Co-free composite reinforced secondary hardening ultrahigh-strength steel and preparing method
An ultra-high-strength steel and secondary hardening technology, applied in the field of alloy steel, can solve the problems of poor economy, vulnerability to the impact of the international situation, and reduce Co content, etc., to achieve high economy, save Co element content, and high tempering The effect of stability
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[0040] According to the chemical composition range of the steel of the present invention, a 25 kg vacuum induction furnace is used to prepare a 21 kg alloy ingot 10 furnace. The specific chemical composition is shown in Table 3, and the furnace number is 1 # ~15 # .
[0041] After 15 furnaces are smelted and cast into steel ingots, the first high-temperature homogenization treatment system before forging is: After holding at 1200°C for 10 hours, the temperature is lowered for forging, and the forging heating temperature is 1150°C. The dimensions of forged test bars are: φ15×2000mm, 15×15×2000mm and 25×45×L.
[0042] After forging, the test bar is first subjected to normalizing and annealing heat treatment: normalizing treatment 1050℃×1h, air cooling, annealing treatment 680℃×6h, air cooling. Then send the sample section to process tensile, impact and fracture toughness sample blanks. The final heat treatment is quenching, cryogenic and tempering heat treatment: quenching at 900-10...
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