New market opportunities for stainless steel strip
With the rapid development and transformation of communication, electronics, and office automation equipment, users areStainless steel stripThe requirements of stainless steel are also becoming stricter. Different from conventional stainless steel sheets, fine stainless steel strips usually refer to stainless steel strips with a thickness of less than 0.3mm. In order to eliminate the traces of the hot rolling process, austenite, austenite-ferrite and austenite- Martensitic hot-rolled strip steel must be quenched. In a general sense, it is understood that the products brought out are products that do not meet the order requirements or non-planned products that are incidentally produced by the steel mill in the process of producing according to the order or plan. They are also called non-planned products. When the thickness of the surfacing layer exceeds 5mm, it will cause welding bumps, and it is very easy to cause welding slag. A high-alloy steel that can resist corrosion in the air or in chemically corrosive media. It has a beautiful appearance and good corrosion resistance. It does not need to undergo surface treatment such as plating, but exerts its inherent appearance performance. It is used in various steels. One kind, usually called stainless steel. 304L stainless steel and 316L stainless steel have low carbon content. Because the carbon content is reduced, chromium carbide will not be produced, and intergranular corrosion will not be produced. , Due to the poor fluidity of molten steel, in order to avoid cold barriers and lack of pouring of steel castings, the wall thickness of steel castings should not be less than 8mm; the structure of the gating system should be simple and the cross-sectional dimension of the cast iron should be larger; Hot casting mold: Properly increase the pouring temperature, generally 1520°～1600°C, because the pouring temperature is high, the molten steel has a high degree of overheating, and the fluidity can be improved for a long time. However, if the pouring temperature is too high, it will cause defects such as coarse grains, thermal cracks, pores and sand sticking. , In addition, since the delivery is made of steel coils, the inner and outer diameters of the steel coils, the weight of the packing list and the packing method must also be communicated in advance.
The development of precision steel belts necessitates the adjustment of economic structure. With the rapid development of the stainless steel industry in China, from the perspective of conventional stainless steel products, it has entered a fairly mature stage. It is the current bottleneck in the development of conventional stainless steel materials that makes Shenzhen Yitian Metals due to its high added value and current demand trends. Such reasons have become the focus of attention in the industry, prompting many cold rolling and rolling enterprises that do not have the production capacity and technical equipment in this field to join the ranks of precision. In order to reduce the internal stress after the cold treatment, tempering (or aging) is performed at a temperature of 350 to 500°C. Permeability Austenitic stainless steel has very small permeability, so it is also called a non-magnetic material. Steels with stable austenitic structure, such as 0 Cr 20 Ni 10, 0 Cr 25 Ni 20, etc., will not be magnetic even if they are processed with a large deformation greater than 80%. In addition, high-carbon, high-nitrogen, high-manganese austenitic stainless steels, such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N series and high-manganese austenitic stainless steels, will undergo ε phase transformation under high-reduction processing conditions, so they remain non-magnetic. At present, the main production processes of precision stainless steel strip include cold rolling, bright annealing, finishing and so on. In order to eliminate the traces of the hot rolling process, austenite, austenite-ferrite and austenite-martensitic hot-rolled strip steel must be quenched.
Take Yucai as an example. This part of the products that cannot be delivered to the planned order can only be sold as a spot. If the stock market is rising, this part of the inventory can also increase in value. On the contrary, when the price is depreciated, this part of the extra products will also exist. The danger of depreciation depends on the specific market conditions. Another key issue in the heat treatment of cold-rolled stainless steel strip is that the entire strip is required to be evenly arranged in width and length. Microscopic shortcomings (slag inclusions often appear in the form of interpasses, and sometimes interlayer slag inclusions. The main cause of slag inclusions in the weld bead is the poor process performance of the flux, which makes the wetting angle on both sides of the weld bead of the deposited metal Too steep, resulting in poor marginal fusion, and slag inclusion between passes is likely to occur when a weld bead is surfacing. In addition, unqualified welding specifications and welding orientations are also likely to cause such shortcomings.
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