Different parts have different requirements for hardenability. If the spring requires hardening, the gear does not require hardening. F Brinell hardness (HB) b Xingtai City, Xingtai County, metal galvanized steel strip Product advantages: This metal design has strong adaptability, according to different appearance requirements, performance requirements and functional requirements can be designed to adapt to various types of color Decorative effect of composite wear-resistant steel sheet metal curtain wall. Special metal materials include stealth, hydrogen resistance, superconductivity, shape memory, wear resistance, vibration damping and other special functional alloys, as well as metal-based composite materials. Enhanced wear resistance and ductility. Vanadium is contained in many types of steel, of which M-Vascowear, CPM T440V and 420VA contain a large amount of vanadium. The big difference between BG-42 and ATS-34 is that the former contains vanadium. L Lincang 65Mn spring steel plate has increased significantly in many construction markets, resulting in steel products in major regions ranging from 10 yuan to more than 100 yuan. Then the market was pulled up in the end, but because of weak sales and falling billets , Merchants began to lower prices and sell goods late in the week. The price of steel is still relatively stable. Dp maintains strength, corrosion resistance, and toughness. Appears in L-6 \ AUS- AUS-8. It is how the steel industry enterprises implement the "go global" strategy. The iron and steel industry in the world must truly form several internationally competitive and internationally-operated enterprises, domestically-competitive enterprises with regional competitive advantages, and competitive main players in the field of chemical industry to achieve the integration of international and domestic markets. development of.
Steel plate for automobile beam: Capital letter l is used at the end of the brand, such as 06ti 08ti 10Ti 09siv 16Mn. w Performance requires high strength: generally its yield strength is above. O ☆ Any factor that shifts the C curve to the right will decrease the critical cooling rate. How much electric furnace steel is U: (a) electric arc furnace steel; (b) electroslag furnace steel; (c) induction furnace steel; (d) vacuum consumable furnace steel; (e) electron beam furnace steel. Overview of the heat treatment of steel The heat treatment of steel refers to a variety of processes that change the structure of the steel in the solid state by different heating, holding and cooling of the steel to obtain the required properties. The heat treatment route of steel is as follows: The heat treatment classification of steel is divided into overall heat treatment (annealing, normalizing, quenching, tempering) according to the process; surface heat treatment (flame heating surface quenching, induction heating surface quenching, laser heating surface quenching, etc.) ; Chemical heat treatment (carburizing, nitriding, other elements, etc.). eS temperature change formation-M can only continue the transformation under the condition of continuously decreasing temperature. Hardness-is the ability of foreign materials to penetrate. It is common to test the degree of hardness by filing on the edge of the workpiece, and the hardness of the hardness is determined by the depth of the scratches presented on the surface. This method, called the file test, is less scientific. The hardness tester is very accurate and is commonly used in modern hardness testing. The commonly used test method is the Rockwell hardness test. The Rockwell hardness tester measures the depth of the metal when it is punched into the metal. The greater the depth of the punch, the smaller the hardness. The depth of the diamond's penetration into the metal indicates the correct number from the pointer, which is called the Rockwell hardness value.
Malleability-also known as malleability, is another representation of ductility or ductility of metals. Spreadability is the property that the metal will not crack when deformed by hammer forging or rolling. Word-of-mouth recommendations: Carburizing steel, ammonia steel, surface hardening steel; free-cutting structural steel; cold plastic forming steel: including cold stamping steel and cold heading steel. Z heat treatment and performance of alloy carburizing steel heat treatment process are generally carburized directly after quenching, and then low temperature tempering. After heat treatment, the surface carburized layer is alloy cementite + tempered martensite + a small amount of retained austenite, and the hardness is 60HRC ~ 62HRC. The core is related to the hardenability of the steel and the cross-section size of the part. When fully hardened, it is low-carbon tempered martensite, with a hardness of 40HRC ~ 48HRC; in most cases, it is tempered martensite, tempered martensite, and a small amount of ferrite. Body, hardness is 25HRC ~ 40HRC. Heart toughness is generally higher than 700 / m2. Alloy quenched and tempered steel is widely used in various important parts on automobiles, tractors, machine tools and other machines, such as gears, shafts, connecting rods, bolts, etc. The difference in operation brings about the difference in operation due to the above reasons. Because of its simple temperature control, the NM500 composite wear-resistant steel plate electric furnace is particularly significant during the melting period, oxidation period, and recovery period, especially during the recovery period. This is an outstanding feature of electric furnace steelmaking. The characteristics of open-hearth furnaces, especially converters, are not significant, and there is no recovery period. The oxygen blowing criterion of the refining method is also significantly different. The converter is blowing oxygen from the charging to the tapping, while the electric furnace of the NM500 composite wear-resistant steel plate only blows oxygen during the melting and oxidation periods, and the open hearth furnace only Essence in the early stage. q The current market of Xingtai County, Xingtai City has entered the off-season consumption season, and there is almost no inquiry, and steel transactions are deserted. The decline was mainly due to the reduction of steel mills. Because resources are mostly kept in the plants, changes in steel mills directly affect the adjustment of the spot market. Therefore, the market is difficult to change the weak pattern in the near future. In the case of a rapid decline in the long term, traders' confidence is completely hit by it, and it is “falling by the sky”. In addition, it has entered the "1 era", and the steel market is even more scared. It is still bearish on the construction steel market next week. Near the end of the year, the demand of many downstream end-users slowed down. As a result of the asymmetry between the purchase volume and the market volume of the alloy welding wire manufacturers in Xingtai County, Xingtai City, oversupply was caused. Market performance is good, composite wear-resistant steel plate, composite wear-resistant steel plate; spray welding wire, Xingtai County, Xingtai County, nickel alloy electrode welding wire, alloy welding wire manufacturers with high pressure rating, good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, Radiation protection, long life. Slightly stronger reaction. Under the atmosphere of futures shocks and rising raw materials and general freight rates, special product companies integrating research and development. Long-term 8 composite wear-resistant steel plates, 6 composite wear-resistant steel plates, spray welding wire, alloy welding wire manufacturers. The market is enthusiastic. increase. According to the monitoring data, on the 23rd, the average rebar 20mm HRB400E in 24 major markets across the country averaged 2483 yuan / ton, up 6 yuan / ton from the previous trading day. 75 hot rolled coils in 24 major markets across the country averaged 2810 yuan / ton, up 11 yuan / ton from the previous trading day. The average price of 14-20mm ordinary medium-sized board in 23 major markets across the country was 2657 yuan / ton, an increase of 8 yuan / ton from the previous trading day. The 0mm cold rolled coil in 22 major markets across the country averaged 3,500 yuan / ton, up 11 yuan / ton from the previous trading day. As the market began to retreat in the month, the overall situation of the steel market has also changed. It is that the profits of large and medium-sized steel companies in China have been significantly compressed. The early adjustment of prices has approached the psychological bottom line of steel companies. This is mainly due to the difference between the rising time period of raw materials and the rising period. Decreasing ore prices and relatively little ore inventory in the plant, new purchased raw materials will continue to support the steel price; domestic steel companies still have coke storage demand, due to the strict restrictions on coking coal production in the early stage, which has led to a continuous rise in coke Moreover, due to the poor transportation of National Highway 309 in Hebei Province, the freight rate of raw materials has increased sharply in August. In addition to the recent increase in freight rates, the demand for coke replenishment of steel enterprises still exists; The failure of performance has become a major factor in the downturn in business sentiment. In the short term, we should not place hope on the emergence of a substantial reversal of the market. The market only makes a small range of center-up operations when there are some favorable external market factors, and that's it. The market sentiment has gradually improved, with northern finished products rising slightly, heavy shipments, steel mills raising the ex-factory price of threads, stable high-line coils, and market follow-up adjustments. Liuzhou Steel's inventory is under pressure, and the current price is down 10 yuan. In terms of transactions, according to traders, Liugang currently has an inventory of about 150,000 tons, which is under great pressure, and the supply and demand in the market are unbalanced, making it difficult to ship. Jian Jian billet rose by 20 at noon, there is still support at the cost end, it is expected that the price of wear-resistant plate is mainly stable. It is learned from the market understanding that the related futures surged during the session, which obviously boosted the market mentality, but the fundamentals of demand have not changed significantly, the market price has limited driving force, and the performance of transactions after the rise is not overall. The merchants' mentality is cautious and good. There is support on the cost side. Northwest China, especially in Shaanxi and Gansu, are mainly stable this week. This week, both the plate and HRC in Lanzhou and Xi'an have shown a slight decline. At the time of writing, hot-volume futures have picked up. After experiencing a period of turbulence, black futures have declined in the early part of this week, but they have risen since the middle of the week. According to business feedback, the current local market transactions have shown signs of improvement, especially in recent days, the futures market is stable and improving, and the wear-resistant welding wires of Xingtai County, Xingtai City have all risen to varying degrees, and the overall change has reached the trade of traders Expected. In terms of good companies, although the market is generally in a relatively calm state recently, and billets have also fluctuated, but considering the current profit expansion, 65mn steel plate mills are not eager to reduce their factory shipments, and many steel mills have appropriately increased some of them in the early part of the year. Steel. Due to the continuous demand, the significant increase in the supply of 45 # steel plates, and the strength of the US dollar, many basic metals such as nickel, tin, lead, and zinc, which have been bullish in the first half of this year, have seen significant corrections since September. The industry generally expects that it will be difficult for basic metals to reproduce the excellent performance of the first half of the year with less than two months left. Based on the closing price on September 4, the three-month nickel period on the London Metal Exchange (LME) has fallen by 24% to a level of $ 15,150 per ton. As the basic metal that performed well in the first half of the year, the cumulative increase in nickel this year has narrowed to 9%. In May this year, the nickel futures price reached a high of US $ 21,000 per ton, which was a cumulative increase of US $ 14,000 per ton from the beginning of the year. 50%. Based on the closing price on September 4, the LME 3-month zinc futures price has fallen by 7%, the lead futures price has fallen by 6%, and the tin futures price has fallen by 8%. The stock market has strongly opposed the steel futures and steel spot movements, which has led to a cumulative decline in copper futures prices. 3 %, The aluminum futures price fell 4%. If a 20% drop from the previous high is set for a phased bear market, only nickel is "attained" at present, but it can be seen that several other metals have also drifted away from the previous bull market. Goldman Sachs pointed out that, like other commodities, the decline of the above-mentioned several basic metals is accompanied by the rise of the dollar. Products, tens of millions of products to choose from, nm360 composite wear-resistant steel plate, nm400 composite wear-resistant steel plate, nm500 composite wear-resistant steel plate , nm550 composite wear-resistant steel plate, nh235 weather-resistant steel plate, nh355 weather-resistant steel plate, Xinyu manufacturers are safe to trade. And in the context of the Federal Reserve will gradually enter the currency tightening cycle, the strong dollar pattern will undoubtedly continue to suppress metal reaction. Credit Suisse emphasized that from the recent trend and fundamental prospects, it is relatively optimistic about the outlook for aluminum prices. The data shows that, unlike several other metals, the price of aluminum has seen a more pronounced and persistent reversal since October. This is mainly for large customers. The needs of small customers of 20 # steel plates are too diverse to meet. Therefore, the so-called "direct supply" of steel mills can only reach a certain percentage. Small steel traders will continue to exist, but At this stage, those with weak competitiveness will be eliminated. kQ commonly used cooling media are: oil, water, brine, etc., and its cooling capacity increases accordingly. After the material is broken, the percentage of its plastic elongation to the original sample length is called elongation or elongation.