CN100540711C - Ultra-high performance wearable high-manganese steel and production method thereof - Google Patents
Ultra-high performance wearable high-manganese steel and production method thereof Download PDFInfo
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Abstract
The invention provides a kind of ultra-high performance wearable high-manganese steel and production method thereof.Its chemical ingredients is C:1.00%～1.50%, Mn:10.5%～20.0%, Si:0.30%～0.80%, Cr:1.3%～2.8%, S≤0.040%, P≤0.070%, Ti:0.06%～0.20%, V:0.10%～0.40%, B:0.002%～0.010, Mg:0.06%～0.3%, RE:0.08%～0.4%, N:0.05%～0.2%, and surplus is an iron.Production method: when liquid steel temperature reaches 1500～1550 ℃, reduce and added nitrogen and calcium in back 5 minutes, the preceding 10 minutes slotting aluminium of tapping adds 2～5kg/t vanadium and 4～10kg/t titanium, tap and added 2～6kg/t rare earth magnesium in the jar at 1/3 o'clock, tap and added 1～4kg/t rare earth silicon in the jar at 1/2 o'clock, tapping added 0.1～0.3kg/t boron in the jar at 2/3 o'clock, and the teeming temperature of molten steel is controlled at 1430～1460 ℃.The present invention adopts new alloying technology process, has improved the wear resisting property and the comprehensive mechanical performance of high mangaenese steel.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to casting industry wearing piece steel and production method thereof.
Background technology
At present, the antiwear high manganese steel that people are known is to add some alloying elements commonly used to improve its wear resisting property on the basis of existing common high mangaenese steel, to improve the work-ing life of high manganese steel wear resistant part mostly.But its result often: the hardness of some wearing piece has improved, but toughness is but very low, easily splits, and can't guarantee its work-ing life; Some wearing piece toughness has improved, but hardness is but very low, easy to wear, also can't guarantee its work-ing life.In a word, its comprehensive mechanical performance changes little, and wear resisting property and work-ing life are not high.
Summary of the invention
The object of the present invention is to provide a kind of can overcome existing wearability of wearable high manganese steel can be low, improve the ultra-high performance wearable high-manganese steel and the production method thereof of its comprehensive mechanical performance.
The chemical ingredients of ultra-high performance wearable high-manganese steel of the present invention is (by weight percentage) C:1.00%～1.50% (being preferably 1.2%～1.25%), Mn:10.5%～20.0% (being preferably 11%～14%), Si:0.30%～0.80% (being preferably 0.40%～0.60%), Cr:1.3%～2.8% (being preferably 1.5%～2.0%), S≤0.040%, P≤0.070%, Ti:0.06%～0.20% (being preferably 0.08%～0.12%), V:0.10%～0.40% (being preferably 0.15%～0.25%), B:0.002%～0.010 (is preferably 0.003%～0.006%, best 0.005%), Mg:0.06%～0.3% (being preferably 0.08%～0.15%), RE:0.08%～0.4% (being preferably 0.1%～0.15%), N:0.05%～0.2% (being preferably 0.08%～0.1%), surplus is an iron.
The production method of ultra-high performance wearable high-manganese steel of the present invention comprises smelting process, be characterized in: when liquid steel temperature reaches 1500～1550 ℃, reduce and added nitrogen and calcium in back 5 minutes, the preceding 10 minutes slotting aluminium 0.6～1kg/t that tap add vanadium and titanium, add-on is respectively 2～5kg/t and 4～10kg/t, tap and in jar, added 2～6kg/t rare earth magnesium at 1/3 o'clock, tap and in jar, added rare earth silicon 1～4kg/t at 1/2 o'clock, tapping added 0.1～0.3kg/t boron at 2/3 o'clock in jar, the teeming temperature of molten steel is controlled at 1430～1460 ℃.
The present invention has adopted new alloying technology process, has improved the wear resisting property and the comprehensive mechanical performance of common high mangaenese steel greatly, and production technique is simple, easy to operate, and production cost is low, and the economic benefit height is easy to utilize.
The composition of steel grade of the present invention and technological design reason:
Carbon: be used for obtaining superstrength and hardness.Carbon decision wear resistance height in the high mangaenese steel, when carbon 1.5%, sample after 550 hours, weares and teares 0.3% at impact friction; When carbon 1.0%, sample after 550 hours, weares and teares 0.7% at impact friction; When carbon 1.2%～1.3%, sample is at impact friction after 550 hours, wearing and tearing 0.4%～0.5%; Wall thickness 〉=100 o'clock, toughness descends serious, easily cracks, and the carbon of every increase by 0.1% will reduce ak value: 40J/cm
2So the carbon of wearing piece is controlled at 1.2%～1.25% the best, i.e. comprehensive mechanical performance the highest (as cast condition ak value is near 0 during carbon 1.3%).Carbide is separated out 960 ℃ of temperature, but the tough processing of water back carbon 1.3%, ak value 〉=120J/cm
2The carbon amount increases the expansion crystallization interval, makes crystal structure thick, makes the carbide of separating out in the austenite also thick and concentrated.Should improve the tough treatment temp of water when carbon is high or prolong soaking time and come full and uniform ground solid solution carbide dissolving carbide.
Manganese: manganese is the principal element of stable austenite, also is to strengthen the hardening capacity element, and the F body is had strengthening effect.Manganese content 11% increases at 14% o'clock in the high mangaenese steel, and the yield strength of steel is not affected, and can strengthen tensile strength and extensibility gradually.When manganese increases to 15%, no longer significantly improve mechanical property, can cause that on the contrary the shrinkage of steel increases, easily produce shrinkage cavity and crackle.(Mn/C)＞10 produce perlitic transformation in the time of can avoiding cooling off, guarantee austenite toughness.(Mn/C)＜10 o'clock can improve wear resistance.Therefore manganese carbon ratio=10 can be improved and obtained comprehensive mechanical performance preferably.C%=1.25～2.5 (P) % carbon drop amount prevents to ftracture.
Silicon: in low-alloy super-strength steel, demonstrate outstanding important effect, not only obtain eutectoid ε-carbide precipitation after silicon improves tempering temperature and strengthen, and because stress relieving, to toughness, anti-H is crisp and performances such as stress corrosion crack, fatigue are highly beneficial.But silicon has been separated out promoter action to carbide, and helps eutectoid transformation.It is thick that silicon＞0.8% o'clock will make carbide begin, and silicon＞2.2% carbide is thick and excessive separating out sharply, and crystal grain is thick during solution treatment, causes toughness to reduce silicon 0.5% the best.
Phosphorus: the deleterious effect of phosphorus mainly is to worsen mechanical property, abrasion resistance and the casting technique performance of high mangaenese steel.Phosphorus solubleness in austenite is very little, and 1005 ℃ form Fe+Fe
3P binary iron phosphide eutectic; 950 ℃ form Fe+Fe
3C+Fe
3P ternary iron phosphide eutectic.Iron phosphide eutectic descends high mangaenese steel performance (intensity, plasticity, toughness).Phosphorus surpasses 0.04% plastic tensile strength and sharply descends, and is low more good more.
Sulphur: high temperature is easily crisp, and span of control≤0.030 is low more good more.
Chromium: mainly improve hardening capacity, improve hardness slightly, improve the austenite yield strength, improve wear resistance to anticorrosive useful but reduce toughness.But it easily generates inclusion, makes the molten steel retrogradation, reduces flowability, increases the body shrinkage, increases shrinkage cavity tendency, reduces thermal conductivity.Chromium 〉=1.5% begins to reduce toughness, and 1.5%～2.0% comprehensive mechanical performance is the highest.
Al: deoxidizing capacity is strong, thinning microstructure.But too high levels forms embrittlement of grain boundaries and hot tearing reduces toughness, phosphorus content＜0.07%, aluminium add-on 0.08%; Residual quantity 0.035%～0.045% in the steel.Aluminium add-on Al＞0.15% can make the thick wear resistance of crystal grain reduce.But aluminium add-on Al＜0.15% deoxidation is good, is beneficial in the steel to improve crack resistance and impelling strength, should add in jar.
Nitrogen: in high mangaenese steel, can form nitride, as wear-resisting hard points such as TiN, VN.Its content is better in 0.08%～0.1% range effect.
Vanadium: improve hardening capacity, dissolving in the F body has strengthening effect, forms stable carbide, crystal grain thinning, and special the combination with titanium can be improved work hardening ability and wear resistance.It is better that its content is controlled at 0.15%～0.25% effect.
Titanium: be strong carbide forming element, crystal grain thinning can be eliminated column crystal, form hard point (TiC, TiN), improve wear resistance, the titanium add-on can obviously improve wear resistance at 0.08%～0.12% o'clock than not titaniferous steel, but at 0.4% o'clock obvious embrittlement reduction wear resistance.
Rare earth: main effect is: 1) cleaning molten steel (with [S], [O], [H], [N]), improve the metallurgical quality (reducing in the steel [MO]) of high mangaenese steel; 2) improve primary crystallization (obstruction grain growth), carbide forming element is optimized the high mangaenese steel tissue; 3) improving the high mangaenese steel castability (reduces carbide and separates out, improve plasticity, reduce casting stress; 4) mechanical property of raising high mangaenese steel (improve hardness, improve yield strength and impelling strength); 5) promote work hardening, improve the high mangaenese steel wear resistance.Its content is preferably 0.3%～0.5%.
Magnesium: magnesium is a kind of nucleating agent, can reduce the super cooling tendency of molten steel, but crystal grain thinning makes carbide group waddingization, thereby, the toughness and the wear resistance of raising steel.Be preferably 0.8%～0.15%.
Boron: be surface active element, mainly have the lattice defect place, be enriched in the austenite grain boundary place.But the boron crystal grain thinning adds 0.003%～0.006% and can eliminate column crystal in the steel, the density that it can improve steel plays strengthening effect to crystal boundary, but consumption too much can reduce the intensity and the plasticity of steel.
Calcium: it is a kind of nucleating agent, can reduce the super cooling tendency of molten steel, but crystal grain thinning makes carbide group waddingization, thereby, the toughness and the wear resistance of raising steel.It is again a kind of intensive reductor, but desulfurization, but purify hot metal.Its add-on 0.2%～0.6% for well.
Embodiment
Embodiment 1
The embodiment of the invention 1 is example to produce the ultra-high performance wearable high-manganese steel ball grinding machine lining board with steel (10 tons of molten steel), the chemical ingredients of this steel grade is (weight percent) C:1.23%, Mn:12.65%, Si:0.56%, Cr:1.58%, S:0.018%, P:0.043%, Ti:0.11%, V:0.14%, B:0.005%, Mg:0.09%, RE:0.15%, N:0.09%, and surplus is an iron.
The production method of this steel grade comprises, adopts the element proportioning and the distinctive alloying technology of the present invention of conventional steel grade.When liquid steel temperature reaches 1500～1550 ℃, reduce to add 200kg nitrogenize ferromanganese and 40kg silico-calcium in back 5 minutes; Preceding 10 minutes slotting aluminium 0.6～1kg/t add vanadium iron 30kg (containing vanadium 50%, recovery rate 95%) in tapping, add ferrotianium 70kg (titaniferous 30% recovery rate 50%); In jar, add rare earth magnesium 30kg (contain rare earth 32%, recovery rate 90%～95% contains magnesium 30%, recovery rate 90%～95%) during tapping to 1/3, add rare earth silicon 20kg (containing rare earth 36%, recovery rate 90%～95%); In jar, add 2kg ferro-boron (boracic 20%, recovery rate 90%) during tapping to 2/3; Teeming temperature is controlled at 1430～1460 ℃.
The mechanical property of this embodiment steel grade is as follows:
Hardness HB: as cast condition: the tough attitude of 205 quench water: 241 tempering attitudes: 229;
Impelling strength Ak/J: tempering attitude: 205J;
Grain fineness number: 5～6 grades (1 grade of former ball grinding machine lining board grain fineness number);
Carbide: X3 level.
Through test, adopt brought up to 5000 hours the work-ing life of the ball grinding machine lining board of steel grade production of the present invention by about 2000 hours of original all-time high, improved 150% its work-ing life.
Embodiment 2
The embodiment of the invention 2 is example to produce the ultra-high performance wearable high-manganese steel lining plate of cone crusher with steel (10 tons of molten steel), the chemical ingredients of this steel grade is (weight percent) C:1.20%, Mn:12.95%, Si:0.51%, Cr:1.68%, S:0.019%, P:0.045%, Ti:0.12%, V:0.17%, B:0.0045%, Mg:0.085%, RE:0.14%, N:0.08%, and surplus is an iron.
The production method of this steel grade comprises, adopts the element proportioning and the distinctive alloying technology of the present invention of conventional steel grade.When liquid steel temperature reaches 1500～1550 ℃, reduce to add 200kg nitrogenize ferromanganese and 40kg silico-calcium in back 5 minutes; Preceding 10 minutes slotting aluminium 0.6～1kg/t add vanadium iron 30kg (containing vanadium 50%, recovery rate 95%) in tapping, add ferrotianium 75kg (titaniferous 30% recovery rate 50%); In jar, add rare earth magnesium 30kg (contain rare earth 32%, recovery rate 90%～95% contains magnesium 30%, recovery rate 90%～95%) during tapping to 1/3, add rare earth silicon 20kg (containing rare earth 36%, recovery rate 90%～95%); In jar, add 2kg ferro-boron (boracic 20%, recovery rate 90%) during tapping to 2/3; Teeming temperature is controlled at 1430～1460 ℃.
The mechanical property of this embodiment steel grade is as follows:
Hardness HB: as cast condition: the tough attitude of 195 quench water: 231 tempering attitudes: 225;
Impelling strength Ak/J: tempering attitude: 201J;
Grain fineness number: 7～8 grades (1 grade of former crusher liner plate grain fineness number);
Carbide: X2 level.
Through test, adopt surpassed the tidemark of original external original-pack crusher liner plate about 530 hours the work-ing life of the crusher liner plate of steel grade production of the present invention, reach 590 hours.
Claims (4)
1. ultra-high performance wearable high-manganese steel, the chemical ingredients that it is characterized in that molten steel is (by weight percentage) C:1.00%～1.50%, Mn:10.5%～20.0%, Si:0.30%～0.80%, Cr:1.3%～2.8%, S≤0.040%, P≤0.070%, Ti:0.06%～0.20%, V:0.10%～0.40%, B:0.002%～0.010, Mg:0.06%～0.3%, RE:0.08%～0.4%, N:0.05%～0.2%, and surplus is an iron.
2. ultra-high performance wearable high-manganese steel according to claim 1, it is characterized in that C:1.2%～1.25%, Mn:11%～14%, Si:0.40%～0.60%, Cr:1.5%～2.0%, Ti:0.08%～0.12%, V:0.15%～0.25%, B:0.003%～0.006%, Mg:0.08%～0.15%, RE:0.1%～0.15%, N:0.08%～0.1% in the described molten steel, more than all be weight percentage.
3. ultra-high performance wearable high-manganese steel according to claim 2 is characterized in that Si:0.5%, B:0.005% in the described molten steel, more than all be weight percentage.
4. the production method of a claim 1,2 or 3 described ultra-high performance wearable high-manganese steels, comprise smelting process, it is characterized in that reaching 1500～1550 ℃ when liquid steel temperature, reduce and added nitrogen and calcium in back 5 minutes, the preceding 10 minutes slotting aluminium 0.6～1kg/t that tap add vanadium and titanium, add-on is respectively 2～5kg/t and 4～10kg/t, tap and in jar, added 2～6kg/t rare earth magnesium at 1/3 o'clock, tap and in jar, added rare earth silicon 1～4kg/t at 1/2 o'clock, tapping added 0.1～0.3kg/t boron at 2/3 o'clock in jar, the teeming temperature of molten steel is 1430～1460 ℃.
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| CN105886911B (en) * | 2016-04-21 | 2018-02-13 | 西北矿冶研究院 | Preparation method of high-strength high-toughness wear-resistant lining plate of semi-autogenous mill |
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| CN114318131B (en) * | 2021-03-22 | 2023-01-20 | 武汉钜能科技有限责任公司 | Wear-resistant alloy |
| CN116083813A (en) * | 2023-01-05 | 2023-05-09 | 鞍钢集团矿业有限公司 | N microalloyed high manganese steel and heat treatment method and application thereof |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |