CN114769314A - 一种低轧制比高致密度磨球钢热轧圆钢的生产方法 - Google Patents
一种低轧制比高致密度磨球钢热轧圆钢的生产方法 Download PDFInfo
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Abstract
本发明属于钢铁轧钢生产技术领域,涉及一种低轧制比高致密度磨球钢热轧圆钢的生产方法。本发明通过采用高温轧制与轧制力心部渗透技术、焊合铸坯心部疏松、缩孔等质量缺陷,提高热轧圆钢致密度;高温快速收集及围挡避风堆冷方式,弥补了低轧制比磨球钢圆钢致密度与超声波质量等级低,同时避免了磨球钢圆钢端部产生穿晶应力裂纹,降低了精整成本,提高了产品合格率。
Description
技术领域
本发明属于钢铁轧钢生产技术领域,涉及一种低轧制比高致密度磨球钢热轧圆钢的生产方法。
背景技术
2021年前,中小棒高碳铬轴承钢Ф40~70mm规格圆钢出现超声波探伤不合格和端部开裂现象,超声波探伤不合格为中心长条缺陷,金相分析为中心裂纹或未焊合的孔洞;端部开裂为刚直的穿晶应力裂纹。因裂纹而产生的废品增多,会造成成本提高,资源浪费,因此需要找一种方法来解决,提高产品合格率。
发明内容
针对现有技术中存在不足,本发明所要解决的技术问题是:保证磨球钢热轧圆钢超声波满足EN 10308标准探伤平底孔≤Ф2.0mm,同时避免圆钢端部产生穿晶应力裂纹。220mm×220mm方坯轧制Ф40~70mm规格,轧制比>12~38,不能满足部门内贸磨球钢用户需求(轧制比≥15)。
本发明通过采用高温轧制与轧制力心部渗透技术、焊合铸坯心部疏松、缩孔等质量缺陷,提高热轧圆钢致密度;高温快速收集及围挡避风堆冷方式,弥补了低轧制比磨球钢圆钢致密度与超声波质量等级低,同时避免了磨球钢圆钢端部产生穿晶应力裂纹,降低了精整成本,提高了产品合格率。该磨球钢与高碳铬轴承钢同属于裂纹敏感性高碳钢,其生产工艺可相互借鉴。
一种低轧制比高致密度磨球钢热轧圆钢,按质量百分比计的化学成份包括:C0.95~1.05%、Si 0.15~0.40%、Mn 0.95~1.05%、P≤0.025%、S≤0.035%、Cr 0.65~0.75%、Ni≤0.25%、Cu≤0.40%、Mo≤0.10%、V≤0.030%、Sn≤0.030%、Al 0.015~0.030%、Ti 0.010~0.025%、N 0.0060~0.0100%、O≤0.0014、H≤0.0002%、Di≥3.50,其余为铁及参与元素。
一种低轧制比高致密度磨球钢热轧圆钢的生产方法,包括如下步骤:铁水+废钢、转炉、LF精炼、VD真空脱气、连铸、入坑缓冷、钢坯加热、除鳞、高温轧制、剪切分段、高温收集、避风堆冷、精整、超声波探伤、检验、包装、称重、标记、入库;
其中,
入坑缓冷步骤中:铸坯入坑缓冷时间≥36h,出坑温度≤200℃,确保铸坯内部气体充分扩散,防止铸坯内部产生白点。
钢坯加热步骤中:预热段温度≤860℃,加热一段温度900~1150℃,加热二段温度1180~1230℃,均热段温度1170~1220℃,总加热时间≥240min,加热二段+均热段时间≥150min,通过控制钢坯加热温度与加热时间,保证铸坯均匀烧透,铸坯心部温度较高时,轧制时有利于改善疏松、缩孔等缺陷。
高温轧制步骤中:开轧温度为1040~1120℃,终轧温度≥900℃;
轧制力心部渗透技术:全线轧槽冷却水开到最大,成品轧制速度降低16.9%~19.1%。
优选地,轧制速度:Ф40~70mm由4.51到1.73m/s降至3.75到1.40m/s。
控制思路及原理:降温降速轧制,利用粗轧单道次大压下量轧制和粗轧后轧件表面穿水冷却,中间轧件内部温度高于表面温度,使得轧制力向铸坯心部渗透,控制轧制,提高轧制力向心部渗透的效果。根据艾克隆德轧制力公式,轧制速度降低10%以上,可提高轧制过程粘度系数,增加单位轧制力。在塑性变形中,有效地向轧件心部渗透,进而有效地改善铸坯心部质量,压合疏松、缩孔质量缺陷,提高钢材致密度。
高温收集步骤中:500℃以上高温快速收集;
避风堆冷步骤中,采用围挡避风堆冷,可防止磨球钢圆钢端部产生穿晶应力裂纹。
本发明所述生产方法制得的低轧制比高致密度磨球钢热轧圆钢,经检测:
①磨球钢圆钢超声波探伤(执行EN 10308标准平底孔≤Ф2.0mm)合格率100%。
②磨球钢圆钢低倍组织(按GB/T 226和GB/T 1979标准检验和评级)一般疏松≤0.5级、中心疏松≤1.0级、锭型偏析0级、中心偏析0级,未发现目视可见的缩孔、气泡、裂纹、夹杂、翻皮和白点缺陷。
③磨球钢端部开裂比例由10.72%降低至0,折算后吨钢降本约2.68元。
本发明有益效果如下:
(1)本发明方法有效地压合疏松、缩孔质量缺陷,提高了磨球钢热轧圆钢致密度,同时避免了圆钢端部产生穿晶应力裂纹,降低成本。
(2)本发明保证磨球钢圆钢超声波满足EN 10308标准探伤平底孔≤Ф2.0mm,合格率100%;
(3)低倍质量满足外来协议标准要求;未发现目视可见的缩孔、气泡、裂纹、夹杂、翻皮和白点缺陷;质量显著提升。
附图说明
图1为提高收集温度≥500℃后,不开裂圆钢端面照片。
图2为开裂圆钢的照片。
具体实施方式
下面结合附图以及具体实施例对本发明作进一步的说明,但本发明的保护范围并不限于此。
实施例1
一种低轧制比高致密度磨球钢热轧圆钢的生产方法,包括如下步骤:铁水+废钢、转炉、LF精炼、VD真空脱气、连铸、入坑缓冷、钢坯加热、除鳞、高温轧制、剪切分段、高温收集、避风堆冷、精整、超声波探伤、检验、包装、称重、标记、入库;
其中,步骤中具体工艺要求为:
入坑缓冷步骤中:铸坯入坑缓冷时间≥36h,出坑温度≤200℃;
钢坯加热步骤中:预热段温度≤860℃,加热一段温度900~1150℃,加热二段温度1180~1230℃,均热段温度1170~1220℃,总加热时间≥240min,加热二段+均热段时间≥150min;
高温轧制步骤中:开轧温度为1040~1120℃,终轧温度≥900℃;
轧制力心部渗透技术:全线轧槽冷却水开到最大,成品轧制速度Ф40~70mm由4.51到1.73m/s降至3.75到1.40m/s。
高温收集步骤中:500℃以上高温快速收集;
避风堆冷步骤中,采用围挡避风堆冷。
通过上述工艺获得的Ф70mm圆钢,其化学成份按质量百分比计包括:C 0.95%、Si0.25%、Mn 1.05%、P 0.015%、S 0.015%、Cr 0.70%、Ni 0.20%、Cu 0.20%、Mo 0.05%、V 0.010%、Sn 0.020%、Al 0.015%、Ti 0.015%、N 0.0080%、O 0.0010、H 0.0001%、Di≥3.50,其余为铁及参与元素。如图1所示,未发现目视可见的缩孔、气泡、裂纹、夹杂、翻皮和白点缺陷,相较于图2的裂纹,图1产品经超声波探伤合格率100%。
所述实施例为本发明的优选的实施方式,但本发明并不限于上述实施方式,在不背离本发明的实质内容的情况下,本领域技术人员能够做出的任何显而易见的改进、替换或变型均属于本发明的保护范围。
Claims (5)
1.一种低轧制比高致密度磨球钢热轧圆钢的生产方法,其特征在于:包括如下步骤:铁水+废钢、转炉、LF精炼、VD真空脱气、连铸、入坑缓冷、钢坯加热、除鳞、高温轧制、剪切分段、高温收集、避风堆冷、精整、超声波探伤、检验、包装、称重、标记、入库;
其中,
入坑缓冷步骤中:铸坯入坑缓冷时间≥36h,出坑温度≤200℃;
钢坯加热步骤中:预热段温度≤860℃,加热一段温度900~1150℃,加热二段温度1180~1230℃,均热段温度1170~1220℃,总加热时间≥240min,加热二段+均热段时间≥150min;
高温轧制步骤中:开轧温度为1040~1120℃,终轧温度≥900℃;
轧制力控制方式:全线轧槽冷却水开到最大,成品轧制速度降低16.9%~19.1%;
高温收集步骤中:500℃以上高温快速收集。
2.如权利要求1所述的一种低轧制比高致密度磨球钢热轧圆钢的生产方法,其特征在于:高温轧制步骤中,轧制速度:Ф40~70mm由4.51到1.73m/s降至3.75到1.40m/s。
3.如权利要求1所述的一种低轧制比高致密度磨球钢热轧圆钢的生产方法,其特征在于:避风堆冷步骤中,采用围挡避风堆冷。
4.一种低轧制比高致密度磨球钢热轧圆钢,是通过权利要求1~3任一项所述生产方法得到的。
5.如权利要求4所述的一种低轧制比高致密度磨球钢热轧圆钢,其特征在于,其化学成份按质量百分比计如下:C 0.95~1.05%、Si 0.15~0.40%、Mn 0.95~1.05%、P≤0.025%、S≤0.035%、Cr 0.65~0.75%、Ni≤0.25%、Cu≤0.40%、Mo≤0.10%、V≤0.030%、Sn≤0.030%、Al 0.015~0.030%、Ti 0.010~0.025%、N 0.0060~0.0100%、O≤0.0014、H≤0.0002%、Di≥3.50,其余为铁及参与元素。
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