Screw protection | machinery
Graph comparing cresistance of Steer’s standard CR6 and new CR6-MOD corrosion protection coatings
the company’s tool steel operations, says its tool steel plant “was setup to drive innovation and create and develop tool steel that not only sets new benchmarks in performance, but allows our customers to work with new materials hitherto not possible, or realise signifi- cant efficiencies within existing processes.” He cites Acrolloy55, the latest grade in Steer’s
Acrolloy class of steel and a product of what the company refers to as Microgenic Technology. This is a vanadium-rich tool steel with other alloying and micro-alloying elements that together have very strong abrasion resistance. The uniformly distributed carbides, metallically bonded to the matrix, are claimed to exceed the wear properties of traditional HIP powder metal- lurgy steels “by a large margin.” Acrolloy 55 is a molybdenum high speed steel that has a wider heat treating range along with far greater resistance to decarburisation when compared to alternative high speed steels available today (HSS AISI M35 grade), a Steer spokesman claims. Acrolloy 55 also offers an excellent combination of red (or hot) hardness, toughness, wear resistance and cutting ability, along with fine grain and carbide particle size. According to Steer’s laboratory analysis, when
Source: Steer
Chart showing abrasion resistance of Steer Acrolloy 55 against a current high speed steel grade Source: Steer
compared to AISI M2 (the current top choice for flame retardant applications) Acrolloy 55 delivers far better properties both in a bromine and abrasion environment. Steer CR6-MOD was developed to eliminate high
corrosion of elements in equipment processing flame retardant polyamide compounds containing bromine and glass fibres. “Moreover, the presence of moisture in polyamides poses further complications while using Powder Metallurgy (PM) based steels,” Arumugam notes. By modifying the chemistry, the company says it is able to achieve far greater corrosion resistance. “Besides being extremely cost effective when compared to PM steels, CR6-MOD also demonstrated increased erosion resistance, high compressive strength, excellent through-hardening properties and good dimensional stability during hardening,” he says.
Click on the links for more information: ❙
www.extruder-experts.com ❙
www.nordsonpolymerprocessing.com ❙
www.extremecoatings.net ❙
www.leistritz.com ❙
www.centuryextrusion.com ❙
www.steerworld.com
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