ALTA 1.2746 Tool Steel Properties (X45NiCrMoV16-6)

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Cold work tool steel

ALTA 1.2746 Tool Steel Specification

Steel properties

ALTA 1.2746 (45NiCrMoV16-16) is similar as ALTA 1.2767. With its high nickel content, this material offers a very good combination of through hardenability and toughness. Additional alloying with vanadium and molybdenum achieves higher resistance to abrasive wear. This material is used where high resistance to impact and shock loads is required and the wear resistance of a 1.2767 material is insufficient. The material is used in applications such as highly stressed industrial knives in the recycling industry.

Applications

² Cold cutting knives, scrap knives, industrial cutting knife/blades

² Highly stressed tools for cold punching, pressing of plastics, big breeze blocks and harden

² Thick plate stamping die, tableware mold, large size blanking die, hot forging dies, embossing dies

** Suggests during further cutting or machining processing
1. Cutting at slower speed rates, or go with hard alloy made saw blade
2. Spray a small amount of engine oil on the steel surface during machining work

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	V	Ni	Cu
Min.	0.41	0.15	0.60			1.40	0.73	0.45	3.80
Max.	0.49	0.35	0.80	0.020	0.010	1.60	0.85	0.55	4.20	0.30

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 280 HB (annealed)
Reduction ratio :	5 : 1 minimum or required
Grain size :	≥ 6.0 per ASTM E112
Non-metallic inclusion :	≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route)
Ultrasonic Test	SEP1921, EN 10308, ASTM A388 or agreed methods
Macro-structure	As per ASTM E381
Straightness / flatness	≤ 1.5 mm / m (machined), ≤ 2.5 mm / m (black)
Tolerance	Per discussed
Size range (round bars)	Ø 12 - 500 mm
Size range (flats, plates)	12 - 500 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	610 - 650	max. 280 HB

Hot-forming	Temperature(°C)
	850 - 1050

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	880 - 910	Oil or air-cooled	160 - 250