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 |
850 - 890 |
max. 250 HB |
Hot-forming |
Temperature(°C) |
900 - 1100 |
Hardening and tempering |
Quenching temperature(°C) |
Quenching medium |
Frequently-used tempering temperature(°C) |
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.
Ac1 | Accm | Ar1 | Arcm | Ms |
845 | 905 | 715 | 800 | 115 |
Downloads
-
2024-09-17 Alta 1.2990 Mod. DC53 SPEC (011 - S6 - T1 ).pdf
끂21 277.75 KB
Features
² High wear resistance
² High strength
² High hardenability
² High toughness (~ 2 times of SKD11 steel)
² Good cutting, machining ability and grinding properties
² Small residual stress after wire cutting
Coefficient of thermal conductivity : λ W/(m·K)
Temperature °C | 25 | 100 | 200 | 300 | 400 | 500 | 600 |
λ | 17.8 | 19.3 | 20.0 | 22.5 | 24.3 | 24.5 | 26.3 |
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 | 10.80 | 11.60 | 12.20 | 12.80 | 13.20 | 13.50 |
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