Preparation method of vermicular graphite cast iron automobile exhaust manifold
A technology for vermicular graphite cast iron and automobile exhaust, which is applied in foundries, casting equipment, casting molding equipment, etc., can solve the problems of large amount of rare earths, difficult grinding and high production cost, and achieves small amount of rare earths and good ventilation conditions. , The effect of low production cost
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[0049] Example 1. A compacted graphite cast iron automobile exhaust manifold is characterized in that it comprises the following steps:
[0050] Step 1: According to the weight ratio, prepare 30kg of scrap steel and 35kg of recycled material for every 100kg of pig iron, and add part of the pig iron, all scrap and all recycled material into the low-frequency induction furnace to melt.
[0051] Step 2: Pass argon into the low-frequency induction furnace, add nickel plate and recarburizer; the amount of nickel plate added is 0.05% of the total weight of the solution; control the amount of recarburizer added, so that the carbon content of the solution is 3.6 %; where the carbon equivalent needs to be maintained at 4.07%, the carbon equivalent = the mass percentage of carbon + (the mass percentage of silicon / 3); after all the nickel is melted, the slag is removed for use.
[0052] Step 3: Lay a layer of ferrosilicon on the bottom of the intermediate frequency induction furnace to form a ...
Example Embodiment
[0071] Example 2. A compacted graphite cast iron automobile exhaust manifold is characterized in that it comprises the following steps:
[0072] Step 1: According to the weight ratio, prepare 25kg of scrap steel and 35kg of recycled material for every 100kg of pig iron, and add part of the pig iron, all scrap and all recycled material into the low-frequency induction furnace to melt.
[0073] Step 2: Pass argon into the low-frequency induction furnace, add nickel plate and recarburizer; the amount of nickel plate added is 0.06% of the total weight of the solution; control the amount of recarburizer added, so that the carbon content of the solution is 3.65 %; The carbon equivalent needs to be maintained at 4.08%, the carbon equivalent = the mass percentage of carbon + (the mass percentage of silicon / 3); after all the nickel is melted, the slag is removed for use.
[0074] Step 3: Lay a layer of ferrosilicon on the bottom of the intermediate frequency induction furnace to form a ferro...
Example Embodiment
[0090] Example 3. A compacted graphite cast iron automobile exhaust manifold is characterized in that it comprises the following steps:
[0091] Step 1: According to the weight ratio, prepare 20kg of steel scrap and 30kg of reclaimed material for every 100kg of pig iron, and add part of the pig iron, all the scrap and all the reclaimed material into the low-frequency induction furnace to melt.
[0092] Step 2: Pass argon into the low-frequency induction furnace, add nickel plate and recarburizer; the amount of nickel plate added is 0.07% of the total weight of the solution; control the amount of recarburizer added, so that the carbon content of the solution is 3.75 %; The carbon equivalent needs to be maintained at 4.07-4.35 %, the carbon equivalent = the mass percentage of carbon + (the mass percentage of silicon / 3); after all the nickel is melted, the slag is removed for use.
[0093] Step 3: Lay a layer of ferrosilicon on the bottom of the intermediate frequency induction furnace...
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