High Hardness & High Corrosion Resistance Stainless Steel
ASK-8000
Having trouble?
Strength Issues
– SUS303 and other stainless steels lack sufficient strength.
– Switching to high-strength materials increased production cost.
– Want a hard and easy-to-machine material.
Heat Treatment Issues
– Heat treatment causes delivery delays.
– Heat treatment results in deformation of parts.
– SK4, SUS420 series, and SUS630(H900) cause excess stock due to heat treatment.
Plating Process Issues
– Post-plating outer diameter changes cause defects.
– Environmental regulations may soon prohibit plating.
Stainless Steel “ASK-8000” Harder than SUS303
Easy to machine ・ Hard ・ Corrosion resistant
Ideal material for high-precision, high-strength
components.
Moreover, “ASK-8000” stainless steel requires no heat treatment or plating!
“I want to eliminate heat treatment for SK4 and SUS420”
“I want material harder than SUS303”
“I
want HRC 40-range material” – this material is perfect.
Features of ASK-8000
No Heat Treatment × High Corrosion Resistance × High Hardness
-
Hardness
HRC 45 achievable at material stage
Machinability
Comparable to SUS303
Cost
Reduced outsourcing and production costs through process reduction
Corrosion Resistance
Equivalent to SUS303, SUS630
Environment
Eco-friendly material eliminating unnecessary processes like quenching and
plating
Corrosion Resistance
Equivalent to SUS303/SUS630 in salt spray test
Hardness
HRC 45 design possible depending on diameter
Hardness after Use
Hardness increases when force is applied
Machinability
Despite its hardness, it’s easy to cut (similar to SUS303)
① Material: φ10.00
② Insert: Mitsubishi Materials VP15TF
③ Depth of Cut: 1.0 mm
④ Feed Rate: 0.04 mm/rev
⑤ Cutting Speed: 150 m/min
* Machinability index is based on SUS304 cutting resistance set at 100
* A higher index indicates better machinability
Widely Used by Many Customers
Automobiles (2-wheel & 4-wheel), OA equipment, medical devices, motors, hinges, shafts, and more
Examples of Products Using ASK-8000
| Industry | Part Application | Previous Steel Grade | Effect of Using ASK-8000 |
|---|---|---|---|
| OA | Multifunction Printer | SUS420F | Heat treatment eliminated |
| Financial Devices | ATM | SUS303, SUS420F2 | Increased hardness, heat/plating eliminated |
| Automotive (2W/4W) | Gauge Pointer Shaft | SK95F | Heat/plating eliminated |
| ATD Transmission | S45C | Heat treatment eliminated, improved surface finish | |
| Throttle Valve | SUS440C | Heat treatment eliminated, improved surface finish | |
| Equipment / Machinery | Shock Absorber | SUS440C, SUS303 | Heat treatment eliminated, increased hardness |
| Positioning Pin | SUS304 | Increased hardness | |
| LCD Processing Jig | SUS304 | Increased hardness | |
| Medical | Dental Handpiece | SUS303 | Suppresses heat buildup from vibration |
| Dental Drill | SUS420J2 | Heat treatment eliminated, improved corrosion resistance | |
| Other | Fishing Tackle (Reel) | SUS420F | Heat treatment eliminated |
| Gaming Machine | SUS303Cu, SUS304 | Improved wear resistance |
Adoption Pattern (1)
By switching from materials such as S45C, SK95, SUS420F, SUS420J2, and SUS440C that require quenching and subsequent surface treatment, multiple steps can be eliminated, reducing lead time and lowering costs.
Case Example
| Issue | The quenching process was a bottleneck causing delivery delays. As a result, there was also an issue of excess inventory of intermediate semi-finished products. |
|---|---|
| Material | SUS420J2 → ASK-8000 |
| Process | Cutting → Quenching → Plating |
| Shape | Shaft |
| Effect | Over 50% reduction in production lead time |
| 10% reduction in part cost |
Application Pattern (2)
Switch from SUS303/SUS304 to increase part strength while keeping same process
Material Data
Chemical Composition (wt%)
C 0.15~0.25, Si ≦0.50, Mn 7.50~9.50, P ≦0.05, S ≧0.12, Ni 1.50~3.00, Cr 13.00~15.00
Physical Properties
Density (g/cm³): 7.8
Young’s Modulus (KN/mm²): 199
Poisson’s Ratio: 0.26
Thermal Expansion
(10⁻⁶/°C): 16.6
Thermal Conductivity (W/m·℃): 14.9 (RT), 15.5 (100℃)
Specific Heat (J/g·℃):
0.52 (0–100°C)
Electrical Resistivity (Ω·m×10⁸): 66