Abstract: A bearing steel includes 1.0 to 1.3 wt % carbon; 0.9 to 1.6 wt % silicon; 0.5 to 1.0 wt % manganese; 1.5 to 2.5 wt % nickel; 1.5 to 2.5 wt % chromium; 0.2 to 0.5 wt % molybdenum; 0.01 to 0.06 wt % aluminum; 0.01 to 0.1 wt % copper; at least one selected from the group consisting of more than 0 wt % and less than 0.38 wt % vanadium and more than 0 wt % and less than 0.02 wt % niobium; and a balance of iron.

Abstract: Disclose is an alloy composition for bearing steel having improved fatigue durability and a method of manufacturing the bearing steel comprising the same. The alloy composition comprises: based on a total weight of the alloy composition, an amount of about 0.8 to 1.0 wt % of carbon (C), an amount of about 0.35 to 0.9 wt % of silicon (Si), an amount of about 0.5 to 1.0 wt % of manganese (Mn), an amount of about 0.6 to 1.5 wt % of nickel (Ni), an amount of about 1.2 to 1.55 wt % of chromium (Cr), an amount of about 0.2 to 0.5 wt % of molybdenum (Mo), an amount of about 0.01 to 0.06 wt % of aluminum (Al), an amount of about 0.01 to 0.1 wt % of copper (Cu), and iron (Fe) constituting the balance of the weight of the alloy composition. Preferred alloy composition can provide improved strength, hardness, and fatigue life due to spheroidized carbide complex.

Abstract: Disclosed is a coating material for parts of an engine exhaust system and a method for manufacturing the same. The coating material includes a second junction layer made of CrN or Ti(C)N, a support layer made of TiAlN/CrN disposed on a surface of the second junction layer, and a functional layer made of TiAlN/CrSiN or TiAlN/CrSiCN disposed on a surface of the support layer. The coating material improves abrasion resistance and seizure resistance of the parts of the engine exhaust system.

Abstract: Disclosed is a coating material for aluminum die casting and a method for coating the same, the coating material including: a CrN adhesion layer formed on a surface of a base material; a TrAlN/CrN support layer formed on a surface of the CrN adhesion layer; and a TiAl(CrSi)VCN functional layer formed on a surface of the TiAlN/CrN support layer. The present coating material solves the hot stamping and sticking problem of a conventional aluminum die casting mold and the like, enhances thermal resistance, and further has enhanced thermal resistance, high-temperature wear resistance, sticking resistance and thermal impact resistance compared to that of a conventional coating material.

Abstract: Disclosed are a coating layer having excellent low-friction ability at a high temperature and a method of forming the coating layer. The high-temperature low-fiction coating layer may improve heat resistance, fatigue resistance, low-friction ability, and seizure resistance of the turbine wheel of a turbocharger and the parts sliding at a high temperature in the exhaust system of an engine, improve turbo-lag, and improve durability of the high-temperature parts in the exhaust system of an engine.

Abstract: Disclosed is a coating material for parts of an engine exhaust system and a method for manufacturing the same. The coating material includes a second junction layer made of CrN or Ti(C)N, a support layer made of TiAlN/CrN disposed on a surface of the second junction layer, and a functional layer made of TiAlN/CrSiN or TiAlN/CrSiCN disposed on a surface of the support layer. The coating material improves abrasion resistance and seizure resistance of the parts of the engine exhaust system.

Abstract: Disclosed is a coating material for an aluminum die casting mold and a method for manufacturing the same. More particularly, the coating material for an aluminum die casting mold is provided, which is formed on a surface of a base material, and which sequentially comprises a Cr(Si) or Ti layer, a Cr(Si)N or Ti(C)N adhesion layer, a TiAlN/Cr(SiC)N nano-multilayer, and a Cr(SiC)ON layer. The coating material provides superior heat resistance, high temperature stability, and sticking resistance as compared to conventional CrN, TiAlN and AlCrN coating materials, thus extending the lifespan of the mold.

Abstract: Disclosed is a method for manufacturing a plurality of valve train parts using metal powder injection molding, comprising: obtaining a raw material for injection molding by mixing a metal powder and a binder; forming a formed body by injecting the obtained raw material for injection molding into a mold of a valve train part shape; solvent extracting the formed body; forming a sintered body by debinding and sintering the solvent extracted formed body; sizing processing the sintered body; vacuum carburizing the sizing processed sintered body; and polishing the vacuum carburized sintered body.

Abstract: Disclosed is a coating material for aluminum die casting and a method for coating the same, the coating material including: a CrN adhesion layer formed on a surface of a base material; a TrAlN/CrN support layer formed on a surface of the CrN adhesion layer; and a TiAl(CrSi)VCN functional layer formed on a surface of the TiAlN/CrN support layer. The present coating material solves the hot stamping and sticking problem of a conventional aluminum die casting mold and the like, enhances thermal resistance, and further has enhanced thermal resistance, high-temperature wear resistance, sticking resistance and thermal impact resistance compared to that of a conventional coating material.

Abstract: Disclosed is a coating material for an aluminum die casting mold and a method for manufacturing the same. More particularly, the coating material for an aluminum die casting mold is provided, which is formed on a surface of a base material, and which sequentially comprises a Cr(Si) or Ti layer, a Cr(Si)N or Ti(C)N adhesion layer, a TiAlN/Cr(SiC)N nano-multilayer, and a Cr(SiC)ON layer. The coating material provides superior heat resistance, high temperature stability, and sticking resistance as compared to conventional CrN, TiAlN and AlCrN coating materials, thus extending the lifespan of the mold.

Abstract: The present invention provides a valve for an engine and a method for treating the surface thereof. The valve for the engine includes a buffer layer, an intermediate layer, a TiAlN/CrN first nanostructured multilayer, and a TiAlCN/CrCN second nanostructured multilayer. The buffer layer is coated over a surface of a stem part as a lowermost layer and is formed of Ti or Cr. The intermediate layer is coated over the buffer layer and is formed of CrN, TiN, or TiCN. The TiAlN/CrN first nanostructured multilayer is coated over the intermediate layer. The TiAlCN/CrCN second nanostructured multilayer is coated over the TiAlN/CrN first nanostructured multilayer as an uppermost layer.

Abstract: The present disclosure provides a multi-layer tool piece coating. For example, the tool piece may be a mold or die used for forming ultra high strength steel sheet. The multi-layer mold coating may include a CrN or Ti(C)N junction layer, a first TiAlN/CrN nano multilayer, and a second TiAlCN/CrCN nano multilayer. The CrN or Ti(C)N junction layer may be coated on a base material of the tool piece (e.g., a mold) for forming the steel sheet. The first TiAlN/CrN nano multilayer may be coated on the CrN or Ti(C)N junction layer as an intermediate layer. The second TiAlCN/CrCN nano multilayer may be coated on the first TiAlN/CrN nano multilayer as an outermost surface functional layer, and may include carbon (C) of about 1 at. % to about 30 at. % for high temperature and low friction.

Abstract: Disclosed is a coating material for parts of an engine exhaust system and a method for manufacturing the same. The coating material includes a second junction layer made of CrN or Ti(C)N, a support layer made of TiAlN/CrN disposed on a surface of the second junction layer, and a functional layer made of TiAlN/CrSiN or TiAlN/CrSiCN disposed on a surface of the support layer. The coating material improves abrasion resistance and seizure resistance of the parts of the engine exhaust system.

Abstract: Disclosed is a coating material for an aluminum die casting mold and a method of manufacturing the coating material. The coating material includes a CrN bonding layer formed on a surface of a substrate, a TiAlN/CrN nano multi-layer disposed on a surface of the CrN bonding layer, and a TiAlN/CrSi(C)N nano multi-layer disposed on a surface of the TiAlN/CrSiCN nano multi-layer. The coating material for an aluminum die casting mold may maintain the physical properties of a mold under a high temperature environment due to the superior seizure resistance, heat resistance and high-temperature stability of the coating material, thereby extending the lifespan of the mold.

Abstract: Disclosed is a coating material for intake/exhaust valves and a method for manufacturing the same. The coating material comprises: a Cr or Ti bonding layer formed on a mother material which makes up the intake/exhaust valve; a WC, CrN, TiN or TiCN support layer that is disposed on a surface of the boding layer; and a Si-DLC or SiO-DLC functional layer that is disposed on a surface of the support layer. According to the present invention, wear resistance and heat resistance of the valve are improved.

Abstract: Disclosed is a method for manufacturing a plurality of valve train parts using metal powder injection molding, comprising: obtaining a raw material for injection molding by mixing a metal powder and a binder; forming a formed body by injecting the obtained raw material for injection molding into a mold of a valve train part shape; solvent extracting the formed body; forming a sintered body by debinding and sintering the solvent extracted formed body; sizing processing the sintered body; vacuum carburizing the sizing processed sintered body; and polishing the vacuum carburized sintered body.

Abstract: The present disclosure provides a multi-layer tool piece coating. For example, the tool piece may be a mold or die used for forming ultra high strength steel sheet. The multi-layer mold coating may include a CrN or Ti(C)N junction layer, a first TiAlN/CrN nano multilayer, and a second TiAlCN/CrCN nano multilayer. The CrN or Ti(C)N junction layer may be coated on a base material of the tool piece (e.g., a mold) for forming the steel sheet. The first TiAlN/CrN nano multilayer may be coated on the CrN or Ti(C)N junction layer as an intermediate layer. The second TiAlCN/CrCN nano multilayer may be coated on the first TiAlN/CrN nano multilayer as an outermost surface functional layer, and may include carbon (C) of about 1 at. % to about 30 at. % for high temperature and low friction.

Abstract: Disclosed is a coating material for an aluminum die casting mold and a method of manufacturing the coating material. The coating material includes a CrN bonding layer formed on a surface of a substrate, a TiAlN/CrN nano multi-layer disposed on a surface of the CrN bonding layer, and a TiAlN/CrSi(C)N nano multi-layer disposed on a surface of the TiAlN/CrSiCN nano multi-layer. The coating material for an aluminum die casting mold may maintain the physical properties of a mold under a high temperature environment due to the superior seizure resistance, heat resistance and high-temperature stability of the coating material, thereby extending the lifespan of the mold.

Abstract: The present invention provides a valve for an engine and a method for treating the surface thereof. The valve for the engine includes a buffer layer, an intermediate layer, a TiAlN/CrN first nanostructured multilayer, and a TiAlCN/CrCN second nanostructured multilayer. The buffer layer is coated over a surface of a stem part as a lowermost layer and is formed of Ti or Cr. The intermediate layer is coated over the buffer layer and is formed of CrN, TiN, or TiCN. The TiAlN/CrN first nanostructured multilayer is coated over the intermediate layer. The TiAlCN/CrCN second nanostructured multilayer is coated over the TiAlN/CrN first nanostructured multilayer as an uppermost layer.

Abstract: Disclosed is a piston ring having a multi-layer coating. The piston ring includes a buffer layer, a intermediate layer, a TiAlN/CrN nano multilayer, and a TiAlCN layer. The buffer layer is coated over a base material of a piston ring. The intermediate layer is coated over the buffer layer. The TiAlN/CrN nano multilayer is coated over the intermediate layer. The TiAlCN layer is coated over the TiAlN/CrN nano multilayer as an outermost surface layer.