Multi-element low alloy wear resistant cast steel bucket tooth and preparation method thereof

Multi-element low alloy wear resistant cast steel bucket tooth
The object of the invention provides a kind of multi-element low alloy wear resistant cast steel bucket tooth and preparation method thereof.The present invention adopts a kind of multi-element low alloy wear resistant cast steel to make bucket tooth, and quality adopts cured die cast moulding less than 30 disclosed bucket tooths, and quality is equal to or greater than 30 kilograms of bucket tooths and adopts the cast form of cold-hardening resin sand casting mold.Its principal feature is in the middle carbon cast steel that contains manganese, chromium, silicon, to add an amount of Al, B, Y, K, Ca, Nb, Ti, N and Mg; Make its structure refinement; The middle carbon mechanical properties of cast steel that helps containing manganese, chromium, silicon especially toughness increases substantially, and causes containing the raising of the middle carbon cast steel bucket tooth use properties of manganese, chromium, silicon the most at last.
The object of the invention can be realized through following measure:
The chemical composition of bucket tooth of the present invention be (massfraction, %): 0.39-0.44C, 0.6-0.8Si, 1.2-1.5Mn, 0.8-1.0Cr; 0.0020-0.0045B, 0.05-0.08Al, 0.04-0.07Y, 0.02-0.04K; 0.02-0.05Ca, 0.03-0.06Nb, 0.03-0.06Ti, 0.035-0.055N; 0.02-0.04Mg, P<0.03, S<0.03, surplus is Fe and inevitable trace impurity.
Bucket tooth of the present invention is used electrosmelting, and its manufacturing technology steps is:
1) earlier with ordinary scrap steel, ferrochrome, ferro-niobium and the fusing of carburelant Hybrid Heating, after molten steel melts clearly, when liquid steel temperature reaches 1580~1590 ℃, adds ferrosilicon, when liquid steel temperature reaches 1600~1620 ℃, add ferromanganese;
2) stokehold is adjusted to branch and temperature is risen to 1640~1660 ℃ after qualified, comes out of the stove after adding silicocalcium, aluminium, nitrogenous substances, ferrotianium successively;
3) will contain potassium material, ferro-boron and heavy rare earths ferrosilicon magnesium alloy and be crushed to the fritter that granularity is 5~10mm, after 180~220 ℃ of oven dry, place the casting ladle bottom, and with the method that pours in the bag molten steel carried out composite inoculating and handle;
4) quality adopts cured die cast moulding less than 30 kilograms bucket tooth, and quality is equal to or greater than 30 kilograms of bucket tooths and adopts the cast form of cold-hardening resin sand casting mold, 1460~1480 ℃ of pouring molten steel temperature;
5) pour into a mould the air cooling bucket tooth of unpacking after 1~4 hour, spruing, cleaning undesirable root, overlap, burr;
6) bucket tooth is heated to 970~990 ℃ with stove, is incubated after 2~6 hours, goes into water cooling earlier 15~25 seconds; Went into oil cooling then 30~60 minutes, and carried out temper at last, 180~220 ℃ of tempering Heating temperatures; Tempering insulation time 6~10 hours is come out of the stove air cooling to room temperature with bucket tooth after the tempering.
Above-mentioned nitrogenous substances is nitrogenous ferrochrome, and containing the potassium material is KF and CaC 2Product K after thermal reduction reaction, CaF 2With three kinds of materials of C.Heavy rare earths in the heavy rare earths ferrosilicon magnesium alloy refers to yttrium.
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