Effect of Al<sub>2</sub>O<sub>3</sub> in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Li, Shujun; Du, Xueyan

doi:10.1590/1980-5373-MR-2021-0556

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Article • Mat. Res. 25 • 2022 • https://doi.org/10.1590/1980-5373-MR-2021-0556 copy

Effect of Al₂O₃ in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The influence of Al₂O₃ content in refining slag on the cleanliness and fatigue property of ultra-low-carbon (ULC) automotive steel were investigated based on the industrial experiments. The inclusion-adsorption capacity of the refining slag was calculated and the total [O] (T.O) content of ULC automotive steel was measured. The number density, size distribution and morphology of inclusions were analyzed and their effects on the cleanliness and fatigue property of ultra-low-carbon (ULC) automotive steel were investigated. The results showed that as the Al₂O₃ content in refining slag increased from 19.92% to 39.73%, the inclusion-adsorption capacity of ULC automotive steel decreased from 210.30 down to 57.12, and the fatigue life from 1.4x10⁴ down to 0.9x10⁴ cycles, while the T.O content of steel increased from 12 up to18 ppm and the inclusion number density from 4 up to 9 per mm².

Keywords:
refining slag; adsorption capacity; cleanliness; fatigue property; UCL automotive steel

Sample Nr.	TFe	MnO	CaO	SiO₂	Al₂O₃	MgO	R₂(CaO/ SiO₂)	CaO/Al₂O₃
1	18.22	3.35	45.13	13.71	1.27	8.31	3.29	35.54
2	20.36	3.93	44.36	12.47	1.39	8.74	3.56	31.91
3	19.6	2.71	46.5	12.52	1.3	10.07	3.72	35.77
4	21.65	2.63	41.68	13.56	1.58	9.7	3.07	26.38
5	18.78	2.71	47.57	13.11	1.11	8.89	3.63	42.86

Sample Nr.	TFe	MnO	CaO	SiO₂	Al₂O₃	MgO	R₂(CaO/ SiO₂)	CaO/Al₂O₃
6	0.39	0.148	57.05	5.08	19.92	8.8	11.23	2.86
7	0.33	0.172	53.86	6.56	24.86	8.22	8.21	2.17
8	0.35	0.191	52.39	6.96	30.08	6.86	7.53	1.74
9	0.46	0.065	50.34	7.29	34.86	6.79	6.91	1.44
10	0.39	0.097	45.58	7.89	39.73	6.17	5.78	1.15

Sample	C	Mn	S	P	Si	Als	N
1	0.031	0.042	0.007	0.01	0.003	0.001	0.002
2	0.023	0.041	0.005	0.01	0.003	0.003	0.0019
3	0.024	0.038	0.006	0.011	0.003	0.001	0.0025
4	0.025	0.035	0.006	0.01	0.002	0.002	0.0021
5	0.023	0.036	0.006	0.008	0.003	0.001	0.0023

Sample Nr.	scanning area/mm²	Inclusion number	maximum size/um	minimum size/um	number density #/mm²
1	50.81	207	13.83	1.08	4.07
2	53.06	277	15.2	1.05	5.22
3	51.5	267	16.82	1.08	5.18
4	55.14	336	21.2	1.05	6.09
5	52.54	476	45.49	1.05	9.06

Sample Nr.	Sizes/um	Main types of inclusions
1	2-4	Small spherical Al₂O₃
	4-10	Spherical Al₂O₃
	>10	——
2	2-4	Small spherical Al₂O₃
	4-10	Spherical Al₂O₃
	>10	Al₂O₃· CaO cluster + Al₂O₃ cluster
3	2-4	Small spherical Al₂O₃
	4-10	Al₂O₃ cluster + spherical Al₂O₃
	>10	Al₂O₃·CaO·SiO₂ cluster + Al₂O₃ cluster
4	2-4	Small spherical Al₂O₃
	4-10	Al₂O₃ cluster + spherical Al₂O₃
	>10	Al₂O₃·CaO·SiO₂cluster + Al₂O₃cluster + spherical Al₂O₃
5	2-4	Small spherical Al₂O₃
	4-10	Al₂O₃ cluster + spherical Al₂O₃
	>10	Al₂O₃·CaO·SiO₂ cluster + Al₂O₃cluster + large spherical Al₂O₃

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Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Abstract

Effect of Al₂O₃ in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel