Solid-solution method of stainless steel bent pipe fitting and device thereof

Abstract

The invention discloses a solid-solution method of a stainless steel bent pipe fitting and a device thereof. The method comprises the following steps of: (1) clamping a bent part of the stainless steel bent pipe fitting in a round channel encircled by an upper mold and a lower mold; (2) heating the stainless steel bent pipe fitting by using a high-frequency voltage to a solid-solution temperature for full solid-solution; (3) cutting off the high-frequency voltage output, injecting cooling water into the stainless steel bent pipe fitting, and keeping the cooling water to flow in the stainless steel bent pipe fitting at a velocity of 1.2-1.8m / s; and (4) when the stainless steel bent pipe fitting is cooled till the temperature is not changed, stopping injecting water, removing an electrode and a water injection pipe, opening the upper mold and the lower mold and taking out the stainless steel bent pipe fitting. The solid-solution method disclosed by the invention can be suitable for solid-solution treatment of the stainless steel bent pipe fitting, so that the performance of the treated stainless steel bent pipe fitting is optimized, and meanwhile, the stress can be also fully removed, so that deformation of the pipe fitting is avoided.

Description

technical field [0001] The invention relates to a processing method and device for a pipe fitting, in particular to a solid solution method and a device for a stainless steel elbow pipe fitting. Background technique [0002] The so-called solid solution treatment refers to heating the alloy to a temperature at which the second phase can completely or maximally dissolve into the solid solution. process. [0003] The solubility of carbon in austenitic stainless steel is greatly affected by temperature. When the austenitic stainless steel is in the temperature range of 400 ° C ~ 850 ° C, high chromium carbides will precipitate. When the chromium content falls below the corrosion resistance limit, there is a lack of chromium at the grain boundary, which will cause intergranular corrosion. , can turn into powder in severe cases. Therefore, austenitic stainless steel with intergranular corrosion tendency should be solution heat treated or stabilized. [0004] The specific solu...

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Problems solved by technology

This treatment method is usually applicable to conventional straight pipe fittings. Since the bending parts of stainless steel pipe elbow fittings will undergo stress changes when heated, after solution treatment, the problem of deformation of the bending parts is extremely prone to occur.

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