Composição Química
| C | Mn | Cr | W | V |
| 0,50 | 0,25 | 1,50 | 2,00 | 0,20 |
GENERAL
Main feature Gnee S1 steel has high impact resistance over a wide range of hardness. Therefore, it can be used in hot or cold working applications. It has good resistance to fatigue and wear. In special cases it can be cemented to optimize the compromise between its high hardness and the wear resistance of the surface.
Supply conditions – Supplied in annealed state with an approximate hardness of 230 HB.
APPLICATIONS
It is used in the manufacture of chisels, chisels, knives for cutting steel plates, dies by stamping, cold stamping. In hot work it is used in punches, grinding knives, support hammers for forging, molds for plastics, pneumatic hammers, tools for repression and concrete exercises.
HEAT TREATMENT
Stress relief: In tools of complex shapes, the removal of heterogeneous material in roughing, sudden changes in sections, etc., stress relief treatment should be carried out to minimize dimensional and shape variations during tempering and tempering. The treatment should be done at a temperature of 650 ° C for at least 1 hour for every 25 mm and then cool the air calmly.
Tempering: When heating during austenization to perform preheating to ensure temperature uniformity and minimize distortion. Preheat the oven to 650 ° C. Austenize at a temperature between 900 – 960 ° C. Heat for 1 hour for every 25 mm thickness and add an additional 1 hour for every 25 mm. Preferably cooling oil.
Tempering: It should be done immediately after tempering when the temperature reaches about 70ºC The tempering temperature should be selected according to the desired hardness. To do this use the tempering curve for orientation below. Maintain the tempering temperature for at least 1 hour for every 25 mm thickness and use at least twice as much tempering. This steel can be a hardness level of 40-56 HRC temperament. higher tempering temperatures, lower hardness, lead to greater fracture resistance. When the tool is undergoing surface nitriding treatment or coating, high temperature tempering should be chosen.
Cooling of 950 ° C. double tempering of 2 hours each.
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