A method for producing low-consumption corrosion-resistant cold-rolled products

Abstract

The invention relates to a production method of a low-consumption corrosion-resistant cold-rolled product. The method specifically includes the following steps: uncoiling via an uncoiler; breaking and stripping oxides on the surface of strip steel via a leveler; further breaking and stripping the oxides on the surface of the strip steel via a multi-roll straightener; removing the shed and loose oxides of the surface of the strip steel via a scrubbing device; subjecting the treated strip steel to acid pickling and rinsing; removing surface residues of the strip steel mechanically; then subjecting the strip steel to cold rolling; recoiling via a recoiler. Through the method, the surface oxides of the strip steel have more cracks and are large in clearance, and efficiency of acid pickling is improved; part of the oxides is removed while scale breaking, reacting dose of acid pickling is decreased, and acid consumption is lowered; the added value of yield strength of the strip steel after scale breaking is lowered, and convenience is brought to subsequent cold rolling; the strip steel is subjected to leveling prior to cold rolling, so that profile precision of the finished product is improved; chloride ion residues on the surface of the product are decreased, and corrosion resistance of the product is enhanced.

Description

technical field [0001] The invention belongs to the field of deep processing of ordinary hot-rolled flat materials, and in particular relates to a production method of low-consumption corrosion-resistant cold-rolled products. Background technique [0002] The combined pickling and rolling mill of the prior art has the following salient features: the entrance is equipped with a tension-leveler 3 for mechanical phosphorus removal, and the strip 7 after phosphorus removal is pickled 4 and rinsed for 30 to become a hot-rolled pickled product. [0003] Such as figure 1 As shown, this production process has the following defects: it is composed of uncoiler 1, inlet looper 2, tension leveler 3, pickling 4, rinse 30, outlet looper 5, continuous rolling mill 23 and coiler 6, and the inlet configuration The tension leveler 3 performs mechanical phosphorus removal, and the strip steel 7 after phosphorus removal is pickled 4 and rinsed for 30 to become a hot-rolled pickling product. A ...

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Problems solved by technology

[0003] like figure 1 As shown, this production process has the following defects: it is composed of uncoiler 1, inlet looper 2, tension leveler 3, pickling 4, rinse 30, outlet looper 5, continuous rolling mill 23 and coiler 6, and the inlet configuration The tension leveler 3 performs mechanical phosphorus removal, and the strip steel 7 after phosphorus removal is pickled 4 and rinsed for 30 to become a hot-rolled pickling product. A continuous rolling mill 23 is installed at the outlet of the unit. The unsatisfactory effect of phosphorus removal leads to low efficiency of pickling 4 ; After pickling 4, the acid solution remains seriously, and the residual acid enters the rolling mill to pollute the emulsion and reduce the corrosion resistance of the product

[0006] In order to reduce acid residue, the strip steel 7 is traditionally cleaned by multi-stage rinsing 30 , and the temperature of rinsing 30 is continuously raised during the rinsing 30 , increasing the kinetic energy of molecules in the rinsing 30 tank, and accelerating the diffusion of acid solution. Generally, the last stage rinsing 30 The rinsing temperature is about 85°C, which increases the energy consumption of the production process. Even so, from the actual production situation, the acid concentration in the final rinse 30 tank is still 100mg / l-150mg / l

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