Material | Pretreatment | Automatic Surface Hardening | Surface Treatment |
45 round bar | Quenching and tempering to 201-269 Brinell hardness to make the workpiece have good comprehensive machining properties | High-frequency quenching to 52-60 Rockwell hardness with layer depth 1.5-2.5mm | The surface anti-corrosion and wear-resistant treatment include bluing, phosphating and hard chrome plating. The hard chrome layer thickness is 0.03-0.05mm and hardness not less than 900HV |
40Cr round bar | Quenching and tempering to 220-270 Brinell hardness to make the workpiece have good comprehensive machining properties | High-frequency quenching to 56-62 Rockwell hardness with layer depth 1.5-2.5mm | The surface anti-corrosion and wear-resistant treatment include bluing, phosphating and hard chrome plating. The hard chrome layer thickness is 0.03-0.05mm and hardness not less than 900HV |
RJ Attachements is a custom metal fabricator. In 1990, we started as a small firm from making wear plate only. After 30 years growth, today we are operating from our 3000 square meters manufacturing facility where we employ in excess of 30 people. We are fully equipped with machinery like plate edge milling machine, CNC plasma cutting machine, CNC bending machines, CNC shearing machines, plate bending rolls, etc. RJ is approved supplier of steel structures for tunnel construction projects national wide in China. All our products are well engineered and built to last. More than 70% were exported to developed countries like Australia, USA, UK and Canada.