Hot-work tool steel and a process for making a hot-work tool steel
a technology of hot-work tool steel and low-chromium hot-work steel, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems that high-speed steel differs from hot-work steel in composition and price, and cannot be used as a substitute for hot-work steel, so as to improve tempering resistance and improve the property profile
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example 1
[0080]In Table 2 below the chemical compositions in percent by weight of three different alloys N0.05; N0.10 and N0.30. are presented. N0.05 designates a material having a nitrogen content of 0.05 wt-%, and so on. Note that these are the actual compositions of the trial ingots.
[0081]The aim was to keep the level of all alloying elements except carbon and nitrogen constant. Compared to the standard low chromium hot-work tool steel of Table 1, chromium was also slightly decreased. There was a small decrease in molybdenum content and an increase in manganese content. For carbon and nitrogen, the aim was to have a constant sum of around 0.40 wt-% of these elements, and this was relatively well achieved.
TABLE 2MaterialCNCrMoVMnSiFeN0.050.380.051.702.771.201.090.3092.5N0.100.270.101.532.321.201.850.2692.5N0.300.080.321.512.201.201.880.2992.5
[0082]The tempering stage concerns mainly meta-stable phases, and previous electron microscopy work has shown that they exist in standard low chromium...
example 2
[0091]The two alloys N0.05 and N0.10 were conventionally cast as small ingots of 50 kg. N0.10 was the first trial and there was no homogenizing treatment done on this ingot before the forging process. The second trial, N0.05, a homogenizing treatment at 1300° C. for 15 hours was applied before forging. The third alloy, N0.30 had a too high nitrogen content to be manufactured by conventional casting. Therefore this alloy was produced using powder metallurgy. First the steel powder was manufactured and then this powder was nitrided in solid state by pressurized N2-gas. The powder was then hot isostatically pressed (HIP) at 1150° C. with the pressure of 76 MPa.
[0092]All three ingots were forged at 1270° C. and then samples were cut out with the dimensions: 15×15×8 mm. The samples where heat treated by first soft annealing at 820° C.; the sequence for cooling after annealing is 10° C. per hour to 650° C. and then free cooling in air. After soft annealing, N0.05 was austenitized at 1100°...
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