CN112195406A - 低成本高性能Q370qE-HPS桥梁钢及生产方法 - Google Patents
低成本高性能Q370qE-HPS桥梁钢及生产方法 Download PDFInfo
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Abstract
本发明公开了一种低成本高性能Q370qE‑HPS桥梁钢,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.40%,Mn:1.61%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.030%~0.050%,Ti:0.010%~0.018%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.05%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。采用TMCP轧制工艺,得到屈强比低焊接性能优异的满足标准要求的桥梁钢板,提高了企业的市场竞争力。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种低成本高性能Q370qE-HPS桥梁钢及生产方法。
背景技术
高性能桥梁钢板Q370qE-HPS广泛用于公路桥、铁路桥、公铁两用桥,自从2010年后,在国家大力发展交通建设,桥梁用钢不断增加的背景下,大跨度的Q370级别桥梁用钢主要采用的正火钢板,正火热处理工艺冶炼工序成本在200元以上,还不包括转运的成本,钢板在正火后会出现性能不稳定、焊接接头冲击功偏低、分层等现象,或熔透角焊接层状撕裂等质量问题。
发明内容
为了解决以上技术问题,本发明提供一种低成本高性能Q370qE-HPS桥梁钢,其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.40%,Mn:1.61%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.030%~0.050%,Ti:0.010%~0.018%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.05%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
技术效果:本发明在精心研究国家桥梁结构钢GB/T 714标准后,通过独特的低碳微铌钛合金化桥梁成分设计,得到铁素体更多的组织结构,促进了产品软向组织的形成,有效提高二开及终轧温度,适当改判组织的晶粒度,稳定产品屈服强度,通过水冷的条件,促进了碳化物及铬元素的组织转变,降低屈服强度的同时提升产品的抗拉强度,有效降低了产品的屈强比。
本发明进一步限定的技术方案是:
前所述的低成本高性能Q370qE-HPS桥梁钢,板厚16~30mm,其化学成分及质量百分比如下:C:0.05%~0.07%,Si:0.10%~0.20%,Mn:1.61%~1.65%,P≤0.015%,S≤0.0030%,Nb:0.030%~0.040%,Ti:0.010%~0.015%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.05%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
前所述的低成本高性能Q370qE-HPS桥梁钢,板厚30~50mm,其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.15%~0.25%,Mn:1.63%~1.68%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.050%,Ti:0.010%~0.015%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.0005%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
前所述的低成本高性能Q370qE-HPS桥梁钢,板厚50~60mm,其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.20%~0.40%,Mn:1.65%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.050%,Ti:0.010%~0.015%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.0005%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
前所述的低成本高性能Q370qE-HPS桥梁钢,钢板显微组织包括铁素体、珠光体和10%~30%贝氏体。
本发明的另一目的在于提供一种低成本高性能Q370qE-HPS桥梁钢的生产方法,无需回火处理,包括按成分设计体系配比备料→铁水预处理→顶底复吹转炉冶炼→LF炉精炼→RH真空处理→板坯浇注→步进炉加热→高压水除鳞→控制轧制冷却→轧后处理,控制轧制冷却工艺:奥氏体温度1100~1110℃,待温坯厚度根据钢板厚度调整2~4倍,二开温度根据订单厚度调整820~990℃,终轧温度为820±20℃,采用超快冷冷却至560~590℃,钢板冷却后及时下线进缓冷坑进行堆冷,堆冷24小时后进行剪切、标识、表检、探伤、入库。
本发明的有益效果是:
(1)本发明依据中国国家标准GB/T 714结构用桥梁钢,采用了高锰铬元素、低碳微铌钛合金化成分设计,采用了TMCP轧制技术替代了传统的TMCP+回火工艺,有效降低了产品制造成本,大幅度了提高了企业竞争力;
(2)本发明采用的低温奥氏体化技术,降低了原始奥氏体晶粒度,保证了产品低温冲击韧性的稳定;
(3)本发明通过控制二开温度及终轧温度,配合水冷工艺,有效降低了产品屈服强度保证了抗拉强度的稳定,稳定了产品屈强比的稳定;
(4)本发明通过轧制温度的控制及轧后水冷方法,合理进行了组织转变,获得包括铁素体、珠光体和10%~30%贝氏体的组织,减轻了带状组织的危害,避免心部有害元素及硬相组织的聚集,提高产品的探伤合格率及焊接性能的稳定性;
(5)本发明通过高锰铬元素的设计,细化了组织晶粒度,保证了产品抗拉强度的稳定,通过控制二开温度及终轧温度,保证了产的屈强比;
(6)本发明通过钢板堆冷,有效解决了产品内应力不均匀的问题,保证了客户分切、加工稳定性。
附图说明
图1为实施例1得到的钢板在金相显微镜下典型的组织形貌图。
具体实施方式
以下实施例提供的一种低成本高性能Q370qE-HPS桥梁钢,钢板厚度规格分别为22mm、33mm、55mm,其化学成分及质量百分比如表1所示,
表1实施例钢板化学成分(wt%)
元素 | C | Si | Mn | P | S | Nb | Ti |
实施例1 | 0.06 | 0.15 | 1.63 | 0.013 | 0.002 | 0.031 | 0.013 |
元素 | Ni | Cr | Mo | Cu | B | N | Al |
实施例1 | 0.03 | 0.23 | 0.009 | 0.02 | 0.0002 | 0.0035 | 0.031 |
元素 | C | Si | Mn | P | S | Nb | Ti |
实施例2 | 0.07 | 0.20 | 1.65 | 0.011 | 0.001 | 0.045 | 0.012 |
元素 | Ni | Cr | Mo | Cu | B | N | Al |
实施例2 | 0.02 | 0.26 | 0.008 | 0.03 | 0.0003 | 0.0038 | 0.028 |
元素 | C | Si | Mn | P | S | Nb | Ti |
实施例3 | 0.075 | 0.36 | 1.69 | 0.010 | 0.001 | 0.048 | 0.015 |
元素 | Ni | Cr | Mo | Cu | B | N | Al |
实施例3 | 0.04 | 0.28 | 0.010 | 0.01 | 0.0002 | 0.0042 | 0.033 |
。
生产方法包括以下步骤:按上述成分设计体系配比备料→铁水预处理→顶底复吹转炉冶炼→LF炉精炼→RH真空处理→板坯浇注→步进炉加热→高压水除鳞→控制轧制冷却→轧后处理,奥氏体温度1100~1110℃,待温坯厚度根据钢板厚度调整2~4倍,二开温度根据订单厚度调整820~990℃,终轧温度为820±20℃,采用超快冷冷却至560~590℃。具体轧制工艺见表2,性能见表3,表2实施例钢板的轧制工艺
奥氏体温度 | 待温坯厚度 | 二开温度 | 终轧温度 | 返红温度 | |
实施例1 | 1108 | 88 | 890 | 839 | 588 |
实施例2 | 1109 | 66 | 860 | 831 | 580 |
实施例3 | 1106 | 110 | 830 | 821 | 563 |
表3实施例钢板的力学性能性能
由图1可见,钢板组织以块状铁素体为主,含有极少量的贝氏体体,组织均匀细小并且致密,有利于产品高强度、低屈强比、高韧性、易焊接、抗疲劳等性能。
综上,本发明采用TMCP轧制技术,应用短流程、低成本的制造方法,有效消除了钢板的内应力。开发的Q370qE-HPS桥梁用钢,满足了桥梁厂易焊接、高韧性、质量稳定的高性能桥梁钢板。通过成本优化,有效降低了产品制造成本,提高了企业的竞争能力,增加了企业经济效益。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (6)
1.一种低成本高性能Q370qE-HPS桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.05%~0.08%,Si:0.10%~0.40%,Mn:1.61%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.030%~0.050%,Ti:0.010%~0.018%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.05%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
2.根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢,其特征在于:板厚16~30mm,其化学成分及质量百分比如下:C:0.05%~0.07%,Si:0.10%~0.20%,Mn:1.61%~1.65%,P≤0.015%,S≤0.0030%,Nb:0.030%~0.040%,Ti:0.010%~0.015%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.05%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
3.根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢,其特征在于:板厚30~50mm,其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.15%~0.25%,Mn:1.63%~1.68%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.050%,Ti:0.010%~0.015%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.0005%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
4.根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢,其特征在于:板厚50~60mm,其化学成分及质量百分比如下:C:0.06%~0.08%,Si:0.20%~0.40%,Mn:1.65%~1.70%,P≤0.015%,S≤0.0030%,Nb:0.040%~0.050%,Ti:0.010%~0.015%,残余Ni≤0.05%,Cr:0.20%~0.30%,残余Mo≤0.05%,残余Cu≤0.05%,残余B≤0.0005%,N≤0.005%,Al:0.020%~0.050%,余量为Fe和杂质。
5.根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢,其特征在于:钢板显微组织包括铁素体、珠光体和10%~30%贝氏体。
6.一种低成本高性能Q370qE-HPS桥梁钢的生产方法,其特征在于:应用于权利要求1-5任意一项,无需回火处理,包括按成分设计体系配比备料→铁水预处理→顶底复吹转炉冶炼→LF炉精炼→RH真空处理→板坯浇注→步进炉加热→高压水除鳞→控制轧制冷却→轧后处理,
控制轧制冷却工艺:奥氏体温度1100~1110℃,待温坯厚度根据钢板厚度调整2~4倍,二开温度根据订单厚度调整820~990℃,终轧温度为820±20℃,采用超快冷冷却至560~590℃,钢板冷却后及时下线进缓冷坑进行堆冷,堆冷24小时后进行剪切、标识、表检、探伤、入库。
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