Annealing: Heat to 1650?F (900?C), hold 2 hours, slow cool no faster than 25?F (15?C) per hour to 1100?F (595?C), then furnace cool or cool in still
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Quench: Air or positive pressure quench (2 bar minimum) to below 125?F (50?C), or salt or interrupted oil quench to about 1000?F (540?C), then air
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Austenitize 1950?F (1065?C). Quench to below 125?F (50?C). Double temper at 600?F (315?C) 2 hrs. minimum each temper. Cool to hand warm between
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Annealed Parts: Heat to 1100-1300?F (595-705?C), hold 2 hours, then furnace cool or cool in still air. Hardened Parts: Heat to 25-50?F (15-30?C
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Hardening Preheat: Heat to 1550-1600?F (845-870?C) Equalize.
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Stress relief to prevent warpage: 650°C-680°C hold for 3-5h let cool slowly in oven.
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The grade itself is a hypereutectic steel and with the carbon content of around 1% capable to deliver 66HRC easily, after the quench.
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When tempering at 400-750?F (200-400?C), freezing treatments may be necessary to minimize retained austenite.
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Carbon V chemical composition is equivalent to the SAE standard for construction steels 50 100 (UNS G50986 or the German grade 1.3501)
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Now since you didn't forge or fire weld it, meaning you do stock removal only, you can expect the steel to be annealed correctly.
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Flextest: Check sharpened edge with flex test in case it fails add 10°C to the tempering temperature and try flex test again after 1 h tempering
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Note: avoid tempering temperatures higher than 200°C because the steel will loose to much of its potential and between 200 and 300°C the is a area of
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A freezing treatment - may be used between the first and second tempers. Freezing treatments help to attain maximum hardenability and must always be
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corrosion resistance. Size Change: +0.05 to +0.10% when fully martensitic. The presence of retained austenite may reduce the net growth.
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