Hot work tool steel
ALTA 1.2343 Tool Steel Specification
Steel properties
ALTA 1.2343 steel is a kind of ~ 5% chromium hot work tool steel, get a widely using in Europe steel markets, and it can achieve super high-cleanliness by electroslag remeltng (ESR). This tool steel grade have very high hot toughness, good hot hardness (red hardness and good resistance against heat cracking.
The common working hardness of this ALTA 1.2343 tool steel is 44-50HRC. When subjected to large impact force, the hardness can be reduced to 40-44HRC. When used as an aluminum alloy die-casting mold, the hardness can be increased to 52HRC.
The room temperature properties of 1.2343 steel (tensile properties, impact toughness, fracture toughness), impact toughness at 300 - 700°C, oxidation resistance at 600 - 1000°C, friction coefficient at 1000°C, thermal wear at 800 - 850°C, forging performance at 800 - 1200°C , cutting performance and so on are better than 1.2581/AISI H21 steel.
Applications
² Die-casting mold (mold core, insert, mold core, diverter cone, nitrided ejector pin)
² Extrusion die (mold core, die pad, flow block)
² Hot pressing molds for aluminum, copper, magnesium
² Cold stamping, hot shearing, compression rings and wear-resistant parts
² Hammer forging die, press forging die
Chemical composition
Chemical Composition per %
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
V |
Ni |
Cu |
Min. |
0.33 |
0.80 |
0.25 |
|
|
4.80 |
1.10 |
0.30 |
|
|
Max. |
0.41 |
1.20 |
0.50 |
0.025 |
0.010 |
5.50 |
1.50 |
0.50 |
0.25 |
0.30 |
Basic melting process : |
IM/EAF + LF + VD + (ESR) |
Hardness : |
Max 229 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) |
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 - 600 mm in thickness max. 1100 mm in width |
Heat treatment
Annealing |
Temperature(°C) |
Hardness |
760 - 780 |
max. 229 HB |
Hot-forming |
Temperature(°C) |
900 - 1100 |
Hardening and tempering |
Quenching temperature(°C) |
Quenching medium |
Frequently-used tempering temperature(°C) |
1010 - 1030 |
Oil or air-cooled |
540 - 560 |
Ac1 | Ac3 | Ar1 | Ar3 | Ms | Mf |
853 | 912 | 735 | 810 | 310 | 130 |
Elastic modulus : E ( N/mm2 )
Temperature °C | Room 20 | 100 | 200 | 300 | 400 | 500 |
E | 21200 | 20900 | 20200 | 19600 | 18600 | 17800 |
Modulus of rigidity / Shear modulus of elasticity : G ( N/mm2 )
Temperature °C | Room 20 | 100 | 200 | 300 | 400 | 500 |
G | 8100 | 8000 | 7700 | 7500 | 7200 | 6800 |
Ratio of elastic modulus to shear modulus :
Temperature °C | Room 20 | 100 | 200 | 300 | 400 | 500 | Average ratio |
E : G | 2.617 | 2.613 | 2.623 | 2.613 | 2.583 | 2.618 | 2.611 |
Coefficient of thermal conductivity : λ W/(m·K)
Temperature °C | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
λ | 26.0 | 27.6 | 28.5 | 28.1 | 27.6 | 26.8 | 26.0 |
Coefficient of linear expansion : α(mm/(mm·°C))
Temperature °C | 20~100 | 20~200 | 20~300 | 20~400 | 20~500 | 20~600 | 20~700 |
Αx 10-6 | 10.00 | 10.90 | 11.40 | 12.20 | 12.80 | 13.30 | 13.60 |
Oxidation resistance : (test sample hardness 49.0 HRC), + g/m2
h | 2 | 7 | 15 | 25 | 35 | 45 | 60 | 80 | 125 | 150 |
600 °C | 0 | 0.1 | 0.4 | 0.4 | 0.4 | 0.4 | 0.6 | 1.1 | 1.1 | 2.0 |
** The oxidation resistance of ALTA 1.2343 steel is better than ALTA 1.2581/AISI H21 steel at 600°C x 150h, and its oxidation weight gain is Reduced by 32.6g/m2
h | 750 °C | h | 750 °C |
2 | 0.9 | 25 | 30.9 |
5 | 3.9 | 30 | 34.0 |
8 | 8.4 | 35 | 36.6 |
11 | 13.0 | 40 | 39.2 |
15 | 18.7 | 45 | 42.5 |
20 | 26.1 | 50 | 45.9 |
** The oxidation resistance of ALTA 1.2343 steel is better than ALTA 1.2581/AISI H21 steel at 750°C x 50h, and its oxidation weight gain is reduced by 75.2g/m2
H | 1 | 2 | 3 | 4 |
1000 °C | 95.0 | 217.6 | 368.3 | 460.0 |
** The oxidation resistance of ALTA 1.2343 steel is better than ALTA 1.2581/AISI H21 steel at 1000°C x 4h, and its oxidation weight gain is reduced by 103.5g/m2
Thermal stability (-HRC) (A=49.2-50.0 HRC)
(1) 620°C
Soaking time (h) | A | Soaking time (h) | A |
0 | 49.7 | 11.5 | 34.4 |
2 | 39.4 | 14.5 | 33.2 |
4 | 38.4 | 17.5 | 32.6 |
6 | 36.9 | 21 | 32.3 |
8 | 35.1 |
** Under the same A hardness conditions, the thermal stability of ALTA 1.2343 tool steel at 620°C for 2-21 hours is lower than ALTA 1.2581/H21 tool steel, and its hardness difference is 7.2 - 9.6 HRC.
(2) 660°C
Soaking time (h) | A | Soaking time (h) | A |
0 | 49.3 | 5 | 29.8 |
1 | 34.5 | 7 | 28.0 |
2 | 31.5 | 9 | 27.9 |
3 | 30.9 | 12 | 26.7 |
** Under the same a hardness conditions, the thermal stability of ALTA 1.2343 tool steel at 660°C for 1-12 hours is lower than ALTA 1.2581/H21 tool steel, and its Hardness difference is 5.1 - 9.6 HRC.
(3) 700°C
Soaking time (h) | 0 | 0.5 | 1 | 1.5 | 2 | 3 |
A | 49.9 | 31.8 | 29.8 | 28.5 | 28.4 | 27.4 |
** Under the same A hardness conditions, the thermal stability of ALTA 1.2343 tool steel at 700°C for 0.5-3 hours is lower than ALTA 1.2581/H21 tool steel, and its hardness difference is 2.5 – 5.7 HRC.
Downloads
-
2024-06-12 Alta 1.2343 SPEC (011 - S6 - T2).pdf
끂76 306.75 KB
Features
² High toughness and ductility
² High micro-cleanliness
² High thermal fatigue resistance
² High red hardness
² High polishability and machinability
² Good wear resistance
² Good hardenability and dimensional stability
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