Gcr15 steel characteristics
GCR15 steel is mainly developed on the basis of T10A steel. GCR15 steel specialty is as follows:
The addition of CR elements to GCR15 steel is mainly to improve the hardening of steel, while being soluble to the matrix enhanced matrix tissue. In addition, CR elements are dissolved into Fe3C to form composite (Fe, CR) 3C to increase its hardness and increase the hardness and abrasion resistance of steel.
Due to the addition of a single weak carbide forming element CR in the steel, the mechanical properties, abrasion resistance, quenchtability and quenching deformation of GCR15 steel are not as good as CRWMN steel.
Gcr15 Steel Main Chemical Component
0.95%~ 1.05%C, 0.25%~ 0.45%mn, 1.40%~ 1.65%CR, 0.15%~ 0.35%Si, ≤0.025%p, ≤0.025%s.
Gcr15 steel thermal treatment process
GCR15 steel phase variable points are: AC1745 ° C, ACCM900 ° C, AR1700 ° C, MS235 ° C.
The starting temperature of GCR15 steel is 1050 ~ 1100 ° C, and the final forging temperature is 800 ~ 850 ° C. After the forging, cool to 700 ° C, cool down in sand or cool in the pit.
GCR15 Steel Frequently Ascended thermal Treatment Process
Hard treatment process parameter hardness requirements process characteristics
Incontinvable heating at 770 ~ 790 ° C, cooling with the furnace after the preservation to below 550 ° C 187 ~ 229HBS AC1745 ° C, ACCM900 ° C, heating temperature should be between AC1 ~ ACCM between between?
Waitowing the heating heating 770 ~ 790 ° C, 680 ~ 700 ° C as the furnace to cool with the furnace to 550 ° C, and the heating temperature should be between AC1 ~ ACCM. Get granular pearl light tissue
Rehabilitation reduction heating 600 ~ 700 ° C, insulation, empty cold 187 ~ 229HBS eliminate residual stress, eliminate processing hardening
Positive fire heating 930 ~ 950 ° C, heat preservation, empty cold 302 ~ 388HBS heating temperature is higher than ACCM, eliminating bias, band -shaped tissue, mesh tissue, refined grain grains
Exercise heating 830 ~ 850 ° C, insulation, oil cold 62 ~ 65HRC quenching heating temperature between AC1 ~ ACCM, the dissolving of CR elements, improvement of quenching, improving the stability of the ignition, and reducing MS points, there are many residues remaining Austenite existence
The temperature quenching of the lower bellies is 830 ~ 850 ° C, 240 ~ 300 ° C nitrate salt bath, and then the bath sky is cold 58 ~ 62HRC MS 202 ° C. A small amount of residual Olympic auscles, the quenching deformation is very small, the strength is high, and the toughness is good
The fire heating is 150 ~ 190 ° C, the heat preservation is 2h, the furnace cold 58 ~~ 62HRC emphasizes the hardness of the hardness, emphasizing the upper limit of the toughness
Gathering quenching: Heating 840 ~ 860 ° C, oil cooling; recovery: Heating 660 ~ 680 ° C. After the heat preservation, the furnace is cold or air -cooled 197 ~ 217HBS high temperature quenching can eliminate the defects of carbonized tissue. Sports tissue, make organizational preparations for re -quenching, while improving the toughness, improve the intensity. Rehabilitation: Heating temperature 820 ~ 840 ℃, oil cold
Double refined treatment of quenching heating 1050 ° C, insulation, 320 ° C at 320 ° C, 2H, empty cold. Heating at 710 ° C and heat preservation for 2h. Then quench 820 ° C, heat preservation, oil cold. Heat again at 230 ° C, thermal insulation 2H 62HRC to obtain a very small quenching tissue, improve the strength of the steel
Solid boron boron -leafing heating 920 ° C, heat preservation 5h, oil cooling. Osmotic: 3%B4C+5%KBF4+5%(NH2) 2CO+87%SIC 1500 ~ 1700HV surface to obtain a high -hardness boron layer, and the heart is a quenching tissue. The thickness of the peak layer is 0.145mm
Liquid chromium seepage heating 950 ° C, 4h insulation, oil -cooled, osmotic: 15%CR2O3+12.5%Rare earth silicone magnesium+72.5%borax 1665HV osmotic layer thickness: 0.01056mm. Improve surface hindrance, abrasion resistance and corrosion resistance
The liquid seepage is heated 950 ° C, the heat preservation is 4h; the cooling is 860 ° C, the heat preservation is 2h; Osmotic: 90%BACL2+7%V2O5+3%NA2B4O7+Al Powder 2500HV0.1 The thickness of the osmotic layer: 0.020mm. Improve surface hardness and abrasion resistance