Wear-resistant steel plate is wear-resistant steel plate in the brightness of a brighter type of steel pipe, wear-resistant steel plate hardness, the use of the scope is relatively wide, in almost engineering and machinery industry are able to carry out the realization. Wear-resistant steel plate performance is relatively good, the most direct reason for the wide range of uses is that the density is relatively large, its density is higher than wear-resistant steel plate and wear-resistant steel plate of certain materials are high, it is because of its density is relatively large, which led to the wear-resistant steel plate hardness is relatively large.
Wear-resistant steel plate is generally used steel density is 7.85kg/dm3. wear-resistant steel plate has a hollow cross-section, a large number of used as a pipeline for transporting fluids, such as pipelines for transporting petroleum, natural gas, coal gas, water and certain solid materials. Compared with round steel and other solid steel, steel pipe is lighter in bending and torsion strength is the same, is a kind of economic cross-section steel, is widely used in the manufacture of structural and mechanical parts, such as oil drilling rods, automobile drive shafts, bicycle frames, and steel scaffolding used in building construction, etc. Use of steel pipe to manufacture annular parts, can improve the material utilization rate, simplify the manufacturing process, save materials and machining hours, has been widely used in the manufacture of steel pipe.
Wear-resistant steel plate quenching to get martensitic organization, tempered at 450 ~ 600 ℃ temperature range; or tempered at 650 ℃ after a slow cooling rate after 350 ~ 600 ℃; or tempered at 650 ℃, in the temperature range of 350 ~ 650 ℃ for a long time after the heating, all so that the wear-resistant steel plate to produce embrittlement phenomenon If has been embrittlement of the 20 # wear-resistant steel plate reheated to 650 ℃ and then fast cooling, you can Recovery of toughness, so it is also known as %26ldquo; reversible tempering embrittlement %26rdquo; high temperature tempering embrittlement manifests itself as a wear-resistant steel plate toughness a brittle transformation temperature increases. High temperature tempering embrittlement. Sensitivity is generally expressed as the difference between the toughness of the toughened state and the brittle state of the toughness a brittle transition temperature (%26Delta;T). The more serious the brittleness of high temperature tempering, the higher the proportion of along-crystal fracture on the fracture of wear-resistant steel plate.
The role of elements in the wear-resistant steel plate on high temperature temper brittleness is divided into: (1) impurity elements such as phosphorus, tin, antimony, etc., which trigger the high temperature temper brittleness of the wear-resistant steel plate. (2) in different forms, different degrees to promote or slow down the high temperature tempering embrittlement of alloying elements. There are chromium, manganese, nickel, silicon, etc. to promote the role of molybdenum, tungsten, titanium, etc. to delay the role. Carbon also plays a promotional role. General carbon wear-resistant steel plate to high temperature tempering brittleness is not. Sensitive, containing chromium, manganese, nickel, silicon binary or multiple alloy steel is very sensitive, the degree of sensitivity depends on the type and content of alloying elements.
