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Only high quality tool materials are used to produce HSS tools. Systematic selection of alloying elements ensure the tool possesses the optimal characteristics for the individual tasks:

• Tungsten: increases tempering and wear-resistance
• Molybdenum: improves toughness
• Vanadium: increases wear-resistance of finishing tools
• Cobalt: enables increased hardening temperatures and improves heat-resistance

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Guhring description	Germany steel description	Material no. (steel code)	Range of application	Hardness HV 40	Composition [%]	comparable steels
						USA	France	Italy	GB
	S 6-5-2 (DMo5)	1.3343	standard tool material for most common application	820 to 900	0,9 C 4,2 Cr 6,5 W 5,0 Mo 2,0 V	M 2	Z 90 WDCV 06-05-04-02	HS 6-5-2	BM 2
	S 6-5-2-5 (EMo5Co5)	1.3243	high heat-resistance, especially suited for roughing when coolant supply is insufficient	850 to 900	0,9 C 4,2 Cr 6,5 W 5,0 Mo 2,0 V 4,8 Co	M 35	Z 90 WDKCV 06-05-05-04-02	HS 6-5-2-5	-
	S 6-5-3 (EMo5V3)	1.3344	increased cutting edge stability, important for finishing operations or sensitive edges, e.g. taps	-	1,2 C 4,2 Cr 6,5 W 5,0 Mo 3,0 V	M 3	Z 120 WDCV 06-05-04-03	HS 6-53	-
	S 2-10-1-8	1.3247	extremely tough, therefore also suitable for interrupted cutting operations	860 to 920	1,1 C 4,2 Cr 1,8 W 10,0 Mo 1,2 V 8,0 Co	M 42	Z 110 DKCWV 09-08-04-02-01	HS 2-9-1-8	BM 42
	S 6-5-3-9 ASP 30	1.3207	very dense structure, high hardness, heat-resistance and cutting edge stability; HSS tool material of the future, already in use today	875 to 925	1,1 C 4,2 Cr 1,8 W 10,0 Mo 1,2 V 8,0 Co	CPM M 45

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