Bucket tooth with embodiment the present invention

Bucket tooth with embodiment the present invention

Bucket tooth with embodiment the present invention

The present invention compared with prior art has following characteristics:
1) bucket tooth of the present invention does not contain expensive alloying elements such as molybdenum, nickel, vanadium, and the add-on of chromium, manganese and silicon is also lower, and therefore, lower cost for material reduces by 10~12% than Mn13Cr2 high mangaenese steel cost.
2) bucket tooth of the present invention is after Al, B, Y, K, Ca, Nb, Ti, N and Mg microalloying are handled; Organize obvious refinement; Inclusion significantly reduces, and the mechanical property that causes bucket tooth especially toughness increases substantially, and wherein hardness reaches 56~58HRC; Tensile strength reaches 1820~1870MPa, and non-notch impelling strength reaches 125~135J/cm 2
3) to prepare bucket tooth smelting, casting and thermal treatment process easy in the present invention, and production efficiency is high;
4) bucket tooth hardness of the present invention is high, wear resistance is good, and improve 220~250% than Mn13Cr2 high mangaenese steel its work-ing life, and safe in utilization, reliable.

Below in conjunction with embodiment the present invention is made further detailed description:
Embodiment 1:
Adopt 350 kilograms of medium-frequency induction furnaces to smelt the cast steel bucket tooth material, the bucket tooth weight of cast is respectively 7.2kg and 15.9kg, and concrete technology is following:
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 1582 ℃, adds ferrosilicon, when liquid steel temperature reaches 1601 ℃, add ferromanganese;
2) stokehold is adjusted to branch and temperature is risen to 1644 ℃ after qualified, comes out of the stove after adding silicocalcium, aluminium, nitrogenous substances (nitrogenous ferrochrome), ferrotianium successively;
3) will contain potassium material (KF and CaC 2Product K after thermal reduction reaction, CaF 2And C), ferro-boron and heavy rare earths (yttrium) ferrosilicon magnesium alloy be crushed to the fritter that granularity is 5~10mm, after 180 ℃ of oven dry, places the casting ladle bottom, with pouring method in the bag molten steel carried out the composite inoculating processing;
4) bucket tooth adopts cured die cast moulding, 1463 ℃ of pouring molten steel temperature;
5) pour into a mould the air cooling bucket tooth of unpacking after 1 hour, spruing, cleaning undesirable root, overlap, burr;
6) bucket tooth is heated to 970 ℃ with stove, is incubated after 4 hours, goes into water cooling earlier 15 seconds, goes into oil cooling then 30 minutes, carries out temper at last, 180 ℃ of tempering Heating temperatures, and tempering insulation time 7 hours is come out of the stove air cooling to room temperature with bucket tooth after the tempering.The bucket tooth chemical ingredients is seen table 1, and the bucket tooth mechanical property is seen table 2.
Embodiment 2:
Adopt 350 kilograms of medium-frequency induction furnaces to smelt the cast steel bucket tooth material, the bucket tooth weight of cast is respectively 9.8kg and 23.5kg, and concrete technology is following:
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 1589 ℃, adds ferrosilicon, when liquid steel temperature reaches 1620 ℃, add ferromanganese;
2) stokehold is adjusted to branch and temperature is risen to 1657 ℃ after qualified, comes out of the stove after adding silicocalcium, aluminium, nitrogenous substances (nitrogenous ferrochrome), ferrotianium successively;
3) will contain potassium material (KF and CaC 2Product K after thermal reduction reaction, CaF 2And C), ferro-boron and heavy rare earths (yttrium) ferrosilicon magnesium alloy be crushed to the fritter that granularity is 5~10mm, after 220 ℃ of oven dry, places the casting ladle bottom, with pouring method in the bag molten steel carried out the composite inoculating processing;
4) bucket tooth adopts cured die cast moulding, 1477 ℃ of pouring molten steel temperature;
5) pour into a mould the air cooling bucket tooth of unpacking after 2 hours, spruing, cleaning undesirable root, overlap, burr;
6) bucket tooth is heated to 990 ℃ with stove, is incubated after 2 hours, goes into water cooling earlier 25 seconds, goes into oil cooling then 45 minutes, carries out temper at last, 220 ℃ of tempering Heating temperatures, and tempering insulation time 6 hours is come out of the stove air cooling to room temperature with bucket tooth after the tempering.The bucket tooth chemical ingredients is seen table 1, and the bucket tooth mechanical property is seen table 2.
Embodiment 3:
Adopt 500 kilograms of medium-frequency induction furnaces to smelt the cast steel bucket tooth material, the bucket tooth weight of cast is respectively 38kg and 51kg, and concrete technology is following:
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 1586 ℃, adds ferrosilicon, when liquid steel temperature reaches 1612 ℃, add ferromanganese;
2) stokehold is adjusted to branch and temperature is risen to 1647 ℃ after qualified, comes out of the stove after adding silicocalcium, aluminium, nitrogenous substances (nitrogenous ferrochrome), ferrotianium successively;
3) will contain potassium material (KF and CaC 2Product K after thermal reduction reaction, CaF 2And C), ferro-boron and heavy rare earths (yttrium) ferrosilicon magnesium alloy be crushed to the fritter that granularity is 5~10mm, after 200 ℃ of oven dry, places the casting ladle bottom, with pouring method in the bag molten steel carried out the composite inoculating processing;
4) bucket tooth adopts the cast form of cold-hardening resin sand casting mold, 1470 ℃ of pouring molten steel temperature;
5) pour into a mould the air cooling bucket tooth of unpacking after 4 hours, spruing, cleaning undesirable root, overlap, burr;
6) bucket tooth is heated to 980 ℃ with stove, is incubated after 5 hours, goes into water cooling earlier 20 seconds, goes into oil cooling then 60 minutes, carries out temper at last, 200 ℃ of tempering Heating temperatures, and tempering insulation time 10 hours is come out of the stove air cooling to room temperature with bucket tooth after the tempering.The bucket tooth chemical ingredients is seen table 1, and the bucket tooth mechanical property is seen table 2.
Embodiment 4:
Adopt 500 kilograms of medium-frequency induction furnaces to smelt the cast steel bucket tooth material, the bucket tooth weight of cast is respectively 36kg and 58kg, and concrete technology is following:
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 1587 ℃, adds ferrosilicon, when liquid steel temperature reaches 1609 ℃, add ferromanganese;
2) stokehold is adjusted to branch and temperature is risen to 1653 ℃ after qualified, comes out of the stove after adding silicocalcium, aluminium, nitrogenous substances (nitrogenous ferrochrome), ferrotianium successively;
3) will contain potassium material (KF and CaC 2Product K after thermal reduction reaction, CaF 2And C), ferro-boron and heavy rare earths (yttrium) ferrosilicon magnesium alloy be crushed to the fritter that granularity is 5~10mm, after 205 ℃ of oven dry, places the casting ladle bottom, with pouring method in the bag molten steel carried out the composite inoculating processing;
4) bucket tooth adopts the cast form of cold-hardening resin sand casting mold, 1472 ℃ of pouring molten steel temperature;
5) pour into a mould the air cooling bucket tooth of unpacking after 3 hours, spruing, cleaning undesirable root, overlap, burr;
6) bucket tooth is heated to 985 ℃ with stove, is incubated after 5 hours, goes into water cooling earlier 20 seconds, goes into oil cooling then 50 minutes, carries out temper at last, 210 ℃ of tempering Heating temperatures, and tempering insulation time 8 hours is come out of the stove air cooling to room temperature with bucket tooth after the tempering.The bucket tooth chemical ingredients is seen table 1, and the bucket tooth mechanical property is seen table 2.
Table 1 bucket tooth chemical ingredients (massfraction, %)
Element C Si Mn Cr B Al Y K
Embodiment 1 0.39 0.78 1.22 0.99 0.0021 0.053 0.068 0.033
Embodiment 2 0.43 0.61 1.38 0.87 0.0028 0.064 0.041 0.039
Embodiment 3 0.44 0.75 1.50 0.83 0.0043 0.080 0.055 0.020
Embodiment 4 0.41 0.66 1.43 0.92 0.0035 0.071 0.063 0.027
Element Ca Nb Ti N Mg S P Fe and impurity
Embodiment 1 0.045 0.059 0.030 0.036 0.028 0.008 0.027 Surplus
Embodiment 2 0.049 0.046 0.037 0.055 0.021 0.013 0.024 Surplus
Embodiment 3 0.034 0.031 0.055 0.048 0.039 0.015 0.021 Surplus
Embodiment 4 0.023 0.039 0.045 0.041 0.033 0.010 0.025 Surplus
Table 2 bucket tooth mechanical property
Multi-element low alloy wear resistant cast steel bucket tooth of the present invention excavates in the mine, highway is built and field such as water conservancy construction is widely used, and is safe in utilization, reliable, no broken teeth phenomenon appearance in the use.Bucket tooth hardness of the present invention is high, and wear resistance is good, and improve 220~250% than Mn13Cr2 high mangaenese steel its work-ing life, than containing molybdenum, nickel (35CrMo, 20CrNi2Mo) steel alloy bucket tooth raising 30~50%.Because bucket tooth of the present invention does not contain expensive alloying elements such as molybdenum, nickel, vanadium, and the add-on of chromium, manganese and silicon is also lower, therefore; Bucket tooth material of the present invention is with low cost, reduces by 10~12% than Mn13Cr2 high mangaenese steel cost, reduces by 25~40% than containing Mo-Ni alloy steel bucket tooth cost; Apply bucket tooth of the present invention; Can improve the excavator operation rate, reduce the bucket tooth purchase cost, have good economic benefits.

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