Extreme-environment-resistant high-strength high-toughness and low-carbon martensite cast steel and preparation method thereof
A low-carbon martensitic, high-strength and high-toughness technology, applied in the field of extreme environment-resistant high-strength, high-toughness low-carbon martensitic cast steel and its preparation, to achieve the effects of good strength and toughness matching, good strength and toughness matching, and low carbon equivalent
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Embodiment 1
[0030] Mix pure iron, metal chromium and metal nickel into the bottom of the crucible, and metal molybdenum is scattered in the upper part of the crucible. Pull low vacuum and heat to complete melting within 20 minutes, then control the temperature at 1600°C, control the vacuum degree at less than 0.1Pa and keep it for 30 minutes, then stop heating and keep it for 15 minutes, then add high-carbon silicon and ferromanganese. While adding, pour argon into the furnace to -0.02MPa, and adjust the temperature at 1560°C for casting. The chemical composition of the obtained cast steel is C: 0.01%, Cr: 10.0%, Ni: 4.5%, Mo: 3.0%, Si: 0.2%, Mn: 0.3%, P: ≤0.01%, S: ≤0.01%, the balance for iron. The metallographic structure of cast steel obtained after pouring is as follows: figure 1 As shown, the alloy consists of ferrite, pearlite, a small amount of martensite and carbides. The matrix structure is ferrite, pearlite and a small amount of martensite, which is transformed from primary a...
Embodiment 2
[0033]Put low-sulfur iron, ferrochrome, and electrolytic nickel into the bottom of the crucible, and ferromolybdenum is scattered in the upper part of the crucible. While drawing a low vacuum, heat it up to complete melting within 20 minutes, then control the temperature at 1650°C, control the vacuum degree at less than 0.1Pa and keep it for 10 minutes, then stop heating and keep it for 5 minutes, then add high-carbon ferrosilicon and metal manganese. While adding, pour argon into the furnace to -0.1MPa, and adjust the temperature at 1570°C for casting. The chemical composition of the obtained cast steel is C: 0.2%, Cr: 13.0%, Ni: 6.5%, Mo: 5.0%, Si: 0.5%, Mn: 0.5%, P: ≤0.01%, S: ≤0.01%, balance for iron. The casting obtained by casting is heated from room temperature to 1200 ° C, and cooled to room temperature with compressed air after keeping the temperature for 2 hours. Then rise from room temperature to 1250°C, keep warm for 1 hour and then air cool to room temperature. ...
Embodiment 3
[0036] Mix high-carbon ferrochromium, ferrosilicon, ferromanganese, low-nitrogen ferrochrome and high-purity nickel into the bottom of the crucible, and molybdenum-chromium rods are scattered in the upper part of the crucible. While drawing a low vacuum, heat it up to complete melting within 20 minutes, then control the temperature at 1630°C, control the vacuum degree at less than 0.1Pa and keep it for 20 minutes, then stop heating and keep it for 10 minutes, then add metal silicon particles and electrolytic manganese flakes. While adding, pour argon into the furnace to -0.05MPa, and adjust the temperature to 1580°C for casting. The chemical composition of the obtained cast steel is C: 0.16%, Cr: 12.0%, Ni: 5.5%, Mo: 4.2%, Si: 0.3%, Mn: 0.4%, P: ≤0.01%, S: ≤0.01%, balance for iron. Heat the casting obtained by casting from room temperature to 1160°C, keep it warm for 3 hours, and then cool it to room temperature with oil. Then rise from room temperature to 1100°C, keep warm ...
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