Stainless steel 304 with 202 between divisional

Stainless steel 304 with 202 between distinguish

About stainless steel analytic
One, what steel is stainless steel?
Stainless steel is a sort of steel, steel is to point to contain carbon (C) the quantity is in 2% say below for steel, be more than 2%
It is iron. Steel joins chromium in smelt process (Cr) , nickel (Ni) , manganese (Mn) , silicon (Si) , titanium (Ti) , molybdenum (Mo) the function that waited for alloying element to improve steel makes steel was had be able to bear or endure corrupt sex (do not go up namely.
2, why does stainless steel have different steel grade?
Stainless steel is among smelt process, because join alloying element breed to differ, what different breed adds a capacity is different.
Its character also is different, the steel grade that differs to try to distinguished a coronal to go up, common adornment is below with stainless steel watch of content of ” of alloying element of “ of different steel grade offers reference only:
Steel grade carbon (C) silicon (Si) manganese (Mn) phosphor (P) sulfur (S) chromic (Cr) nickel (Ni) molybdenum (Mo) copper (Cu)
304 ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.03 18-20 8-10
301 ≤0.15 ≤1.00 ≤2.00 ≤0.045 ≤0.03 16-18 6-8
202 ≤0.15 ≤1.00 7.5-10 ≤0.05 ≤0.03 17-19 4-6
201 ≤0.15 ≤1.00 5.5-7.5 ≤0.05 ≤0.03 16-18 3.5-5.5

3, what kind of stainless steel rusts not easily?
The main factor with influence rustily stainless steel has at 3 o'clock:
One of: Of alloying element content, popularly says chromic content rusted not easily in 10.5% steel. Of chromic nickel
Content jumps over tall anti-corrosive properties to had been jumped over, the content that like 304 material qualitative nickel wants is in 8-10% , chromic content achieves 18-20% , such stainless steel is won't rusty usually.
Secondly: The smelt technology that manufactures a business also can affect the corrosion resistance of stainless steel. Smelt technology good, equipment no matter the big stainless steel plant with advanced, advanced technology is the control in alloying element, the control of temperature of refrigeration of the purify of foreign matter, billet can get assuring, because this product is simple quantity stability is reliable, immanent quality is good, rust not easily. Conversely a few small steelworks device are backward, craft is backward, in smelt process, foreign matter cannot purify, product hard to avoid of production will be rusty.
Thirdly: External environment, climate is dry breezy environment rusts not easily. And air humidity is big, weather of successive overcast and rainy, or the environmental area with great acid-base value is contained to become rusty with respect to Yi Sheng in air. 304 material qualitative stainless steel, if circumjacent environment is too poor,also be can rusty.
4, stainless steel does not take magnetism namely, is taking magnetism good stainless steel? If microstrip magnetism be 304?
A lot of clients buy stainless steel to the market, oneself takes a small magnet, when seeing money, suck, think not to suck those who go up
It is good stainless steel. Did not take magnetism to won't rust, actually this is a kind of wrong understanding. Stainless steel belt does not take magnetism organize structural decision, because caky temperature can not form “ ferrite ” together,molten steel is in among caky process
The stainless steel of the different organization structure such as ” of martensite of “ austenite ”“ , among them stainless steel of ” of martensite of “ ferrite ”“ takes magnetism. And join forces of its put together learns stainless steel of “ austenite ” function, technical properties solderability is good, but only the stainless steel of “ ferrite ” of from corrosion resistance character belt magnetism is ambitious at stainless steel of “ austenite ” . What the Gao Han manganese with at present current market contains nickel less is alleged stainless steel of 200 series, 300 series also does not take magnetism, but of its function and Gao Han nickel of 304 far apart, instead, 304 courses drawing, anneal, polish, cast wait for craft processing to also be met microstrip is magnetic, because this uses stainless steel belt not to take magnetism to judge the actor of low quality of stainless steel,be a kind of misunderstanding, also be unscientific.
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