the material of stainless steel valve is made of iron, chromium, carbon and many different elements of alloy, iron is the main component elements, chromium is the first main alloy element. In general, at least 11% chromium content can be referred to as the stainless steel valves, because if the chromium content is insufficient, the stainless steel valves appearance will not be able to form the chrome oxide layer of dense protective film, and lose the function of rust (corrosion). If the content of chromium enough, at room temperature in the atmosphere, will not rust.

most at ordinary times often see the stainless steel valve casting and forging body such as: cast CF8 ( Forging F304) Casting, CF8M ( Forging F316) Casting, CF3 ( Forging F304L) Casting, CF3M ( Forging F316L) 。

stainless steel valve material usually according to the matrix was divided into four categories:

1) ferritic stainless steel valves: chromium containing 12% ~ 30%. Its corrosion resistance, toughness and weldability with chromium content increases with the increase of chloride stress corrosion resistance is superior to other types of stainless steel valves.

(2) : austenitic stainless steel valve containing chromium is more than 18%, also contains about 8% nickel and small amounts of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, corrosion resistant to a variety of media.

3. Austenitic - Ferrite duplex stainless steel valve: with the advantages of austenite and ferrite stainless steel ball Industrial Valves, and has the superplasticity.

(4) martensitic stainless steel valves, the intensity is high, but the plasticity and poor weldability.

stainless steel ball valve material by metallographic is divided into five categories:

1, the field of stainless steel valves,

304, 316 stainless steel valves, such as 304 standard composition is 18% chromium and 8% nickel, namely the 18 - referred to in general 8 stainless steel valves. Such characteristics of the stainless steel valve is non-magnetic, unable to borrow by heat treatment to change its metallographic structure, good processability, and because of containing alloying elements - - Corrosion resistance of nickel, so better than only containing chromium (excluding nickel) of the other two kinds of stainless steel valves.

300 series stainless steel valves main purposes are: the general purpose of the people's livelihood, such as water; Industrial applications such as oil, chemical industry equipment and petroleum machinery on the pipeline. In the minds of ordinary people, stainless steel valve means 300 series stainless steel, etc. (especially refers to the 304 stainless steel valves).

2, department of martensitic stainless steel valves

this kind of typical steel valves for 410 stainless steel valve, its chemical composition containing chromium, 0 13%. Less than 15% of carbon and alloy small amounts of other elements. Raw material price is cheaper, magnetism, heat treatment hardening, can increase the intensity. But because do not contain nickel, its corrosion resistance is worse in the general of 304 stainless steel valves, so it can only be used for mild corrosive environment.

3, ferritic stainless steel valves

this kind of representative steel valves for 430 stainless steel material valve, the standard chemical composition of 16 ~ 18% chromium, carbon content is low. Such magnetic stainless steel valve, stainless steel ball valve can be if we see the magnet adsorption, are likely to belong to this kind of stainless steel valves. By excluding nickel price is inexpensive, ball valve is generally not the material for 430.

4, precipitation hardening stainless steel valve

the American association of steel AISI number 600 series stainless steel valves. This kind of stainless steel valves in addition to containing chromium and nickel, also contain precipitation hardening elements such as copper, aluminum and titanium, make the material hardening, strength to rise.

5, duplex stainless steel valve

this kind of typical steel grade 2205 stainless steel valves, namely 22% chromium and 5% nickel. The characteristics of this kind of stainless steel valves are: strength (far better than the 304 valves) corrosion resistance is also good, so often used in petrochemical industry pipeline, pressure vessel, etc.

stainless steel Industrial Valves is mainly used in petroleum, chemical, pharmaceutical, chemical fertilizer, power industries under different conditions of piping. In the impression of average person, stainless steel ball valve means 300 series stainless steel valves, etc. (especially refers to the 304 stainless steel valves). as a domestic high-end valve manufacturer, always respond to national policy and called for, committed to researching, developing and manufacturing electric butterfly valve, stainless steel ball valve, discharge valve, electric gate valves, stainless steel gate, stainless steel valve, stainless steel check valve, high pressure gate valves high-quality let customer trust of good valve, the valve to keep traditional valve product sales profits to escort for the innovation research.

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