Types and differences in stainless steel

Category:
1. According to the organizational structure of the room temperature, there are Ma's body, Ao family type, iron body, and double -phase stainless steel. According to the main chemical component, it can basically be divided into chromium stainless steel and chromium nickel stainless steel Two major systems;
2, according to the use points, there are nitrite stainless steel, sulfuric acid stainless steel, seawater stainless steel, etc., can be divided into corrosion -resistant types can be divided into erosive stainless steel, stress -resistant stainless steel, crystal -resistant corrosion corrosion Stainless steel et al.;
3, classified by functional characteristics can be divided into non -magnetic stainless steel, easy -cut stainless steel, low temperature stainless steel, high -strength stainless steel, and so on. Because stainless steel has excellent corrosion resistance, moldability, compatibility, and strong toughness within a wide temperature range, it has obtained extensive applications in industries such as heavy industry, light industry, living supplies, and building decoration industries. Essence
Differential:
The density proportion first is different, and the degree of anti -rust is different. Of course, the price is very different. Ordinary 304 stainless steel is a alloy, and 304 composite stainless steel is two or three alloys. The combined composite material is often the surface is 304, a layer of materials in the middle, or three layers of clamping.
The insulation cups are generally very common and common. Just like the stainless steel tableware in the cafeteria, stainless steel is harmless to the human body. The effect is the same. For use, there are many types of CR content in stainless steel that can be said to be stainless steel. The stainless steel for ordinary tableware is almost thick.
and the steel cup made of tableware must be stainless steel. This is common sense. What 304 steel does not know who fabricated it? Whether the two types they said are also a kind of stainless steel. A kind of steel.
The stainless steel of the tableware water cup does not have the same level of steel. It is nothing more than a thin point of doing a thicker point.
The expansion information:
304 stainless steel's tensile strength σb (MPA) ≥515-1035
Condition yield strength σ0.2 (MPA) ≥205
≥40
The section contraction rate ψ (%) ≥?
hardness: ≤201hbw; ≤92HRB; ≤210HV
density (20 ° C, G/CM3): 7.93
melting point (melting point (melting point (melting point ( ℃): 1398 ~ 1454
than hot capacity (0 ~ 100 ° C, KJ · KG-1K-1): 0.50
Thermal conductivity (W · M-1 · K-1): (100 ° C) 16.3, (500 ° C) 21.5
line swelling coefficient (10-6 · k-1): (0 ~ 100 ° C) 17.2, (0 ~ 500 ° C) 18.4
resistivity (20 ℃, 10, 10, 10 -6Ω · m2/m): 0.73
The longitudinal elastic modulus (20 ° C, KN/MM2): 193
product standard
For 304 stainless steel, the NI elements in its ingredients are very good It is important to directly determine the anti -corrosion ability and its value of 304 stainless steel.
304 The most important elements are NI and CR, but not only limited to these two elements. The specific requirements shall be stipulated by the product standard. The common judgment of the industry believes that as long as the NI content is greater than 8%and the CR content is greater than 18%, it can be considered as 304 stainless steel. This is why this type of stainless steel is called 18/8 stainless steel.
In fact, the relevant product standards have very clear regulations for 304, and there are some differences in these product standards for different shapes of stainless steel. Here are some common product standards and tests.
If to determine whether a material is 304 stainless steel, you must meet the requirements of each element in the product standard. As long as one does not meet, it cannot be called 304 stainless steel.

Stainless steel is often divided into tissue states: Matrius steel, ferris steel, Aoe body steel, austenitic-ferrite (double phase) stainless steel and precipitated hardening stainless steel. In addition, it can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel. There is also a stainless steel "GB24511 2009 2009 for pressure steel plate and steel belt" for stainless steel for pressure vessels. Ironin stainless steel, 15%to 30%of chromium. Its corrosion resistance, toughness, and weldability are increased with the increase in chromium content. The stress corrosion resistance of chloride resistance is better than other types of stainless steel. This category includes CRL7, CR17MO2TI, CR25, CR25MO3TI, CR28, etc. Because of the high chromium content of iron stainless steel, the corrosion resistance and antioxidant performance are better, but the mechanical properties and process performance are poor. It is mostly used for the use of acid -resistant acid -resistant structures and anti -oxidant steel. This type of steel can resist the corrosion of atmosphere, nitric acid and saline solution, and has the characteristics of high temperature antioxidant performance, small thermal expansion coefficients, etc. It is used for nitric acid and food factory equipment. Essence The austenitic stainless steel contains more than 18%chromium, and also contains about 8%nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, which can resist multiple media corrosion. The commonly used plates of Austenite stainless steel include 1CR18NI9, 0CR19NI9 and so on. The WC u003C0.08%of the 0CR19NI9 steel, the bid for the steel number is "0". This type of steel contains a large amount of Ni and CR, which makes the steel in the auscular state at room temperature. This type of steel has good plasticity, toughness, welding, corrosion resistance, and non -magnetic or weak magnetism. It has good corrosion resistance in the oxidation and reduction medium. Line lining, transportation pipes, nitric acid -resistant equipment parts, etc., can also be used as the main material for stainless steel clock jewelry. The austenite stainless steel is generally soluble, and the steel will be heated to 1050 ~ 1150 ° C, and then water is cold or cold to obtain a single -phase Ajelthyle tissue. Austenitic -Tien double -phase stainless steel. There are advantages of both Austeenia and ferrite stainless steel and have super plasticity. The austenitic and ferrite tissue each account for about half of the stainless steel. In the case of lower C, the CR content is 18%to 28%, and the Ni content is 3%to 10%. Some steel also contain alloy elements such as MO, CU, SI, NB, Ti, N, etc. This type of steel has the characteristics of Austenite and ferrite stainless steel. Compared with ferrite, the plasticity and toughness are higher, the no room temperature is crispy, and the corrosion resistance and welding performance of the crystal resistance are significantly improved. The 475 ℃ brittleness of the stainless steel and the high thermal conductivity, which has the characteristics of ultra -plasticity. Compared with the austenitic stainless steel, high strength and crystal corrosion and chloride stress corrosion have significantly improved. Two -phase stainless steel has excellent pore resistance and is also a kind of nickel -saving stainless steel. The precipitated hardening stainless steel, the substrate is Austeen or martensite tissue, and the commonly used cards for precipitated hardening stainless steel are available. It can handle stainless stainless steel through precipitating hardening (also known as timeliness) treatment. Martiner stainless steel, high strength, but poor plasticity and weldability. The commonly used grades of matewars stainless steel include 1CR13, 3CR13, etc. Because of high carbon content, it has high strength, hardness and abrasion resistance, but the corrosion resistance is slightly poor. Some parts are required, such as spring, turbine blades, water pressure machine valves, etc. These steels are used after quenching and recovery. After forging and stamping, you need to anneal. The pressure -stain steel steel plate and steel belt are used. Pressure containers are specifically used for stainless steel, which have clear requirements such as classification and code, size, shape and allowable deviation, technical requirements, testing methods, testing rules, packaging, signs and product quality certificates. The commonly used cards include, the number code is: S30408, S31603, etc. It is mainly used for sanitary equipment such as food machinery and pharmaceutical machinery.