For materials used inindustrial high pressure valves, heat treatment and surface hardening are usually used to improve their extrusion and erosion resistance.

Industrial high pressure valves

1. Vacuum heat treatment

Vacuum heat treatment refers to the heat treatment process in which the workpiece is placed in vacuum. Vacuum heat treatment does not produce oxidation, decarbonization and other corrosion during heating, and has the function of degreasing and degreasing of purifying surface. In vacuum, the hydrogen, nitrogen and oxygen absorbed by the material in the smelting process can be removed, and the quality and performance of the material can be improved. For example, after vacuum heat treatment of the ultra-high pressure needle valve made of W18Cr4V, the impact willfulness of the needle valve is effectively increased, and the mechanical properties and service life are also improved.

2. Surface strengthening treatment

In order to improve the performance of parts, in addition to changing the material, more surface strengthening methods are used. For example, surface quenching (flame heating, medium and high frequency heating, contact electric heating, electrolyte heating, laser electron beam heating, etc.), carburizing, nitriding, cyaniding, boronizing, metalizing (TD), laser strengthening, chemical vapor deposition (CVD), physical vapor deposition (PVD), plasma, etc. Volume chemical vapor deposition (PCVD) plasma spraying, etc.

www.hento-ht.com