KWS4MA
Our original material ‘KWS4MA’：replacement material of SUS440C
This is martensitic stainless and be high Abrasion resistance with heat treatment.
Please contact us if you need more details.
KWS4MA Characteristic
| Wear and abrasion resistance | Hardness as SUS440C over HV700 |
| Corrosion resistance | As SUS440C |
| Abrasion resistance | Higher abrasion resistance than SUS440C |
| Price | About 2/3 cost of SUS440C |
Comparison chart with other metal
Component, Mechanical properties and physical properties
Table of component
| Material | C | Si | Mn | P | S | Ni | Cr | Mo | N |
| KWS4MA | 0.45～0.55 | Under0.80 | Under0.80 | Under0.040 | Under0.030 | Under0.06 | 12.5～14.00 | - | - |
| SUS440C | 0.95～1.20 | Under1.00 | Under1.00 | Under0.040 | Under0.030 | Under0.06 | 16.00～18.00 | Under0.75 | - |
| SUS420J2 | 0.26～0.40 | Under1.00 | Under1.00 | Under0.040 | Under0.030 | Under0.06 | 12.00～14.00 | - | - |
Mechanical properties and physical properties
| Material |
Hardness HV |
Density g/cm3 |
Longitudinal elastic modulus ×104N/mm2 |
Specific heat J/(g･k) |
Heat conductivity W/(m･k) |
Heat expansion coefficient ×10－6/℃ |
Electrical
resistivity |
Magnetic permeability |
| KWS4MA | 600～800 | 7.75 | 20.6 | 0.46 | 24.7 | 10.6 | 67 | Hard magnetism |
| SUS440C | 600～800 | 7.75 | 20.5 | 0.46 | 24.2 | 10.6 | 60 | Hard magnetism |
| SUS420J2 | 500～700 | 7.75 | 20.6 | 0.46 | 25.0 | 10.4 | 56 | Hard magnetism |