Wuxi supplies martensitic stainless steel pipes
Our company sells round steel of various brands and specifications nationwide, and sells to Chengdu Iron and Steel, Yegang, Baotou Steel Plant, Baosteel, Anshan Iron and Steel, Xining Special Steel Plant, Various round steel produced by Wuxi Steel Plant, Northeast Special Steel, Jiangyou Great Wall Special Steel, Huaigang, Hangzhou Iron and Steel and other major steel plants.
Martensitic stainless steel is a type of stainless steel whose properties can be adjusted through heat treatment (quenching and tempering). Generally speaking, it is a type of hardenable stainless steel. This steel has high hardness and good mechanical properties. and stainlessness. These characteristics determine that this type of steel must have two basic conditions: First, there must be an austenite phase area in the equilibrium phase diagram, and long-term heating within the temperature range of this area will solidify the carbides. After being dissolved into the steel, it is quenched to form martensite, that is, the chemical composition must be controlled in the mm or mm+h phase region. Second, in order for the alloy to form a passive film that is resistant to corrosion and oxidation, the chromium content must be above .%. . According to the differences in alloying elements in the steel, martensitic chromium stainless steel can be divided into three types: low carbon, medium carbon and high carbon. Martensitic stainless steel has a tetragonal crystal structure in the quenched state, is ferromagnetic, and has corrosion resistance in weakly corrosive environments. The chromium content in steel can reach %, and the carbon can exceed .%. In order to improve the anti-corrosion resistance and the sharpness of the cutting tool, excess carbides are allowed to exist in the structure. In order to improve the tempering effect after quenching, niobium, silicon, and tungsten can be appropriately added. Nickel-containing martensitic stainless steel improves the corrosion resistance of chromium martensitic stainless steel in certain media and increases the toughness of steel. Carbon in martensitic stainless steel is an indispensable and important element. It makes the mm phase zone formed by the iron-chromium binary alloy and determines the martensitic hardness of the steel in the quenched state. A large number of experiments have shown that the hardness value of .% martensite is approximately .%, and the hardness value of .% martensite can exceed .%. The hardness value of higher carbon has no significant change.
There are a total of martensitic stainless steel grades listed in our country's standards, basically two types: %r and %r. Some improved grades are derived in order to give other characteristics to the steel. Martensitic stainless steel, due to its good mechanical properties and moderate corrosion resistance as well as good heat resistance below ℃, has been widely used in various industrial fields. Low-carbon and medium-carbon martensitic stainless steels, such as R and Improved type, mainly used in steam turbines, jet engines, gas turbines and other fields. This material is also widely used in the petroleum and petrochemical industries.
Slightly higher carbon martensitic stainless steel such as r is mainly used for cutting tools, valve parts, gears, pulleys, switch shafts and other mechanical parts, rods and rollers, high carbon martensitic stainless steel, plus rM, etc. Fields include knives, bearings, surgical and dental instruments, scissors, springs, valves, shafts, etc. The temper brittleness temperature range of martensitic stainless steel appears at ~°C. The impact toughness of tempered steel at this temperature drops sharply. For parts requiring impact resistance, tempering at this temperature should not be used and applications within this temperature range should be avoided.
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Wuxi supplies SA268TP430 martensitic stainless steel pipe