What is a stainless steel belt
What is a stainless steel belt?
Stainless steel belt is simply an extension of ultra-thin stainless steel plate. It is mainly a narrow and long steel plate produced to meet the needs of industrialized production of various metal or mechanical products in different industrial sectors.
Classification of stainless steel strip
There are many kinds of stainless steel belts with wide applications: 201 stainless steel belt, 202 stainless steel belt, 304 stainless steel belt, 301 stainless steel belt, 302 stainless steel belt, 303 stainless steel belt, 316 stainless steel belt, J4 stainless steel belt, 309S stainless steel belt, 316L stainless steel belt, 317L stainless steel belt, 310S stainless steel belt, 430 stainless steel iron belt, etc! Thickness: 0.02mm-4mm, width: 3.5mm-1550mm, can be customized without standard!
Stainless steel with domestic (imported) stainless steel belt: stainless steel coil belt, stainless steel spring belt, stainless steel stamping belt, stainless steel precision belt, stainless steel mirror belt, stainless steel cold rolling belt, stainless steel hot rolling belt, stainless steel etching belt, stainless steel stretching belt, stainless steel polishing belt, stainless steel soft belt, stainless steel hard belt, stainless steel medium hard belt, stainless steel high temperature resistant belt, etc.
Cold rolled strip
- ① With “stainless steel strip/coil” as raw material, it is rolled by cold rolling mill at room temperature. Conventional thickness < 0.1mm ~ 3mm >, width < 100mm ~ 2000mm >;
- ② “Cold rolled steel strip/coil” has the advantages of smooth and smooth surface, high dimensional accuracy and good mechanical properties. Most products are rolled and can be processed into coated steel plate;
- ③ Production process of cold rolled stainless steel strip/coil: 1. pickling → 2. normal temperature rolling → 3. process lubrication → 4. annealing → 5. leveling → 6. fine cutting → 7. packaging → 8. reaching customers.
Hot rolled strip
- ① Strip steel with thickness of 1.80mm-6.00mm and width of 50mm-1200mm is made by hot rolling mill.
- ② Hot rolled strip/sheet has the advantages of low hardness, easy processing and good ductility.
- ③ Production process of hot rolled stainless steel strip/coil: 1. Pickling → 2. High temperature rolling → 3. Process lubrication → 4. Annealing → 5. Leveling → ⒍ fine cutting → ⒎ packaging → 8. Reaching customers.
Difference between hot and cold
- ① The cold-rolled steel strip has good strength and yield ratio, and the hot-rolled steel strip has good ductility and toughness.
- ② The surface quality, appearance and dimensional accuracy of cold rolled steel strip are better than those of hot rolled plate.
- ③ The thickness of cold rolled steel strip is ultra-thin, and the thickness of hot rolled steel strip is large.
Silicon steel strip
Grain oriented silicon steel strip, also known as cold rolled silicon steel strip for telecommunications industry, is a silicon steel strip with grain oriented structure and thickness of no more than 0.20mm, which is used to manufacture various power transformers, pulse transformers, magnetic amplifiers, converters and other iron cores with working frequency above 400Hz.
Structural steel strip
Delivered in heat treatment (annealing, normalizing, tempering after normalizing, high temperature tempering).
The steel strip can be delivered without heat treatment under the condition that all properties meet the standard requirements. Ordinary drawing grade steel strip is allowed to be delivered without heat treatment.
Cold rolled steel strip shall be delivered in the state of heat treatment (annealing, normalizing and tempering after normalizing), and shall be delivered smoothly.
Usage: it is widely used in automobile industry, aviation industry and other departments.
Properties of stainless steel strip
Like other materials, the physical properties of stainless steel strip mainly include the following three aspects: thermodynamic properties such as melting point, specific heat capacity, thermal conductivity and linear expansion coefficient, electromagnetic properties such as resistivity, conductivity and permeability, and mechanical properties such as young’s modulus of elasticity and rigidity coefficient. These properties are generally considered to be the inherent characteristics of stainless steel, but they are also affected by temperature, processing degree and magnetic field strength. Generally, compared with pure iron, stainless steel has low thermal conductivity and high resistance, while the linear expansion coefficient and permeability vary according to the crystal structure of stainless steel.
Correlation between physical properties and temperature
(1) Specific heat capacity
With the change of temperature, the specific heat capacity will change, but in the process of temperature change, once phase transformation or precipitation occurs in the metal structure, the specific heat capacity will change significantly.
(2) Thermal conductivity
Below 600 ℃, the thermal conductivity of various stainless steels is basically in the range of 10 ~ 30W/(m · ℃), and the thermal conductivity tends to increase with the increase of temperature. At 100 ℃, the order of thermal conductivity of stainless steel is 1Cr17, 00Cr12, 2Cr25N, 0cr18ni11ti, 0Cr18Ni9 and 0cr17ni12m ο 2、2Cr25Ni20. At 500 ℃, the order of thermal conductivity from large to small is 1Cr13, 1Cr17, 2Cr25N and 0cr17ni12m ο 2. 0Cr18Ni9Ti and 2cr25ni20. The thermal conductivity of austenitic stainless steel is slightly lower than that of other stainless steels. Compared with ordinary carbon steel, the thermal conductivity of austenitic stainless steel is about 1/4 at 100 ℃.
(3) Coefficient of linear expansion
In the range of 100-900 ℃, the linear expansion coefficient of main grades of various stainless steels is basically 10 ˉ 6~130*10 ˉ 6℃ ˉ 1, and showed an increasing trend with the increase of temperature. For precipitation hardening stainless steel, the linear expansion coefficient is determined by aging treatment temperature.
At 0 ~ 900 ℃, the specific resistance of main grades of stainless steel is basically 70 * 10 ˉ 6~130*10 ˉ 6 Ω· m, and it tends to increase with the increase of temperature. When used as heating materials, materials with low resistivity shall be selected.
Austenitic stainless steel has very low permeability, so it is also called non-magnetic material. Steels with stable austenite structure, such as 0cr20ni10 and 0Cr25Ni20, will not be magnetic even if they are processed with large deformation greater than 80%. In addition, high carbon, high nitrogen and high manganese austenitic stainless steels, such as 1cr17mn6nisn, 1Cr18Mn8Ni5N series and high manganese austenitic stainless steels, will occur under the condition of large reduction ε phase transition, so it remains non-magnetic. At high temperatures above the Curie point, even strong magnetic materials will lose their magnetism. However, some austenitic stainless steels, such as 1cr17ni7 and 0Cr18Ni9, have metastable austenite structure. Therefore, martensitic transformation will occur during large reduction cold working or low-temperature processing, which will be magnetic and the permeability will be improved.
(6) Elastic modulus
At room temperature, the longitudinal elastic modulus of ferritic stainless steel is 200KN/mm2 and that of austenitic stainless steel is 193KN/mm2, which is slightly lower than that of carbon structural steel. With the increase of temperature, the longitudinal elastic modulus decreases, the Poisson’s ratio increases, and the transverse elastic modulus (stiffness) decreases significantly. The longitudinal elastic modulus will have an effect on work hardening and tissue aggregation.
Ferritic stainless steel with high chromium content has low density, while austenitic stainless steel with high nickel content and high manganese content has high density. At high temperature, the density becomes smaller due to the increase of character spacing.
Physical properties at low temperature
(1) Thermal conductivity
The thermal conductivity of various stainless steels at very low temperature is slightly different, but generally speaking, the thermal conductivity is about 1/50 of that at room temperature. At low temperature, the thermal conductivity increases with the increase of magnetic flux (magnetic flux density).
(2) Specific heat capacity
At very low temperatures, there are some differences in the specific heat capacity of various stainless steels. The specific heat capacity is greatly affected by temperature. The specific heat capacity at 4K can be reduced to less than 1/100 of that at room temperature.
(3) Thermal expansion
For austenitic stainless steel, the shrinkage below 80K (relative to 273k) is slightly different. The content of nickel has a certain effect on the shrinkage.
At very low temperature, the difference of resistivity between brands increases. Alloy elements have a great influence on the resistivity.
At low temperature, the effect of mass susceptibility of austenitic stainless steel on load magnetic field is different with different materials. The content of different alloying elements is also different.
There is no difference in permeability between different brands.
(6) Elastic modulus
The Poisson’s ratio of austenitic stainless steel with magnetic transformation has an extreme value at low temperature.
Source: Network Arrangement – China Stainless Steel Strip Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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