CN1313634C - Complex alloy cast-steel excavator bucket teeth and its producing process - Google Patents
Complex alloy cast-steel excavator bucket teeth and its producing process Download PDFInfo
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- CN1313634C CN1313634C CNB2004100986765A CN200410098676A CN1313634C CN 1313634 C CN1313634 C CN 1313634C CN B2004100986765 A CNB2004100986765 A CN B2004100986765A CN 200410098676 A CN200410098676 A CN 200410098676A CN 1313634 C CN1313634 C CN 1313634C
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Abstract
The present invention provides a complex alloy cast-steel excavator bucket tooth and a production technology thereof. The complex alloy cast-steel excavator bucket tooth comprises the following components: 0.22 to 0.45 wt% of C, at most 2.0 wt% of Cr, at most 2.0 wt% of Mn, at most 2.0 wt% of Si, 0.20 to 0.50 wt% of Mo, 0.05 to 0.20 wt% of Ti, and balance of Fe. The excavator bucket tooth is produced by selecting a reasonable casting process and a heat treatment process, and has the advantages of high hardenability, fine toughness, favorable medium-impact abrasion resistance performance, long service life and low cost.
Description
Technical field
The present invention relates to a kind of excavator bucket teeth and production technique thereof, especially relate to a kind of complex alloy cast-steel excavator bucket teeth and production technique thereof, it is to form a kind of excavator bucket teeth by selected chemical ingredients, selected rational pouring technology and thermal treatment process.
Background technology
In known systems, " a kind of manufacture method of high-silicon abrasion resistant steel " of China Patent No. ZL99105 704X for example, its composition % is: C0.6-1.2, Si1.8-3.0, Mo0.2-0.5 be surplus to be Fe.In China Primary Steel 35CrMnSi, its composition weight % is: C0.32-0.39, Cr1.10-1.40, Mn0.80-1.10, Si1.10-1.40 be surplus to be Fe.The excavator bucket teeth of domestic present use is mainly high mangaenese steel, and the high-silicon abrasion resistant of use steel is also arranged.The advantage of the former high mangaenese steel is to use in heavy loading gouging abrasion condition, and the wearing and tearing under medium or low impact load conditions such as excavator bucket teeth, ball grinding machine lining board, high mangaenese steel is because of the not enough advantage that loses its anti-heavy loading gouging abrasion of work hardening.And the impelling strength of high-silicon abrasion resistant cast steel is on the low side, and brittle failure takes place in the use easily, to the actual impelling strength ak of the workpiece of big section＜6J, and the thermal treatment process complexity, needing isothermal quenching, productivity is low, and the technology cost is higher, is difficult to scale operation.
Content of the present invention
The objective of the invention is to overcome the defective of above-mentioned prior art, a kind of excavator bucket teeth and production technique thereof of wear-resistant complex alloy cast-steel manufacturing under medium or low impact load are provided, described complex alloy cast-steel has high hardening capacity, excellent in toughness, impact wear resistance is good, cost is low, and performance and price is excellent characteristic relatively, and this complex alloy cast-steel especially can be used for excavator bucket teeth and ball grinding machine lining board etc.
The objective of the invention is to realize by following technical proposals, according to a first aspect of the invention, complex alloy cast-steel excavator bucket teeth provided by the present invention is such formation, described excavator bucket teeth, for the composition weight % of the complex alloy cast-steel that contains is: C0.22-0.30, Cr1.1-1.4, Mn1.25-1.65, Si1.21-1.58, Mo0.20-0.31, Ti0.05-0.11, surplus are Fe.
The complex alloy cast-steel that the present invention adopts is as the excavator bucket teeth material, and its carbon content is middle low-carbon (LC), and its bainite and martensite have high-strong toughness, are better than the high-silicon abrasion resistant steel, can increase substantially anti-medium impact portative power, and brittle failure does not take place; Its hardness is at HRC48-55, and wear resistance is better than high mangaenese steel under medium or low impact load condition.
According to a second aspect of the invention, the production technique of complex alloy cast-steel excavator bucket teeth provided by the present invention, form by cast bucket tooth technology and thermal treatment process, it is characterized in that: described cast bucket tooth technology, with induction furnace or arc melting complex alloy cast-steel, the composition weight % of described complex alloy cast-steel is: C0.22-0.30, Cr1.1-1.4, Mn1.25-1.65, Si1.21-1.58, Mo0.20-0.31, Ti0.05-0.11, surplus is Fe, adopt vacuum-evaporative pattern casting, sand mo(u)ld or resin sand die cast, opening and watering temperature is 1580-1620 ℃, has watered back foundry goods slow cooling to the room temperature demoulding; Described thermal treatment process comprises the following steps, anneals after bucket tooth has watered, and the control rate of heating is being 60-80 ℃/h below 200 ℃, more than 200 ℃ 100-120 ℃/h, 840-900 ℃ of insulation 3-5 hour, stove was as cold as 680-700 ℃ of insulation 4 hours, and stove is as cold as 500 ℃ and takes out air cooling; Bucket tooth quenches after machining, workpiece is heated to 840-900 ℃ with 100-120 ℃/h, is incubated 3-5 hour, treats coldly 1-2 minute by taking out in the stove, quench then, heat-eliminating medium is a sodium silicate solution, and its proportion is 1.15, and workpiece is chilled to 300 ℃ and takes out air cooling to room temperature, quenching finishes, carry out tempering then immediately, be heated to 240 ℃, be incubated 3-4 hour and take out air cooling with 40-60 ℃/h.
Because the present invention adopts the multicomponent alloy element carry out cda alloyization, and strong carbide forming element Mo, middle strong carbide forming element Cr, weak carbide forming element Mn and non-carbide forming element Si are worked in coordination.With minimum alloying element total amount, improve the suitable property of quenching greatly, in sodium silicate solution, quench, can on the large section, obtain martensite and bainite makes thermal treatment more reliable to the organizational controls of steel.But trace Ti refine austenite crystal grain, this can improve the toughness of steel to the cast steel particularly important.Its yield strength is 950-1100Mpa, and tensile strength is 1450-1650MPa, elongation δ
5Be 6-15%, non-notch impelling strength ak is 95-120J, hardness HRC48-55.Like this, both avoided the fragility of high silicon cast steel, and solved high mangaenese steel again and under medium or low impact load, be difficult to by deformation and bring out the difficulty that phase transformation improves wear resistance.
The invention has the advantages that:
1. improve the work-ing life of bucket tooth, both prevented brittle failure, improved wear resistance again.
2. optimize the chemical ingredients of complex alloy cast-steel, adopted polynary a spot of alloying element, solved the wear resistance of bucket tooth and the contradiction between the high-strong toughness.
3. thermal treatment process is controlled easily, has reduced bucket tooth and has split tendency in heat treated distortion, and microstructure is controlled easily, and structure stability is good, and hardness is at HRC48-55, and its work-ing life, the like product than high mangaenese steel improved 30-40%.
4. excavator uses complex alloy cast-steel bucket tooth of the present invention, has guaranteed to produce normally to carry out, and prevents early stage brittle failure, reduces and shuts down and frequency of maintenance, has improved labour productivity and plant factor, has reduced production cost.
Embodiment
Embodiment 1:
A kind of 4 tons of excavator bucket teeths and production technique thereof
4 tons of multicomponent alloyed cast composition of steel (weight %) that excavator bucket teeth contained are: C0.29, Mn1.45, Si1.52, Cr1.40, Mo0.31, Ti0.07, surplus is Fe.The excavator bucket teeth production technique that is made of complex alloy cast-steel is: 1600 ℃ of its teeming temperatures, sand casting, cast slow cooling to room temperature, then anneal, the annealing heating rate is at 60 ℃/h below 200 ℃, and 100 ℃/h more than 200 ℃ was 880 ℃ of insulations of annealing temperature 3 hours, stove is as cold as 700 ℃ of insulations 4 hours, and then stove is as cold as 400 ℃ by taking out air cooling in the stove.Quench the same annealing process of quenching rate of heating, 870 ℃ of insulations of quenching temperature 4 hours after the machining, bucket tooth is by taking out in the stove, treat coldly after 1 minute in sodium silicate solution (proportion 1.15) and quench, treat that workpiece is as cold as to take out air cooling about 300 ℃ to room temperature, quenching finishes.Carry out tempering then immediately, be heated to 240 ℃ of tempering insulations 3 hours with 60 ℃/h, take out air cooling to room temperature, the hardness of bucket tooth is HRC52.
Embodiment 2:
A kind of 3 tons of excavator bucket teeths and production technique thereof
The multicomponent alloyed cast composition of steel weight % that a kind of 3 tons of excavator bucket teeths contained is: C0.27, Mn1.25, Si1.21, Cr1.10, Mo0.25, Ti0.05, surplusly be Fe.The excavator bucket teeth production technique that is made of complex alloy cast-steel is: 1600 ℃ of complex alloy cast-steel teeming temperatures, sand casting slow cooling are to room temperature, then anneal, rate of heating is at 60-80 ℃/h below 200 ℃, 100-120 ℃/h more than 200 ℃, be heated to annealing, 3 hours stoves of 880 ℃ of insulations of temperature are as cold as 700 ℃ of insulations 3 hours, and then stove is as cold as 400 ℃ by taking out air cooling in the stove.Quench rate of heating when the quenching rate of heating is annealed together after the machining.3 hours middle quenchings of sodium silicate solution (proportion 1.15) of 870 ℃ of insulations of quenching temperature treat that workpiece is as cold as 300 ℃ and takes out air coolings to room temperature, and quenching finishes, and carries out tempering then immediately, are heated to 240 ℃ of insulations taking-up in 3 hours air cooling to room temperature with 60 ℃/h.The hardness HRC51 of bucket tooth.
Embodiment 3:
A kind of 5 tons of excavator bucket teeths and production technique thereof
The multicomponent alloyed cast composition of steel (%) that a kind of 5 tons of excavator bucket teeths contained is: C0.30, Mn1.65, Si1.58, Cr1.65, Mo0.35, Ti0.11, surplusly be Fe.The excavator bucket teeth production technique that is made of complex alloy cast-steel is: 1610 ℃ of complex alloy cast-steel teeming temperatures, sand casting, slow cooling is to room temperature, then anneal, rate of heating is at 50-60 ℃/h below 200 ℃, 90-100 ℃/h more than 200 ℃ is heated to 4 hours stoves of 880 ℃ of insulations and is as cold as 700 ℃ of insulations 5 hours, and then stove is as cold as 400 ℃ by taking out air cooling in the stove.Quench rate of heating when the quenching rate of heating is annealed together after the machining.Quenching temperature is incubated 4 hours by taking out in the stove for 880 ℃, treat coldly and quenched in the bath of glass solution (proportion 1.15) then in 1 minute, treat that workpiece is as cold as 300 ℃ and takes out air cooling to room temperature, quenching finishes, carry out tempering then immediately, be heated to 240 ℃ of insulations with 50 ℃/h and took out air cooling in 4 hours to room temperature.The hardness HRC53 of bucket tooth.
Claims (2)
1, a kind of casting complex alloy cast-steel excavator bucket teeth, it is characterized in that complex alloy cast-steel excavator bucket teeth is such formation, the composition weight % of the complex alloy cast-steel that described excavator bucket teeth contained is: C0.22-0.30, Cr1.1-1.4, Mn1.25-1.65, Si1.21-1.58, Mo0.20-0.31, Ti0.05-0.11, surplus are Fe.
2, a kind of production technique of excavator bucket teeth, it is made up of cast bucket tooth technology and thermal treatment process, it is characterized in that:
Described cast bucket tooth technology, it is with induction furnace or arc melting complex alloy cast-steel, the composition weight % of described complex alloy cast-steel is: C0.22-0.30, Cr1.1-1.4, Mn1.25-1.65, Si1.21-1.58, Mo0.20-0.31, Ti0.05-0.11, surplus are Fe, it adopts vacuum-evaporative pattern casting, resin sand die cast, opening and watering temperature is 1580-1620 ℃, has watered back foundry goods slow cooling to the room temperature demoulding;
Described thermal treatment process is: anneal after bucket tooth has watered, the control rate of heating is being 60-80 ℃/h below 200 ℃, more than 200 ℃ 100-120 ℃/h, 840-900 ℃ of insulation 3-5 hour, stove was as cold as 680-700 ℃ of insulation 4 hours, and stove is as cold as 500 ℃ and takes out air cooling, bucket tooth quenches after machining, workpiece is heated to 840-900 ℃ with 100-120 ℃/h, is incubated 3-5 hour, treats coldly 1-2 minute by taking out in the stove, quench then, heat-eliminating medium is a sodium silicate solution, and its proportion is 1.15, and workpiece is chilled to 300 ℃ and takes out air cooling to room temperature, quenching finishes, carry out tempering then immediately, be heated to 240 ℃, be incubated 3-4 hour and take out air cooling with 40-60 ℃/h.
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| CNB2004100986765A CN1313634C (en) | 2004-12-16 | 2004-12-16 | Complex alloy cast-steel excavator bucket teeth and its producing process |
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| CNB2004100986765A CN1313634C (en) | 2004-12-16 | 2004-12-16 | Complex alloy cast-steel excavator bucket teeth and its producing process |
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| CN1313634C true CN1313634C (en) | 2007-05-02 |
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Cited By (1)
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| CN107267867A (en) * | 2017-07-04 | 2017-10-20 | 合肥择浚电气设备有限公司 | A kind of excavator toothholder manufacturing process for mine |
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| CN102051455B (en) * | 2009-11-04 | 2012-07-04 | 宁波市鄞州商业精密铸造有限公司 | Heat-treatment process for low-temperature abrasion-resistant alloy cast steel |
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