Stainless steel mug main material - stainless steel
Insulation cup industry will often involve 201 stainless steel, 304 stainless steel and other professional terms, then what is 201,304 stainless steel yet.
This we must first know what is stainless steel, the so-called stainless steel refers to the resistance to air, steam, water and other weak corrosive media and acid, alkali, salt and other chemical etching corrosive media of steel, by adding nickel, molybdenum, titanium, niobium, Copper, nitrogen and other elements of the alloy.
304 stainless steel is a versatile stainless steel, rust-proof performance than the 200 series of stainless steel stronger. High temperature is also better, can be high to 1000-1200 degrees. 304 stainless steel has excellent stainless steel corrosion resistance and better resistance to intergranular corrosion. Of the oxidizing acid, in the experiment concluded that: concentration ≤ 65% of nitric acid below the boiling temperature, 304 stainless steel has a strong corrosion resistance. Alkali solution and most organic acids and inorganic acids also have good corrosion resistance.
According to the composition, it can be divided into Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni series (200 series) and precipitation hardening series (600 series). 200 Series - Chrome-Nickel-Manganese Austenitic Stainless Steel 300 Series - Chrome-Nickel Austenitic Stainless Steel 301 - Good ductility for molded products. It can also be hardened by mechanical processing. Good weldability. Anti-wear and fatigue strength is better than 304 stainless steel. 302 - With 304 corrosion resistance, due to the relatively high carbon content and therefore better strength. 303 - It is easier to cut than 304 by adding a small amount of sulfur and phosphorus. 304 - 18/8 stainless steel. GB grade 0Cr18Ni9.
International stainless steel labeling method
American Iron and Steel Institute is a three-digit number to mark a variety of standard grade of malleable stainless steel. among them:
① austenitic stainless steel with 200 and 300 series of digital signage.
② ferrite and martensitic stainless steel with 400 series figures. For example, some of the more common austenitic stainless steels are labeled 201, 304, 316, and 310.
③ ferritic stainless steel is marked with 430 and 446, martensitic stainless steel is 410,420 and 440C marked dual phase (austenitic-ferritic).
④ stainless steel, precipitation hardened stainless steel and iron content of less than 50% of the high alloy is usually the name of the patent or trademark.
4). Standard classification and grading
The tensile strength σb (MPa) ≥520, the conditional yield strength σ0.2 (MPa) ≥205, the elongation δ5 (%) ≥40, the reduction of area ψ (%) ≥60, the hardness: ≤187HB; ≤90HRB; ≤200HV
After we know these parameters of stainless steel, we should probably know about the main materials of these mugs. Poor stainless steel materials are very poor in corrosion resistance and acid and alkali resistance. Simple and concise, that is, the main material of the mug has good or bad points. The reason is simple, a good cup must be made of good stainless steel, and good stainless steel is bound to increase costs. In the case of many small factories, they have no brand, no innovation, no scale and no market. How to get a cup of tea in the highly competitive cup pot market, only cutting corners and making raw materials. So many small factories abuse 201 and other poor quality steel, and even some unscrupulous traders manufacture stainless steel insulation mug. If non-professionals, just from the appearance of a cup material is difficult to judge the situation, which makes unscrupulous manufacturers have a niche, ultimately infringing on consumers.