ALTA 1.2842 Tool Steel properties (X90MnCrV8, O2)

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Cold work tool steel

ALTA 1.2842 Tool Steel Specification

Steel properties

ALTA 1.2842 steel is a Manganese–chrome–vanadium steel with the middle hardenability for hardening in oil, particularly good dimensional stability at the heat treatment, good resistance to the wear and cutting power. Considerable sensitivity to cooling by water during the hardening and tempering, good polishability, good ductility at the heat and good workability in the annealed state.

Applications

² Various precision measuring tools, templates, block gauges, dies

² Precision screws and grinder spindles requiring small deformation and high wear resistance

² Smaller punching dies, cold pressing dies, cold heading dies, engraving dies, blanking dies

² Slitting knife … etc.

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	V	Ni	Cu
Min.	0.85	0.10	1.80			0.20	0.05
Max.	0.95	0.40	2.20	0.030	0.030	0.50	0.15	0.25	0.30

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 220 HB (annealed)
Reduction ratio :	5 : 1 minimum or required
Grain size :	≥ 5.0 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 - 600 mm
Size range (flats, plates)	8 - 500 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	680 - 720	max. 220 HB

Hot-forming	Temperature(°C)
	850 - 1050

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	790 - 820	Oil	150 - 250