Effect of solid solution on stainless steel flanges and pipe fittings

For stainless steel flange and pipe fitting manufacturers,not only to consider the production cost of flanges and pipe fittings,but also to consider the factors that can prevent corrosion and improve product quality.Therefore,it is suggested to use solid solution in the production of stainless steel flanges and pipe fittings to improve the safety of products.

Heat treatment technology plays an important role in the quality and safety of pipe fittings.A few enterprises only polished and blasted the pipe fitting to make up for the defects and deficiencies and save their costs of the pipe fitting, but did not use the solid solution treatment, which will bring long-term hidden dangers to the use of the pipe fitting.

In the process of solid solution strengthening,the austenitic stainless steel is softened by heat treatment,and the stainless steel is heated to about 950 ~ 1150℃ for a period of time,so that the carbide and various alloy elements are uniformly dissolved in the austenitic.

The effect of heat treatment on stainless steel pipe fittings

Stainless steel pipe after molding,welding and other processes,the molecular structure,magnetic properties and physical properties of the metal will change.The atmosphere protecting solution treatment process can restore the corrosion resistance ability that is affected after the previous processing,and at the same time the required hardness of stainless steel is obtained to ensure its optimal use.

With solid solution treatment,the stainless steel pipe fittings are able to have good improvement effects as follows:

1. Eliminate the chemical modification phenomenon of stainless steel pipe fittings during processing, reduce the hardness of stainless steel to below 220HV, improve the plasticity and toughness of stainless steel, and make the pipe fittings more convenient and safe in installation.

2. Restore stress and intergranular changes in the production process, reduce intergranular corrosion and stress corrosion of stainless steel, and enhance corrosion resistance ability.

3. Remove the magnetic properties generated during processing, and stabilize the austenite structure.

4. Restore the naturally smooth and shiny surface of the stainless steel material.

Characteristics of solid solution for stainless steel pipe fittings

Stainless steel is a special type of steel. Due to the presence of alloying elements such as nickel and chromium,its heat treatment has different characteristics from normal steel heat treatment:

1. The thermal conductivity of stainless steel is low.The thermal conductivity at room temperature is only 27% of that of carbon steel.With the increase of heating temperature,the thermal conductivity of stainless steel is gradually reduced.Therefore,when the stainless steel is heated at a low temperature,the temperature rising process should be carried out slowly.

2. After austenitic stainless steel is heated to about 1100 °C by solid solution,it can inhibit the generation of carbides,and then rapidly cool to room temperature to make the carbon supersaturated,which can greatly improve the corrosion resistance of stainless steel.

3. The pipe fittings are protected by gas (hydrogen) during the solid solution treatment to avoid the formation of viscous iron oxide on the surface of the stainless steel, and to restore the brightness of the stainless steel surface.