Thin gauge wear-resistant steel sheet and method of manufacturing the same
AssigneeSouth China University of Technology
InventorsLiejun Li, Feng Zhou, Jixiang Gao, Zhengwu Peng, Haibo Sun, Jietao Dai, Yanjun Lu
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Abstract
A thin gauge wear-resistant steel sheet, including the following chemical elements expressed in percentage by weight: 0.15-0.20 wt. % of carbon; 1.2-1.8 wt. % of manganese; 0.1-0.40 wt. % of copper; 0.15-0.30 wt. % of molybdenum; 0.20-0.40 wt. % of chromium; 0.03-0.06 wt. % of niobium; 0.01-0.03 wt. % of titanium; 0.0006-0.0015 wt. % boron; less than 0.015 wt. % of phosphorus; less than 0.010 wt. % of sulphur; and the balance being ferrum and unavoidable impurities, wherein the thickness of the steel sheet is in a range of 3.0 to 8 mm.
Claims7
A method of manufacturing a steel sheet, comprising steps of:
- S1, performing hot metal desulfurization and converter smelting and controlling a content of sulphur in a hot metal to be not less than or equal to 0.0030%, and a thickness of a slag layer to be not less than or equal to 50 mm in the hot metal;
- S2, performing converter tapping, and performing deoxidation and alloying using a ferrosilicon or silicon manganese alloy;
- S3, performing deoxidation and alloying by RH vacuum degassing refining;
- S4, performing ladle furnace refining, adding an aluminum wire and adding a titanium wire or a titanium alloy before exiting for microalloying of boron;
- S5, performing continuous casting and using a ladle shroud protective casting with argon seal, with a superheat degree being controlled between 15-30° C., to obtain a continuous casting slab with a thickness in a range of 55-70 mm, wherein a speed of the continuous casting is controlled in a range of 3.0-3.5 m/min;
- S6, heating the continuous casting slab in a heating furnace to remove phosphorus at a high-pressure greater than 16 MPa, wherein a temperature of the continuous casting slab entering the heating furnace is greater than or equal to 850° C., the heating time is controlled to be greater than or equal to 60 min, a heating temperature is in a range of 1050-1150° C., and a temperature of exiting the heating furnace is greater than or equal to 1000° C.;
- S7, performing continuous hot rolling and rolling 5-7 times, wherein an outlet temperature of finishing rolling is in a range of 860 to 920° C., and an outlet thickness is in a range of 3.0-8.0 mm;
- and
- S8, performing quenching treatment to the steel sheet after rolling, and controlling a cooling rate to be in a range of 40−120° C./s, wherein a termination temperature of quenching is in a range of 300-400° C.;
- and maintaining the termination temperature of quenching for 6 to 10 hours.
Dependencies are inferred from the claim text.