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What is the general application of stainless steel balls?

2019-12-29

DONGYUAN

classification of stainless steel: according to the main chemical composition, it can be divided into chromium stainless steel, chromium nickel stainless steel, chromium manganese nitrogen stainless steel, chromium nickel molybdenum stainless steel, ultra-low carbon stainless steel, high molybdenum stainless steel, high purity stainless steel, etc; According to the performance characteristics and uses of steel, such as nitric acid resistance (Nitric acid grade) Stainless steel, sulfuric acid resistant stainless steel, pitting resistant stainless steel, stress resistant stainless steel, high strength stainless steel, etc. According to the functional characteristics of steel, such as low temperature stainless steel, non-magnetic stainless steel, free cutting stainless steel, superplastic stainless steel, etc. U. S. classification method: characteristics and uses of 200, 300 and 400 series products. ( 201, 202, 300, 301 materials are similar, mostly used for decorative materials). 200 series: austenitic stainless steel. Features: low Ni content, easy to rust. Rust removal: use bright paste, water-based Bright paste, smooth water, rust prevention: Film protection liquid, water-based film protection liquid.

uses: stainless steel strip, used for decorative materials, stainless steel doors and windows, stainless steel stair handrails, anti-theft nets, etc. 300 series: austenitic stainless steel. Features: High Ni content and good corrosion resistance. Uses: used in industry, chemical equipment, printing and dyeing equipment, etc. 400 series: Horse austenitic, ferritic stainless steel. Features: no Ni, easy to rust. Stainless steel hollow balls are rust-proof and are used for tableware, knives and cutting tools. Austenite is usually classified by metallographic structure (A) Type I stainless steel: austenitic stainless steel is marked with 200 and 300 series numbers. Its microstructure is austenite. It is to add appropriate nickel to high chromium stainless steel (The mass fraction of nickel is 8% ~ 25%)And formed. 1Cr18Ni9Ti (321), 0Cr18Ni9 (302), 00Cr17Ni14M02 (316L)Advantages: Easy to weld, good plasticity (Not easy to break), More deformation, good stability (Not easy to rust)Easy to passivate.

ferrite (F)Type stainless steel: 400 series digital representation. Its internal microstructure is ferrite, and its chromium mass fraction is 11. 5% ~ 32. 0% range. With the increase of chromium content, its acid resistance is also improved, adding molybdenum (Mo) After that, it can improve the ability of acid corrosion resistance and stress corrosion resistance. 00Cr12, 1Cr17 (430) , 00Cr17Mo, 00Cr30Mo2, Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28 and other advantages: high chromium content, good thermal conductivity, good stability and good heat dissipation. Uses: it is mostly used for acid-resistant structures with little stress and for anti-oxidation steel, such as: cookers, exhaust pipes (Behind the motorcycle). Martensite (M)Type stainless steel: 400 series digital representation. Its microstructure is martensite. The mass fraction of chromium in this kind of steel is 11. 5% ~ 18. 0%, but the mass fraction of carbon can reach 0. 6%. The increase of carbon content improves the strength and hardness of steel. A small amount of nickel added to this kind of steel can promote the formation of martensite and improve its corrosion resistance at the same time. 1Cr13 (410), 2 Cr13 (420), 3 Cr13 (), 1 Cr17Ni2 ()Advantages: high carbon content and high hardness.

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