How do stainless steel balls be classified?
in atmospheric and acid, alkali, salt and other corrosive media in present blunt state, corrosion resistance and does not rust of high chromium (Generally 12% ~ 30%) Alloy steel, so the chromium content of stainless steel balls must be greater than 12%. In other words, stainless steel without chromium does not exist, but stainless steel can contain no nickel. We can be divided into the following from the structure of stainless steel spheres: martensite, austenite and ferrite can be divided into three categories. The difference between them is mainly determined by the content of nickel and chromium. Martensitic stainless steel mainly contains more chromium and almost no nickel. Austenitic stainless steel mainly contains more nickel, but at the same time contains more than 12% chromium.
typical martensitic stainless steels include 1Cr13, 2CR13, 3CR13, 4Cr13, 9Cr18, 9CR18MO and other 1Cr13 steels with good processing performance. Deep drawing, bending, crimping and welding can be carried out without preheating. 2Crl3 does not require preheating before cold deformation, but preheating is required before welding. 1Crl3 and 2Cr13 are mainly used for stainless steel balls with low requirements and hardness, however, 3Cr13 and 4Cr13 are mainly used to make surgical scalpels and wear-resistant parts for medical instruments; 9Crl8 can be used as corrosion resistant bearings and tools. Markov-shaped steel balls can be hardened by oil quenching, 420 (Domestic brand 2CR13, 3CR13) The hardness is usually in HRC48-55, while 440 (9CR18)The hardness of is usually greater than hrc58. The hardness relationship of martensitic steel stainless steel balls is as follows: 9CR18> 4CR13> 3CR13> 2CR13> 2CR13> 1CR13
The Cr content of ferrous stainless steel is generally 13%-The carbon content of 30% is less than 0. 25%. Sometimes other alloy elements are added. The metallographic structure is mainly ferrite, which also has good thermal workability and certain cold workability. Ferritic stainless steel is mainly used to make components with high corrosion resistance but low strength requirements. It is widely used to make valves, and kitchen supplies
Typical ferrite has 0Crl7, 1CR17 stainless steel ball. It is easier to process and has good weldability. Austenitic stainless steel is developed to overcome the insufficient corrosion resistance and excessive brittleness of Markov stainless steel. The basic composition is Crl8 %, Ni8 % referred to as 18-8 Steel. Its characteristic is that the carbon content is less than 0. 1%, using Cr and Ni to obtain single-phase austenite structure. This kind of stainless steel ball usually has good anti-rust and anti-corrosion properties and is easy to process.
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