Nitriding is a heat treatment process conducted in a gaseous mixture of nitrogen and hydrogen. The temperature is elevated to 930–1100ºF (500–593ºC), initiating the nitriding reaction. Plasma is diffused onto the metal surface, forming a nitrided layer within the screws that contains chromium nitride (CrN). This composition provides exceptional thermal stability, enabling the screws to withstand the high temperatures generated during plastic extrusion or molding processes. With a maximum hardness of 65–70 HRC, screws made from these materials are highly resistant to wear, even in extremely demanding applications.

The centrifugal casting process involves heating metal in a high-temperature furnace to temperatures exceeding 2000°F. Once the alloy is melted, a covered cylindrical mold is placed on casting rollers and rotated at high speeds. This ensures uniform distribution of the molten alloy in terms of thickness, hardness, and density. After cooling, the cover is removed, and the barrel is machined to the finished specifications. The inlay or outer layer of bimetallic liners is typically ground to a thickness of 0.060–0.080 inches. We offer customization to suit your production environment, providing corrosion-resistant alloys, high-nickel content, tungsten carbide, high-carbon alloys, corrosion-resistant nickel, nickel-rich iron/boron alloys, and dozens of other specialized alloy options.

Screw quenching is a heat treatment process designed to enhance the surface hardness and strength of screws. The fundamental principle involves heating the screw to a specific high-temperature range, followed by rapid cooling. This induces a martensitic transformation in the screw's surface metal, forming a hardened layer. Screws are typically heated to quenching temperatures of 1000–1100°C. Post-quenching, screws usually undergo tempering treatment, which involves reheating to a lower temperature range (typically 150–250°C) for a set duration. This step alleviates internal stresses introduced during the quenching process, reducing the risk of brittleness or cracking during operation. In high-stress and high-temperature applications, quenched screws demonstrate significantly improved performance in harsh environments, effectively extending the lifespan of the equipmen

Electroplating typically includes two main types: chromium plating and titanium plating. Chromium plating is an electroplating process that deposits a layer of chromium metal onto the surface of a substrate. The chromium layer usually ranges in thickness from 10 to 50 microns and offers excellent adhesion and wear resistance, enhancing surface smoothness and durability. Titanium plating is an electrochemical process that applies a layer of titanium metal or titanium alloy onto the surface of screws. This coating is particularly suitable for screws used in high-temperature and highly corrosive environments