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Liaoning Panjin 201 stainless steel plate thickness national standard industry strategic opportunity

发布时间: 2019-12-29 17:36:01 发布人: 谢经理 字体大小: 【大】 【中】 【小】 Article source: hpcsyjszp Release time: 2019-12-29 17:36:01 Posted by: Manager Xie Font size: [Big] [Medium] [Small]

<p> Liaoning Panjin 201 Stainless Steel Plate Thickness National Standard Industry Strategic Opportunity () Steel is operating at a low level. 1-2013, the overall performance of the domestic steel market was sluggish. With the substantial release of crude steel production capacity, the market supply and demand has fallen into an imbalance state, and steel has entered a declining channel and has fallen weakly for more than 4 months. As of July 26, 2013, the steel index had fallen to a point, which was lower than the 6:00 at the beginning of the year. The steel materials that the Iron and Steel Industry Association focused on have all declined to varying degrees from the beginning of the year, with an average decline of 7%. In terms of different types, construction wire and rebar, which account for a large proportion of steel production, fell 9% and 7%, respectively, and plate and hot rolled coils fell 7% and 7% respectively. Inspection method The establishment of continuous cooling isothermal transition curve in Panjin, Liaoning. The isothermal transition curve can be established by metallographic method, method, resistance method and thermal analysis method. The cooling media commonly used in quality inspection reports are: oil, water, brine, etc., and their cooling capacity increases accordingly. Reasons for the formation of high-quality Yuncheng When the alloy is solidified, the phenomenon of selective crystallization (also known as desolvation or liquid precipitation) occurs due to the different solubility of the solute in the solid phase and in the liquid phase. That is, with the progress of crystallization, solutes continue to precipitate at the solidification front (when K <1), so that the concentration of the same solute in the liquid gradually increases. During equilibrium crystallization, the uniform diffusion of the solute in the solid and liquid phases can be fully carried out, so no segregation occurs. However, in the actual solidification process of molten steel, in the specifications and thickness table of the Panjin stainless steel plate in Liaoning, the diffusion of the solute in the two phases, especially in the solid phase, cannot be fully performed. As a result, the precipitated solute is continuously enriched in the mother liquor at the solidification front, forming a solute segregation layer with a high concentration. The liquidus temperature of the melt in this segregation layer is lower than the liquidus temperature of the mother liquor with unchanged composition. This reduces the subcooling of the melt at the solidification front. This phenomenon has a great effect on solidification. In extreme cases (solid phase heterogeneity, liquid phase non-mixing), a large solute enrichment occurs at the solidification front. The solute distribution can be described by the following formula: where CL (x) is the solute concentration in the liquid phase at x from the solidification front; C0 is the initial concentration of the solute in the alloy melt; K is the equilibrium distribution coefficient of the solute, K = C0 / CL conductance; R is the crystallization rate; DL is the diffusion coefficient of the solute in the liquid phase. Let K be a constant (liquid and solid phase lines are straight lines) and the liquidus slope is m, then the liquidus temperature distribution corresponding to the solute concentration at the solidification front can be used t L (x) = t0-mC L (x) = t0-mC0 (1 + 1-k / ke -R / DLx) to describe. The changes in CL (x) and t L (x) are shown in Figure 2. It can be seen that CL (x) decreases with increasing distance from the solidification front, and t L (x) increases with increasing distance from the solidification front. At the solidification front (x = O). The difference between the melting line temperature tL and the actual temperature of the melt is called supercooling, that is, Δt = tL-te. When the steady-state crystallization is reached, tL = te = ts at the solidification front. At this time, the area (2 shaded area) enclosed by the liquidus temperature distribution curve and the actual temperature distribution curve is called the supercooled zone. The emergence of composition undercooling will definitely stop the further advancement of the original solidification interface, and when the subcooling in the front of its solidification front is larger than the subcooling degree Δt 所需 required for nucleation, it will form in front of the solidification interface New crystal nuclei. This is a convincing explanation for the transformation of steel ingot crystals from columnar crystals to equiaxed crystals. Inspection conclusions With the development of science and technology and industry, the performance of alloy steel has put forward higher requirements on materials, such as higher strength, resistance to high temperature, high pressure, low temperature, corrosion resistance, wear and other special physical and chemical properties. , Liaoning Panjin stainless steel plate wall thickness comparison table, Liaoning Panjin stainless steel plate wholesale, carbon steel can not fully meet the requirements. Liaoning Panjin 201 Stainless Steel Plate Thickness National Standard Standard Industry Strategic Opportunity Effect of Alloying Elements on the Plastic Workability of Steel Plastic working is divided into hot working and cold working. Dissolving alloying elements in solid solution or forming carbides (such as Cr, Mo, W, etc.), all can increase the steel's resistance to thermal deformation and significantly reduce its thermoplasticity, making it easy to forge and crack. The hot-working performance of general alloy steel is much worse than that of carbon steel. Statistics last week, Tangshan City Iron and Steel Industry's 2018 non-heating season off-peak production plan solicitation opinions draft, intends to implement the off-peak production for a total of 244 days from March 16, 2018 to November 14, 2018. These environmental protection policies indicate that the atmospheric emission regulations in 2018 will continue to tighten, and there will be a significant impact on the speed of steel mills' resumption of production after the year. Profession is king </ p> <p>

Liaoning Panjin 201 stainless steel plate thickness national standard industry strategic opportunity


</ p> <p> Liaoning Panjin 201 stainless steel plate thickness national standard industry strategic opportunities are different from ordinary steel traders. The main business is 10 # inclined leg channel steel, which is a special-shaped steel used in Zhijing coal mine. Now, as in previous years, he ordered 1,000 tons of goods from Baosteel Pudong Iron and Steel Co., Ltd. (formerly Iron and Steel Plant) and stored them in the warehouse. Except for Co and Al, most alloying elements decrease the Ms and Mf points. The order of its magnitude is: Mn, Cr, Ni, Mo, W, Si. Among them, Mn has a strong effect, and Si has virtually no effect. The decrease of Ms and Mf points increases the amount of retained austenite in the steel after quenching. When the amount of retained austenite is too large, cold treatment can be performed (cold to below the Mf point), the cause of secondary hardening of alloying elements, transformation of residual austenite, precipitation hardening of Mn, Mo, W, Cr, Ni, Co, VV, Mo, W, Cr, Ni, and Co are only effective at high levels and the presence of other alloying elements, as they can produce interstitial compounds with a diffuse distribution. The classification and symbols of galvanized steel sheet and steel strip are shown in the following table: Classification category symbol According to processing performance General purpose PT mechanical occlusion JY deep drawing SC ultra deep drawing anti-aging CS structure JG according to zinc layer weight zinc zinc iron alloy 0010019090120120180180 according to surface structure normal zinc Flower Z small zinc flower X-ray finishing zinc flower GZ zinc iron alloy XT according to surface quality Ⅰ group Ⅰ Ⅱ group Ⅱ according to dimensional accuracy advanced accuracy A ordinary accuracy B according to surface treatment chromate passivation L oil Y chromate passivation plus oil LY001 No. zinc layer weight is less than 100g / m2. Effect of alloying elements on the heat treatment process performance of steel The heat treatment process performance reflects the difficulty of heat treatment and the tendency of heat treatment to produce defects. It mainly includes hardenability, superheatability, tempering embrittlement tendency and oxidative decarburization tendency. Alloy steel has high hardenability. Slower cooling can be used during quenching, which can reduce the deformation and cracking tendency of the workpiece. Adding manganese and silicon will increase the superheatability of steel. The width of Liaoning Panjin sheet is 500-1500 mm; the width of the thickness is mm. Sheets can be divided into ordinary steel, high-quality steel, alloy steel, spring steel, stainless steel, tool steel, heat-resistant steel, bearing steel, silicon steel and industrial pure iron sheet according to steel grade; oil drum plate, enamel plate, anti-use plate, etc. Use level; according to the surface coating, there are galvanized sheet, tin plate, lead plate, plastic compound. Hexagonal steel plate and so on. Welcome to call us. The width of the plate is 500-1500 mm; the thickness of the thickness is mm. Sheets are classified by steel type, including ordinary steel, high-quality steel, alloy steel, spring steel, stainless steel, tool steel, heat-resistant steel, bearing steel, silicon steel, and industrial pure iron flakes. Carbon steel by chemical composition Carbon steel refers to iron-carbon alloys that contain a small amount of manganese, silicon, sulfur, phosphorus and other elements in addition to iron and carbon in the steel. According to their carbon content, they can be divided into: Low Carbon steel—carbon content wc≤0.25% medium carbon steel—carbon content wc 0.25% ~ 0.60% high carbon steel—carbon content wc> 0.60% high carbon steel is more in the military and industrial industries In order to improve the properties of steels, alloy steels are steels made by adding some alloying elements on the basis of smelting carbon steel, such as chromium steel, manganese steel, chromium-manganese steel, and chromium-nickel steel. According to the total content of alloy elements, it can be divided into: low alloy steel-total content of alloy elements ≤ 5%, medium alloy steel-total content of alloy elements 5% to 10%, high alloy steel-total content of alloy elements > 10% international numbers use international chemical element symbols and national symbols to indicate chemical composition, and use letters to indicate composition content: 、 Russian 12CrNi3A; Use fixed digits to indicate steel series or numbers: United States, Japan, 300 series, 400 series, 200 series; The serial numbers are composed of Latin letters and sequences, and only indicate the use. Quality inspection report Jiamusi pearlite body type transformation (high temperature transformation) Liaoning Panjin 201 stainless steel plate thickness national standard standard industry strategic opportunity The final performance of alloy quenched and tempered steel is determined by the tempering temperature. Tempering is generally used. Select the tempering temperature to obtain the required performance. To prevent the brittleness of the first type of tempering, rapid cooling (water-cooled or oil-cooled) after tempering is beneficial to the improvement of toughness. Marketing Department (Influence of alloying elements (such as 6-20))-Except for cobalt, all alloying elements will increase the stability of supercooled austenite A and shift the C curve to the right after dissolution into austenite. When there are more substances, it also affects the shape of the curve. Sampling </ p> <p>

Liaoning Panjin 201 stainless steel plate thickness national standard industry strategic opportunity


</ p> <p> Liaoning Panjin 201 stainless steel plate thickness national standard industry strategic opportunity to add manganese-based alloy elements. High-speed installation and growth-Martensite grows extremely fast, and collisions between pieces easily cause microcracks in the martensite pieces. For quality improvement, let Ps be the external force at the yield point s, and Fo be the cross-sectional area of the sample. Then the yield point σs = Ps / Fo (MPa). Pa: Pascal = N / m Channel steel and angle steel Channel steel and angle steel are dissolved in iron. Almost all alloying elements (except Pb) can be dissolved in iron to form alloy ferrite or alloy austenite. The effect of α-Fe or γ-Fe can be divided into two categories: expanding austenite phase region and reducing austenite phase region. Poor tempering stability. Due to poor tempering stability, carbon steel is undergoing quenching and tempering. In order to ensure higher strength, a lower tempering temperature is required during processing, so that the toughness of the steel is lower; in order to ensure better toughness, the strength is lower when using a high tempering temperature, so the synthesis of carbon steel The mechanical performance level is not high. The solution is customized SPCE SPCE——refers to cold-rolled carbon steel sheet and steel strip for deep drawing, which is equivalent to 08Al (521 deep-drawn steel). To ensure that it is not timely, add N as the spcen at the end of the brand. Cold rolling Carbon steel plate and strip quenching code: Annealed state A, standard quenched and tempered S, 1/8 hard 1/4 hard 1/2 hard 1. Surface processing generation : D is matte finish rolling, B is bright finish rolling. SPCC-SD stands for standard quenched and tempered ordinary cold rolled carbon sheet. Another example is spcct-sb, which means standard quenching and brightening, and It is necessary to ensure the cold-rolled carbon sheet with mechanical properties. Have good heat treatment process performance. At high carburizing temperature, austenite grains are not easy to grow, and have good hardenability. Features Low carbon: carbon content is generally , So that the core of the part has sufficient plasticity and toughness. </ P>