Heat treatment process improving hot hardness and high temperature abrasion resisting performance of hot mold steel
A technology of thermal hardness and wear resistance, which is applied in the field of heat treatment process to improve the thermal hardness and high temperature wear resistance of hot mold steel, and can solve the problems of inconspicuous effect, high production cost, and unsuitable for small and medium-sized enterprises
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Embodiment 1
[0044] (940℃×4h strong carburizing and then heating to 1040℃, holding 0.5h oil cooling, 580℃×2h and 500℃×1h twice tempering)
[0045] (1) Sample preparation and preparation of strong carbonitriding mixture
[0046] The workpiece material is annealed H11, H13, H21 hot die steel, and the chemical composition of the three test materials is shown in Table 1. The size of the metallographic and hardness workpiece sample is Ф25×6mm, the size of the worn workpiece sample is Ф40×4mm, and the surface roughness of the workpiece sample is 0.8mm;
[0047] According to the weight percentage, the composition of the carbonitriding agent is as follows: charcoal with a particle size of ≤5mm is 4.5kg, urea particles with a particle size of 1mm-2mm is 5.3kg, sodium carbonate powder is 0.15kg, chromic anhydride (CrO 3 ) 0.05kg is mixed to obtain a strong carbonitriding mixture;
[0048] (2) Strong carburizing
[0049] Use 6mm thick 1Cr18Ni9Ti stainless steel plate double-sided welding to make the infiltrat...
Embodiment 2
[0078] (1) Sample and preparation of strong carbonitriding mixture
[0079] The workpiece material is annealed H11, H13, H21 hot mold steel, and the chemical composition of the three test materials is shown in Table 1. The size of the metallographic and hardness workpiece sample is Ф25×6mm, the size of the worn workpiece sample is Ф40×4mm, and the surface roughness of the workpiece sample is 0.8mm;
[0080] According to the weight percentage, the composition of the strong carbonitriding agent is as follows: charcoal with a particle size of ≤5mm is 4.3kg, urea with a particle size of 1mm-2mm is 5.5kg, sodium carbonate powder is 0.12kg, chromic anhydride (CrO 3 ) 0.08kg is mixed to obtain a strong carbonitriding mixture;
[0081] (3) Strong carburizing
[0082] Use 6mm thick 1Cr18Ni9Ti stainless steel plate double-sided welding to make infiltration box, put H11 hot mold steel workpiece, H13 hot mold steel workpiece and H21 hot mold steel workpiece, and carbonitriding strong infiltration...
Embodiment 3
[0088] (1) Sample and preparation of strong carbonitriding mixture
[0089] The workpiece material is annealed H11, H13, H21 hot mold steel, and the chemical composition of the three test materials is shown in Table 1. The size of the metallographic and hardness workpiece sample is Ф25×6mm, the size of the worn workpiece sample is Ф40×4mm, and the surface roughness of the workpiece sample is 0.8mm;
[0090] According to the weight percentage, the composition of the strong carbonitriding agent is as follows: charcoal with particle size ≤ 5mm is 4.8kg, urea particle with particle size of 1mm-2mm is 5.0kg, sodium carbonate powder is 1.4kg, chromic anhydride (CrO 3 ) 0.6kg mixed to obtain a strong carbonitriding mixture;
[0091] (3) Strong carburizing
[0092] Use 6mm thick 1Cr18Ni9Ti stainless steel plate double-sided welding to make infiltration box, put H11 hot mold steel workpiece, H13 hot mold steel workpiece and H21 hot mold steel workpiece, and carbonitriding strong infiltration a...
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