The choice of material used in screw-barrel manufacturing directly determines the set's service life, performance and cost. Let's compare the properties of the three most commonly chosen options: 38CrMoAlA nitriding steel, bimetal coating, and tool steel.
38CrMoAlA Nitriding Steel
38CrMoAlA is a steel grade alloyed with aluminum and chromium-molybdenum, specially developed for the nitriding process. After nitriding, a surface hardness of around 900-1000 HV is achieved. It is an economical and widely used solution for standard raw materials with low abrasiveness.
Bimetal-Coated Sets
In bimetal sets, a thick, very hard alloy layer (typically nickel- or cobalt-based, containing tungsten carbide) is applied over the steel body. This layer provides much higher wear and corrosion resistance compared to nitriding, and is especially preferred for abrasive or corrosive raw materials.
Tool Steel (e.g. H13, SKD61)
Tool steels are preferred for special applications requiring high temperature resistance and toughness (for example, systems operating at high temperature or subject to impact). Although less common in general-purpose screw-barrel manufacturing, they are a suitable option for special conditions.
Comparative Selection Criteria
- Standard PP/PE/PVC, low filler ratio: 38CrMoAlA nitriding steel can be sufficient and economical
- Glass fiber, mineral filler, high abrasiveness: bimetal coating is recommended
- Special formulations containing corrosive additives (e.g. some flame retardants): bimetal or stainless alloy solutions
- If high temperature and impact resistance are the priority: a special tool-steel-based design
What Should Be Done for the Right Choice?
Material selection should be evaluated based on the raw material processed, production volume, existing wear history and budget priorities. At Milon, we help you determine the most suitable material combination based on your machine's operating conditions.
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