Dual-phase gas valve steel strips are solution treated using high-frequency induction heating power supply. Overview of induction heating solution treatment

Dual-phase valve steel refers to a high-alloy heat-resistant steel with a two-phase structure of austenite and ferrite at room temperature. In order to meet the needs of work, dual-phase valve steel usually uses a high-frequency annealing power supply for heat treatment. Today, the editor will tell you about the induction heating solution treatment of dual-phase valve steel strips.

When hot rolling austenite and ferrite dual-phase valve steel, if the final rolling temperature and cooling rate are not controlled properly, the distribution of the two phases in the hot-rolled steel will be uneven, and the grain size will vary greatly. This difference in organizational state, coupled with the difference in structural properties between austenite and ferrite, converges to cause greater harm to the high-temperature plasticity of steel. When the end user is hot upsetting the valve body, the valve body blank Cracks will occur, resulting in a large amount of valve blank waste. For this reason, heat treatment must be used to make the two-phase structure of the steel reasonably distributed, to make the grain size uniform, and to make the hardness uniform to meet the requirements of the hot forging valve process.

There are two heat treatment methods to improve the high-temperature plasticity of dual-phase valve steel.

(1) Solid solution treatment This method is also called high temperature quenching method. After heating the steel to the single-phase austenite region, it is immediately quenched and cooled to obtain single-phase austenite. This single-phase austenite has a uniform structure and uniform properties, which significantly improves high-temperature hot working plasticity. Nowadays, solid solution treatment is mostly carried out using high-frequency induction heating power supply.

(2) Normalizing and high temperature tempering treatment. First, the steel is heated to the two-phase zone and then air-cooled, and then a high-frequency induction heating power supply is used for high-temperature tempering. For this treatment method, the normalizing heating temperature should be selected so that the austenite in the steel should reach more than 80% and the ferrite should be less than 20% before air cooling. If the phase ratio of austenite does not reach 80%, it will be difficult to obtain the heat treatment effect.

At present, solution treatment methods are mostly used to improve the high-temperature thermal processing plasticity of dual-phase valve steel. For solid solution treatment, high-frequency induction heating power is mostly used. If you want to know about its specific induction heating solid solution treatment process, you can read more books on heat treatment. I believe you will gain a lot.