Method for smelting high-strength grey-iron cast
A gray cast iron, high-strength technology, applied in the smelting of high-strength gray iron castings, the smelting field of gray iron castings, can solve the problem of high manufacturing cost, achieve the effect of easy management and lower manufacturing cost
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Embodiment 1
[0023] A method for smelting high-strength gray iron castings: the gray iron castings are smelted using scrap steel with the grade of Q235, pig iron with the grade of Q10 and recycled materials as raw materials; the specific steps of smelting are:
[0024] (1) First add 0.8% ferromanganese and 10% pig iron with grade Q10 into the intermediate frequency induction furnace, then add 2.5% recarburizer and 60% scrap steel with grade Q235 at the same time, and finally add 30% of the returned material for smelting ;
[0025] (2) When the molten iron is smelted to 3 / 4 of the volume of the induction furnace, add 0.6% silicon carbide to the induction furnace and add gray iron back to the furnace until the furnace is full, then smelt to form molten iron;
[0026] (3) When the heating in step 2 is raised to 1440-1460°C, use a carbon-sulfur meter to measure the C content in the molten iron at 3.00-3.10%;
[0027] (4) After heating the original molten iron in step 2 to 1500-1520°C, adju...
Embodiment 2
[0033] The amount of ferromanganese added is 0.9%, the amount of silicon carbide added is 0.65%, the amount of silicon zirconium inoculant added is 0.55%, and the smelting method is carried out according to the smelting method described in Example 1.
[0034] According to the smelting method of this embodiment, the content of each component of the smelted raw molten iron satisfies: C: 3.00-3.10%, Si: 1.30-1.40%, Mn: 0.6%-0.9%, P≤0.05%, S: 0.08-0.010 %;
[0035] The content of each component of the final molten iron meets the requirements: C: 3.00-3.10%, Si: 1.70-1.80%, Mn: 0.6%-0.9%, P≤0.05%, S: 0.08-0.010%.
[0036] The test results of the smelted gray iron castings in this embodiment show that the tensile strength reaches 281, the surface hardness reaches 228, and the pearlite content is 98.5%.
Embodiment 3
[0038] The amount of ferromanganese added is 1%, the amount of silicon carbide added is 0.7%, the amount of silicon zirconium inoculant added is 0.6%, and the smelting method is carried out according to the smelting method described in Example 1.
[0039] According to the smelting method of this embodiment, the content of each component of the smelted raw molten iron satisfies: C: 3.00-3.10%, Si: 1.30-1.40%, Mn: 0.6%-0.9%, P≤0.05%, S: 0.08-0.010 %;
[0040] The content of each component of the final molten iron meets the requirements: C: 3.00-3.10%, Si: 1.70-1.80%, Mn: 0.6%-0.9%, P≤0.05%, S: 0.08-0.010%.
[0041] The test results of the smelted gray iron castings in this embodiment show that the tensile strength reaches 277, the surface hardness reaches 236, and the pearlite content is 98.9%.
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