Year1
- 规格：
- 0.35*300
- 表面：
- 光亮
- 硬度：
- 28-35
Because it contains high nickel and has an austenite single-phase structure at room temperature, it has a high It has excellent corrosion resistance, high plasticity and toughness at low temperature, room temperature and high temperature, as well as good cold work forming and weldability. However, the strength at room temperature is low, the tendency of intergranular corrosion and stress corrosion is greater, and the cutting processability is poor. Austenite does not undergo phase transformation when heated and therefore cannot be strengthened by heat treatment. Heat treatment can only be carried out to improve the corrosion resistance of steel
Uses
Stainless steel is widely used in the production of equipment and parts with corrosion resistance and formability due to its good heat resistance. At present, stainless steel has been widely used in food, chemical industry, atomic energy and other industrial equipment and decoration fields, as well as household products, cabinets, indoor pipelines, water heaters, boilers, bathtubs, auto parts, medical equipment, building materials, chemistry, food industry, agriculture, and ships. part.
Heat treatment specifications solid solution ~ ℃ rapid cooling.
The metallographic structure is characterized by austenitic structure.
That is/stainless steel. The brand name is (new standard).
It is a Japanese standard material and a Japanese series austenitic stainless steel. Equivalent to those in my country and the United States
Features
It has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, no heat treatment hardening phenomenon, and no magnetism.
Heat treatment
Solid solution treatment
The purpose is to fully dissolve the carbides and retain them in austenite at room temperature, thereby obtaining
single-phase austenite structure at room temperature. , giving steel the highest corrosion resistance.
The heating temperature of solid solution treatment is generally higher, between ℃ and adjusted appropriately according to the carbon content. Since stainless steel has poor thermal conductivity, not only must it be preheated before quenching and heating, but the heat preservation time during solution treatment (quenching and heating) must be long. During solid solution treatment, special attention should be paid to preventing carbonization. Because adding carburization will increase the tendency of intergranular corrosion of steel. The cooling medium generally uses clean water. The structure after solution treatment is generally single-phase austenite, but stainless steel containing titanium, niobium, and molybdenum, especially when it is a casting, also contains a small amount of ferrite. The hardness after solution treatment is generally around 10%.
Stress Relief Annealing
In order to eliminate the residual stress after cold working, the treatment is carried out at a lower temperature. It is generally heated to ℃, and ℃ is often used. For steels that do not contain titanium or niobium, the temperature should not exceed ℃ to avoid the precipitation of chromium carbide and cause intergranular corrosion.
In order to eliminate the residual stress after welding and eliminate the sensitivity of steel to stress corrosion, the treatment is generally performed at a higher temperature. The heating temperature is generally not lower than ℃. Cooling method: For steel containing titanium or niobium, it can be cooled directly in the air. For steel not containing titanium or niobium, it should be water-cooled to ℃ and then cooled in the air.
Stabilization treatment
In order to prevent the intergranular corrosion resistance of titanium and niobium austenitic stainless steel from decreasing due to the decrease in welding or solution treatment, this stainless steel needs to be heated to a certain temperature. Then (this temperature makes the chromium carbide completely dissolved in austenite, and only partially dissolved) and then slowly cooled. During the cooling process, the carbon in the steel is fully combined with titanium and niobium to precipitate stable chromium carbides without precipitating chromium carbides, thereby eliminating the intergranular corrosion tendency of austenitic stainless steel. This process is called stabilization.
Stabilized annealing of stainless steel is generally heated to ℃, kept warm, and then air-cooled or furnace-cooled.
Physical and chemical properties
Chemical composition
Carbon
Silicon
Chromium.
Manganese
Nickel.
Phosphorus
Sulfur< br/> Mechanical Properties
Yield Strength.
Tensile Strength
Elongation%
Hardness&
Young’s Modulus
Hardening Index
Thickness anisotropy index
Density.
Specific heat (℃).
Thermal conductivity/(℃) (at the following temperature/℃)
Linear expansion coefficient/(/℃) (between the following temperatures/℃)
~ ~ ~ ~
Resistivity.
Melting point ~℃
Characteristic differences
Description
Both are made of stainless steel, but have different compositions. and are called in Japan, while in China they are called respectively. In China, international chemical element symbols and national symbols are used to represent chemical ingredients, and Arabic letters are used to express ingredient content. The difference in chemical ingredients between the two can be seen from the structural formula. These two anti-corrosion capabilities are very good, but compared with the better related materials, the experimental data shows that stainless steel also rusts after a 2-hour salt spray test. In other cases, to achieve a good anti-corrosion effect, anti-rust oil can be applied , but the effect is limited and it is inconvenient for production and installation. It mainly depends on what effect you want to achieve and what kind of materials you choose. Currently, the relatively standard order is ordinary blue and white zinc-plated carbon steel & black zinc-plated carbon steel & nickel-plated carbon. Steel & Stainless Steel.
Differences
Both are low carbon steels, the main difference is that the carbon content is different
The carbon content is about .%
The carbon content is about .%.
In fact, the sulfur content is also much smaller than that of .
..
Comparison
The method of expressing steel number is roughly consistent with the method of expressing combined steel number. The carbon content is expressed as the average carbon content value.
The old brand representation method generally does not indicate the average carbon content. If necessary, it will be expressed by the average carbon content value [%]⒊. For ultra-low carbon steel, it will be expressed by. The new and old steel grades are shown in the table below.
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