Carbon steel gate Industrial Valves sealing surface of the heat treatment is to point to chromium cobalt tungsten carbide surfacing carbon steel valve body and disc sealing surface heat treatment. Carbon steel gate valve surfacing welding tungsten cobalt chromium carbide seal face, must carry on the stress relieving, its main purpose is to remove welding residual stress, improve the machining performance. On substrate for carbon steel gate valve surfacing CoCrW carbide, SF - 4 ( 137). Alloy spray welding WF330 or Fe30 parts, the stress relieving heating temperature according to carbon steel substrate material selected, generally USES 600 ~ 650 ℃. Heat preservation time depends on the effective thickness of parts, generally in 1 h / 25 mm, at least 2 h. Heat preservation with furnace cooling to 300 ℃ after out air cooling. Because carbon steel gate valve applicable medium is different, you can choose different surfacing welding seal face material. Suitable for water, steam, oil and its products are gate Industrial Valves, general welding Cr13 stainless steel, but also some factory surfacing chromium manganese alloy ( Alloy 85 or 137 alloy) And iron base alloy, copper alloy. Surfacing materials according to the effect of different heat treatment can be divided into two categories. Type represented by chromium cobalt tungsten carbide, general can change with heat treatment, the hardness of sealing surface hardness by surfacing welding material guarantee. Another represented by Cr13 stainless steel, the hardness can be changed with heat treatment, the hardness of sealing surface ( General requirements 38 ~ 44 HRC) Can be achieved through heat treatment. Guangzhou crane valve Industrial Valves construction industry is committed to environmental protection and the energy industry. Energy saving and environmental protection. Reputation crane valves main application areas: water treatment, sewage sludge treatment, flue gas desulfurization denitration, air purification, three wastes management.
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