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September 3, 2019
Different Stainless steel types have different characteristics and usages.In CNC machining process, stainless steel turned part or milling parts are widely be used in machine manufacturing or other industries. Also, in different county, it be classified into to different serious. This article has a detail statement for stainless steel.
The sulphur content of steel should not exceed 0.05%, and the phosphorus content of general steel should be limited to less than 0.045%.
So the content of sulfur and phosphorus is an important index.
STAINLESS STEEL TYPES
Commonly used digital symbols for stainless steel models are 200 series, 300 series and 400 series. They are the representation of the United States Stainless steel types, such as 201, 202, 302, 303, 304, 316, 410, 420, 430, etc. Chinese stainless steel models are represented by elemental symbols plus numbers, such as 1Cr18Ni9, 0Cr18Ni9, 00Cr18Ni9, 1Cr17, 3Cr13, 1Cr17M. N6Ni5N, etc. Numbers denote the corresponding element content.
stainless steel CNC turned part
It has good ductility and can be used for moulding products. It can also be hardened by machine speed. Good weldability. The wear resistance and fatigue strength are better than 304 stainless steel.
Corrosion resistance is the same as 304, and its strength is better because of its relatively high carbon content.
It is a stainless steel with high silicon content. It has high oxidation resistance at high temperature.
By adding a small amount of sulfur and phosphorus to make it more machined.
It is also used to make parts requiring hot upsetting, because under such conditions, this stainless steel has good hot workability.
18/8 stainless steel. GB is 0Cr18Ni9. 309: It has better temperature resistance than 304.
It is a variant of 304 stainless steel with low carbon content. It is used for welding occasions. Lower carbon content minimizes the amount of carbides precipitated in the heat affected zone near the weld, and the precipitation of carbides may lead to intergranular corrosion (welding corrosion) of stainless steel in some environments.
A stainless steel containing nitrogen. Nitrogen is added to improve the strength of the steel.
High nickel content, low work hardening rate, suitable for various occasions requiring high cold formability.
Used for making welding rods.
Nickel and chromium contents are relatively high in order to improve the oxidation resistance and creep strength of steel at high temperature. While 30S5 and 310S are variants of 309 and 310 stainless steel, the difference is only that the carbon content is low, in order to minimize the carbides precipitated near the weld. 330 stainless steel has very high carburizing resistance and thermal shock resistance.
Containing aluminium, the pitting corrosion resistance of 304 stainless steel in marine and chemical environment is much better than that of 304 stainless steel. Among them, 316 stainless steel includes low carbon stainless steel 316L, high strength stainless steel 316N containing nitrogen and free cutting stainless steel 316F with high sulphur content.
Stainless steel stabilized by titanium, niobium plus tantalum and niobium, respectively, is suitable for high temperature welding components. 348 is a kind of stainless steel suitable for nuclear power industry, which limits the amount of tantalum and drill.
hexagon end bar(stainless steel)
Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni
The cheapest model (Anglo-American), usually used for automotive exhaust pipes, is ferritic stainless steel (chromium steel)
Martensite (high strength chromium steel), good wear resistance, poor corrosion resistance. 416: Adding sulphur improves the processability of the material.
“Tool grade” martensitic steel, similar to Brinell high chromium steel, the earliest stainless steel. It’s also used for surgical knives. It can be made very bright.
Ferritic stainless steel for decorative purposes, such as automotive accessories. Good formability, but poor temperature resistance and corrosion resistance
High strength cutting tool steel, slightly higher carbon content, after appropriate heat treatment can obtain higher yield strength, hardness can reach 58HRC, belongs to the hardest stainless steel. The most common example of application is the razor blade. There are three common models: 440A, 440B, 440C, and 440F (easy-to-process type).
The most commonly used type of precipitation hardening stainless steel, also known as 17-4; 17% Cr, 4% Ni
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