ALTA 1.2990 Mod. / DC53 Tool Steel Properties

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Cold work tool steel

ALTA 1.2990 Mod. / DC53 Tool Steel Specification

Steel properties

ALTA 1.2990 Mod. tool steel (similar as JIS DC53 steel) belongs to the group of 8% Chromium material. Compared to 12% Chromium group steels (1.2379, D2, 1.2080/D3, 1.2436/D6, JIS SKD11), this 1.2990 Mod. / DC53 steel has better toughness, hardenability and higher wear resistance to adhesive. These performance advantages provide a good choice to manufacture industrial cutting knives subject to high stress.

Compared to conventionally SKD11, Cr12MoV steels, this 1.2990 Mod. / DC53 steel has almost completely decomposed residual austenite under common heat treatment conditions, and generally can omit deep-cold heat treatment. It can still maintain a high toughness at high hardness condition (about twice that of SKD11 steel).

Applications

² Precision stamping dies, precision blanking dies and various purpose stamping dies

² Industrial cutting knives

² Cold forging dies, deep drawing and thread rolling

² High-speed blanking punch, stainless steel plate punch

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	V	Ni	Cu
Min.	0.95	0.80	0.20			7.80	2.00	0.25
Max.	1.03	1.10	0.50	0.030	0.020	8.30	2.20	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 - 500 mm
Size range (flats, plates)	8 - 400 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	850 - 890	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	1020 - 1040	Air or Oil	180 - 200 or 520 - 530 (*)

** Tempering times >= 2 times, big/thick sizes suggested at 3 times.
** Complex-shaped precision punching dies, trimming dies, cold rolling rollers .. etc are advisable to adopt "low-temperature" tempering processing. So that the tools, molds workpiece can obtain a good combination property of high hardness, high toughness, high wear resistance and high strength.
** Complex molds that are subject to large impact loads can use a low-temperature quenching and high-temperature tempering process to obtain higher impact toughness and prevent brittle fracture of the mold.