ALTA 1.2358 Tool Steel Properties (X60CrMoV18-5)

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Cold work tool steel

ALTA 1.2358 Tool Steel Specification

Steel properties

ALTA 1.2358 is a Chrome-molybdenum-vanadium tool steel that have high toughness and good wear resistance. This 1.2358 steel's toughness is higher than other common cold work tool steel grades such as 1.2379, D3/1.2080, D2, A2/1.2363, D6/1.2436. An excellent combination of toughness and wear resistance enables a good usage for different pressing and injection applications during plastics processing.

The 1.2358 steel also has good hardenability and good dimensional stability. It can also be welded and polished well.

Applications

² Cold work area :
cutting and mechanical working (also materials of bigger thicknesses), deep drawing, punching, rolling, production of shear blades, more complicated tools for cold work

² Plastic molds area :
Molds for large series, molds for plastics with additives, tools for plastics stamping

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	V	Ni	Cu
Min.	0.58	0.20	0.70			4.30	0.40	0.20
Max.	0.62	0.50	0.90	0.020	0.010	4.70	0.60	0.30	0.25	0.25

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 240 HB (annealed), pre-hardened 280 – 325 HB normally
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)	8 - 400 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	820 - 860	max. 240 HB

Hot-forming	Temperature(°C)
	850 - 1050

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	950 - 980	Oil	180 - 400