SUN550 Material
SUN550 is an innovative new material for blades and end bits. This material uses micro-alloying in combination with advanced heat treatment to achieve exceptional wear resistance with no trade-off in toughness. After heattreatment, the highly refined microstructure can reach up to 56 HRC.
| Material | Chemical element% (Max) | |||||||||
| C | Si | Mn | P | S | Cr | Cu | Al | Ni | Mo | |
| SUN550 | 0.38 | 0.35 | 1.40 | 0.025 | 0.025 | 0.60 | 0.3 | 0.07 | 0.30 | 0.10 |
Mechanical properties
| Material | Products | mechanical properties | ||||
| hardness | charpyimpact test(20 C, U-type notch) | tensile strength(MPa) | yield strength(MPa) | elongation δ(%) | ||
| SUN550 | Ultra wear-resistant blade | 52～56HRC | 45J | ≥1750 | ≥1580 | ≥9 |
SUN550 MICROSTRUCTURE
0.1% residual austenite rate, far lower than the national standard of 3%
More stable metallurgical structure performance
Ductile impact fracture from 20℃ down to -50℃
Refined martensite slats, level 8.5
SUN550 CASE STUDY
20-25% improved wear life
Experimental working condition
Green products are SUN550 and yellow products are SUN500 (27 Mn TiB)
bulldozer
Experimental product: blade end bits
Experimental condition: full stone
condition (see left picture) Working hours: 337 hours
