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A production process, cold-drawn technology, applied in the direction of metal material coating process, etc., can solve the problem of easy rust of cold-drawn steel
Inactive Publication Date: 2021-07-27
嵊州市裕盈金属冷拉型材有限公司
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[0004] But, when carrying out phosphating and saponification to the steel billet after alkali cleaning, the phosphating solution composition of this manufacturing method is zinc dihydrogen phosphate, it is difficult to form excellent phosphate film on the steel billet surface after alkali cleaning, causes the cold The drawn steel is easy to rust and needs to be improved
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preparation example Construction
[0049] A preparation method of phosphating solution, comprising the steps of:
[0050] Obtain zinc dihydrogen phosphate, zinc nitrate, permanganate, chlorate, organic accelerator, complexing agent, film-forming aid, emulsifier and water according to the proportion and mix them evenly.
Embodiment 6
[0053] A production process of cold-drawn section steel, comprising the steps of:
[0054] Step 1: grinding away the decarburized layer of the billet with decarburized surface;
[0055] Step 2: Alkali washing the billet after removing the decarburized layer to remove oil stains and abrasive dust on the surface of the billet;
[0056] Step 3: washing, phosphating, saponifying and drying the alkali-washed billets in sequence;
[0057] Step 4: Carry out sharpening, drawing, annealing and straightening on the dried billet in sequence.
[0058] Wherein, phosphating comprises the steps:
[0059] At 20° C., the washed steel slab was immersed in the phosphating solution prepared according to Example 1 for 10 minutes, then taken out to dry naturally, and then washed with water.
Embodiment 7
[0061] The difference between embodiment 7 and embodiment 6 lies in phosphating.
[0062] In embodiment 7, phosphating comprises the steps:
[0063] At 25° C., the washed steel slab was immersed in the phosphating solution prepared according to Example 2 for 10 minutes, then taken out to dry naturally, and then washed with water.
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Abstract
The invention discloses a production process of cold-drawn section steel. The production process comprises the following steps of step 1, grinding and removing a decarburized layer of a steel billet of which the surface is decarburized; step 2, alkali washing is conducted on the steel billet with the decarburized layer removed so as to remove oil stains and abrasive dust powder on the surface of the steel billet; step 3, the steel billet subjected to alkali washing is sequentially subjected to water washing, phosphorization, saponification and drying; and step 4, the dried steel billet is sequentially subjected to pointing, drawing, annealing and straightening. A phosphating solution used in the phosphating process comprises, by weight, 50-70 g / L of zinc dihydrogen phosphate, 70-90 g / L of zinc nitrate, 45-55 g / L of permanganate, 0.5-1.5 g / L of chlorate, 3-6 g / L of organic accelerant, 1-3 g / L of complexing agent, 1-2 g / L of coalescing agent, 1-3 ml / L of emulsifying agent and the balance water. The production process has the beneficial effect that the cold-drawn section steel produced by the production process has excellent corrosion resistance.
Description
technical field [0001] The invention relates to steel products, in particular to a production process of cold-drawn section steel. Background technique [0002] Cold-drawn steel is cold-drawn steel of various cross-sectional shapes and sizes, which can be divided into cold-drawn round steel, cold-drawn square steel, cold-drawn flat steel, cold-drawn hexagonal steel, cold-drawn special-shaped steel, etc. When producing cold-drawn steel, it is generally necessary to pickle the billet with sulfuric acid to remove the oxide layer on the surface of the billet. In this way, not only is it easy to cause the steel billet to be corroded, but it will also pollute the environment. [0003] Publication number is that the Chinese patent of CN111672927A discloses a kind of manufacturing method of the cold-drawn special steel round steel without decarburization layer on the surface. The manufacturing method comprises the following steps: (1) inspecting the steel billet before cold drawin...
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