CN116140355A - 一种析出强化不锈钢热轧钢卷的制造方法 - Google Patents
一种析出强化不锈钢热轧钢卷的制造方法 Download PDFInfo
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Abstract
本发明涉及析出强化不锈钢热加工领域,一种析出强化不锈钢热轧钢卷及制造方法,包括以下步骤:步骤一:在析出强化不锈钢连铸板坯入加热炉前进行表面修磨;步骤二:将连铸板坯装入连续式加热炉;步骤三:连铸坯出加热炉后投高压水除磷,压力控制在30‑40MPa;步骤四:将连铸坯送入粗轧机组,投入5或7道次轧制,出口温度控制在1000‑1010℃,目标厚度35‑45mm;步骤五:在粗轧后投入热卷箱;步骤六:将钢卷送入精轧机组,投入7道次轧制,终轧温度890‑930℃,目标厚度4‑7mm;步骤七:轧制后投入层流冷却,使钢卷温度快速降至400‑500℃卷取。本发明可生产宽度1300‑1500mm的热轧钢卷,且边部质量良好,流程短、生产效率高,产品满足了传送带等行业对宽幅析出强化不锈钢的需求。
Description
技术领域
本发明涉及析出强化不锈钢热加工领域,特别是提供一种析出强化不锈钢热轧钢卷的制造方法。
背景技术
析出强化不锈钢由于具有焊接性好、时效处理简单、强度高、耐磨性好、热膨胀系数低等优点,其板材被用于传送带、热压模板、汽车弹性元件等领域。
由于此类钢种合金元素含量高,铸造时容易发生枝晶间的元素偏析,造成铸坯轧制时易发生层间开裂,同时在轧制时由于强化相的析出,大幅缩小了其热轧窗口,极易产生边裂,并且随着轧制成品宽度的增加,边裂的程度也随之增加。目前基本采用“模铸钢锭→开坯→热轧”的工艺生产析出强化不锈钢的带材,但鉴于上述原因,幅宽基本限制在900mm以内。而对于幅宽大于1300mm甚至1500mm的带材,国内基本无法生产。
本发明可生产宽度1300-1500mm的热轧钢卷,且边部质量良好,流程短、生产效率高,产品满足了传送带等行业对宽幅析出强化不锈钢的需求。
发明内容
本发明的目的就是针对上述问题,提供一种析出强化不锈钢热轧钢卷的制造方法。
本发明的目的是这样实现的:一种析出强化不锈钢热轧钢卷,其化学成分重量百分比为C≤0.07%,Si≤1.00%,Mn≤1.00%,P≤0.040%,S≤0.030%,Cr:15.00-17.50%,Ni:3.00-5.00%,Cu:3.00-5.00,Nb:0.15-0.45%,其余为Fe与不可避免的杂质;其铸坯宽度为1300-1500mm,厚度为160-220mm,坯重10-30吨。
一种析出强化不锈钢热轧钢卷的制造方法,包括以下步骤:步骤一:在析出强化不锈钢连铸板坯入加热炉前进行表面修磨,磨净表面肉眼可见缺陷,修磨率为2.0-3.0%;步骤二:将连铸板坯装入连续式加热炉,加热炉加热段的温度为1100-1150℃,加热炉均热段的温度为1150-1200℃,在均热段的保温时间按(1.00-1.25)t控制,其中t为铸坯入炉前的实测厚度;步骤三:连铸坯出加热炉后投高压水除磷,压力控制在30-40MPa;步骤四:将连铸坯送入粗轧机组,投入5或7道次轧制,出口温度控制在1000-1010℃,目标厚度35-45mm;步骤五:在粗轧后投入热卷箱;步骤六:将钢卷送入精轧机组,投入7道次轧制,终轧温度890-930℃,目标厚度4-7mm;步骤七:轧制后投入层流冷却,使钢卷温度快速降至400-500℃卷取。
本发明的有益效果是:与现在的“模铸钢锭→开坯→热轧”工艺相比,本发明可生产宽度1300-1500mm的热轧钢卷,且边部质量良好,流程短、生产效率高,产品满足了传送带等行业对宽幅析出强化不锈钢的需求。
具体实施方式
针对析出强化不锈钢热轧时容易出现边裂的问题,本发明的发明人细致研究此类材料的特性,对生产过程进行深入分析与研究,提出了一种析出强化不锈钢热轧钢卷的制造方法,该发明主要基于如下构思:采用“连铸板坯→热连轧”的工艺路线生产宽幅的热轧板材,通过将连铸坯在1200℃下长时间保温,可以使枝晶间合金元素在高温下发生短程扩散,达到成分相对均匀的目的,改善了铸坯的热加工性能,避免了轧制时的层间开裂;通过设置合适的初轧、精轧以及终轧温度,同时在粗轧和精轧之间投入热卷箱,使整个热轧过程中基本避免了强化相的析出,降低了其热加工时的强度,使其韧性提高。通过此两项措施,有效解决了钢卷轧制时的边裂问题。
具体的,本发明的析出强化不锈钢热轧钢卷的制造方法尤其适合以Cu作为析出强化元素的不锈钢,例如按照重量百分比,成分为C≤0.07%,Si≤1.00%,Mn≤1.00%,P≤0.040%,S≤0.030%,Cr15.00-17.50%,Ni3.00-5.00%,Cu3.00-5.00,Nb0.15-0.45%的析出强化不锈钢。其铸坯宽度为1300-1500mm,厚度为160-220mm,坯重超过13吨。
本发明所采用的技术方案:步骤一:在析出强化不锈钢连铸板坯入加热炉前进行表面修磨,磨净表面肉眼可见缺陷,修磨率为2.0-3.0%。步骤二:将连铸板坯装入连续式加热炉,加热炉加热段的温度为1100-1150℃,加热炉均热段的温度为1150-1200℃,在均热段的保温时间按(1.00-1.25)t控制,其中t为铸坯入炉前的实测厚度。步骤三:连铸坯出加热炉后投高压水除磷,压力控制在30-40MPa。步骤四:将连铸坯送入粗轧机组,投入5或7道次轧制,出口温度控制在1000-1010℃,目标厚度35-45mm。步骤五:为避免钢卷尾部降温过快,保证头尾温度均匀,在粗轧后投入热卷箱保温。步骤六:将钢卷送入精轧机组,投入7道次轧制,终轧温度890-930℃,目标厚度4-7mm。步骤七:轧制后投入层流冷却,使钢卷温度快速降至400-500℃卷取。
具体的连铸坯宽度为1300-1500mm,厚度为160-220mm,坯重超过13吨。适合以Cu为析出强化元素的析出强化不锈钢。连铸坯在加热炉均热段的温度为1150-1200℃,在均热段的保温时间按(1.00-1.25)T控制,其中T为铸坯入炉前的实测厚度。采用热连轧及对析出强化不锈钢连铸坯进行热轧。采用5或7道次热轧,出口温度控制在1000-1010℃,目标厚度35-45mm。在粗轧后精轧前投入热卷箱保温。采用7道次精轧,终轧温度890-930℃,目标厚度4-7mm。轧制后投入层流冷却,使钢卷温度快速降至400-500℃卷取。
实施例1
步骤一:将尺寸为160×1310×10500mm的析出强化不锈钢连铸板坯进行表面修磨,磨净表面肉眼可见缺陷,修磨率为2.5%,修磨后铸坯实际厚度为156mm。该析出强化不锈钢成分为,C:0.04%,Si:0.28%,Mn:0.52%,P:0.025%,S:0.001%,Cr:15.37%,Ni:4.4%,Cu:3.2%,Nb:0.22%。
步骤二:将连铸坯装入连续式加热炉,加热炉加热段的温度为1120℃,加热炉均热段的温度为1160℃,在均热段的保温时间为168min。
步骤三:铸坯出加热炉后投高压水除磷,压力控制在32MPa。
步骤四:将铸坯送入粗轧机组,投入5道次轧制,出口温度在1008℃,目标厚度43mm。
步骤五:为避免钢卷尾部降温过快,保证头尾温度均匀,在粗轧后投入热卷箱保温。
步骤六:将钢卷送入精轧机组,投入7道次轧制,终轧温度915℃,目标厚度7mm。
步骤七:轧制后投入层流冷却,使钢卷温度快速降至485℃卷取。
轧制完毕后钢卷边部质量良好。
实施例2
步骤一:将尺寸为200×1460×10500mm的析出强化不锈钢连铸板坯进行表面修磨,磨净表面肉眼可见缺陷,修磨率为3.0%,修磨后铸坯实际厚度为194mm。该析出强化不锈钢成分为,C:0.03%,Si:0.33%,Mn:0.51%,P:0.022%,S:0.001%,Cr:15.46%,Ni:4.8%,Cu:3.5%,Nb:0.25%。
步骤二:将连铸坯装入连续式加热炉,加热炉加热段的温度为1150℃,加热炉均热段的温度为1180℃,在均热段的保温225min。
步骤三:铸坯出加热炉后投高压水除磷,压力控制在38MPa。
步骤四:将铸坯送入粗轧机组,投入7道次轧制,出口温度在1003℃,目标厚度38mm。
步骤五:为避免钢卷尾部降温过快,保证头尾温度均匀,在粗轧后投入热卷箱保温。
步骤六:将钢卷送入精轧机组,投入7道次轧制,终轧温度895℃,目标厚度4mm。
步骤七:轧制后投入层流冷却,使钢卷温度快速降至415℃卷取。
轧制完毕后钢卷边部质量良好。
以上所述仅为本发明的具体实施例,但本发明所保护范围的结构特征并不限于此,任何本领域的技术人员在本发明的领域内,所作的变化或修饰皆涵盖在本发明的专利范围内。
Claims (2)
1.一种析出强化不锈钢热轧钢卷,其特征在于:其化学成分重量百分比为C≤0.07%,Si≤1.00%,Mn≤1.00%,P≤0.040%,S≤0.030%,Cr:15.00-17.50%,Ni:3.00-5.00%,Cu:3.00-5.00,Nb:0.15-0.45%,其余为Fe与不可避免的杂质;其铸坯宽度为1300-1500mm,厚度为160-220mm,坯重10-30吨。
2.一种析出强化不锈钢热轧钢卷的制造方法,其特征在于:包括以下步骤:
步骤一:在析出强化不锈钢连铸板坯入加热炉前进行表面修磨,磨净表面肉眼可见缺陷,修磨率为2.0-3.0%;
步骤二:将连铸板坯装入连续式加热炉,加热炉加热段的温度为1100-1150℃,加热炉均热段的温度为1150-1200℃,在均热段的保温时间按(1.00-1.25)t控制,其中t为铸坯入炉前的实测厚度;
步骤三:连铸坯出加热炉后投高压水除磷,压力控制在30-40MPa;
步骤四:将连铸坯送入粗轧机组,投入5或7道次轧制,出口温度控制在1000-1010℃,目标厚度35-45mm;
步骤五:在粗轧后投入热卷箱;
步骤六:将钢卷送入精轧机组,投入7道次轧制,终轧温度890-930℃,目标厚度4-7mm;
步骤七:轧制后投入层流冷却,使钢卷温度快速降至400-500℃卷取。
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