ALTA 1.2631 Tool Steel Properties (X50CrMoW9-1-1)

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Cold work tool steel

ALTA 1.2631 Tool Steel Specification

Steel properties

ALTA 1.2631 is a medium carbon, air-hardening tool steel that is characterized by a combination of very good toughness and wear resistance, and excellent dimensional stability in heat treatment. Has been used for punches that operate in the 55 to 60 Rockwell C hardness range. More toughness than 1.2363 or 1.2379, More wear resistance than 1.2357, very stable in heat treatment.

Applications

² Wood cutting knives

² Flat, circular shear blades (5 to 15mm thick sheet, plate)

² Paper cutting knives

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	W	Ni	Cu
Min.	0.45	0.80	0.40			8.00	1.10	1.10
Max.	0.55	1.00	0.60	0.020	0.010	9.00	1.30	1.30	0.25	0.25

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 230 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)	8 - 400 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	750 - 800	max. 230 HB

Hot-forming	Temperature(°C)
	850 - 1100

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	1020 - 1050	Oil	180 - 300