Vanadium-titanium-containing ductile cast iron material and thermal treatment process
A technology of nodular iron, vanadium and titanium, applied in the field of casting processing, to achieve the effect of reducing the austenitization temperature, eliminating potential safety hazards, and uniform as-cast structure
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[0034] Example 1
[0035] A vanadium-containing titanium ductile iron material, calculated by mass percentage, including the following components: C3.20%, Si2.30%, Mn0.96%, Cr0.20%, Cu0.60%, Mo0.80%, V0 .54%, Ti0.3%, Nb0.01%, Mg0.03%, rare earth elements 0.02%, the rest is Fe.
[0036] The production state of the vanadium-containing titanium ductile iron material is a quenching and low-temperature tempering process, which includes the following steps:
[0037] 1) According to the above ratio, molten iron is smelted, spheroidized, and cast into castings;
[0038] 2) Austenitize the casting for heat preservation, the specific operation is: heat the casting made in step 1) at 830℃, the heat preservation time is calculated by D×2min / mm, where D is the maximum thickness of the casting, and the unit is mm;
[0039] 3) Cool the casting in step 2) austenitized and heat preservation in a quenching medium, the quenching medium is a NaCl aqueous solution with a mass concentration of 8%, and the ...
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[0041] Example 2
[0042] A material of vanadium-titanium-containing ductile iron, calculated by mass percentage, includes the following components:
[0043] C3.90%, Si2.93%, Mn2.80%, Cr0.90%, Cu0.90%, Mo1.20%, V0.68%, Ti0.78%, Nb0.09%, P0.045%, S0.028%, Mg0.05%, rare earth element 0.03%, the rest is Fe.
[0044] The process is as follows:
[0045] 1) According to the above-mentioned ratio, molten iron is smelted, spheroidized, and cast into castings.
[0046] 2) Austenitize the casting for heat preservation. The specific operation is: heat the casting made in step 1) at a temperature of 880℃, and the heat preservation time is calculated as D×2min / mm, where D is the maximum thickness of the casting, and the unit is mm.
[0047] 3) Cool the castings in step 2) austenitized and heat preservation in a quenching medium, the quenching medium is a NaCl aqueous solution with a mass concentration of 10%, and the cooling time is calculated according to D×sec / 3mm, where D is the maximum casting ...
Example Embodiment
[0049] Example 3
[0050] A material of vanadium-titanium-containing ductile iron, calculated by mass percentage, includes the following components:
[0051] C3.60%, Si2.5%, Mn1.56%, Cr0.50%, Cu0.70%, Mo1.00%, V0.60%, Ti0.50%, Nb0.05%, P0.02%, S 0.01%, Mg 0.04%, rare earth element 0.025%, and the rest is Fe.
[0052] The process is as follows:
[0053] 1) According to the above ratio, molten iron is smelted, spheroidized, and cast into castings;
[0054] 2) Perform austenitization and heat preservation of the casting. The specific operation is: heat the casting made in step 1) at a temperature of 850℃, and the heat preservation time is calculated by D×2min / mm, where D is the maximum thickness of the casting, and the unit is mm;
[0055] 3) Cool the castings in step 2) austenitizing and heat preservation in a quenching medium, the quenching medium is an aqueous NaCl solution with a mass concentration of 12%, and the cooling time is calculated as D×sec / 3mm, where D is the maximum casting...
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