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High Speed Steels

For modern industrial production, in particular mass production, machining is one of the most important shaping and forming processes. Almost all tools employed for this purpose are made from high-speed steels. In recent times, the use of high-speed steels has gained increasing importance for chipless shaping, e.g. for extrusion, blanking, and punching tools. With regard to chemical composition, a clear distinction is made between ‘Tungsten’, ‘Molybdenum’, and ‘Tungsten-Molybdenum’ alloyed high-speed steel grades which, depending on the dominant stresses they will be exposed to, contain differing amounts of Carbon, Vanadium, and Cobalt.
The characteristic properties of all high-speed steel grades include:

High working hardness
High wear resistance
Excellent toughness
Compressive strength
High retention of hardness and red hardness
Strength to prevent breakage on the cutting edge

Matrix-type high speed steel (QHZ)

The QHZ is a matrix-type high speed steel. QHZ contributes to increased productivity and reduction of manufacturing cost by dramatic improvement of dies service life.

Chemical Composition

C	Si	Mn	Cr	Mo	V
PATENTED

Standards

QHZ

YXR33

Features of QHZ

High strength and unrivaled toughness are both achieved by reducing massive carbides in steels.

• QHZ is a matrix-type high speed steel that combines high strength equivalent to SKH51 and excellent toughness by improving microstructure and the distribution of carbides.

• Due to superior toughness and high temperature strength combined with much higher hardness than conventional hot working die steel, QHZ is suitable for cold, warm, and hot forming.

Applications

Cold forging dies
Hot/Warm forging dies
Sleeves for Aluminium dies casting, etc.

Merit of QHZ

Long service life even under severe application environment

QHZ is resistant to high-temperature ware, deformation, cracking and chipping, etc; It is expected to increase the service life of dies even under severe application environment.

Positioning and Properties of QHZ

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GLORIA (AISI)	DIN	JIS	BOHLER	UDDEHOLM	HITACHI
M35	1.3243	SKH55	S705	-	YXM4
M42	1.3247	SKH59	S500	-	YXM42
T1	1.3355	SKH2	S200	-	YHX2
ASP2023	1.3395	-	S790	ASP23	HAP10
ASP2030	1.3294	-	S590	ASP30	HAP40
ASP2052	1.3253	-	S390	ASP52	HAP50
ASP2060	1.3292	-	S290	ASP60	HAP72

	Chemical Composition												Application
Grade	C	Si	Mn	P	S	Cr	Mo	V	Ni	Cu	W	Co
M35	0.92	0.32	0.28	0.025	<0.001	3.91	4.90	1.82	0.18	0.12	6.12	4.67	As M2, Hobs, Drill reamers, Milling cutters and Forging Dies, Cold Forming Tools etc.
M42	1.09	0.47	0.30	0.020	<0.010	3.77	9.29	1.21	0.3	0.21	1.51	7.94	Taps, Reamers, Broaching tools, Twist drills.
T1	0.78	0.33	0.29	0.018	-	3.98	-	1.13	-	-	18.15	-	Turning, planing and slotting tools, tapes, twist drills, threading dies, profile cutting tools, broaching tools, reamers.
ASP2023	1.28	0.61	0.30	0.030	0.020	4.00	4.88	2.98	0.21	0.14	6.11	0.24	Gear cutting tools, Cold work, Broaches, Rolls, Taps, Knives, Plastic injection etc.
ASP2030	1.25	0.29	0.27	0.020	0.020	4.10	5.00	3.00	0.21	0.090	6.30	8.40	Standard grade/good balance of properties,
ASP2052	1.59	0.29	0.27	0.025	0.23	4.95	1.94	4.75	0.21	0.12	10.48	8.04	Machining (Grinding, Turning, Milling), Polishing, Plastic Forming.
ASP2060	2.20	0.36	0.32	0.026	0.024	4.12	6.82	6.39	0.20	0.14	6.48	10.36	Good wear resistance and highest hardness of 70 HRC.

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