This we must first know what is stainless steel, the stainless steel refers to the resistance of air, steam, water and other corrosive medium and weak acid, alkali, salt and other chemical attack by corrosive medium steel, nickel, molybdenum, by adding titanium, niobium, nitrogen and other elements, copper alloy.
304 stainless steel stainless steel is one kind of universal material, antirust performance than the 200 series stainless steel material. High temperature resistance is better, can be high to 1000-1200 degrees. 304 stainless steel has excellent stainless steel corrosion resistance and good resistance to intergranular corrosion. On oxidizing acid, in the experiments : the concentration of≤ 65% boiling temperature following nitrate, 304 stainless steel has high corrosion resistance. The alkali solution and the most organic and inorganic acid also has good corrosion resistance.
According to the components can be divided into Cr (Series 400 ), CrNi series (series 300 ), CrMnNi (Series 200 ) and precipitation hardening coefficient ( 600 series ). 200 series - chromium - nickel manganese austenitic stainless steel 300 series - chromium - nickel austenite stainless steel 301, good ductility, used for molding products. Also available through machining the rapid hardening. Good weldability. Abrasion resistance and the fatigue strength is better than that of 304 stainless steel. 302 - corrosion resistance with 304, the carbon is relatively high and strength. 303 - by adding small amounts of sulfur, phosphorus and make it more easily than 304 cutting. 304 - 18/8 stainless steel. GB type 0Cr18Ni9.
International stainless steel marking method of American Iron and Steel Institute is to use three digits to indicate a variety of standard wrought stainless steel. Of which: ①austenitic stainless steel 200 and 300 series digital label,②Ferritic and martensitic stainless steel with 400 series digital representation. For example, some relatively common austenitic stainless steel is 201, 304, 316 and 310 as a marker, the ferritic stainless steel in 430 and 446 as a marker, martensitic stainless steel is in 410, 420 and 440C mark, duplex ( Austenitic - Ferritic ), stainless steel, and the precipitation hardening stainless steel the iron content of less than 50% of the high alloy is usually adopt patent name or trademark naming. 4). A standard classification and grading
Tensile strength σ B ( MPa )≥ 520, conditional yield strength σ0.2 ( MPa )≥ 205, elongation ( % 5 )≥ 40, shrinkage rateψ( % )≥ 60, hardness:≤ 187HB≤ 90HRB≤ 200HV;;
Our understanding of the stainless steel of these parameters, probably for those of us insulation cup main material to understand somewhat, difference of stainless steel corrosion resistance, acid and alkali resistance and very weak. Concise and comprehensive, is insulation cup main materials have a division of good and bad. The reason is simple, good insulation cup must make good use of stainless steel materials, and stainless steel is bound to increase the cost of. With a lot of small factory as an example, they have no brand, no innovation, no scale, without the market, how in the fierce competition in the cup and pot Market drank a cup of a thick soup, only Jerry, crudely made. So a lot of small plant abuse 201 steel materials of poor quality, and even some unscrupulous traders with stainless iron manufacturing insulation cup. Were it not for the professional person, only from the appearance it is difficult to judge a cup of thermal insulation material, which makes the illegal manufacturers have a tiny bit of land, and ultimately consumers against.
Independent companies of industry of river, are actively involved in the insulation cup industry standards, then the cup insulation materials industry standards will be incorporated into the national standards, insulation cup each material will also be in manual labeling, consumers can know cup insulation materials. Before we warning consumers buy the brand insulation Cup, know more about insulation Cup recognition method, so as to avoid damage to the interests of their own.