What are the common types of heat treatment for stainless steel welded pipes

During the production process, stainless steel welded pipes can undergo intermediate heat treatment and finished product heat treatment. Because stainless steel welded pipes can achieve a bright surface without oxidation, the traditional pickling process is eliminated. This heat treatment process not only improves the quality of stainless steel welded pipes but also overcomes the environmental pollution caused by pickling.

According to current global development trends, bright continuous heat treatment furnaces for stainless steel welded pipes are basically divided into three types:
1. Roller hearth bright heat treatment furnace. This furnace is suitable for heat treating large batches of stainless steel welded pipes, with an hourly output exceeding 1.0t. High-purity hydrogen, ammonia, and other protective gases can be used. A convection system can be provided for the rapid cooling of the steel pipes.
2. Mesh belt bright heat treatment furnace. This type of furnace is suitable for small-diameter, thin-walled stainless steel welded pipes, with an hourly output of approximately 0.3~1.0t. The length of the treated stainless steel welded pipes can reach 40 meters, and it can also process coiled capillary tubes.
3. Muffle furnace type bright heat treatment furnace. Stainless steel welded pipes are mounted on a continuous handle frame and heated in a muffle tube. This process allows for the production of high-quality, small-diameter, thin-walled stainless steel welded pipes at a relatively low cost, with an hourly output of approximately 0.3 tons or more.

Stainless steel welded pipes require penetration, absence of oxide inclusions, and a minimal heat-affected zone. Tungsten inert gas shielded tungsten argon arc welding offers good adaptability, high weld quality, and excellent penetration performance. The products are widely used in the chemical, nuclear, and food industries.