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The Structure and Annealing Process of Bright Annealing Furnace for Stainless Steel Tubes

1. The structure of the bright annealing furnace for stainless steel tubes

The bright annealing furnace for stainless steel tubes is mainly composed of heating furnace body, stainless steel muffle tank, conveying steel belt (or mesh belt) and conveying mechanism. The heating element is made of high-quality high-resistance alloy material 0Cr27Al7Mo2, with low surface load and high temperature resistance, quick and convenient installation and maintenance, and will not form a thermal short circuit with the furnace shell. The heating temperature can reach 1100℃, the muffle tank is made of high temperature resistant stainless steel plate (310S, thickness 8mm) by bending and welding; the outlet is connected with a water cooling device, under the protection of ammonia decomposition atmosphere, the annealing tube is removed from the muffle tank Pass and heat. The heating furnace body has a split structure, which is divided into an upper cover and a furnace base. The upper cover can be opened for easy maintenance.

2. The annealing process of the bright annealing furnace for stainless steel tubes

In order to quickly cool the bright annealed stainless steel tube, the annealing tube enters the cooling section after passing through the heating section. The cooling section adopts indirect water jacket cooling. The muffle tank is also set inside and protected by ammonia decomposition atmosphere, so that the annealed tube is bright without oxidation.

Under the action of a catalyst, liquid ammonia is heated and decomposed to obtain 75% hydrogen and 25% nitrogen. The mixed gas of hydrogen and nitrogen is a flammable gas. It can burn in the presence of air and emits a lot of heat, so it is in use The process must be strictly controlled. In order to ensure the performance of the bright annealing furnace for stainless steel tubes, it is necessary to inspect the purchased raw material ammonia to ensure that the various technical indicators meet the furnace liquid ammonia standard, and the fluctuation value of liquid ammonia filling pressure is required to be within the range of ±5% to ensure safety. Strictly implement the liquid ammonia decomposition and refining operating procedures, adjust and monitor the specified process parameters, and observe the quality of the annealed stainless steel pipe at any time, and adjust and deal with the problem in time to prevent misoperation from causing pipe quality accidents. Control the residual ammonia content in the decomposed ammonia. Reasons for excessive residual ammonia in decomposed ammonia:

(1) The decomposition temperature is too low.

(2) Overload production.

(3) Decline or failure of catalyst activity.

(4) The reaction tank (furnace) leaks, and ammonia gas seeps into the decomposed ammonia.

In order to ensure the quality, all steel pipes of HUASHANG have undergone 100% PMI, 100% hydraulic test, 100% sponge internal cleaning, 100% size test and 100% surface test. In addition, the quality of our precision drawn tubes is the same as that of precision rolling, but the price is more advantageous. We use advanced cold-drawing technology from Japan and Korea for precise dimensional control. HUASHANG provides discounted bright annealed stainless steel tubes for instrument tubes, chromatography tubes, hydraulic tubes, high-pressure tubes, clean tubes, and multi-core tubes. For purchasing stainless steel pipes, HUASHANG is your best choice!

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