Cold work tool steel
ALTA A8 Modified Tool Steel Specification
Steel properties
ALTA A8 Mod. steel (8% Cr -chromium steels) is a modified version of AISI A8 steel, by replacing high W% with intermediate V%, this improves the toughness of steel to a certain extent. Meanwhile, increased chromium to be around 8%, its wear resistance get improved very much.
It can be used in situations where chipper steels like 1.2360, 1.2362 are insufficient in terms of wear resistance and tool steels like 1.2379, D2, SKD11 do not have sufficient toughness. ALTA A8-modified steel is perfect for making industrial knives for the wood-working industry. It's also used for stamping and cutting tools etc.
Applications
² Wood chipper knives, shredding knives, planner knives
² Plastic granulator knives
² Slitter knives, scrap shears, shear blades
² Fine blanking dies, stamping dies, punches
² Cold forming tools/dies
Chemical composition
Chemical Composition per %
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
V |
Ni |
Cu |
Min. |
0.48 |
0.90 |
0.35 |
|
|
7.95 |
1.35 |
0.40 |
|
|
Max. |
0.55 |
1.00 |
0.50 |
0.025 |
0.015 |
8.05 |
1.45 |
0.50 |
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 |
Downloads
-
2024-06-25 Alta A8-Modified SPEC (011 - S6 - T1 ).pdf
끂47 243.04 KB
Features
² High wear resistance
² Good toughness
² Excellent dimensional stability
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