Martensitic Stainless Steel
ALTA 1.4104 Stainless Steel Specification
Steel properties
ALTA 1.4104 steel has moderate strength and corrosion resistance, and compared to other 17% Chromium martensitic stainless steels, 1.4104 steel's corrosion resistance is weaker due to the addition of sulfur.
The added sulfur gives 1.4104 stainless steel an excellent machinability and a finely ground surface, and it can be used for structural parts in water and steam applications.
(1.4104 +QT650 is available)
Applications
² Automatic lathe parts: such as bolts, nuts and other fasteners processed in large quantities
² Mechanical parts: especially in environments that require high precision and high efficiency processing
² Pumps and pump shafts, valves, piston rods
Chemical composition
Chemical Composition per %
|
C |
Si |
Mn |
P |
S |
Cr |
Mo | Ni |
Cu |
Min. |
0.10 |
|
|
|
0.15 |
15.5 |
0.20 |
|
|
Max. |
0.17 |
1.00 |
1.50 |
0.040 |
0.35 |
17.5 |
0.60 | 0.25 |
0.25 |
Basic melting process : |
IM/EAF + LF + VD + (ESR) |
Hardness : |
Max 220 HB (annealed), QT650 (Rm. 650 – 850 Mpa) |
Reduction ratio : |
5 : 1 minimum or required |
Grain size : |
≥ 5.0 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) |
30 - 400 mm in thickness max. 810 mm in width |
Heat treatment
Annealing |
Temperature(°C) |
Hardness |
750 - 850 |
max. 220 HB |
Hot-forming |
Temperature(°C) |
800 - 1100 |
Hardening and tempering |
Quenching temperature(°C) |
Quenching medium |
Frequently-used tempering temperature(°C) |
990 - 1070 |
Oil or Air-cooled |
550 - 650 |
Ac1 | Ac3 |
815 | 890 |
Coefficient of thermal conductivity : λ W/(m·K)
Temperature °C | 20 |
λ | 25 |
Coefficient of linear expansion : α(mm/(mm·°C))
Temperature °C | 20~100 | 20~200 | 20~300 | 20~400 | 20~500 |
Αx 10-6 | 10.00 | 10.50 | 10.50 | 10.50 | 11.00 |
Downloads
-
2024-09-29 Alta 1.4104 SPEC (010 – S1 - T1 ).pdf
끂0 314.12 KB
Features
² Excellent machinability
² High toughness
² Moderate strength
² Moderate corrosion resistance
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