Due to the characteristics of stainless steel and the special requirements for product quality, the stainless steel cold rolling production process has the following characteristics: (1) Stainless steel is a kind of high alloy steel, which has a large resistance to rolling deformation. In order to carry out high-efficiency and high-precision rolling, a rolling mill with high rigidity should be used, and a multi-roll cold rolling mill is generally used. (2) The multi-roll cold rolling mill generally adopts the single-machine reversible rolling method. The head and tail parts wound on the coiler during rolling are not rolled and are cut off to become waste. In order to improve the yield of the product, a section of lead strip should be welded at both ends of the stainless steel strip before rolling, and the lead strip part should not be rolled; in addition, if the quality of the hot-rolled coil is too small, in order to improve the rolling efficiency and yield; The small steel coils are pre-welded into large steel coils; in the continuous annealing and pickling unit, because of the continuous operation, the head and tail connections of the steel strips also need to be welded. (3) Before the...
Stainless steel coloring methods are as follows: ⑴ chemical oxidation coloring method; (2) Electrochemical oxidation coloring method; (3) Ion deposition oxide coloring method; ⑷ high temperature oxidation coloring method; ⑸ gas-phase cracking coloring method. A brief overview of the various methods is as follows: (1) Chemical oxidation coloring method: It is the color of the film formed by chemical oxidation in a specific solution, including dichromate method, mixed sodium salt method, vulcanization method, acid oxidation method and alkaline oxidation method. Generally, “INCO” (INCO) is used more, but if you want to ensure the same color and luster of a batch of products, you must use a reference electrode to control. (2) Electrochemical coloring method: It is the color of the film formed by electrochemical oxidation in a specific solution. (3) Ion deposition oxide coloring method chemical method: the stainless steel workpiece is placed in a vacuum coating machine for vacuum evaporation plating. For example: titanium-plated watch cases and watch straps are generally golden yellow. This method is suitable for high-volume stainless steel machining. Because of the large investment and high cost, small batch products are not cost-effective. ⑷ High temperature oxidation coloring method: In a specific molten salt, the workpiece...
First of all, what stainless steel processing enterprises should do is to have a thorough understanding of the national environmental protection law and other relevant laws and regulations, and combine their own actual conditions to formulate strategies and plans for the next development of the enterprise. Some small and medium-sized stainless steel enterprises need to improve equipment level and environmental protection requirements in terms of scale and processing technology. Enterprises should also encourage scientific researchers to continuously develop stainless steel environmental protection technology and develop multi-functional intelligent products. If their technical capabilities are limited, they can introduce new systems and new technologies for environmental protection pickling, electroplating and waste recycling, and rely on “refined” management to reduce costs. The road of innovation, intensiveness and environmental protection, so as to obtain more benefits and reduce environmental pollution as much as possible. In particular, enterprises need to transform dust removal, purification, sewage treatment, and cleaning equipment, and must meet new environmental protection policies and new emission standards, so that even if the environmental protection storm is fierce, the enterprise can still stand tall! Although the investment cost of environmental protection equipment is large, and the cost of later maintenance and depreciation is...
1. Types and definitions of corrosion In many industrial applications, stainless steel can provide satisfactory corrosion resistance. According to the experience of use, in addition to mechanical failure, the corrosion of stainless steel is mainly manifested in: a serious form of corrosion of stainless steel is localized corrosion (ie stress corrosion cracking, pitting corrosion, intergranular corrosion, corrosion fatigue and crevice corrosion) . The failure cases caused by these localized corrosion accounted for almost more than half of the failure cases. In fact, many failure accidents can be avoided through reasonable selection of materials. Stress Corrosion Cracking (SCC): A general term that refers to the mutual failure of stressed alloys in corrosive environments due to the expansion of strong lines. Stress corrosion cracking has a brittle fracture morphology, but it can also occur in highly ductile materials. The necessary conditions for stress corrosion cracking to occur are the presence of tensile stress (whether residual stress or applied stress, or both) and a specific corrosive medium. The formation and expansion of the profile is approximately perpendicular to the direction of the tensile stress. The stress value that causes stress corrosion cracking is much smaller than the stress value required to fracture the...
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