A low-carbon steel coil for an oil filter threaded cover plate and its manufacturing method

Abstract

The invention discloses a low-carbon steel coil for a threaded cover plate of an engine oil filter and a manufacturing method thereof. The chemical composition of the low-carbon steel coil is: C: 0.03-0.05%, Si≤0.040%, Mn: 0.30%~0.50%, P: ≤0.018%, S: ≤0.018%, Al: 0.028%~0.058%, Ti: 0.030%~0.060%, N: ≤0.0045%; heat the slab to ≥1190℃ , heating time ≥ 175min, soaking time ≥ 40min, and then rough rolling and finish rolling to obtain hot-rolled sheets, finishing rolling temperature 885-915 ℃, coiling temperature 580-640 ℃; final smoothing, pickling, its performance : Rel 280~330MPa, Rm 380~430MPa, A 50 ≥40%, grain size ≥9 and the difference between surface and thickness 1 / 2 ≤1. The low-carbon steel coil has higher strength, better ductility, uniform structure and performance, no cracking in the stamping and expansion flanging, and no burrs in the turning thread on the inner wall of the cap opening, which meets the needs of the oil filter to improve the pump pressure performance. Filter threaded cover anti-deformation requirements.

Description

technical field [0001] The invention relates to the technical field of metal material manufacturing, in particular to the technical field of hot-rolled steel strip manufacturing, in particular to a low-carbon steel coil for an oil filter threaded cover plate and a manufacturing method thereof. Background technique [0002] The oil filter is composed of a shell and a paper filter element, the paper filter element is inside the shell, and the shell is sealed with a threaded cover. The dirty oil pumped by the oil pump enters from 4 to 10 small holes reserved on the threaded cover plate, pushes the one-way valve at the opening of the oil filter and enters the periphery of the filter element, and after being filtered by the filter element, the clean oil enters the middle of the filter element , and then discharged from the oil outlet in the middle of the threaded cover plate to lubricate each movement pair of the car. The oil filter is mainly used to remove impurities such as du...

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Problems solved by technology

The existing materials mainly use SPHC low-carbon steel coils. In order to ensure good ductility and plasticity to avoid stamping cracks, generally C: 0.02-0.06%, Si≤0.045%, Mn: 0.10%-0.20%, P: ≤0.020%, S : ≤0.020%, Al: 0.025%~0.060%, N: ≤0.0050%, the rest is Fe and other unavoidable impurities, due to the low carbon manganese equivalent, no V, Nb, Ti microalloying elements, no effective The process control means, tensile strength ≤ 360MPa, when the oil filtration effect is improved, and the pump pressure > 1.6MPa, the existing threaded cover plate is not strong enough, easy to deform and arch, and the pressure bearing of the threaded cover plate of the oil filter Performance can only be achieved by using thicker SPHC low-carbon steel coils to avoid compression and deformation, which is not in line with the development direction of automobile lightweight and energy saving

[0004] If the existing SPHC low-carbon steel coil is strengthened by C and Mn alloys to achieve the required strength of the threaded cover plate, the cost of the alloy is high, and the toughness and plasticity are poor. The edge of the cap mouth is prone to cracking, and the turning thread on the inner wall of the cap mouth is prone to burrs. Although the strength can meet the requirements, it is not suitable for the threaded cover plate of the oil filter.

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