With the continuous development and progress of society, stainless steel as a new material is more and more well-known by people, and application of stainless steel fields are becoming wider and wider.
However, as a person in the non-stainless steel industry, people do not understand the various properties and uses of stainless steel in daily life. Buying stainless steel products cannot fully understand all aspects of the products. How can you buy reliable products?
Don’t worry, today I will take you to understand the performance and use of the full range of stainless steel.
Stainless steel is divided into three series: 200, 300, 400 (except duplex steel), the main varieties are 201, 202, 304, 304J1, 304L, 321, 316 (L), 309S, 310S, 430, 409L, etc.
201
Features of 201 : acid and alkali resistance, high density, polishing without bubbles, no pinholes, etc.;
Applications: mainly used to make decorative tubes, industrial tubes and some shallow stretched products;
202
Features: reduced nickel and increased It contains Mn and N; has good mechanical properties and corrosion resistance; has good oxidation resistance and medium temperature strength below 800 degrees;
Applications: decorative pipes, industrial pipes and some shallow-drawn products;
304
Features: good Corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment hardening phenomenon (non-magnetic, use temperature -196℃~800℃);
Applications: 304 is the most used in the stainless steel family A wide range of appliances, tableware, kitchenware, water heaters, boilers, food machinery, etc. can be used. For the daily use of kitchens, daily necessities and other household goods, it is best to buy 304 finished products, of course, if they are food grade;
304J1
Features: Cu elements are added on the basis of 304, so its formability, especially Good wire drawing and ageing crack resistance, and can be formed into complex shapes; corrosion resistance is the same as 304;
Applications: used to replace some 304 applications; mainly used for thermos, kitchen sinks, pots, pots, heat preservation Lunch boxes, door handles, textile processing machines, etc.;
304L
Features: Compared with 304, 304L has reduced C content. Under normal conditions, its corrosion resistance is similar to 304 steel, but after welding or stress relief, its Excellent resistance to grain boundary corrosion. It can also maintain good corrosion resistance without heat treatment, generally used below 400 (non-magnetic, use temperature -196℃~800℃).
Applications: chemical, coal, coal, Petroleum industry outdoor machinery, building materials, heat-resistant parts and parts that are difficult to heat treatment;
321
Features: On the basis of 304, Ti element is added to improve the resistance to grain boundary corrosion. It is suitable for temperatures of 430℃~900℃;
Applications: medical appliances, building materials, chemistry, agriculture, ship parts, nuclear energy industry, aircraft, pipes, boiler drums, auto parts (windshield wipers, mufflers, molded products);
316 (L)
Features: 316 contains Mo elements , Corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and it can be used under harsh conditions. Excellent work hardenability (non-magnetic); 316L has a low content of C element compared to 316, and its grain boundary corrosion resistance is excellent;
Applications: 316 and 316L are mainly used for equipment, chemistry, dyes, etc. in seawater with high requirements for corrosion resistance. papermaking. Oxalic acid, fertilizer and other production equipment; food industry, coastal area facilities, ropes, CD rods, bolts, nuts;
309S
Features: 309S has excellent high temperature resistance, corrosion resistance and strength;
Applications: suitable for working temperature at 1000 ¡æ Parts; exhaust machines, heat treatment furnaces and heat exchangers, etc.;
310S
Features: good oxidation resistance, corrosion resistance and high temperature resistance; due to the high content of chromium and nickel, 310S has strong creep strength, It can work continuously at high temperature and has good high temperature resistance;
Applications: boilers, exhaust machines, heat treatment furnaces and heat exchangers and other high-temperature environments;
430
Features: low thermal expansion rate, excellent formability and oxidation resistance;
Applications: 430 It is the most representative steel grade of ferritic stainless steel and has a wide range of uses; heat-resistant appliances, burners, home appliances, class 2 tableware, kitchen sinks, exterior decoration materials, bolts, nuts, CD rods, screens, etc. Can be applied;
409L
Features: containing Ti element, high temperature corrosion resistance and high temperature strength;
Applications: automotive exhaust pipes, heat exchangers, containers and other products that need not heat treatment after welding;
stainless steel is the main production element of the national economy , The application in the national economy is very wide, here is only a part of the stainless steel, other steels like 2205, ultra-pure ferrite, 410, etc. have many applications, I will not introduce them here. Students who want to know can search and understand by themselves.