CN108998731B - 大口径单道直焊缝压力管道用铬钼钢板及其生产方法 - Google Patents
大口径单道直焊缝压力管道用铬钼钢板及其生产方法 Download PDFInfo
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- 238000009749 continuous casting Methods 0.000 claims abstract description 3
- 239000011733 molybdenum Substances 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 12
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
本发明提供了一种大口径单道直焊缝压力管道用铬钼钢板及其生产方法,所述钢板的成分按重量百分比计如下:C 0.08%~0.12%、Si 0.10%~0.30%、Mn 0.40%~0.60%、P≤0.010%、S≤0.003%、Cr 3.0%~3.5%、Mo 1.20%~1.60%、Nb 0.02%~0.05%、Als 0.015%~0.050%,余量为Fe及不可避免夹杂;生产方法包括铁水预处理—转炉冶炼—炉外精炼—连铸—铸坯加热—控轧控冷—热处理;通过全新的化学成分设计和工艺路线制造的大口径单道直焊缝压力管道用铬钼钢板具有优异的常温拉伸性能,整板横向性能均匀,不平度在8mm/m以下,显著提高压力管道的安全性和运行效率。
Description
技术领域
本发明属于金属材料领域,尤其涉及一种大口径单道直焊缝压力管道用铬钼钢板及其生产方法。
背景技术
压力管道是利用一定的压力,用于输送气体或者液体的管状设备,其范围规定为最高工作压力大于或者等于0.1MPa(表压)的气体、液化气体、蒸汽介质或者可燃、易爆、有毒、有腐蚀性、最高工作温度高于或者等于标准沸点的液体介质,且公称直径大于50mm的管道,按用途分为工业管道、公用管道和长输管道,其中工业管道主要应用在炼油、化工、冶金、电力等行业,尤其在炼化领域,随着我国经济的不断发展,石油化工产业也得到了蓬勃发展,一些年产量超1500万吨的炼化一体化项目陆续得到政府批复,并陆续开工建设,出于提高生产效率、合理利用能源及保护环境等因素考虑,大部分装置采用模块化设计,单体重量在几百吨以上,配套的管道设计直径到达了1500mm以上,由于管径超大,若制管钢板宽度不够,就只能采用两张钢板压制成半圆形进行拼焊,存在问题是钢管制成后存在两道焊缝,一般来讲焊缝链接处往往是最薄弱环节,较单道焊缝比双道焊缝风险增加一倍,对于如此大的工程来讲,管道焊缝越多风险越大,因此,管道安全对整个项目来讲非常重要。
发明《一种超宽薄规格桥梁用结构钢板及其生产方法》(公开号:CN 102766806 B)公开的结构钢板成分体系考虑桥梁实际应用情况,其化学成分及含量如下:C 0.12%~0.17%、Si 0.20%~0.45%、Mn 1.25%~1.50%、P≤0.020%、S≤0.010%、Nb 0.02%~0.05%、Ti 0.008%~0.030%、Als 0.015%~0.050%,钢板采用控制加正火态交货,最大宽度规格为4100mm。
发明《一种超宽规格超大单重管线钢X80卷板及其生产工艺》(CN 103789705 B)公开的X80管线钢应用领域为管线卷板,其化学成分及含量如下:C 0.02%~0.12%、Si0.10%~0.50%、Mn 1.00%~2.00%、P≤0.02%、S≤0.01%、Nb 0.02%~0.10%、V0.01%~0.10%、Ti 0.01%~0.08%、Cr 0.20%~1.00%、Mo 0.10%~0.80%,钢板的交货状态为控轧控冷,最大宽度规格为1750mm。
发明内容
本发明的目的在于克服上述问题和不足而提供一种用以满足在制造超大口径管道时,只需要一道焊缝就可以完成制管的大口径单道直焊缝压力管道用铬钼钢板及其生产方法。
本发明意在提供一种大口径(直径1590mm以上)单道直焊缝压力管道用铬钼钢板及其生产方法。在免除铬钼钢板生产过程中采用高温正火或淬火工序的情况下,综合性能、横向均匀性、板型等指标仍很优异,同时解决了因钢板宽度不足无法制造1600mm以上单焊缝超大口径管道的技术难题,且延长管道使用寿命,降低事故发生概率,挺高生产效率该发明能够强有力地支撑我国石油炼化行业向大型化、集约化、高效化发展。
本发明目的是这样实现的:
一种大口径单道直焊缝压力管道用铬钼钢板,所述钢板化学成分按重量百分比为:C 0.08%~0.12%、Si 0.10%~0.30%、Mn 0.40%~0.60%、P≤0.010%、S≤0.003%、Cr 3.0%~3.5%、Mo 1.20%~1.60%、Nb 0.02%~0.05%、Als 0.015%~0.050%,余量为Fe及不可避免夹杂。
所述钢板厚度规格为15mm~50mm,宽度规格为5000mm~5300mm,所述钢板厚度不平度在8mm/m以下。
本发明成分设计理由如下:
C:C是钢中的必不可少的强化元素,在固溶强化和析出强化过程中起到提高强度的作用,但过高的C含量对塑韧性和焊接不利,因此本发明将C含量范围设定在0.08%~0.12%。
Si:加入Si是为了炼钢过程中脱氧与提高机体的强度,Si还有抑制渗碳体形成的作用。如果添加过量的Si,母材及其焊接热影响区的韧性就会显著降低,因此本发明将Si含量范围设定在0.10%~0.30%。
Mn:Mn是良好的脱氧剂和脱硫剂。提高Mn的含量,钢的淬透性增加,含量增加到一定程度后,会导致焊接性能下降尤其是严重恶化焊接热影响区的韧性,另外,过高的Mn含量还会增加连铸坯中心偏析,使钢板性能的各项异性增加,因此本发明将Mn含量范围设定在0.40%~0.60%。
P、S:是钢中不可避免的杂质元素,尽量越低越好,但出于成本考虑,又不能无限制的低,因此本发明将P、S含量上限分别设定为0.010%、0.003%。
Cr:是强烈的碳化物形成元素,它与钢中的C生成稳定的碳化物,起到常温及高温强度作用,为了管道具有足有的强度,因此本发明将Cr含量范围设定在3.0%~3.5%。
Mo:Mo在钢中能推迟奥氏体转变孕育时间,使珠光体和铁素体转变曲线右移,促进中温转变,提高淬透性,同时Mo是强碳化物形成元素,回火过程中固溶于基体中的钼容易形成MxC等合金化合物,保证回火热处理的强度,但Mo含量过高反而会导致钢的脆化,因此本发明将Mo含量范围设定在1.20%~1.60%。
Nb:Nb对细化晶粒的作用十分明显,通过热轧过程中NbC应变诱导析出阻碍形变奥氏体的回复、再结晶,经过控制轧制和控制冷却使再结晶区轧制的变形奥氏体组织在相变时变为细小的相变产物,以使钢具有高强度和高韧性,本发明是配合C含量添加适量Nb发挥NbC的作用。因此本发明将Nb含量范围设定在0.02%~0.05%。
Als:Al是炼钢时的脱氧定氮剂,并且能细化钢的晶粒,铝和铬、硅复合应用,可以显著提高钢的高温不起皮性和耐高温腐蚀能力。铝会影响钢的热加工性能、焊接性能和切削加工性能,因此本发明将Als含量范围设定在0.015%~0.050%。
本发明技术方案之二是提供一种大口径单道直焊缝压力管道用铬钼钢板的生产方法,包括铁水预处理—转炉冶炼—炉外精炼—连铸—铸坯加热—控轧控冷—热处理。
(1)坯料规格:为了保证钢板具有足够的长度尺寸,坯料宽度为2000mm~2300mm;坯料长度需要按宽度规格轧制,为了保证轧制板型和防止边部缺陷,坯料长度下限为3000mm,但同时为了保证横向性能,必须有足够的纵向延展,因此坯料不能太长,本发明坯料长度上限为4000mm;
(2)铸坯加热:铸坯加热温度为1200~1250℃,保温时间控制为5~15min/cm;
(3)控轧控冷
再结晶区控制轧制开始温度为1080~1150℃,再结晶阶段钢坯轧制方式为纵向-横向轧制,即纵向直接轧制至目标宽度,高温纵轧阶段单道次压下率为10%~20%,然后转钢90°横向轧制到中间坯厚度,中间坯厚度与成品厚度的比值为2.0~3.0,总变形率为50%~65%;
未再结晶区采用横轧方式,控制轧制开始温度为890~940℃,未再结晶区控制轧制终止温度为850~800℃,钢板目标宽度,即5000mm以上,由于钢板宽幅大散热快,温度较低较快,轧制扭矩非常大,为了保证钢板板型防止波浪翘曲,单道次压下率为5%~10%,未再结晶区累积变形率≥60%;
之后进行控冷,层流冷却开始冷却温度为780~820℃,冷却速度为10~25℃/s,返红温度为500~600℃,出水后进热矫直机矫直,冷却后钢板不平度在8mm/m以下。采用控轧控冷工艺是为了使晶粒充分细化,得到强韧配比合理金相组织,弥补常规铬钼钢的需要正火或淬火的热处理工艺。
(4)热处理:热处理工艺只采用回火工艺,钢板到温装炉,温度控制在690~720℃,保温时间为3~5min/mm,免除高温正火或淬火工艺是避免再次高温加热温度和冷却,钢板宽幅太大受热及冷却时温度不均匀,造成钢板边部波浪、镰刀弯等不可逆转的缺陷。
上述成分设计、控制控冷及热处理工艺参数的设置能够使钢板获得贝氏体回火组织+铁素体组织,该组织不仅具有良好的强韧配比、常温及高温强度和塑韧性,而且组织稳定,钢板的横向性能及厚度公差均匀,制造的大口径压力管道安全性、可靠性更高。
本发明的有益效果在于:通过全新的化学成分设计和生产工艺路线制造的一种大口径单道直焊缝压力管道用铬钼钢板,其优异的力学性能体现在优异的常温拉伸性能Rel≥330Mpa、Rm≥540MPa、A≥20%、高温强度500℃的Rel≥200Mpa、低温韧性(-20℃)KV2≥70J、钢板宽度规格为5000mm~5300mm,整板横向性能均匀,不平度在8mm/m以下,能够制造直径在1590mm以上大口径的单焊缝压力管道,能显著提高压力管道的安全性和运行效率。
具体实施方式
下面通过实施例对本发明作进一步的说明。
本发明实施例根据技术方案的组分配比,进行铁水预处理—转炉冶炼—炉外精炼—连铸—铸坯加热—控轧控冷—热处理。本发明实施例钢的成分见表1。本发明实施例钢钢坯规格见表2。本发明实施例钢的主要控制轧制参数见表3。本发明实施例钢的主要控制冷却工艺参数见表4。本发明实施例钢的热处理参数见表5。本发明实施例钢的横向厚度公差见表6。本发明实施例钢的性能见表7。
表1本发明实施例钢的成分(wt,%)
实施例 | C | Si | Mn | P | S | Cr | Mo | Nb | Als |
1 | 0.08 | 0.15 | 0.42 | 0.006 | 0.002 | 3.0 | 1.28 | 0.023 | 0.022 |
2 | 0.09 | 0.24 | 0.46 | 0.008 | 0.003 | 3.3 | 1.33 | 0.037 | 0.035 |
3 | 0.10 | 0.26 | 0.53 | 0.007 | 0.001 | 3.2 | 1.45 | 0.046 | 0.037 |
4 | 0.11 | 0.30 | 0.60 | 0.009 | 0.003 | 3.5 | 1.58 | 0.048 | 0.044 |
5 | 0.08 | 0.12 | 0.43 | 0.010 | 0.002 | 3.4 | 1.56 | 0.050 | 0.034 |
6 | 0.12 | 0.29 | 0.59 | 0.009 | 0.001 | 3.1 | 1.22 | 0.022 | 0.023 |
表2本发明实施例钢钢坯规格
实施例 | 坯料长度/mm | 坯料宽度/mm |
1 | 3000 | 2050 |
2 | 3200 | 2100 |
3 | 3500 | 2200 |
4 | 3600 | 2250 |
5 | 3800 | 2250 |
6 | 4000 | 2300 |
表3本发明实施例钢的主要控制轧制参数
表4本发明实施例钢的主要控制冷却工艺参数
表5本发明实施例钢的热处理参数
实施例 | 回火温度/℃ | 保温时间/min/mm |
1 | 710 | 5 |
2 | 720 | 4 |
3 | 720 | 3 |
4 | 700 | 3 |
5 | 690 | 4 |
6 | 690 | 5 |
表6本发明实施例钢的横向厚度公差
注:在钢板同一宽度直线上平均取5个测点进行厚度测量
表7本发明实施例钢的性能
根据以上结果可以得出,本发明通过全新的化学成分设计和生产工艺路线制造的大口径单道直焊缝压力管道用铬钼钢板,其优异的力学性能体现在优异的常温拉伸性能Rel≥330Mpa、Rm≥540MPa、A≥20%、高温强度500℃的Rel≥200Mpa、低温韧性(-20℃)KV2≥70J、钢板宽度规格为5000mm~5300mm,整板横向性能均匀,不平度在8mm/m以下。
Claims (1)
1.一种大口径单道直焊缝压力管道用铬钼钢板,其特征在于,所述钢板的成分按重量百分比计如下:C 0.08%~0.12%、Si 0.10%~0.30%、Mn 0.40%~0.60%、P≤0.010%、S≤0.003%、Cr 3.0%~3.5%、Mo 1.20%~1.60%、Nb 0.02%~0.05%、Als 0.015%~0.050%,余量为Fe及不可避免夹杂;所述钢板厚度规格为15mm~50mm,宽度规格为5000mm~5300mm,所述钢板厚度不平度在8mm/m以下;所述铬钼钢板的生产方法包括铁水预处理—转炉冶炼—炉外精炼—连铸—铸坯加热—控轧控冷—热处理,
(1)坯料规格:连铸后,坯料宽度为2000mm~2300mm;坯料长度下限为3000mm,上限为4000mm;
(2)铸坯加热:铸坯加热温度为1200~1250℃,保温时间控制为5~15min/cm;
(3)控轧控冷:
再结晶区控制轧制开始温度为1080~1150℃,再结晶阶段钢坯轧制方式为纵向-横向轧制,即纵向直接轧制至目标宽度,纵轧阶段单道次压下率为10%~20%,然后转钢90°横向轧制到中间坯厚度,中间坯厚度为2.0~3.0倍成品厚度,总变形率为50%~65%;
未再结晶区采用横轧方式,控制轧制开始温度为890~940℃,未再结晶区控制轧制终止温度为850~800℃,钢板目标宽度,即5000mm以上,单道次压下率为5%~10%,未再结晶区累积变形率≥60%;
之后进行控冷,层流冷却开始冷却温度为780~820℃,冷却速度为10~25℃/s,返红温度为500~600℃,出水后进热矫直机矫直,冷却后钢板不平度在8mm/m以下;
(4)热处理:采用回火工艺,温度控制在690~720℃,保温时间为2~5min/mm。
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