Iron-base alloy powder for high-pressure valve sealing surface weld deposit

Abstract

The invention discloses iron base alloy powder for overlaying welding of the sealing surface of a high pressure valve. The iron base alloy powder comprises the following components with the weight portions of 18-24 percent of Cr, 4-6 percent of Mo, 13 percent of Ni, 4-5 percent of Si, 1-2 percent of B, equal to or less than 0.15 percent of C, and Fe for the rest. The beneficial effects of the invention are (1) low cost, (2) good technological properties and (3) high hardness. The invention adopts the iron base alloy powder to replace the cobalt base alloy powder. The price of the iron base alloy powder is much lower than the price of the cobalt base alloy powder. The iron base alloy powder can replace Stellite No. 6 cobalt base alloy powder, and has the advantages of low cost and high properties. The welding technology of the iron base alloy powder is more advanced than the welding technology of the Stellite No. 6 cobalt base alloy powder. The Stellite No. 6 cobalt base alloy powder needs to preheat the overlaying welding base before overlaying welding, or the welding seam will split open. The overlaying welding base of the invention does not need to be preheated. The iron base alloy powder has good overlaying welding properties, has simple technologies, and is easy to be operated. After being welded and cooled to room temperature, the hardness HRC of the iron base alloy powder is 39. The hardness under 560 centigrade in a furnace is higher than the hardness under room temperature. The iron base alloy powder has sedimentation and hardening functions.

Description

technical field [0001] The invention relates to metal alloy powder, in particular to iron-based alloy powder for surfacing welding of sealing surfaces of high-pressure valves. Background technique [0002] At present, in the existing technology, Stellite No. 6 cobalt-based alloy powder is commonly used for surfacing welding of the sealing surface of high-pressure valves, because the sealing surface of high-pressure valves itself requires high-temperature and wear-resistant performance, and cobalt-based alloy powder belongs to high-temperature and wear-resistant materials, such as The internationally recognized Stellite No. 6 cobalt-based alloy powder has good high temperature and wear resistance. However, due to the lack of cobalt raw materials in my country and its high price, its use is limited. Therefore, industrial and mining enterprises are eager to produce a low-cost, high-quality, high-temperature and wear-resistant material to replace cobalt-based alloy powder to mee...

AI Technical Summary

Problems solved by technology

However, due to the lack of cobalt raw materials in my country and its high price, its use is limited. Therefore, industrial and mining enterprises are very eager to replace cobalt