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 |
750 - 800 |
max. 230 HB |
Hot-forming |
Temperature(°C) |
850 - 1100 |
Hardening and tempering |
Quenching temperature(°C) |
Quenching medium |
Frequently-used tempering temperature(°C) |
1020 - 1050 |
Oil |
180 - 300 |
Ac1 | Ac3 | Ar1 | Ar3 | Ms |
845 | 897 | 780 | 825 | 200 |
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 | 9.80 | 10.20 | 10.50 | 11.30 | 11.90 | 12.40 | 12.80 |
Downloads
-
2024-09-15 Alta 1.2631 SPEC (011 - S6 - T1 ).pdf
끂15 266.88 KB
Features
² High wear resistance
² High toughness
² High compressive strength
² Good hardenability
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