25Cr2MoVA chemical composition and mechanical properties, main uses The heat conversion rate of it is over 98% so the temperature rises fast. It can reach the set temperature in short time after being charged with electricity. Moreover, when the set temperature is reached, it will cut off the electricity automatically. Ceiling Mounted Panel Heater,Ceiling Mounted Electric Panel Heater,Ceiling Mounted Heater,Wall Panel Infrared Heater Shandong Dexiang Electrical Technology Co.,Ltd , http://www.infraredroomheater.com
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25Cr2MoVA, alloy structural steel. Uniform digital code: A31253. Standard: GB/T3077-1999
Chemical composition C: 0.22 to 0.29 Si: 0.17 to 0.37 Mn: 0.40 to 0.70 Cr: 1.50 to 1.80
Mo: 0.25 to 0.35 V: 0.15 to 0.30
Performance [sample blank size] 25mm
[heat treatment]
Quenching heating temperature (°C): 900;
Coolant: oil tempering heating temperature (°C): 640;
Coolant: empty
[Mechanical properties]
Tensile strength (σb/MPa): ≧ 930
Yield point (σs/MPa): ≧785
Elongation after break (δ5/%): ≧14
Area shrinkage (ψ/%): ≧55
Impact absorption work (Aku2/J): ≧63
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≦241
The main characteristics of medium carbon heat resistant steel. Both strength and toughness are high. When the temperature is lower than 500 ° C, the high temperature performance is good, there is no tendency to be hot and brittle, the hardenability is good, the machinability is good, the cold deformation plasticity is medium, and the weldability is poor. Generally used in quenched and tempered state, can also be used after normalizing and high temperature tempering.
Application examples for the manufacture of nuts (less than or equal to 550 ° C), bolts, studs (less than 530 ° C) under high temperature conditions, fasteners with long-term operating temperature to 510 ° C, turbine rotor, sleeve, main steam valve, The regulating valve can also be used as a nitriding steel to make valve stems, gears and the like.
The origin of the name of 25Cr2MoVA The two digits at the beginning of the steel number indicate the carbon content of the steel, expressed as a few tenths of the average carbon content. For example, the main alloying elements in the 40Cr, 25Cr2MoVA alloy tube 2 steel, except for the individual microalloying elements, generally A few percent said. When the average alloy content is <1.5%, the steel symbol is generally only marked with the symbol of the element, and the content is not indicated, but in the special case, it is easy to cause confusion. The element symbol can also be marked with the number "1", for example, the steel number. "12CrMoV" and "12Cr1MoV", the former has a chromium content of 0.4-0.6%, the latter has a 0.9-1.2%, and the remaining components are all the same. When the average content of alloying elements is ≥1.5%, ≥2.5%, ≥3.5%..., the content should be indicated after the element symbol, which can be expressed as 2, 3, 4, etc. For example, 18Cr2Ni4WA. The alloying elements such as vanadium V, titanium Ti, aluminum AL, boron B, and rare earth RE in steel are all microalloying elements. Although the content is very low, they should be marked in the steel number. For example, in 20MnVB steel. The vanadium is 0.07-0.12% and the boron is 0.001-0.005%. 4 high-quality steel should be added "A" at the end of the steel to distinguish it from ordinary high-quality steel. 5 Special purpose alloy structural steel, steel crown with (or suffix) represents the symbol of the use of the steel. For example, 30CrMnSi steel for rivet screw, steel grade is expressed as ML30CrMnSi. Alloy tubes and seamless tubes have both a relationship and a difference, and cannot be confused. The alloy pipe is defined by the production material (that is, the material). As the name implies, it is the pipe made of alloy; and the seamless pipe is defined by the production process (seamless seamless), which is different from the seamless pipe. There are seam pipes, including straight seam welded pipes and spiral pipes. 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
The temperature of the screen can maintain 80 degree so it is very safe for the customers. Besides,it is safe to children and pets.(Different sizes correspond to different power)