Tool steels hardened, hardness range

A hard, mst-resistant shaft of at least 0.25 micrometer finish is usually required. Common shaft surfaces are hardened tool steel, chrome plate, high strength bronze, and carbide and ceramic overlays. Test results over a broad speed range from 0.05 to 47 m/s (10 to 9200 fpm) iadicate that a coefficient of friction of 0.16—0.20 and a wear factor of 14 X 10 m /N(70x 10 ° in. min/ft-lb-h) are typical for dry operation of weU appHed grades of carbon—graphite (29). 

Through-hardening plastic mold steels for hardening after (pre-)machining, e.g. for molds and tools subject to high wear (hardness range 44 to 62 HRC)... 

Tungsten Forms hard and stable carbides raises the critical temperature range, and tempering temperatures hardened tungsten steels resist tempering up to 600°C Major constituent in high-speed tool steels also used in some permanent magnet steels... 

A comparison of several physical properties of common mold alloys is shown in Table 2. C17200 LH is over-aged C17200, such as Brush Wellman s MoldMAX Low Hard. C96970 is the Brush Wellman proprietary alloy MoldMAX XL , which is a UNS C96970 Cu-Ni-Sn spinodally hardened alloy. AISI P-20 is a Cr-Ni-Mo tool steel. All of these alloys are supplied in the 26-32 HRC hardness range. 

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