Method for eliminating rapid tensile strain marks of cold-rolled sheet for stamping
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A technology of tensile strain and cold-rolled sheet, which is applied in the production field of continuous annealed ultra-low carbon stamping steel cold-rolled sheet, which can solve problems such as tensile strain marks, grain growth, and large quality problems, and achieve good stamping processing Excellent performance, simple operation process, and stable product performance
Active Publication Date: 2021-11-19
安钢集团冷轧有限责任公司 +1
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When Angang cold rolling adopts ultra-low carbon steel components to produce 0.6mm~1.2mm, because the range of C content is not strictly controlled during composition smelting, the actual C control is 0.0058%, and the continuous annealing process of this batch of products is not well controlled. Stable, that is, the temperature in the heating section is 853°C, and the soaking section is 836°C. The heating temperature is too high, resulting in excessive growth of some grains. The yield platform was eliminated, but the product showed serious tensile strain marks within less than a week, causing users to have major quality problems during use and unable to meet user requirements
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Embodiment 1
[0024] The cold-rolled sheet DC03 for stamping adopts ultra-low carbon steel composition system: C 0.001%~0.004%, Si≤0.03%, Mn0.13%~0.2%, P≤0.015%, S≤0.020%, Al 0.03%~0.06 %, N≤0.004%, the rest is Fe and unavoidable impurities.
[0025] When producing 0.8mm stamping cold-rolled sheet DC03, the specific requirements for each process are as follows:
[0026] 1) Steelmaking, using a 150t oxygen top-bottom double-blown converter to smelt molten steel, using high-grade metallurgical lime and low-sulfur dolomite, and the lime composition is: SiO 2 1.01%, CaO 94.6%, MgO 1.7%, P 0.002%, S 0.025%, activity 378; dolomite composition: SiO 2 1.06%, CaO 54.5%, MgO 37.1%, P 0.01%, S 0.082%. During the blowing process, the slag is melted early and the slag is melted in the whole process. RH refining process: RH vacuum treatment time is 28 minutes, of which the net cycle time is 9 minutes; a sufficient amount of carbon-free covering agent is added after refining. The specific smelting co...
Embodiment 2
[0033] The cold-rolled sheet DC03 for stamping adopts ultra-low carbon steel composition system: C 0.001%~0.004%, Si≤0.03%, Mn0.13%~0.2%, P≤0.015%, S≤0.020%, Al 0.03%~0.06 %, N≤0.004%, the rest is Fe and unavoidable impurities.
[0034] When producing 1.2mm stamping cold-rolled sheet DC03, the specific requirements for each process are as follows:
[0035] 1) Steelmaking, using a 150t oxygen top-bottom double-blown converter to smelt molten steel, using high-grade metallurgical lime and low-sulfur dolomite, and the lime composition is: SiO 2 0.93%, CaO 93.4%, MgO 1.4%, P 0.002%, S 0.028%, activity 386; dolomite composition: SiO 20.97%, CaO 54.2%, MgO 36.9%, P 0.01%, S 0.079%. During the blowing process, the slag is melted early and the slag is melted in the whole process. RH refining process: RH vacuum treatment time is 29 minutes, of which the net cycle time is 8 minutes; a sufficient amount of carbon-free covering agent is added after refining. The specific smelting com...
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Abstract
The invention provides a method for eliminating rapid tensile strain marks of a cold-rolled sheet for stamping, which comprises the following steps of: steelmaking: smelting into molten steel by adopting a 150t oxygen top-bottom combined blown converter; RH refining, wherein the RH vacuum treatment time is not shorter than 25 min; continuous casting is conducted, and whole-course protection casting is adopted; the thickness of a continuous casting slab is 210 mm or 230 mm, and the pulling speed of a slab is 0.9-1.1 m/min; hot continuous rolling is carried out, the heating temperature of the slab is 1200-1230 DEG C, the finish rolling temperature is 890-910 DEG C, and the coiling temperature is 680-700 DEG C; the cold rolling production process comprises the following steps: continuous rolling is conducted by 5 racks, wherein the cold rolling reduction rate is 80-87%; a continuous annealing production process is carried out: the temperature of a heating section is 820 +/-5 DEG C, the temperature of a soaking section is 820 +/-5 DEG C, the temperature of a slow cooling section is 660 +/-10 DEG C, the temperature of a rapid cooling section is 420 +/-10 DEG C, the temperature of an overaging section is 400 +/-10 DEG C, the time of the overaging section is not less than 200 s, and the flattening elongation is 0.8-1.6%; and the metallographic structure of a cold-rolled sheet DC03 for stamping is ferrite and cementite. By means of the method, the cold-rolled sheet DC03 for stamping can be produced from ultra-low carbon steel components, and the method is simple in operation process, stable in product performance and good in stamping machining performance.
Description
technical field [0001] The invention relates to the technical field of continuous annealing ultra-low carbon steel cold-rolled sheet for stamping, and mainly relates to a method for eliminating the rapid occurrence of tensile strain marks on the cold-rolled sheet for stamping. Background technique [0002] Cold-rolled sheet DC03 for stamping has a wide range of applications, and is often used in the automotive industry, home appliance industry, and door industry. Users have high requirements for product quality, not only requiring better stamping performance, but also higher surface quality. At present, the cold-rolled sheet DC03 for stamping often adopts two component systems, that is, one is a micro-carbon steel component, and the C content is 0.01%≤C≤0.03%, which is currently the component system adopted by most enterprises; the other is an ultra-low carbon steel component. Carbon steel composition, C content ≤ 0.01%, RH refining is required during smelting. The carbon co...
Claims
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