GENERAL
Gnee M2 steel is the most recommended and most used cutting conditions in the manufacture of continuous or intermittent cutting tools. Its chemical composition in tungsten, molybdenum and vanadium ensures a high level of hardness in tempering, over 64.5 HRC, and maintaining high hardness when hot, guarantees an excellent retention of cutting power in service.
Chemical composition - C (0.90) • Mn (0.30) • Si (0.30) • Cr (4.20) • W (6.20) • Mo (5.00) • V (1.90 )
Supply conditions - Supplied in the annealed state with a hardness of approximately 240 HB.
APPLICATIONS
The Gnee M2 is used in common type drills, taps, burs and snails, knives, brushes, reamers, thread rolling combs, etc. It is also used in cold cutting and forming in dies and punches, where tools can be used less hard according to the particular application.
HEAT TREATMENT
Stress relief: In complex shaped tools, 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 quenching and tempering . The treatment should be between 550 to 650 ° C for at least 2 hours and then cool slowly.
Temper : austenize at temperatures between 1190 and 1200 ° C. Cooling time is critical for this steel and must be considered in light of its cross section. It can be hardened in salt baths or in vacuum ovens. Cold air, hot oil, salt bath or nitrogen pressure in a vacuum furnace. During heating to austenitization, 2 preheating should be carried out to ensure temperature uniformity and minimize distortions.
Tempering: It should be done immediately after hardening when the temperature reaches approximately 70ºC. The tempering temperature should be around 550-560ºC. In cold work operations at lower hardness recommended for cutting by elimination bucket, 64-65 HRC should not be practiced increasing the tempering temperature. Lower hardness must be achieved by modifying the austenitizing temperature, the tempering temperature is maintained.
Rapid cooling from 1200 ° C. Double tempering for 2 hours each.
Nitriding: Steel can be nitrided to increase the wear resistance of surface hardening. The maximum hardness after nitriding is the order of 1200HV. The presence of the white layer is highly embrittled.
Finishing: High speed steels are traditionally coated by a PVD (Physical Vapor Deposition) process. Ceramic coating produces films with high hardness, on average 2,000 HV, low coefficient of friction, on average 0.3 compared to steel. These films are important for increasing resistance to abrasive and adhesive wear.
Etiqueta: aisi m2 tubo, suministrador, personalizado, por mayor, barato, descuento, lista de precios, precio bajo, en almacén, muestrario gratis
