SHS9700U is an iron-based steel alloy with a near nanoscale (submicron) microstructure that features exceptional abrasive wear resistance with superior toughness and no high-cost nickel, tungsten and molybdenum in material chemistry.
- 67 – 70 HRc in a single weld deposit
- ASTM G65-04 Procedure A typical mass loss 0.13g
- Cost effective: contains no tungsten, molybdenum and nickel
- Provides exceptional wear resistance lasting significantly longer than most chrome carbide and complex carbide alloys
- High resistance to abrasion while maintaining high toughness
- Crystalline microstructure is engineered to submicron (400 nm) size
- Maintains high hardness after exposure to elevated temperatures
SHS9700U is a multicomponent steel alloy with a unique uniform glass-forming melt chemistry that allows high undercooling to be achieved during welding. This results in considerable refinement of the crystalline microstructure down to a near nanosize (submicron) range. Unlike conventional weld overlay materials which are macrocomposites containing hard particles and general carbides in a binder, the refined microstructure of SHS9700U is a uniformly hard matrix when welded and does not incorporate distinct hard particles in a binder. This allows SHS9700U to provide vastly improved hardness and wear resistance that lasts significantly longer than conventional macrocomposites. Additionally, SHS9700U is an iron-based alloy without tungsten carbide particulates.
The micrograph to the right shows how 69 HRC hardness develops within microns of the SHS9700U weld overlay interface. HRC hardness values in the micrograph were measured from a single pass SHS9700U weld overlay applied to A36 steel substrate.
EXTREME ABRASION/EROSION RESISTANCE
SHS9700U can be built up in as many weld passes as necessary with the second and subsequent layers providing maximum wear resistance of typical 0.13g mass loss in ASTM G65-04 Abrasion Tests.
The superior toughness of SHS9700U occurs from the in-situ formation of high-volume fraction of refined complex borocarbide phases during welding which are surrounded by ductile phases. The borocarbide phases, which form during solidification, are completely wetted by the matrix and prevent premature pull-out, delamination and crack nucleation. The refined nature of the borocarbide phases allows the reduction of stress concentration sites and the ductile matrix supplies effective crack blunting and bridging.