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317 stainless steel strip

In 316 and 317 stainless steel containing molybdenum stainless steel kind is. In 317 stainless steel molybdenum content a little wiser than 316 stainless steel. Because of molybdenum in steel, the overall performance is better than the 310 steel and 304 stainless steel, high temperature conditions, when sulfate concentrations below 15% and above 85%, 316 stainless steel has a wide range of uses. 316 stainless steel has good and chloride erosion performance, so often used in marine environments.

Stainless steel 316L maximum carbon content of 0.03, can be used for welding can not be carried out after annealing and the need for maximum corrosion resistance applications.

Corrosion resistance: corrosion resistance is superior to 304 stainless steel, in the pulp and paper production process has good corrosion resistant performance. And 316 stainless steel is also resistant to marine and industrial atmospheric erosion erosion.

Heat resistance: 1600 degrees in the following intermittent use and 1700 degrees in the following continuous use, 316 stainless steel has good oxidation resistance performance: in the 800-1575 range, it is best not to continuous 316 stainless steel, but in which the temperature is outside the scope of the continuous use of 316 stainless steel, the stainless steel has good heat resistance. 316L stainless steel resistant to precipitation of carbide better performance than the 316 stainless steel, the temperature range available.

Heat treatment: in 1850-2050 temperature range and rapid annealing, annealing, and then rapidly cooling. 316 stainless steel can not heat treatment hardening.

Welding: 316 stainless steel has a good welding performance. Can use all of the standard welding method welding. Welding according to the uses, respectively, using 316Cb, 316L or 309Cb stainless steel filler rod or rods for welding. In order to obtain the best corrosion resistance, stainless steel 316 welded section need annealing after welding processing. If you use the 316L stainless steel, without the need for welding after annealing treatment.

317 stainless steel with typical use: pulp and paper equipment heat exchanger, dyeing equipment, film equipment, pipeline, the exterior of the building materials used in coastal areas.

The physical properties of stainless steel

One, general physical properties

And other materials, physical properties including the following 3 aspects: melting point, heat capacity, thermal conductivity and linear expansion coefficient and other thermodynamic properties, resistivity, conductivity and permeability, electromagnetism, and Young's modulus of elasticity, stiffness coefficient, mechanical properties. These properties are generally considered to be the inherent characteristics of stainless steel material, but also can be affected by temperature, such as the degree of processing and magnetic field strength and so on. Typically stainless steel and iron compared with low thermal conductivity, resistance, and linear expansion coefficient and permeability properties of the crystalline structure in stainless steel itself varies.

Table 4 - 1 Table 4 - 5 lists martensitic stainless steel, ferrite stainless steel, austenitic stainless steel, precipitation hardening stainless steel and double phase stainless steel main grades of physical properties. Such as melting point, density, specific heat capacity, thermal conductivity, coefficient of linear expansion, resistivity, permeability and longitudinal elastic coefficient.

In two, the physical properties and temperature dependence

( 1) specific heat capacity

With the change of temperature specific heat capacity changes, but the changes in temperature of the metal in the process of organization once the phase change or precipitation, then will change remarkably specific heat capacity.

( 2) thermal conductivity

In 600 DEG C, all kinds of stainless steel thermal conductivity in 10 ~ 30W / ( M C ) range, with the increase in temperature coefficient of thermal conductivity is increased. At 100 degrees C, stainless steel thermal conductivity from big to small order of 1Cr17, 00Cr12, 2 Cr, 0 25N Cr 18Ni11Ti, 0 Cr 18 Ni 0 Cr 17 Ni 9, 12M 2, Cr 25Ni20 2. At 500 degrees C thermal conductivity from big to small order for 1 Cr 13, 1 Cr 17, 2 Cr 25N, 0 Cr, 0 Cr 17Ni12M 2 18Ni9Ti and 2 Cr 25Ni20. Austenitic stainless steel thermal conductivity is other stainless steel is slightly lower, compared with plain carbon steel, 100 degrees C austenitic stainless steel thermal conductivity is about 1 / 4.

( 3) linear expansion coefficient

In the 100-900 range, all kinds of stainless steel main brands of linear expansion coefficient of basic in 10. 6 ~ 130 * 10 and 6 degrees C and 1, with the increase of temperature increased. For precipitation hardening stainless steel, coefficient of linear expansion of aging temperatures to determine the size of.

( 4) resistivity

In 0 ~ 900 degrees, all kinds of stainless steel main brands than the size of resistance in 70 * 10 and 6 * 10 and 6 ~ 130 m and 5, and along with the increase of temperature had an increasing trend. When used as heating material, should choose the material with low resistivity.

( 5) permeability

Austenitic stainless steel magnetic permeability minima, also known as the non magnetic materials. With a stable austenitic organization of steel, such as 0 Cr 20 Ni 10, 0 Cr 25 Ni 20, even for the more than 80% large deformation processing will not take magnetic.

The physical properties of stainless steel

Carbon, high nitrogen, high manganese austenitic stainless steel, such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N series as well as high manganese austenitic stainless steel, in a large reduction of processing conditions to occur with the phase transition, thus maintaining the magnetic. In Curie point above the high temperature, even the strong magnetic material will be the loss of magnetic. But some austenitic stainless steel such as 1Cr17Ni7, 0Cr18Ni9, because its organization into a metastable austenite, thus the big reduction cold processing or low temperature processing can occur when the martensitic transformation, will itself has a magnetic and magnetic permeability will improve.

( 6) the elastic modulus

Room temperature of ferritic stainless steel longitudinal elastic modulus of 200kN / mm2, austenitic stainless steel longitudinal elastic modulus is 193 kN / mm2, slightly lower than the carbon structure steel. With the increase of temperature of longitudinal elastic modulus Poisson ratio increases, decreases, transverse elastic modulus ( rigid ) showed significant decrease. Modulus of longitudinal elasticity will be on the hardening and tissue collection effect.

( 7) density

High chromium content of ferritic stainless steel small density, high nickel content and the content of Mn high austenitic stainless steel in high temperature high density, because of the character spacing increase the density gets smaller.