Cast steel for pressure-bearing elements of slime pump of petroleum drill and exploitation equipment and preparation method thereof
A technology for oil drilling and mud pumps, which is applied in the field of materials, can solve the problems of technical parameters and production costs, etc., and achieve the effects of strong weldability, good impact toughness, good welding performance, and high strength
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[0020] The preparation method of cast steel of the present invention implements according to the following steps:
[0021] Step 1. The ingredients are selected from rust-free and oil-free scrap iron and steel that do not contain a large amount of Ni, Cu, and W, and an appropriate amount of pig iron or graphite blocks are added to control the carbon content at 0.5%-0.6%.
[0022] Step 2. Use basic electric arc furnace melting, oxidation, and reduction "three-stage" steelmaking method for smelting. During the melting stage, oxygen blowing is used to boost the melting and adding active lime to make slag. Add small iron ore to increase the iron oxide in the slag. After the reaction Tilting the furnace to flow slag, so repeated until the phosphorus content is ≤0.015%;
[0023] Step 3, the temperature in the oxidation period is not lower than 1580°C, and the comprehensive oxidation method of blowing oxygen and adding ore is used for decarburization to remove gas and impurities. The...
Embodiment 1
[0033] Step 1. Select 10 tons of rust-free and oil-free scrap iron and steel that does not contain a large amount of Ni, Cu, and W, and add 800 kg of pig iron with a carbon content of 4.2%. The carbon content of the melt test is 0.56%.
[0034] Step 2. During the melting period, blow oxygen to help the melting, add 300-400kg of active lime in batches to make slag, and add 300kg of small iron ore in batches to increase the iron oxide in the slag. After the reaction, tilt the furnace to flow slag, and repeat this for twenty minutes , the phosphorus content of the laboratory analysis is 0.01%;
[0035] Step 3. Heating the temperature to 1580°C, using oxygen blowing and ore comprehensive oxidation method to decarburize, the decarburization speed is controlled at 0.01-0.03% / min, the decarburization time is 25 minutes, and the decarburization amount is 0.38%;
[0036] Step 4. During the reduction period, remove the clean oxidized slag, add lime and fluorite at a ratio of 4:1 to make...
Embodiment 2
[0047] Implement according to step 1-step 5 in embodiment 1, obtain cast steel material final chemical composition (wt%) be: C is 0.29%, Mn is 0.88%, Cr is 0.95%, Mo is 0.27%, and Si is 0.35% %, S is 0.01%, P is 0.016%, Cu is 0.2%, Ni is 0.1%, W is 0.03%, the sum of trace elements is ≤1%, and the balance is Fe, which is within the composition range of the designed casting material.
[0048] After step 6, after the casting is polished, carry out secondary normalizing treatment, heat preservation and normalizing at 900°C for 3.5 hours, then air-cool, and perform shot blasting treatment; then go through the final heat treatment of the casting in step 8, and heat the rough-machined casting to 920 ℃ for 4 hours and then quench the oil; then heat to 650 ℃ for 5.5 hours and then water-cool.
[0049] The mechanical properties of the Kiel test block are: the tensile strength Rm is 820N / mm2, the yield strength ReL is 526N / mm2, the elongation A after fracture is 19%, the reduction of are...
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