CN114381664B - 一种耐腐蚀管线用厚规格x80ms钢板的生产方法 - Google Patents
一种耐腐蚀管线用厚规格x80ms钢板的生产方法 Download PDFInfo
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Abstract
本发明提供了一种耐腐蚀管线用厚规格X80MS钢板的生产方法,该方法通过洁净钢冶炼、连铸、加热、控制控冷及堆冷工艺,突破了40mm以上管线钢内部组织和力学性能无法满足要求的瓶颈,同时在行业内首次采用控制轧制生产出厚度>40mm~60mm的满足耐腐蚀管线钢,获得的钢板内部组织为85~95针状铁素体+5~15贝氏体,屈服强度570~640MPa,抗拉强度642~813MPa,伸长率23~33,V型‑30℃纵向冲击功171~295J,‑15℃落锤撕裂实验平均值92,焊接裂纹敏感系数Pcm≤0.23,耐候指数≥6.0,可满足厚规格管线钢对低温韧性、加工性能及焊接性能的要求,具有良好的应用前景。
Description
技术领域
本发明涉及到中厚板领域,具体涉及到一种耐腐蚀管线用厚规格X80MS钢板的生产方法。
背景技术
X80MS属于美标API 5L中管线钢,其具有低温韧性优良、加工性能和焊接性能好等特点。随着石油、天然气需求量大幅度增长,输送能力有了长足发展,对管线钢的质量提出了更高的要求,如耐候性能、使用寿命等。
CN 103225047 B公开了一种厚度≥26.5mm的X80管线用钢及其生产方法,采用两段粗轧、精轧、快速冷却、矫直的工艺获得了厚度≥26.5mm;CN 110656228 A公开了厚规格X80管线钢的生产方法,获得的钢板厚度≥18mm。
但上述方案获得的钢板,均未突破40mm以上管线钢对内部组织及力学性能达到使用需求的瓶颈,无法满足恶劣环境下厚壁化的要求。
发明内容
为解决上述技术缺陷,本发明的目的在于提供一种耐腐蚀管线用厚规格X80MS钢板的生产方法,通过该方法生产出的钢板能够突破40mm以上管线钢对内部组织及力学性能达到使用需求的瓶颈,能够满足满足恶劣环境下厚壁化的要求。
为达到上述目的,本发明采取的技术方案如下:一种耐腐蚀管线用厚规格X80MS钢板的生产方法,通过该生产方法生产出的钢板厚度为40<δ≤60mm,包括如下质量百分比的化学成分(单位,wt%):C:0.07~0.13、Si:0.10~0.55、Mn:1.35~1.70、Nb:0.040~0.060、V:0.05~0.06、Ni:0.25~0.35、Cr:0.80~0.95、Cu:0.25~0.70、Mo:0.205~0.35、Als:≤0.05、P:≤0.008、S:≤0.002,其它为Fe和残留元素;
上述耐腐蚀管线用厚规格X80MS钢板的生产方法包括洁净钢冶炼、连铸、加热、控轧控冷及堆冷,具体为:
1)洁净钢冶炼:铁水脱硫后转炉冶炼,入炉铁水S≤0.005、P≤0.050,冶炼过程控制炉渣碱度R按2.5~4.0,之后采用LF+VD精炼,其中VD保压时间≥25min,钢水离站温度1540-1575℃;
2)连铸:中包过热度15±10℃,采用电磁搅拌,全程保护浇铸,保持结晶器液面稳定,铸坯下线后要求堆冷≥24h;
3)加热:预热段温度≤1000℃,加热段温度1220~1240℃,保温段温度1200~1220℃,保温段时间>40min,整体加热时间10~13min/cm;
4)控轧控冷:开轧温度1000℃~1100℃,单道次压下量控制在35~45mm,轧制过程中每间隔一道打一次高压水,终轧温度880℃~930℃,轧制结束,钢板通过ACC快速冷却,冷却速度控制在8~15℃/S,返红温度500~600℃。需要说明的是,通过此轧制工艺,一方面可促使铸坯充分变形再结晶,达到内部晶粒不断破碎、细化和再结晶的目的,为最终钢板内部细小的晶粒度创造条件,另一方面,可促进铸坯内部缺陷的压合,达到内部组织致密,解决压缩比不足造成的内部疏松问题。此外,若冷速过低,钢板内部得到的组织主要是铁素体和珠光体,而冷速过大时,钢板内部主要以贝氏组织为主,仅存在少量铁素体、珠光体甚至没有,而对于管线钢,为同时保证钢板的强度及韧性,必须控制合理的冷却速度。
5)堆冷:钢板矫直后直接下线堆冷,堆冷温度≥400℃,堆冷时间≥24h。通过缓冷,以避免内部应力来不及释放产生内裂,同时进一步促使钢板内部有害气体溢出。
通过上述生产工艺获得的钢板,其内部组织为85~95针状铁素体+5~15贝氏体,屈服强度570~640MPa,抗拉强度642~813MPa,伸长率23~33,V型-30℃纵向冲击功171~295J,-15℃落锤撕裂实验平均值92,焊接裂纹敏感系数Pcm≤0.23,耐候指数≥6.0,突破了40mm以上管线钢内部组织和力学性能无法满足要求的瓶颈,同时在行业内首次采用控制轧制生产出厚度>40mm~60mm的满足耐腐蚀管线钢。
附图说明
下面结合附图及实施例,对本发明的技术特征作进一步描述。
图1为本发明制得钢板头部厚度1/2部位的金相组织(金相显微镜,×500)。
具体实施方式
实施例
提供一种耐腐蚀管线用厚规格X80MS钢板的生产方法,通过该生产方法生产出的钢板厚度为40<δ≤60mm,包含如下质量百分比的化学成分(单位,wt):C:0.07~0.13、Si:0.10~0.55、Mn:1.35~1.70、Nb:0.040~0.060、V:0.05~0.06、Ni:0.25~0.35、Cr:0.80~0.95、Cu:0.25~0.70、Mo:0.205~0.35、Als:≤0.05、P:≤0.008、S:≤0.002,其它为Fe和残留元素。
其生产方法包括:KR铁水预处理、转炉冶炼、LF精炼、VD精炼、连铸、加热、控轧控冷、堆冷;
1)KR铁水预处理工艺:利用KR对铁水进行搅拌脱硫等预处理;
2)转炉冶炼工艺:入炉铁水S≤0.005、P≤0.050,采用优质废钢,冶炼过程控制炉渣碱度R按2.5~4.0,出钢过程采用留钢法(即:保留少部分钢水留在转炉中),避免冶炼过程中的渣、有害物质再次进入钢水,同时出钢过程加入脱氧剂,并采取吹氩搅拌措施;
3)LF精炼工艺:精炼过程吹氩搅拌,加入精炼渣料,造白渣,离站前加入钙线;
4)VD精炼工艺:VD高真空度保压≥25min,VD过程采用微吹氩,VD结束,钢水离站温度控制在1540-1575℃;
5)连铸工艺:浇钢前保证铸机设备状况良好,中包过热度15±10℃,采用电磁搅拌,全程保护浇铸,保证结晶器液面稳定,铸坯下线后要求堆冷≥24h;
6)加热工艺:预热段温度≤1000℃,加热段温度1220~1240℃,保温段温度1200~1220℃,保温段时间>40min,整体加热速度10~13min/cm;
7)控轧控冷:轧制过程采用一阶段“高温、低速、大压下”的轧制工艺,开轧温度1000℃~1100℃,单道次压下量控制在35~45mm,同时轧制过程中每间隔一道打一次高压水,保证表面质量和轧制温度温度,终轧温度在880℃~930℃;轧制结束,钢板进入ACC进行快速冷却,冷却速度控制在8~15℃/S,返红温度500~600℃;
8)堆冷工艺:钢板矫直后及时下线堆冷,堆冷温度≥400℃,堆冷时间≥24h。
本次试生产的60批45-60mm厚X80MS钢板,按GB/T 13299《钢的显微组织评定办法》对钢板的内部组织金相分析,如图1所示,具有85~95针状铁素体+5~15贝氏体。
其机械力学性能按《GB/T21237-2018石油天然气输送管用宽厚钢板》检测,具体指标如下:
其中,屈服强度控制在570~640MPa,抗拉强度控制在642~813MPa;伸长率控制在23-33;V型-30℃纵向冲击功控制在171~295J,-15℃落锤撕裂实验平均值92,完全达到X80标准要求,焊接裂纹敏感系数Pcm≤0.23,耐候指数≥6.0,同时HIC和SSCC试验均通过测试合格。
-15℃落锤撕裂实验平均值92,完全达到X80标准要求。
外检及探伤
所研制的钢板外检严格按照,正品率100,按EN 10160进行探伤,其中达到S2/E3标准的比例为90,达到S1/E1标准的比例为100,达到了预期效果。
以上所描述的仅为本发明的较佳实施例,上述具体实施例不是对本发明的限制,凡本领域的普通技术人员根据以上描述所做的润饰、修改或等同替换,均属于本发明的保护范围。
Claims (1)
1.一种耐腐蚀管线用厚规格X80MS钢板的生产方法,通过该生产方法生产出的钢板厚度为40<δ≤60mm,包括如下质量百分比的化学成分(单位,wt%):C:0.07~0.13、Si:0.10~0.55、Mn:1.35~1.70、Nb:0.040~0.060、V:0.05~0.06、Ni:0.25~0.35、Cr:0.80~0.95、Cu:0.25~0.70、Mo:0.205~0.35、Als:≤0.05、P:≤0.008、S:≤0.002,其它为Fe和残留元素;该钢板内部组织为85~95针状铁素体+5~15贝氏体,屈服强度570~640MPa,抗拉强度642~813MPa,伸长率23~33,V型-30℃纵向冲击功171~295J,焊接裂纹敏感系数Pcm≤0.23,耐候指数≥6.0;
上述耐腐蚀管线用厚规格X80MS钢板的生产方法包括洁净钢冶炼、连铸、加热控轧控冷及堆冷,具体为:
1)洁净钢冶炼:铁水脱硫后转炉冶炼,入炉铁水S≤0.005、P≤0.050,冶炼过程控制炉渣碱度R按2.5~4.0,之后采用LF+VD精炼,其中VD保压时间≥25min,钢水离站温度1540-1575℃;
2)连铸:中包过热度15±10℃,采用电磁搅拌,全程保护浇铸,保持结晶器液面稳定,铸坯下线后要求堆冷≥24h;
3)加热:预热段温度≤1000℃,加热段温度1220~1240℃,保温段温度1200~1220℃,保温段时间>40min,整体加热时间10~13min/cm;
4)控轧控冷:开轧温度1000℃~1100℃,单道次压下量控制在35~45mm,轧制过程中每间隔一道打一次高压水,终轧温度880℃~930℃,轧制结束,钢板通过ACC快速冷却,冷却速度控制在8~15℃/s ,返红温度500~600℃;
5)堆冷:钢板矫直后直接下线堆冷,堆冷温度≥400℃,堆冷时间≥24h。
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