Stainless Steel Hexagon Bolts Process Introduction

The manufacturing process of stainless steel hexagon bolts is as follows:
Normalizing: the screw is heated to the appropriate temperature above the critical point AC3 or ACM for a certain time and then cooled in air to obtain pearlite structure.
Annealing: the hypoeutectoid screw is heated to 20-40 ℃ above AC3 and cooled slowly in the furnace (or buried in sand or lime) to below 500 ℃ and cooled in air after holding for a period of time.
Solution heat treatment: the alloy is heated to high temperature, and the single-phase zone is kept at constant temperature, so that the excess phase is fully dissolved into the solid solution, and then rapidly cooled to obtain the supersaturated solid solution.
Aging: after solution heat treatment or cold plastic deformation, the properties of alloy change with time when placed at room temperature or slightly higher than room temperature.
Solution treatment: dissolve all kinds of phases in the alloy, strengthen the solid solution, improve the toughness and corrosion resistance, eliminate stress and softening, so as to continue processing and forming.
Aging treatment: heating and holding at the temperature of strengthening phase precipitation, so that the strengthening phase precipitates, hardens and improves the strength.
Quenching: it is a heat treatment process in which the steel is austenitized and cooled at a proper cooling rate, so that the unstable structure transformation such as martensite occurs in all or a certain range of the cross section of the workpiece
Tempering: a heat treatment process in which the quenched workpiece is heated to an appropriate temperature below the critical point AC1 for a certain period of time, and then cooled in a satisfactory way to obtain the required microstructure and properties.