There are several variations of the basic screw section available from CSC. Along with various materials of construction, additional processes can be used to improve the performance of a screw for a particular application.
Another option is to have the screw electropolished, a common choice when handling sticky materials.
One option is to hardsurface the pipe and/or flight surfaces of the screw section. CSC has an automated hardsurfacing process which can apply powder to take the hardness of the treated area up to 60Rc. Applied using a plasma transfer arc, the powder is embedded into the pipe/flight for a solid bond, more durable than coatings which only sit on the surface.
Hardsurfacing is used for applications involving highly abrasive materials such as glass or sand. It can also be a cost effective option for units which are difficult to maintain, the initial extra cost being offset by the reduced maintenance required due to extended service life.