轴承钢连铸坯块状碳化物及其遗传性的控制与研究

徐斌; 程鹏飞; 肖国华; 靳国兵; 郝志超; 陈涛; 孙俊喜

doi:10.7513/j.issn.1004-7638.2023.03.023

轴承钢连铸坯块状碳化物及其遗传性的控制与研究

doi: 10.7513/j.issn.1004-7638.2023.03.023

徐斌^{1, 2,},
程鹏飞¹,
肖国华¹,
靳国兵¹,
郝志超¹,
陈涛¹,
孙俊喜¹

1.
河钢集团邯钢公司技术中心, 河北邯郸 056015
2.
北京科技大学钢铁共性技术协同创新中心, 北京100083

详细信息

作者简介:
徐斌，1980年出生，男，河北衡水人，高级工程师，主要从事特殊钢的质量控制与品种开发，E-mail：xubin01@hbisco.com

中图分类号: TF76
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- 文章访问数: 96
- HTML全文浏览量: 14
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- 被引次数: 0
出版历程
- 收稿日期: 2022-05-05
- 刊出日期: 2023-06-30

Control and research on original lump carbides and their inheritance of continuous casting bearing steel billets

1.
Technique Center of HBIS Group Hansteel Company, Handan 056015, Hebei, China
2.
Collaborative Innovation Center for Steel Common Technology, University of Science and Technology Beijing, Beijing 100083,China

摘要

摘要: 通过Image-Pro Plus软件及金相法对GCr15轴承钢连铸坯在不同的连铸因子（过热度、拉速、二冷强度、电磁搅拌条件）下原始块状碳化物的形态、分布及碳偏析指数间的关系进行研究。结果表明，铸坯碳化物按分布、形态分为三类，沿铸坯晶粒边界集中连续、大面积分布的第一类碳化物；沿晶界分布、以“细长枝条态”向晶粒内无规律延伸的第二类碳化物；以单独形态分布在晶界处、边界圆润光滑、分散分布的第三类碳化物，其中断续分布或单独分布的铸坯块状碳化物经过现有轧制加热工艺处理后，液析碳化物级别均为0～0.5级，以此指导连铸最佳配合工艺参数是拉速0.95 m/min，过热度为20～25 ℃、冷却强度为0.35 L/kg、末端电磁搅拌为350 A、7 Hz。
- 轴承钢 /
- 连铸 /
- 铸坯 /
- 原始块状碳化物 /
- 形态 /
- 遗传性
Abstract: The morphology, distribution and relationship between the original bulk carbides and carbon segregation index of GCr15 bearing steel continuous casting billets under different continuous casting factors (superheat, drawing speed, secondary cooling strength, electromagnetic stirring conditions) were investigated by Image-Pro Plus software and metallographic method. The results show that the heritability of the original bulk carbide of different types of billets, intermittently distributed or individually distributed billet bulk carbide after the existing rolling heating process, the liquid precipitation carbide level is 0-0.5, which guides the best matching process parameters for continuous casting is the drawing speed 0.95 m/min, superheating degree 20-25 ℃, cooling intensity 0.35 L/kg, end electromagnetic stirring 350 A/7 Hz.
- bearing steel /
- continuous casting /
- billets /
- original lump carbides /
- form /
- inheritance

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图 1 轴承钢铸坯碳化物取样位置及数量示意

Figure 1. Sampling position and quantity of carbide in bearing steel billet

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图 2 Ø30 mm规格液析观察面示意

Figure 2. Schematic diagram of liquid analysis observation surface of Ø30 mm specification

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图 3 轴承钢铸坯碳偏析钻孔示意

Figure 3. Schematic diagram of carbon segregation drilling in bearing steel billet

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图 4 不同过热度条件下原始块状铸坯碳化物的形貌特征

Figure 4. Morphological characteristics of the carbides under different superheat conditions

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图 5 不同过热度条件下原始块状铸坯碳化物面积与碳偏析指数间关系

Figure 5. Relationship between carbide area and carbon segregation under different superheat conditions

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图 6 不同拉速条件下原始块状铸坯碳化物的形貌特征

Figure 6. Morphological characteristics of the carbides under different pull velocities

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图 7 不同拉速条件下原始块状铸坯碳化物面积与碳偏析指数间关系

Figure 7. Relationship between carbide area and carbon segregation under different pull velocities

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图 8 不同二冷强度条件下原始块状铸坯碳化物的形貌特征

Figure 8. Morphological characteristics of the carbides under different secondary cold strength

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图 9 不同二冷强度条件下原始块状铸坯碳化物与碳偏析间关系

Figure 9. Relationship between carbide area and carbon segregation under different secondary cold strengths

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图 10 不同末搅条件下原始块状铸坯碳化物的形貌特征

Figure 10. Morphological characteristics of the carbides under different end stirring conditions

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图 11 不同末搅条件下原始块状铸坯碳化物与碳偏析指数间关系

Figure 11. Relationship of carbide area and carbon segregation index under different end stirring conditions

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图 12 不同类型铸坯块状碳化物遗传液析形态

Figure 12. Genetic morphology of different types of blocky carbides in billet

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表 1 连铸试验工艺参数

Table 1. Process parameters of continuous casting test

试验号	试验内容	冷却强度/ (L·kg⁻¹)	过热度/ ℃	拉速/ (m·min⁻¹)	末端电磁搅拌
试验号	试验内容	冷却强度/ (L·kg⁻¹)	过热度/ ℃	拉速/ (m·min⁻¹)	电流/A	频率/Hz
1	过热度	0.35	≥30	0.95	350	8
2		0.35	25～30	0.95	350	8
3		0.35	20～25	0.95	350	8
4	拉速	0.35	20～25	0.85	350	8
5		0.35	20～25	0.95	350	8
6		0.35	20～25	1.15	350	8
7	冷却强度	0.45	20～25	0.95	350	8
8		0.35	20～25	0.95	350	8
9		0.28	20～25	0.95	350	8
10	末端电磁搅拌	0.35	20～25	0.95	350	4
11		0.35	20～25	0.95	350	8
12		0.35	20～25	0.95	350	12

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表 2 现加热炉工艺参数

Table 2. The current process parameters of the heating furnace

预热段		加热段		均热段
温度/℃	保温时间/ h	温度/℃	保温时间/ h	温度/℃	保温时间/ h
≤850	1.0	850～1220	1.5	1220～1250	2

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表 3 不同连铸参数下成品棒材液析基本情况

Table 3. Basic situation of the liquid separation bar under different continuous casting parameters

序号	成品棒材液析检验级别/级
	过热度组			拉速组			冷却强度组			末端电磁搅拌组
	≥30 ℃	25～30 ℃	20～25 ℃	0.85 m/min	0.95 m/min	1.15 m/min	0.45 L/kg	0.35 L/kg	0.28 L/kg	Ⅰ	Ⅱ	Ⅲ
试样1	2.5	1.0	0.5	2.0	0.5	1.0	2.0	1.5	0.5	1.5	0.5	0.5
试样2	2.0	0.5	0	2.0	0	1.0	2.0	1.0	0	2.0	0.5	0.5
试样3	2.0	1.0	0	2.0	0	0.5	2.0	1.5	0	1.5	0.5	0.5
试样4	2.5	0.5	0.0	2.0	0.5	0.5	1.5	1.0	0.5	1.0	0.5	0.5
注：末端电磁搅拌制度Ⅰ指350 A、4 Hz;Ⅱ指350 A、8 Hz;Ⅲ指350 A、12 Hz。

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