ALTA 1.2329 Tool Steel Properties (X46CrSiMoV7)

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Hot work tool steel

ALTA 1.2329 Tool Steel Specification

Steel properties

ALTA 1.2329 steel have high resistance to thermal shock and heat cracking, good mechanical characteristics in hot condition, optimal mechanical characteristics in cold condition and good toughness in hot condition. Obtained through a special 'super clean' manufacturing process -ESR, which allows a high level of micro-purity to be achieved.

Applications

Special alloyed steel designed for dies, molds, punches and other components subjected to high working temperature, such as :

² dies subjected to low pressure

² containers for die-casting presses

² extrusion press blocks and sleeves for extrusion presses etc.

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	V	Ni	Cu
Min.	0.43	0.60	0.65			1.65	0.25	0.17	0.45
Max.	0.48	0.75	0.85	0.025	0.010	1.85	0.35	0.22	0.60	0.25

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 230 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)
Microstructure	SEP1614 or NADCA # 207
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 - 800 mm
Size range (flats, plates)	8 - 500 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	760 - 800	max. 230 HB

Hot-forming	Temperature(°C)
	900 - 1000

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	880 - 920	Oil or salt bath	/