WO2014154104A1 - 一种低合金高韧性耐磨钢板及其制造方法 - Google Patents
一种低合金高韧性耐磨钢板及其制造方法 Download PDFInfo
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- WO2014154104A1 WO2014154104A1 PCT/CN2014/073675 CN2014073675W WO2014154104A1 WO 2014154104 A1 WO2014154104 A1 WO 2014154104A1 CN 2014073675 W CN2014073675 W CN 2014073675W WO 2014154104 A1 WO2014154104 A1 WO 2014154104A1
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- Prior art keywords
- resistant steel
- steel plate
- alloy high
- wear
- low
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 126
- 239000010959 steel Substances 0.000 title claims abstract description 126
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 50
- 239000000956 alloy Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 14
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 50
- 238000001816 cooling Methods 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 26
- 229910001566 austenite Inorganic materials 0.000 claims description 14
- 238000005496 tempering Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 230000000717 retained effect Effects 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 15
- 238000007670 refining Methods 0.000 abstract description 4
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 19
- 238000003466 welding Methods 0.000 description 18
- 229910052799 carbon Inorganic materials 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 239000011651 chromium Substances 0.000 description 13
- 239000010936 titanium Substances 0.000 description 13
- 238000005275 alloying Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005728 strengthening Methods 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000011572 manganese Substances 0.000 description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 8
- 239000011575 calcium Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000010955 niobium Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229910001208 Crucible steel Inorganic materials 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 229910000617 Mangalloy Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0226—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the invention relates to wear-resistant steel, in particular to a low-alloy high-toughness wear-resistant steel plate and a manufacturing method thereof; the typical mechanical properties thereof: tensile strength greater than 1200 MPa, elongation greater than 12%, Brinell hardness greater than 400 HB, -40
- the °C Charpy V-type longitudinal impact energy is greater than 60J.
- Wear-resistant steel plates are widely used in engineering products with high strength and high wear resistance, engineering, mining, agriculture, cement production, ports, electricity and metallurgy. Such as bulldozers, loaders, excavators, dump trucks and grabs, stackers and reclaimers, and feed bending structures.
- Austenitic high manganese steel has been used to produce wear parts. Austenitic high manganese steel can undergo strain-induced martensitic transformation under high impact load and improve its wear resistance. Austenitic high manganese steels are limited by high alloying elements, poor machining, poor weldability, and low initial hardness, and are not suitable for a wide range of applications.
- wear-resistant steel In recent decades, the development and application of wear-resistant steel has developed rapidly. Generally, an appropriate amount of carbon and alloy elements are added, and production is carried out by casting, rolling and offline heat treatment. Producing wear-resistant steel by casting, the production process is short, the process is simple, and easy to produce, but there are disadvantages such as high alloying element content, poor mechanics, welding and mechanical processing performance; wear-resistant steel produced by rolling can be further reduced The content of alloying elements, improve product performance, but still not suitable for wide application; off-line quenching + tempering heat treatment is the most important production mode of wear-resistant steel plate, with less alloying elements, higher product performance, stable industrial production, but With the requirements of low carbon, energy saving and environmental protection, the low cost, short process, low alloy and high toughness products are the inevitable trend of the development of the steel industry.
- Chinese patent CN1140205A discloses a medium-high carbon medium alloy wear-resistant steel which is produced by a casting process and has a high content of carbon and alloying elements (Cr, Mo, etc.), which inevitably leads to poor welding performance and mechanical processing performance.
- Chinese patent CN1865481A discloses a bainite wear-resistant steel, which has high carbon and alloying elements (Si, Mn, Cr, Mo, etc.) and poor weldability; it adopts air-cooling or stack-cooling process after rolling to obtain shellfish. Austenitic wear-resistant steel with low mechanical properties.
- the object of the present invention is to provide a low alloy high toughness wear resistant steel plate and a manufacturing method thereof, the low alloy high toughness wear resistant steel plate has a tensile strength greater than 1200 MPa, an elongation greater than 12%, and a Brinell hardness greater than 400 HB, -40 °C Charpy V-type longitudinal impact energy is greater than 60J, achieving high strength, high hardness and high toughness matching, and has good machinability and welding performance, which is very beneficial to a wide range of applications in engineering.
- a low alloy high toughness wear resistant steel plate having a chemical composition weight percentage of C: 0.08-0.20%, Si: 0.10-0.60%, Mn: 1.00-2.00%, B: 0.0005-0.0040%, Cr ⁇ 1.50%, Mo ⁇ 0.80%, Ni ⁇ 1.50%, Nb ⁇ 0.080%, V ⁇ 0.080%, Ti ⁇ 0.060%, Al: 0.010-0.080%, Ca: 0.0010-0.0080%, N ⁇ 0.0080%, O ⁇ 0.0080%, H ⁇ 0.0004%, P ⁇ 0.015%, S ⁇ 0.010%, and satisfying 0 ⁇ 20% ⁇ (Cr/5+Mn/6+50B) ⁇ 0.55%, 0.02% ⁇ (Mo/3+Ni/5+2Nb) ⁇ 0.45%, 0.01% ⁇ ( Al+Ti ) ⁇ 0.13%, the rest are Fe and unavoidable impurities; the microstructure is fine martensite and retained austenite, wherein the volume fraction of retained austenite ⁇ 5%; Typical mechanical properties: Its tensile strength is greater than 1200MP
- the chemical composition of the low alloy high toughness wear resistant steel sheet according to the present invention is as follows:
- Carbon is the most basic and important element in wear-resistant steel. It can improve the strength and hardness of steel and improve the wear resistance of steel. However, it is unfavorable to the toughness and weldability of steel. Therefore, it should be controlled in steel.
- the carbon content is from 0.08 to 0.20 wt.%, preferably from 0.10 to 0.20 wt.%.
- Silicon solid solution increases their hardness and strength in ferrite and austenite.
- too high a silicon content leads to a sharp drop in the toughness of steel.
- the affinity of silicon and oxygen is stronger than that of iron, it is easy to produce low-melting silicate during welding, increasing the fluidity of molten slag and molten metal, affecting the quality of the weld, so the content is not easy to be excessive, and the low alloy of the present invention is high.
- the control silicon in the ductile wear-resistant steel is from 0.10 to 0.60 wt.%, preferably from 0.10 to 0.50 wt.%.
- Manganese strongly increases the hardenability of steel and reduces the transition temperature of wear-resistant steel and the critical cooling rate of steel. However, when the manganese content is high, there is a tendency to coarsen the crystal grains, and the tempering and brittle sensitivity of the steel is increased, and segregation and cracking in the cast slab are easily caused, and the performance of the steel sheet is lowered, and the low alloy high toughness resistance of the present invention is resistant.
- the controlled manganese content in the milled steel is 1.00-2.00 wt.%, preferably 1.00-1.80 wt.%schreib
- the boron content of the low alloy high toughness wear resistant steel of the present invention is controlled. It is 0.0005 to 0.0040 wt.%, preferably 0.0005 to 0.0020 wt.%.
- Chromium can reduce the critical cooling rate and improve the hardenability of steel. Chromium can form various carbides such as (Fe, Cr) 3 C, (Fe, Cr) 7 C 3 and (Fe, Cr) 23 C 7 in steel to improve strength and hardness. Chromium can block or temper Slowing the precipitation and aggregation of carbides can improve the tempering stability of the steel.
- the low-alloy high-toughness wear-resistant steel of the present invention has a controlled chromium content of ⁇ 1.50 wt.%, preferably 0.10-1.20 wt.%.
- Molybdenum can refine grains and improve strength and toughness. Molybdenum exists in the solid solution phase and the carbide phase in steel. Therefore, the molybdenum-containing steel has both solid solution strengthening and carbide dispersion strengthening. Molybdenum is an element that reduces temper brittleness and improves tempering stability.
- the low-alloy high-toughness wear-resistant steel of the present invention has a controlled molybdenum content of ⁇ 0.80 wt.%, preferably ⁇ 0.60 wt.%.
- Nickel has the effect of significantly reducing the cold-brittle transition temperature. However, if the content is too high, the scale of the steel sheet is difficult to fall off, and the cost is significantly increased.
- the low-alloy high-toughness wear-resistant steel of the present invention has a controlled nickel content of ⁇ 1.50 wt.%. , preferably ⁇ 1.20 wt.%.
- the grain refinement and precipitation strengthening of b are extremely significant for improving the toughness and toughness of the material, and are strong elements of C and N formation, which strongly inhibit the growth of austenite grains.
- Nb Through grain refinement while improving the strength and toughness of steel, Nb mainly improves and improves the properties of steel through precipitation strengthening and phase transformation strengthening. Nb has been used as one of the most effective strengthening agents in HSLA steel, and the invention is low.
- the controlled niobium content in the alloy high toughness wear resistant steel is ⁇ 0.080 wt.%, preferably 0.005-0.080 wt.%.
- Vanadium The addition of vanadium is mainly to refine the grains, so that the austenite grains in the heating stage are not too coarse in the heating stage, so that the grain of the steel can be obtained in the subsequent multi-pass rolling process. Further refining, to increase the strength and toughness of the steel, the low-alloy high-toughness wear-resistant steel of the present invention has a controlled vanadium content of ⁇ 0.080 wt.%, preferably ⁇ 0.060 wt.%.
- Titanium is one of the strong carbide forming elements and forms fine TiC particles with carbon.
- the TiC particles are fine and distributed at the grain boundary to achieve the effect of refining the grains.
- the hard TiC particles improve the wear resistance of the steel.
- the low-alloy high-toughness wear-resistant steel of the present invention has a controlled titanium content of ⁇ 0.060 wt.%. It is preferably 0.005 to 0.060 wt.%.
- Nitrogen in aluminum and steel forms fine, insoluble A1N particles that refine the grain of steel.
- Aluminum can refine the grain of steel, fix nitrogen and oxygen in steel, reduce the sensitivity of steel to the notch, reduce or eliminate the aging of steel, and improve the toughness of steel.
- the low alloy high toughness wear-resistant steel of the invention The medium aluminum content is controlled to be 0.010-0.080 wt.%, preferably 0.020-0.080 wt.%.
- Titanium can form fine particles and refine grains. Aluminum can ensure the formation of fine titanium particles and fully exert the grain refinement effect of titanium. Therefore, the contents of aluminum and titanium are as follows: 0.010% ⁇ A1+Ti ⁇ 0.13%, preferably 0.010% ⁇ A1 + Ti ⁇ 0.12%.
- the low alloy high performance wear resistant steel of the present invention has a controlled calcium content of from 0.0010 to 0.0080 wt.%, preferably from 0.0010 to 0.0050 wt.%.
- Phosphorus and sulfur In wear-resistant steel, sulfur and phosphorus are harmful elements, and their content should be strictly controlled.
- the controlled phosphorus content in the steels involved in the invention is ⁇ 0.015wt.%, preferably ⁇ 0.012wt.%;
- the sulfur content is ⁇ 0.010 wt.%, preferably ⁇ 0.005 wt.%.
- Nitrogen, oxygen, hydrogen Excessive oxygen, nitrogen and hydrogen in steel are very detrimental to the properties of steel, especially weldability, impact toughness and crack resistance, reducing the quality and service life of steel plates, but the control is too strict.
- the controlled nitrogen content in the steel of the invention is ⁇ 0.0080 wt.%, preferably ⁇ 0.0050 wt.%; the control oxygen content ⁇ 0.0080 wt.%, preferably ⁇ 0.0050 wt.%; controlling the hydrogen content ⁇ 0.0004 wt.%, preferably ⁇ 0.0003 wt.%.
- each of the smelting raw materials is subjected to a direct cooling step of smelting, casting, heating, rolling, and rolling in accordance with the ratio of the above chemical components to obtain the low alloy high toughness resistance.
- Grinding steel plate wherein, in the heating step, the slab heating temperature is 1000-1200 ° C, and the heat preservation is 1-3 hours; in the rolling step, the rough rolling temperature is 900-1150 ° C, and the finishing rolling temperature is 780-880 °C;
- the cooling step it is cooled by water to 400 °C and then air cooled to room temperature, wherein the water cooling rate is ⁇ 20 °C / s.
- a tempering step is further included.
- the heating temperature is 100-400 ° C and the temperature is kept for 30-120 min.
- the heating temperature is 1000-1150 ° C; the more preferable heating temperature is 1000-1130 ° C; in order to improve production efficiency and prevent excessive growth of austenite grains and severe oxidation of the surface of the steel slab
- the most preferred heating temperature is 1000-1110 °C.
- the rough rolling temperature is 900-1100 ° C, the rolling reduction ratio in the rough rolling stage is greater than 20%, the finishing rolling temperature is 780-860 ° C, and the rolling reduction ratio in the finishing rolling stage is greater than 40%; more preferably, the rough rolling temperature is 900-1080 ° C, the rolling reduction rate in the rough rolling stage is more than 25%, the finishing rolling temperature is 780-855 ° C, and the rolling reduction rate in the finishing rolling stage is more than 45%. Most preferably, the rough rolling temperature is 910-1080 ° C, the rolling reduction rate in the rough rolling stage is greater than 28%, the finishing rolling temperature is 785-855 ° C, and the rolling reduction ratio in the finishing rolling stage is greater than 50%;
- the cooling temperature is below 380 ° C, the water cooling cooling rate is ⁇ 23 ° C / s; more preferably, the cooling temperature is below 350 ° C, the water cooling cooling rate is ⁇ 27 ° C / s; Most preferably, the cooling temperature is below 330 ° C, and the water cooling cooling rate is ⁇ 30 ° C / s.
- the heating temperature is 100-380 ° C, and the temperature is kept for 30-100 min; more preferably, The heating temperature is 120-380 ° C, and the temperature is 30-100 min; most preferably, the heating temperature is 150-380 ° C, and the temperature is 30-100 min.
- the obtained wear-resistant steel plate is obtained by refining and strengthening the alloying elements and controlling the refinement and strengthening effect of the rolling and cooling processes.
- Excellent mechanical properties such as strength, hardness, elongation, impact properties, etc.), weldability and wear resistance.
- the alloy composition of the low-alloy high-toughness wear-resistant steel plate of the present invention is mainly low-carbon low-alloy, and fully utilizes the characteristics of refinement and strengthening of microalloying elements such as Nb and Ti to reduce carbon and At the same time as the alloying elements such as Cr, Mo and M, the wear-resistant steel sheet has good mechanical properties and excellent welding properties.
- the low-alloy high-toughness wear-resistant steel plate of the invention is produced by TMCP process, and the structure refinement is improved by controlling the process parameters such as opening and ending rolling temperature, rolling deformation and cooling speed in the TMCP process.
- the process has the characteristics of short production process, high efficiency, energy saving and low cost.
- the low-alloy high-toughness wear-resistant steel plate of the invention has high strength, high hardness, high low temperature toughness (typical mechanical properties: tensile strength greater than 1200 MPa, elongation greater than 12%, Brinell hardness greater than 400 HB , -40 °C Charpy V-type longitudinal impact energy is greater than 60J), and has good weldability ⁇ fi ⁇
- the low-alloy high-toughness wear-resistant steel plate of the invention fully utilizes alloying element addition and controlled rolling and controlled cooling to obtain fine martensite structure and retained austenite (including residual austenite volume)
- the score ⁇ 5%) is good for the good matching of the strength, hardness and toughness of the wear-resistant steel.
- the wear-resistant steel plate of the invention has obvious advantages, the control of the carbon and alloying element content and the wear-resistant steel plate obtained by each heat treatment process have low cost, high process cylinder, high hardness, good low temperature toughness and excellent mechanical processing performance. Easy to weld, suitable for wearable parts in various mechanical equipment. This type of wear-resistant steel plate is an inevitable trend in the development of social economy and steel industry.
- FIG. 1 is a photograph showing the microstructure of a steel sheet according to Example 5 detailed description
- the wear-resistant steel sheets of the following Examples 1-10 and the steel sheets of Comparative Example 1 have the chemical composition percentages as shown in Table 1; the wear-resistant steel sheets of Examples 1-10 and Comparative Example 1 (Comparative Example 1 is the patent CN1865481A)
- the manufacturing method of the steel sheet of the embodiment) is as follows: The corresponding smelting raw materials are sequentially subjected to the following steps: smelting ⁇ casting ⁇ heating ⁇ rolling ⁇ direct cooling after rolling ⁇ tempering (no tempering), controlling various examples and comparative examples 1 in the steel sheet chemical element mass ratio, wherein, in the heating step, the slab heating temperature is 1000-1200 ° C, holding 1-3 hours; in the rolling step, the rough rolling temperature is 900-1150 ° C The finishing temperature is 780-880 °C; in the cooling step, it is cooled by water to 400 °C and then air cooled to room temperature, wherein the water cooling cooling rate is >20 °C / s; in the tempering step, the heating temperature is
- the abrasion resistance test was carried out on an ML-100 abrasive wear tester.
- the axis of the sample is perpendicular to the surface of the steel sheet, and the worn surface of the sample is the rolled surface of the steel sheet.
- the sample is processed into a stepped cylinder as required.
- the size of the test part is (D4mm, the size of the clamping part of the fixture is (D5mm.
- the sample is cleaned with alcohol before the test, and then blown dry with a hair dryer, at a precision of one ten thousandth.
- the balance is weighed, the weight of the sample is measured as the original weight, and then mounted on the elastic fixture.
- the sandpaper with a particle size of 80 mesh is tested under the load of 84 N.
- rl is the starting radius of the helix
- r2 is the ending radius of the helix
- a is the feed of the helix.
- the welding constrained weld is welded, and the restrained weld is welded with Ar gas-enhanced welding.
- the JM-58 welding wire of ⁇ 1.2 is used, and the angular deformation of the test piece is strictly controlled during the welding process.
- the weld of the test weld was carried out after cooling the room temperature after welding.
- the test weld is welded at room temperature.
- the weld surface crack and section are detected. Cracks and root cracks.
- the welding specification is 170Ax25Vx l60mm/min.
- Example 5 50 °C 3 0 0 0 26 °C 66%
- Example 8 50 °C 3 0 0 0 33 °C 61%
- Example 9 750 °C 3 0 0 0 28 °C 59%
- the wear-resistant steel plate of Example 5 was examined to obtain a microstructure thereof. As shown in FIG. 1, the microstructure was fine martensite and a small amount of retained austenite, wherein the retained austenite volume fraction was ⁇ 5%. This ensures that the steel sheet has excellent mechanical properties.
- the invention scientifically designs carbon and alloy composition and ratio thereof under reasonable production process conditions, and reduces Alloy cost, making full use of microalloying elements and TMCP process for microstructure refinement and strengthening, the obtained wear-resistant steel plate has excellent mechanical properties (such as high hardness, strength, elongation, impact toughness, etc.) and welding properties.
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JP2015554048A JP6251291B2 (ja) | 2013-03-28 | 2014-03-19 | 高靱性の低合金耐摩耗鋼板およびその製造方法 |
NZ708752A NZ708752A (en) | 2013-03-28 | 2014-03-19 | High-toughness low-alloy wear-resistant steel sheet and method of manufacturing the same |
KR1020177016489A KR102040680B1 (ko) | 2013-03-28 | 2014-03-19 | 고인성 저합금 내마모성 강판 및 이의 제조 방법 |
AU2014243611A AU2014243611B2 (en) | 2013-03-28 | 2014-03-19 | High-toughness, low-alloy, wear-resistant steel sheet and method of manufacturing the same |
EP14774698.6A EP2980255A4 (en) | 2013-03-28 | 2014-03-19 | LOW-ALLOY STEEL PLATE OF HIGH TOUGHNESS AND WEAR-RESISTANT AND METHOD FOR MANUFACTURING THE SAME |
US14/762,596 US10494706B2 (en) | 2013-03-28 | 2014-03-19 | High-toughness low alloy wear-resistant steel sheet and method of manufacturing method thereof the same |
ZA2015/04328A ZA201504328B (en) | 2013-03-28 | 2015-06-15 | Low alloy high toughness wear-resistant steel plate and manufacturing method thereof |
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CN115125443A (zh) * | 2022-06-17 | 2022-09-30 | 武汉钢铁有限公司 | 一种高韧性易焊接钢及其制备方法 |
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KR20150086552A (ko) | 2015-07-28 |
CN103146997B (zh) | 2015-08-26 |
KR20170073716A (ko) | 2017-06-28 |
EP2980255A4 (en) | 2016-11-23 |
NZ708752A (en) | 2016-11-25 |
US10494706B2 (en) | 2019-12-03 |
AU2014243611A1 (en) | 2015-07-23 |
AU2014243611B2 (en) | 2016-07-28 |
JP2016509630A (ja) | 2016-03-31 |
US20160002759A1 (en) | 2016-01-07 |
ZA201504328B (en) | 2016-04-28 |
EP2980255A1 (en) | 2016-02-03 |
JP6251291B2 (ja) | 2017-12-20 |
CN103146997A (zh) | 2013-06-12 |
KR102040680B1 (ko) | 2019-11-05 |
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