[Features]
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Quenching refers to the process of heating metal parts at a high temperature, maintaining their temperature, and letting them cool down immediately in a cooling medium (oil or water).Metal parts are reheated after quenching; this process, which strengthens the metal, is called tempering.The purpose of tempering is to strengthen the internal microstructure of the metal, because the high rigidity obtained through quenching renders the metal brittle before it is reheated. As a result, quenching and tempering are performed as a pair, and thus called quenching and tempering (QT).Â
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[Specifications]
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• Queching and TemperingÂ
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-Quenching : It is a heat treatment process in which the entire austenite or some of it are transformed to martensite
and hardened through immediate cooling after austenitizing steel. The austenitizing temperature for hypoeutectoid steel should be Acz hypoeutectoid steel, and the quenching temperature for it should be set between Ac, and Acm. There are water quenching, oil quenching, martempering, and austempering as quenching methods. Select a
quenching medium and a method, and perform it depending on the materials and product properties.
-Tempering : It is a heat treatment process of reheating a quench-hardened steel below the eutectic tempera  keeping it at that temperature for an appropriate period, and air cooling immediately to improve ductility and toughness, remove residual stress, and stabilize a structure. Feature It is commonly used in the mass-production of small products of 5 kg unit weight or less. It requires fewer personnel due to easy operation through automation. Non-oxidizing is available by using CH3OH, RX-GAS, and DX-GAS for ambient gas.
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• Normalizing
It is a heat treatment proces of cooling the steel after heating the steel up to a proper temperature austenite range above the transformation range (hypoeutectoid steels Ac₃ and hypoeutectoid steel Acm).Â
• ISOthermal Treatment
Stress-relieving annealing heats metal to a proper temperature below the Aâ‚Â temperature in order to remove the residual stress produced in the metal due to forging, casting, machining, andiso welding.Â
• Stress Relieving Annealing(SRA)
Stress-relieving annealing heats metal to a proper temperature below the Aâ‚Â temperature in order to remove the residual stress produced in the metal due to forging, casting, machining, and welding.
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• Sroidizing
Sroidizing is a heat treatment performed to sroidize carbide that has formed inside the steel.As a result of sroidizing, the toughness and machinability of steel is increased.Â
