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截重汽车的结构件如纵、横梁等,均采用冷冲压成型,要求钢板具有良好的综合性能。过去用的是进口料NSH52D和Q36及部分国产板。武钢一米七热连轧机组投产后,为了发挥新设备的优势,取代进口钢,试制符合我国资源的含钛控轧板T52L。自1979年7月试制以来,先后冶炼了二万余吨,冶炼钢锭合格率95.21％,初轧板坯合格率99.98％,热轧板一级品率95.93％,锭→材成材率75.05％, 通过二年来的试验工作,认为T52L钢具有以下优点: 1.良好的冷弯性能。 2.低的低温脆性转变温度(FATT),负60℃。 3.高的强度。 4.好的耐腐蚀性能。 6.焊接性能好。 T52L钢的主要弊病是性能波动范围大,不易控制,为了提高性能合格率,对炼钢轧钢工艺做了一系列的试验工作和数据分析,初步掌握了含钛钢的强化规律。 T52L钢曾先后在各汽车厂进行试验,效果良好,深受用户欢迎。
Truncated car parts such as longitudinal, beams, etc., are made of cold stamping, requiring steel with good overall performance. In the past is the use of imported materials NSH52D and Q36 and some domestic boards. Wuhan Iron and the seven meters hot rolling mill put into operation, in order to give play to the advantages of new equipment to replace imported steel, trial production of titanium-controlled rolling plate in line with China’s resources T52L. Since July 1979 trial production, has smelted more than 20,000 tons, smelting steel ingot pass rate of 95.21%, initial rolling slab pass rate of 99.98%, hot-rolled first grade product rate of 95.93%, ingot → wood finished rate of 75.05% Through two years of experimental work, that T52L steel has the following advantages: 1. Good cold bending performance. 2. Low low temperature brittle transition temperature (FATT), minus 60 ℃. 3. High strength. 4. Good corrosion resistance. 6. Welding performance is good. The main disadvantage of T52L steel is the wide range of performance fluctuation, which is not easy to control. In order to improve the passing rate of performance, a series of experimental work and data analysis have been done on the steel rolling process. The strengthening rules of titanium-containing steel have been initially mastered. T52L steel has been tested in the automobile plant, the effect is good, welcomed by users.