Decarburization problem on the surface of stainless steel pipes
Jan 10,2022
The service life of stainless steel pipe products is related to the degree of decarburization on the surface of the steel products. For example, the service life of a steel wire rope mainly depends on its fatigue strength and wear resistance. If the outer surface of the steel wire rope is decarburized and exceeds the limit, it will reduce the carbides in the surface layer that serve as strengthening and wear-resistant phases, thus directly affecting these two performance indicators. In addition, if the decarburization layer on the outer surface of tool steel and bearing steel is not thoroughly removed and cleaned, the hardness and wear resistance of the outer surface of tool steel and bearing steel will decrease, and during quenching, cracks will form on the surface of the workpiece due to different changes in the volume of the inner and outer layers. Therefore, how to avoid decarburization on the surface of stainless steel pipe products is a problem that should be paid attention to in the production process. The decarburization layer of imported wire rods from abroad is 0.02~0.04mm, while the surface of wire rods from Kobe, Japan can achieve no decarburization, while similar domestic products have a uniform decarburization layer depth exceeding 0.05mm. Methods need to be selected to modify this situation.
The key to dealing with decarburization on the surface of stainless steel pipes lies in the heat treatment process. Because decarburization and oxidation of steel wire occur simultaneously, the intention of improving decarburization can be achieved by minimizing the contact of steel wire with air during the heat treatment process. For example, the American Spring Steel Wire Company used double lead groove oil quenching and tempering to treat the steel wire for valve springs, achieving interesting results. The production process is as follows: a molten lead tank is used to austenitize the steel wire, and the lead liquid is heated to 871 ℃ in advance. The stainless steel tube passes through the lead liquid to complete austenitization, and then enters the oil tank for quenching, and then enters the second molten lead tank for tempering (482 ℃). Because steel wire does not come into contact with air in molten lead, it effectively avoids decarburization. The primary issue in selecting this process requirement is how to avoid lead dust pollution.
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TEL：+86 0510 8989 9999
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