In 2004, the American Valve Association announced that the United States domestic valve market share reached 3.18 billion US dollars; according to China General Machinery Association data, China's valve market exceeded 20 billion yuan, by 2010, China's domestic demand for valves will reach 34.5 billion yuan. The sales of various types of valves in the global market are around US$40 billion. There are more than 2,000 valve manufacturers in China, plus more than 1,400 valve manufacturers in other developed and developing countries, accounting for 80% of the global market share; another 10 valve joint companies occupy 20% of the global market Share.
There are many types of valves and they are widely used. The petroleum and natural gas industries have always been the biggest buyers in the valve market. The largest amount of petroleum (including oil refining) and natural gas fields accounted for 37.4% of the total; the amount of valves in the energy sector was 21.3%; the third was in the chemical industry, which was 11.5%; followed by water treatment and sewage treatment, 11.4 %.
1.Wear-resisting Steel Plate is composed of low Carbon Steel Plate and alloy wear-resisting layer. When working, the matrix provides comprehensive properties such as strength, toughness and plasticity of resisting external forces, and the alloy wear-resistant layer provides wear-resistant properties that meet the requirements of specified working conditions.
2.Wear-resisting steel alloy wear-resisting layer and base plate are metallurgical combination. By means of special equipment and automatic welding process, the high-hardness self-protecting alloy wire is uniformly welded on the substrate, and the composite layers are one to two or even more. In the composite process, due to the different shrinkage ratio of the alloy, uniform transverse cracks appear, which is a significant feature of the wear-resistant steel plate.
3.The wear resistant layer of the alloy is mainly chromium alloy, while manganese, molybdenum, niobium, nickel and other alloys are added. The microhardness of carbide can reach above hv1700-2000, and the surface hardness can reach hrc58-62. Carbide alloy has a strong stability at high temperature, maintain a high hardness, but also has a good oxidation resistance, within 500℃ completely normal use.
4.The wear-resistant layer has narrow channel (2.5-3.5mm), wide channel (8-12mm), curve (S, W), etc. It is mainly composed of chromium alloy, while manganese, molybdenum, niobium, nickel, boron and other alloy components are added. With 40-60% carbide content, the microhardness can reach above HV1700 and the surface hardness can reach hrc58-62.
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