ALTA SKD11 Tool Steel Properties (JIS G4404)

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Cold work tool steel

ALTA SKD11 Tool Steel Specification

Steel properties

ALTA SKD11 tool steel is a general-purpose cold work tool steel with high wear resistance (C%1.40~1.60, Cr%11.0~13.0), combined with better toughness performance than tool steel 1.2379, D2, 1.2080, D3 materials. This SKD11 steel has good hardenability and small deformation during quenching.

After spheroidizing annealing treatment, ALTA SKD11 tool steel would obtain a good machinability, and the carbide particles are small and uniform, good toughness and not easy to be cracked.

Applications

² High efficiency blanking dies, punch dies, coining dies for thin plates thickness <= 6mm

² Various kinds of scissors, inlay blades, woodworking blades, shear blades, industrial cutting knives

² Slider-resistant cold heading dies, cold forging dies, deep drawing dies, cold extrusion dies

² Forming rolls

² Thermosetting resin molds, general plastic molds

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	V	Ni	Cu
Min.	1.40	0.10	0.15			11.0	0.80	0.20
Max.	1.60	0.40	0.60	0.030	0.020	13.0	1.20	0.50	0.25	0.25

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 250 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 - 650 mm
Size range (flats, plates)	8 - 400 mm in thickness max. 1100 mm in width

** Available in stock of round bars, flat bars, sheets and plates

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	830 - 880	max. 250 HB

Hot-forming	Temperature(°C)
	900 - 1100

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	1000 - 1050 (*)	Air or Oil	150 - 200

** Preheat to 700-750°C, then heat to 1000-1050°C and cool in still air. If the steel thickness is more than 200mm, it is better to heat to 980-1030°C and quenched in oil.

Ac1	Accm	Ar1	Arcm	Ms
830	855	750	780	230

Downloads

2024-09-19 Alta SKD11 SPEC (011 - S6 - T1 ).pdf

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Product images

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Features

² High wear resistance (can be used as a punching die for stainless steel and high hardness materials)

² Good hardenability, air-cooled hardening (not prone to quenching cracks)

² Good toughness

² Good machinability

Coefficient of thermal conductivity : λ W/(m·K)

Temperature °C	25	100	200	300	400	500	600
λ	16.9	19.7	21.1	22.5	24.0	25.2	28.2

Coefficient of linear expansion : α(mm/(mm·°C))

Temperature °C	20~100	20~200	20~300	20~400	20~500	20~600
Αx 10-6	10.60	11.90	11.80	12.0	12.2	12.2

SKD11 steel heat treatment for reference :

Quenching + tempering	normal usage
Quenching + cold treatment + tempering	suitable for high precision and dimensional stability requirements
Quenching + tempering + nitriding	suitable for high surface hardness requirements

2024-09-19 Alta SKD11 SPEC (011 - S6 - T1 ).pdf