38MnVS6非调质钢中硫化物碲改质工业实践

刘增平; 李杰; 沈伟; 付建勋

doi:10.7513/j.issn.1004-7638.2023.02.029

38MnVS6非调质钢中硫化物碲改质工业实践

doi: 10.7513/j.issn.1004-7638.2023.02.029

刘增平^1,,
李杰²,
沈伟²,
付建勋^2, ,

1.
承德建龙特殊钢有限公司, 河北省半钢水冶炼高洁净高品质特殊钢重点实验室, 河北承德 067201
2.
上海大学材料科学与工程学院先进凝固技术中心, 省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444

基金项目: 国家自然科学基金资助项目（51874195，51671124）；广东省科技专项：〔2020〕43 号

详细信息

作者简介:
刘增平，1979出生，男，工程师，研究方向为汽车用钢产品开发与质量提升，E-mail: liuzengping@ejianlong.com

通讯作者:
付建勋，1969年出生，男，博士、教授，研究方向为高品质特殊钢开发与品质提升，E-mail: fujianxun@shu.edu.cn

中图分类号: TF76
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- 被引次数: 0
出版历程
- 收稿日期: 2022-01-24
- 刊出日期: 2023-04-30

Industrial practice of tellurium modified sulfides in the non-quenched and tempered 38MnVS6 steels

Liu Zengping^1
,,
Li Jie²,
Shen Wei²,
Fu Jianxun^{2
, ,}

1.
Chengde Jianlong Special Steel Co., Ltd., Hebei Key Laboratory of Semi Molten Steel Smelting High Clean and High Quality Special Steel, Chengde 067201, Hebei, China
2.
Center for Advanced Solidification Technology (CAST), School of Materials Science and Engineering, Shanghai University, State Key Laboratory of Advanced Special Steel, Shanghai 200444, China

摘要

摘要: 分析了未改质和改质后的38MnVS6钢中硫化物形态及评级，研究了碲对钢中硫化物二维及三维形貌的影响；通过对成品棒材力学性能的检测分析，研究了碲对38MnVS6非调质钢力学性能的影响。结果表明：碲改质过后钢中硫化物评级从细系3.0级，粗系2.0级下降为细系2.0级，粗系1.5级，法标评级由F级改质为C级；碲改质后钢中90%左右的硫化物长宽比控制在6以内，50%以上控制在1~3，未改质钢中硫化物大多数为长条状，改质过后以断续状和椭球状为主；改质过后38MnVS6非调质钢的屈服强度、抗拉强度、断后伸长率、断面收缩率等力学性能指标均符合技术要求。
- 38MnVS6 /
- 碲改质 /
- 硫化物 /
- 力学性能
Abstract: The morphology and rating of sulfide in the unmodified and modified 38MnVS6 steels were analyzed by means of metallographic microscope, scanning electron microscope and electrolytic etching. The effect of tellurium on the two-dimensional and three-dimensional morphology of sulfides in the steels was studied. The effect of tellurium on the mechanical properties of the non-quenched and tempered 38MnVS6 steels was studied by testing and analyzing the mechanical properties of the finished bars. The results show that after tellurium modification, the sulfide rating in the steel decreases from fine system 3.0 and coarse system 2.0 to fine system 2.0 and coarse system 1.5. The standard rating is changed from F to C. The aspect ratio of about 90% sulfides in the tellurium modified steels is controlled within 6, and more than 50% is controlled between 1 and 3. Most sulfides in the unmodified steels have the appearance of long strips, which were mainly changed to intermittent and ellipsoid after modification. After modification, the yield strength, the tensile strength, the fracture elongation, the reduction of area and other mechanical properties of the non-quenched and tempered 38MnVS6 steels meet the technical requirements.
- 38MnVS6 /
- tellurium modification /
- sulfide /
- mechanical properties

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图 1 棒材实物及取样示意

Figure 1. Bar materials and sampling diagram

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图 2 未改质与改质后38MnVS6钢金相照片

(a)～(c)未改质；(d)～(f)改质

Figure 2. Metallographic photos of the non-modified and modified 38MnVS6 steel

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图 3 未改质与改质后38MnVS6钢的黑白照片

(a)～(c)未改质；(d)～(f)改质

Figure 3. Black and white photography of the non-modified and modified 38MnVS6 steel

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图 4 法标NF A-04-108夹杂物评级图谱^[15]

Figure 4. France NF A 04-108 sulfide evaluation map

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图 5 未改质与改质后38MnVS6钢SEM照片

(a) 二维，未改质；(b)二维，改质；(c)三维，未改质；(d)三维，改质

Figure 5. SEM photos of the non-modified and modified 38MnVS6 steels

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表 1 38 MnVS6非调质钢的主要化学成分

Table 1. Main chemical composition of the non-quenched and tempered 38MnVS6 steel %

C	Si	Mn	P	S	N	V	Ni	Cr
0.37	0.57	1.42	0.01	0.054	0.016	0.13	0.03	0.17

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表 2 未改质与改质后38MnVS6钢中硫化物评级结果

Table 2. Sulfide rating results in the non-modified and modified 38MnVS6 steel

	硫化物长度/μm		评级		法标评级
	细系	粗系	细系	粗系	法标评级
未改质	1084.5	578.4	3.0	2.0	F
改质	576.6	423.4	2.0	1.5	C

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表 3 含碲38MnVS6钢非调质力学性能

Table 3. Mechanical properties of tellurium containing 38MnVS6 steels without quenching and tempering

	屈服强度R_p0.2/MPa	抗拉强度R_m/MPa	断后伸长率A/%	屈强比	纵向冲击吸收能量(KU₂)/J	表面硬度（HBW）
技术要求	≥590	≥800	≥12	0.65～0.75	≥10	≤296
改质材	610	866	22	0.7	15	247～254

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