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Stainless steel is one type of alloy steel that possesses properties of weak corrosive medium resistance, such as atmosphere, steam, water and chemical etching mediums like acid, alkali, salt and so on. Also known as stainless acid-resistant steel. In pratical applications, stainless steel means the property of weak corrosive medium resistance and of chemical etching medium resistance called acid-resistant steel. Because of the difference of chemical compositions, the previous steel may not resist chemical mediator corrosion and while the later generally possesses rustless property. The corrosion resistance of stanless steel depends on the alloying elements. The basic alloying elements of stainless steel have also Nickel, Molybdenum, Titanium, Niobium, Cupper, Nitrogen,meeting different usages are for requirements of structure and performance of stainless steel. Stainless steels are easily etched by chloridion as the chromium, nickel and chlorine are isotopic elements, which will conduct the exchange assimilation and thus form the corrosion of stainless steel.
The corrosion resistance of stainless steel goes down while adding the carbon content. Hence, the carbon content of most stainless steels is generally lower and not more than 1.2%. The main alloy element of stainless steel is Chromium, stainless steels possess property of corrosion resistance while the Chromium contentreaches a certain value. The chromium content of stainless steel is commonly not less than 10.5% and stainless steels also contain other alloy elements like nickel, molybdenum, copper, titanium, manganese, silicon, niobium, nitrogen, and so on.
Classifications and Description
Stainless steels are commonly divided into martensite steel, ferrite steel, austenite steel, duplex (ferritic-austenitic) steel and preciptation hardening stainless steel according to its organization state. Furthermore, are grouped into Chromium stainless steel, chromium-nickle stainless steel and Cr-Mn-N stainless steel according to its compositions.
Ferritic stainless steel
The chromium content is or so 12% ~ 30%, its corrosion resistance, toughness and weldability improve along with the increase of chromium content. Chloridum stress corrosion resistance is superior to other types of stainless steels. Corrosionresistance and oxidatio resistance of ferritic stainless steel are pretty well due to its high chromium content, but possess lower mechanical propertyand processing property. they are widely used in lower stress acidproof structure and oxidationresistant steels, which can resist the corrosion from atmosphere, nitric acid, and saline solution, and also possess excellent property of high temperature oxidation resistance, lower coefficient of thermal expansion. are used in the application of nitric acid and foodstuffs factory equipments, mechanical components at high working temperature,such as mechanical parts for combustion gas turbine. Main steel grades are below listed: ASTM XM-34, AISI 430Ti, UNS S43036, AISI/ASTM 442, UNS S44200, UNS S18200, ASTM XM-27.
Austenitic stainless steel
The chromium content is 18%, or so 8% nickel and elements of Molybdenum, Titanium, Nitrogen. Combination property is pretty well, can be corrosive for multiple mediums. Those steels possess excellent plasticity, toughness, weldability, corrosion resistance and Non-magnetism or weak magnetism. and good corrosion resistance in the medium of oxidability and reducibility, which are for processing the acid-resistant equipments, such as anti-corrosive vessel,equipment lining, running piping, equipment parts of nitric acid resistance, and also for main material of stainless steel horologe accessories. Austenitic stainless steel adopts solution treatment generally, that's to say, heating the steel to 1050～1150℃, then water cooling or wind cooling, to obtain single phase austenite structure. Main steel grades are listed:ASTM XM-7, ASTM 310HCb, UNS S31603, ASTM 316LN, UNS S31653, ASTM XM-15, UNS S38100, ASTM F46, UNS S30600, ASTM XM-21, UNS S30452, AISI 317LN, UNS S31753, AISI/ASTM 316Ti, UNS S31635, ASTM 316LN, UNS S31653, ASTM 310MoLN, UNS S31050, UNS S38815.
Duplex stainless steel
Duplex (ferritic-austenitic) stainless steels maintain properties both ferritic steel and austenitic steel and possess the feature of superplasticity, which have each half austenitic and ferritic structures. Under the circumstances of lower carbon content, chromium content 18% ~ 28%, Nickel content 3%~10%. Some other steels contain the alloy elements - Mo, Cu, Si, Nb, Ti, N and so on.Those steels possess the properties of austenite and ferrite steels. Compared with ferritic steels, duplex stainless steels have good plasticity and toughness, non-room temperature fragility,intergranular corrosion resistance and weldability, and alsomaintain the features of ferritic stainless steel 475℃ frangibility, a higher heat conductivity coefficient, superplasticity.Compared with austenitic stainless steel, duplex stainless steel possess high strength, intergranular corrosion resistance and excellent chloride stress corrosion resistant. and also superior pitting resistance. they take as a stainless steel of nickel saving. Main steel grades are below listed: UNS S32205, ASTM 2305, UNS S32304, UNS S32900, UNS S31803, UNS S31200, AISI/ASTM 329, ASTM F55, UNS S32760.
Martensitic stainless steel
High strength, lower plasticity and weldability. Based on higher carbon content, martensitic steels possess higher strength,hardness, abrasive resistance, but its corrosion resistance is not so good, those steels are for mechanical parts with higher mechanical property and normal corrosion resistance. Such as mechanical spring, blades of steam turbines, hydraulic press valves. Those steels are used after quenching and tempering and annealing after forging, impacting as well. Main steel grades are below listed:ASTM XM-30, AISI/ASTM 440C, UNS S44004, ASTM 431, UNS S43100, AISI 410Cb, UNS S41040,
Precipitation hardening-stainless steel
Primary structures are austenite or martensite. The popular steel grades of Precipitation hardening-stainlesssteel are 04Cr13Ni8Mo2Al, Crl7Ni4Cu4Nb, 0Crl7Ni7A1, 0Crl5Ni7Mo2A1, SUS 632, ASTM 632, UNS S15700, ASTM 634, ASTM XM-13, UNS S13800, UNS S35500, ASTM XM-25, UNS S45000, X8CrNiMoAll5-7-2, SUS 631, ASTM 631, UNS S17700, X7CrNiAll7-7, UNS S13800, ASTM 630, S17400. SUS630, STS630, X5CrNiCuNb16-4, which are normally through precipitation hardening (also known as age-hardening) treatment.
Heat Treatment
Heat treatment is only suitable for specific grades ofStainless steel. When heat treating a stainless the hardeningtemperatures, including rate of heating, cooling and soaking times will vary due to several factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult with the heat treatment provider for whole guidance on heat treatment of stainless steel grades.
We are delighted to help work with you the special heat treatment based on your special requirements.
LonghaiSteel Co.,Ltd is Manufacturer and Supplier of ASTM 201 AusteniticStainless steelwith superior quality and competitive quotation, Located in the Chinese Wellknown Special steel manufacturing industry base and processing center.
If you do not find the Austenitic Stainless steel specification you enquire on website, please also contact our technical development department who may be able to assist you with your Specific enquiry. We will supply you with our sincerity, integrity, and professionality.
Specific feature is as follows for reference:
Steel grade and Chemical composition- AusteniticStainless Steel
TOBO GROUP sales head offce in Shanghai.
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai.
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
