可避免的杂质。根据HRB500E抗震螺纹钢的国家标准要求以及析出强化元素对材料性能的影响,结合棒材轧钢厂现有的装备条件和过程工艺控制水平,开发出了屈服强度为500MPa以上,规格为Ф12~Ф40mm的HRB500E热轧直条螺纹钢。
Description
技术领域
本发明属于冶金技术领域,涉及一种抗震螺纹钢HRB500E及其生产方法。
背景技术
中国自建立联合推进高强度钢筋应用机制以来,500MPa级别的高强钢筋HRB500得到较广泛应用;为应对地震等自然灾害,高强抗震螺纹钢HRB500E需求也不断增加。抗震螺纹钢HRB500E为提高其抗震性能,在原有HRB500性能指标的基础上增加了强屈比、最大力总延伸率、反向弯曲等要求。抗震螺纹钢的强屈比要求不小于1.25,强度越高的抗震螺纹钢越难达到这项指标要求,提高了钢筋的抗破坏能力,使钢筋具有良好的冷变形能力和高的塑性变形功,强屈比越大,吸收的能量越多,越不容易被破坏。在实际建筑结构中,最受关注的是钢筋的整体变形能力,也就是最大力总延伸率。稳定的屈服强度有利于钢筋受力均匀,当受力超过屈服强度时,钢筋发生相对均匀的变形,避免在地震过程中出现破坏性变形。
发明内容
本发明旨在提供一种抗震螺纹钢HRB500E及其生产方法,生产出屈服强度为500MPa以上,规格为Ф12~Ф40mm的HRB500E热轧直条螺纹钢。
本发明的技术方案:
一种抗震螺纹钢HRB500E及其生产方法,钢的化学成分重量百分比为:C=0.22~0.25,Si=0.50~0.70,Mn=1.45~1.55,P≤0.030,S≤0.030,V=0.06~0.08,Nb=0.010~0.030,N≤0.012,Ceq=0.48~0.53,余量为Fe和不可避免的杂质;包括以下工艺步骤:
(1)转炉吹炼:转炉按铁耗780~810kg/t进行装入;转炉吹炼过程加入石灰25~30kg/t、轻烧白云石12~14kg/t、石墨球5~8kg/t、硅铁2~4kg/t,转炉终点P=0.010%~0.015%、碳氧积[C]×[O]≤0.0025,终点温度≥1580℃。
(2)转炉出钢:转炉出钢采用硅钙钡复合脱氧剂+硅锰对钢水进行脱氧,出钢过程加入石灰2~3kg/t、萤石1~1.5kg/t,同时按钢的化学成分重量百分比下限加入增碳剂+锰硅合金+钒氮合金+钒铁+铌铁对钢水进行成分调整。
(3)LF精炼:钢包进入LF精炼炉后对钢水进行升温、脱氧、造白渣操作,精炼造渣过程加石灰3~5kg/t、高铝预熔渣1~2kg/t、脱氧剂0.5~1kg/t,成渣后对钢液进行深脱硫操作,然后根据成分结果对钢水进行合金微调,软吹后上连铸浇注;钢水在LF精炼炉总精炼时间45~60min。
(4)连铸:中包采用保温剂保温,在保温剂上加一层碳化稻壳,中包过热度15~30℃,拉速2.4~2.6m/min,二冷比水量1.3~1.6L/kg,铸坯采用热送热装,热送热装温度为≥300℃。
(5)加热与轧制:铸坯在加热炉总加热时间60~90min,加热段温度1050~1140℃,均热段温度1100~1150℃,开轧温度为1000~1050℃,进精轧温度980~1020℃,上冷床温度890~950℃;铸坯出炉后开启高压水除鳞,除鳞水压在16MPa以上。
本发明的有益效果:根据抗震螺纹钢HRB500E的性能和使用要求,结合现有的装备条件和工艺技术控制水平,根据合金元素对材料性能的影响,设计出抗震螺纹钢HRB500E合适的化学成分,通过转炉、精炼、连铸及轧制等过程工艺控制,得到满足标准要求且性能稳定的抗震螺纹钢HRB500E。
附图说明
图1为抗震螺纹钢HRB500E金相组织图(500×)。
图2为Ф40mm规格直条HRB500E金相组织图(100×)。
图3为Ф12mm规格直条HRB500E金相组织图(100×)。
具体实施方式
下面结合实施例进一步说明。
实施例1:抗震螺纹钢HRB500E的生产
钢的化学组成百分含量如表1 。转炉入炉铁水中[S]=0.041%,P=0.136%,Si=0.42%,温度1334℃,不进行预处理。关键工艺步骤包括:
(1)转炉吹炼:转炉按铁耗785kg/t进行装入;转炉吹炼过程加入石灰26.5kg/t,轻烧白云石12.4kg/t,加入石墨球7.6kg/t,硅铁3.5kg/t,转炉终点磷含量P:0.0147%,终点碳氧积[C] ×[O]=0.00237,终点温度1591℃。
(2)转炉出钢:转炉出钢采用硅钙钡复合脱氧剂+硅锰对钢水进行脱氧,出钢过程加入石灰2.3kg/t、萤石1.5kg/t,同时按成分中下限要求加入增碳剂+锰硅合金+钒氮合金+钒铁+铌铁对钢水进行成分调整。
(3)LF精炼:钢包进入LF精炼炉后,先对钢水进行升温、脱氧、造白渣等操作,精炼造渣过程加石灰4.5kg/t、高铝预熔渣1.3kg/t、脱氧剂0.9kg/t,成渣后对钢液进行深脱硫操作,然后根据成分结果对钢水进行合金微调,软吹后上连铸浇注。钢水在LF精炼炉总精炼时间57min。
(4)连铸:连铸上3#小方坯连铸机,中包采用保温剂保温,在保温剂上加一层碳化稻壳,中包过热度28℃,拉速2.4m/min,二冷比水量1.5L/kg,铸坯采用热送热装,热送热装温度为613℃。
(5)加热与轧制:铸坯在加热炉总加热时间68min,加热段温度1088℃,均热段温度1117℃,开轧温度为1013℃,进精轧温度为993℃,上冷床温度904℃;铸坯出炉后开启高压水除鳞,除鳞水压在18MPa。
实施例2:抗震螺纹钢HRB500E的生产
钢的化学组成百分含量如表1 。转炉入炉铁水中S=0.047%,P=0.127%,Si=0.45%,温度1317℃,不进行预处理。关键工艺步骤包括:
(1)转炉吹炼:转炉按铁耗805kg/t进行装入;转炉吹炼过程加入石灰29kg/t、轻烧白云石13.5kg/t、石墨球5.6kg/t、硅铁2.2kg/t,转炉终点磷含量P为0.0113%,终点碳氧积[C] ×[O]=0.00208,终点温度为1624℃。
(2)转炉出钢:转炉出钢采用硅钙钡复合脱氧剂+硅锰对钢水进行脱氧,出钢过程加入石灰3kg/t、萤石1kg/t,同时按成分中下限要求加入增碳剂+锰硅合金+钒氮合金+钒铁+铌铁对钢水进行成分调整。
(3)LF精炼:钢包进入LF精炼炉后,先对钢水进行升温、脱氧、造白渣等操作,精炼造渣过程加石灰3.6kg/t、高铝预熔渣2kg/t、脱氧剂0.6kg/t,成渣后对钢液进行深脱硫操作,然后根据成分结果对钢水进行合金微调,软吹后上连铸浇注。钢水在LF精炼炉总精炼时间49min。
(4)连铸:连铸上3#小方坯连铸机,中包采用保温剂保温,在保温剂上加一层碳化稻壳,中包过热度20℃,拉速2.6m/min,二冷比水量1.3L/kg,铸坯采用热送热装,热送热装温度为532℃。
(5)加热与轧制:铸坯在加热炉总加热时间85min,加热段温度1134℃,均热段温度1142℃,开轧温度为1046℃,进精轧温度为1013℃,上冷床温度941℃;铸坯出炉后开启高压水除鳞,除鳞水压在22MPa。
表1 实施例钢的化学成分(%)
表2 实施例轧制圆钢性能检测结果
Claims (1)
1.一种抗震螺纹钢HRB500E的生产方法,其特征在于:钢的化学成分重量百分比为C=0.22~0.25,Si=0.50~0.70,Mn=1.45~1.55,P≤0.030,S≤0.030,V=0.06~0.08,Nb=0.010~0.030,N≤0.012,Ceq=0.48~0.53,余量为Fe和不可避免的杂质;包括以下工艺步骤:
(1)转炉吹炼:转炉按铁耗780~810kg/t进行装入;转炉吹炼过程加入石灰25~30kg/t、轻烧白云石12~14kg/t、石墨球5~8kg/t、硅铁2~4kg/t,转炉终点P=0.010%~0.015%、碳氧积[C]*[O]≤0.0025,终点温度≥1580℃;
(2)转炉出钢:转炉出钢采用硅钙钡复合脱氧剂+硅锰对钢水进行脱氧,出钢过程加入石灰2~3kg/t、萤石1~1.5kg/t,同时按钢的化学成分重量百分比下限加入增碳剂+锰硅合金+钒氮合金+钒铁+铌铁对钢水进行成分调整;
(3)LF精炼:钢包进入LF精炼炉后对钢水进行升温、脱氧、造白渣操作,精炼造渣过程加石灰3~5kg/t、高铝预熔渣1~2kg/t、脱氧剂0.5~1kg/t,成渣后对钢液进行深脱硫操作,然后根据成分结果对钢水进行合金微调,软吹后上连铸浇注;钢水在LF精炼炉总精炼时间45~60min;
(4)连铸:中包采用保温剂保温,在保温剂上加一层碳化稻壳,中包过热度15~30℃,拉速2.4~2.6m/min,二冷比水量1.3~1.6L/kg,铸坯采用热送热装,热送热装温度为≥300℃;
(5)加热与轧制:铸坯在加热炉总加热时间60~90min,加热段温度1050~1140℃,均热段温度1100~1150℃,开轧温度为1000~1050℃,进精轧温度980~1020℃,上冷床温度890~950℃;铸坯出炉后开启高压水除鳞,除鳞水压在16MPa以上。
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