CN100420765C - Steel for circular ring chains for mineral purpose - Google Patents
Steel for circular ring chains for mineral purpose Download PDFInfo
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Abstract
The present invention relates to steel used for circular ring chains for mineral purpose, particular to manganese-containing alloy steel which contains the following chemical components by mass percentage: 0.17 to 0.30% of C, 1.2 to 2.0% of Mn, 0.1 to 0.8% of Si, 0.1 to 0.5% of Mo, 0.1 to 0.8% of Cr, 0.03 to 0.15% of V and/or Nb, 0.02 to 0.05% of Al, at most 0.03% of S, at most 0.03% of P, at most 0.2% of Cu and Fe as the rest. Electric furnace steelmaking or converter steelmaking, LF refining, small billet casting and hot rolling are adopted as a process route to produce the steel used for circular ring chains for mineral purpose in the present invention, wherein the electric furnace and the converter are generally constructed by steelmaking enterprises of China; roll annealing needs not be adopted, the structure and the quality of the steel are under stable control, the production process is simplified, and the production cost of the steel is decreased obviously. The steel of the present invention has favorable processing performance of producing circular ring chains and superior hardenability, and thus, the steel can be used for producing circular ring chains whose diameter is longer than 18mm. The steel of the present invention has outstanding technical and economic rationality.
Description
Technical field
Technical scheme of the present invention relates to a kind of manganiferous steel alloy.
Technical background
High strength mining round link chain is the important integral part of coal winning machinery and Transport Machinery, belongs to easily worn part, and consumption is big.Press national Specification, be divided into B, C and three ranks of D by the mechanical property requirements round-link chain, C level round-link chain usage quantity is bigger at present, extensively adopts 25MnV and 23MnCrNiMo54 steel alloy to make.But 25MnV only is fit to make C level round-link chain (medium frequency induction hardening of 25MnV steel high strength mining round link chain, metal heat treatmet, 11,2004 of small dimension (≤φ 18mm); Talk the cognition of mining high strength C level round-link chain manufacturing, Central Region coal, 5,1997) with steel.Adopt 23SiMnV to carry out the manufacturing of C level round-link chain, though report (influence of the 20SiMnV steel obdurability that Si uses circle chain of mine, mechanical engineering material, 4,1986 are arranged; The 23SiMnV steel that is used for the mine high-tensile round-link chain, mechanical engineering material, 3,1985), but seldom adopt in the actual production, its specification also is limited in below the φ 18mm.There is bibliographical information the ring chain steel 25SiMnMoV that recommends in the circle chain of mine national standard to be used for the manufacturing (research of 25SiMnMoV steel high strength mining round link chain performance of D level round-link chain, metal heat treatmet, 10,1988), but specification also is limited to φ 18mm, and in actual production because of its Si content up to 0.8%～1.1%, influence the flash welding performance of steel, be not applied." special steel " 1986 the 5th phases had once been reported 24SiMnNiMo round-link chain new steel grade, but were used for the production of D level round-link chain, and specification is limited to below the 18mm diameter, needs to carry out anneal after rolling.In actual production, the C level round-link chain of big format diameter 〉=φ 22mm extensively adopts the 23MnCrNiMo54 steel, and this steel grade is the external trade mark, the cost of alloy height, and complex manufacturing relies on external import, though the quality height, price is extremely expensive.Have in recent years that bibliographical information is domestic to have carried out producing (average tempering of coal machine circular chain steel changes, metal heat treatmet, 10,2001) to this trade mark steel.Because of reasons such as its complex manufacturing, often there is the inner quality problem of inhomogeneity of structure, discordance in homemade 23MnCrNiMo54 steel, and its quality can't reach foreign level, has reduced the production efficiency of round-link chain, and this price of steel product is also than higher.Therefore domestic also do not have suitable steel grade at present in order to produce big specification C level round-link chain.CN 85103476 disclosed D level ring chain steels, this invention is characterised in that it consists of: weight percent (%) C, Si, Mn, NiO.21～0.27,0.65～0.95,1.10～1.40,0.80～1.10 Mo, Al, SP, Cr, Cu 0.10～0.20,0.02～0.05 ,≤0.035≤0.35≤0.25, wherein contain more noble element Ni, must annealing after rolling could satisfy the requirement of shearing blanking, thereby steel production cost height, only be used for the manufacturing of D level round-link chain.The composition of the steel alloy of SU1404549 report is C 0.05-0.14, Mn2.0-2.5, Cr 2.0-2.6, Si 0.15-0.4, Ni 0.2-0.4, Mo 0.20-0.30, and add Al, N and carry out microalloying, its alloying element content height, the production cost height, carbon content is lower, thereby wear resistance is bad.CN 00109053.4 discloses high strength, high tenacity, corrosion resistant mooring chain steel and production technique thereof, this steel contains (weight %) C:0.25%-0,33%, Si:0.15%-0.30%, Mn:1.45%-1.75%, Cr:0.90%-1.40%, Ni:1.00%-1.20%, Mo:0.45%-0.65%, Nb:0.02%-0.06%, Al:0.020%-0.05%, remnants and harmful element P :≤0.020%, S :≤0.015%, Cu :≤0.20%, Sn :≤0,03%, Sb :≤0.01%, As :≤0.04%, B :≤0.005%, [N] :≤0.009%, [0] :≤0.0020%, [H] :≤0.0002%, all the other are Fe; CN 98110160.7 discloses the production method of high-intensity high-tenacity mooring chain steel and mooring chain, and steel grade is 25CrMn2Mo, is used to make 4 grades of marine mooring chains of R; CN 99116494.6 discloses a kind of four-grade mooring chain steel, and the chemical component weight per-cent of this steel is carbon 0.25-0.30, silicon 0.15-0.37, manganese 0.90-1.70, chromium 0.90-1.70, molybdenum 0.40-0.60, aluminium 0.01-0.06, nickel 0.00-0.20, copper 0.00-0.25, phosphorus 0.000-0.025, sulphur 0.000-0.025, niobium 0.02-0.04, surplus is an iron; All contain Mn, Cr, Ni, Mo principal element in the steel alloy that RU 2101381 and EP20040002612 disclose.In the above-mentioned patent documentation in the disclosed steel alloy, Ni, Mo content are higher, and suitable with the 23MncrNiMo54 steel, production cost is higher.Above-mentioned CN 00109053.4 CN98110160.7, CN 98110160.7, CN 99116494.6 all are high strength mooring chain steels, if be used to produce circle chain of mine, also exist alloying element Mn, Cr, Ni, Mo content height, the hardening capacity height, steel roll back hardness height, can not satisfy the requirement of round-link chain shearing blanking, need carry out anneal, the shortcoming that the high cost of alloy and the increase of annealing operation cause the steel production cost to significantly improve.All do not have the continuous annealing operation after rolling in the at present a lot of iron and steel enterprises of China simultaneously, the off-line annealing cost is higher, and quality also is difficult for guaranteeing.
Summary of the invention
Technical problem to be solved by this invention is: a kind of ring chain steel for mine is provided, it has higher hardening capacity and good flash welding performance, production process is simplified, make production cost significantly reduce, also just overcome existing C level ring chain steel 25MnV, the hardening capacity deficiency that the 23SiMnV steel exists in big specification C level round-link chain production process is difficult to satisfy the mechanical property of standard code, the 25SiMnMoV steel is because of the high flash welding performance that influences steel of Si content, thereby the 23MnNiCrMo54 steel because of expensive alloying element content high and complicated production technique cause its steel production cost very high and produce in steel product quality be difficult to obtain stable control and cause quality can't reach the shortcoming that foreign level has reduced the production efficiency of round-link chain.
The present invention solves this technical problem the technical scheme that is adopted: the mass percent that chemical ingredients that ring chain steel for mine of the present invention comprises is formed is: C 0.17～0.30%, Mn 1.2～2.0%, Si 0.1～0.8%, Mo 0.1～0.5%, Cr 0.1～0.8%, V and/or Nb 0.03～0.15%, Al 0.02～0.05%, S≤0.03%, P≤0.03%, Cu≤0.2%, all the other are Fe.
The reasons are as follows of the effect of the various chemical ingredientss of ring chain steel for mine of the present invention and qualification consumption:
Carbon is the important element of making big specification C level ring chain steel, and it plays an important role to the plasticity of steel matrix, toughness and to the welding strength and the toughness of welding line.Studies show that under manganese content condition with higher, when matrix was bainite or martensite, carbon content surpassed 0.3%, the plasticity that makes steel especially relative reduction in area and impact value are descended greatly; Consider the requirement of circle chain of mine product to wear resistance simultaneously, carbon content is a lower limit with 0.17%.
Manganese is the main alloy element of adding in the ring chain steel for mine of the present invention, and it cooperates interpolation with a spot of molybdenum, and structural transformation kinetics that can the remarkably influenced steel plays the effect that suppresses diffusion transformation, significantly improves the hardening capacity of steel.Simultaneously, its solid solution is played the solution strengthening effect in ferrite.Take all factors into consideration the requirement of round-link chain mechanical property, processing performance and the operational path that steel are produced, manganese content is defined as 1.2%～2.0%.
Secular round-link chain production practice show, the adding of alloying element molybdenum can improve the flash welding performance of steel, particularly improves the anti-overheated ability in the butt welding process.The combined action of molybdenum and manganese can significantly improve austenitic stability again simultaneously, improves the hardening capacity of steel, reaches the requirement of standard with the mechanical property of guaranteeing big specification round-link chain.The adding of too much molybdenum will make steel product cost significantly increase, and action effect no longer includes remarkable lifting, so the content of molybdenum is defined as 0.1%～0.5%.
The interpolation of elemental silicon mainly is in order to improve the anti-tempering ability of steel, to improve the yield strength of steel, making the test elongation of finished product round-link chain satisfy request of national standard.Consider the increase of silicone content,, when carrying out flash welding,, produce high temperature, cause the overheated of material, because silicon is easy to oxidation, form when being mingled with simultaneously, butt welded seam is caused serious harm making the flame current of material increase with increasing the resistance of material.Therefore in ring chain steel for mine of the present invention, different with the steel grade of being developed in the past, the content of silicon is limited, only add as additional elements, the addition of silicon is lower than 0.8%.
The interpolation of chromium mainly is in order to be fit to the production of big specification round-link chain, to guarantee its hardening capacity, thereby have the good mechanical performance.Consider the interaction of adding element, the highest addition of chromium is no more than 0.8%.
In order to make the ring chain steel raw material have evenly tiny tissue, ring chain steel for mine of the present invention has adopted vanadium and/or Nb-microalloying, improve the tissue of flash welding commissure and heat affected zone simultaneously, grain growth when also helping to suppress to quench heating, thus make steel have good plasticity and toughness.
Aluminium is remaining element after the deoxidation in the smelting process of steel just.
Sulphur, phosphorus and copper all are impurity elements, and its content is few more good more.
The preparation method of ring chain steel for mine of the present invention is: the chemical ingredients by the invention described above ring chain steel for mine is formed batching, by converter steelmaking or Electric furnace steel making, LF refining is that ladle refining, continuous small-billet casting and hot rolling technology route are produced, and these processing steps all are that metallurgical technology field is known.
The operational path that ring chain steel for mine of the present invention is used to produce round-link chain is: it is known that shearing blanking, hot volume, sandblast, flash welding, preliminary draft, modified thermal treatment and secondary preliminary draft, these processing steps also all are that round-link chain is made the field.
Ring chain steel for mine of the present invention is used to prepare the high-tensile round-link chain of coal winning machinery and Transport Machinery.
The invention has the beneficial effects as follows: ring chain steel for mine of the present invention is the theory according to diffusion transformation and martensitic transformation, utilize alloying element in steel interaction and a kind of low cost new round-link chain developed with low-carbon (LC) multi-element low alloy steel, in order to replace expensive 23MnNiCrMo54 steel, make the big specification C grade high-strength circle chain of mine of diameter 〉=φ 22mm, thereby obtain remarkable economic efficiency.The present invention designs by best alloying composition, compares with existing C level ring chain steel to have high cost performance.
1. compare with 25MnV, 23MnSiV steel, ring chain steel for mine of the present invention has higher hardening capacity, thereby can be used for making the above round-link chain of diameter 18mm, overcome the shortcoming that hardening capacity deficiency that the big specification C level of existing production ring chain steel 25MnV, 23MnSiV exist is difficult to satisfy the mechanical property of standard code in the round-link chain production process.
2. the use properties according to high strength C level round-link chain requires and manufacturing technique requirent, and in conjunction with existing converter or Electric furnace steel making+LF refining+continuous casting+hot rolled production process route and equipment, it is the using-system of round-link chain product that the design of ring chain steel for mine of the present invention is based on the low carbon martensite, adopt best Mn, Mo, Cr, the multi-element alloyed effect of Si, behind Q-tempering, satisfy every mechanical property requirements of round-link chain, simultaneously under hot-rolled condition, can obtain non-martensite microstructure, that saves the 23MnCrNiMo54 steel rolls the after annealing operation, has uniform tissue and lower hardness, the shearing blanking that helps round-link chain, when the big hot chaining of specification, can reach the weld gap uniformity, have good flash welding performance.
3. ring chain steel for mine of the present invention is under the prerequisite of guaranteeing deep processed product round-link chain mechanical property and processing performance, compare with the 23MnNiCrMo54 steel, saved valuable alloying element Ni, the content of Alloy Elements Mo decreases, the Electric furnace steel making or the converter steelmaking+LF refining+continuous small-billet casting+hot rolling technology route that adopt China's steel-making enterprise generally to build are produced, needn't adopt and roll after annealing, the production process of steel is simplified, and production cost significantly reduces.Also avoided simultaneously the 23MnNiCrMo54 steel to roll the inhomogeneous and problem of influence welding of tissue, hardness that after annealing causes.The tissue of steel and quality obtain stable control, have good round-link chain production technique performance.Be better than the requirement of GB/T12718-2001 with the round-link chain mechanical property of ring chain steel for mine manufacturing of the present invention, will improve the economic benefit of steel production in China enterprise and coal mine machinery factory widely.
Embodiment
Embodiment 1
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.17%, Mn 2.0%, Si 0.1%, Mo 0.5%, Cr 0.1%, V 0.11%, Nb 0.03%, Al 0.02%, S 0.03%, Cu 0.08%, all the other are Fe; With this batching through electrosmelting, LF refining, 150 billet continuous castings, be rolled into the high strength ring chain steel for mine that φ 22mm is used for coal winning machinery and Transport Machinery ore deposit; Make 22 * 86 round-link chain finished products through shearing blanking, hot volume, sandblast, flash welding, preliminary draft, modified thermal treatment, secondary preliminary draft again.
This round-link chain anti-bending strength: under 880 ℃ of quenchings, 420 ℃/1.5 hours tempered condition, it is crooked qualified to press the GB/T12718-91 check; Tensile mechanical properties: breaking load 750KN, Breaking elongation 15%, test elongation 1.4%; Fatigue property: greater than 30000 times.
Embodiment 2
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.17%, Mn 2.0%, Si 0.1%, Mo 0.5%, Cr 0.1%, V 0.15%, Al 0.02%, P 0.01%, S 0.03%, Cu 0.08%, all the other are Fe; Other are with embodiment 1.
Embodiment 3
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.17%, Mn 2.0%, Si 0.1%, Mo 0.5%, Cr 0.1%, Nb 0.15%, Al 0.02%, P 0.01%, S 0.03%, Cu 0.08%, all the other are Fe; Other are with embodiment 1.
Embodiment 4
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.23%, Mn 1.5%, Si 0.4%, Mo 0.3%, Cr 0.4%, V 0.09%, Nb 0.03%, Al 0.03%, S 0.01%, P 0.02%, Cu 0.13%, all the other are Fe; With this batching through converter melting, LF refining, 150 billet continuous castings, be rolled into the high strength ring chain steel for mine that φ 26mm is used for coal winning machinery and Transport Machinery ore deposit; Make 26 * 92 round-link chain finished products through shearing blanking, hot volume, sandblast, flash welding, preliminary draft, modified thermal treatment, secondary preliminary draft again.
This round-link chain anti-bending strength: under 880 ℃ of quenchings, 420 ℃/1.5 hours tempered condition, it is crooked qualified to press the GB/T12718-91 check; Tensile mechanical properties: breaking load 930KN, Breaking elongation 14%; Test elongation 1.4%; Fatigue property: greater than 30000 times.
Embodiment 5
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.23%, Mn 1.5%, Si 0.4%, Mo 0.3%, Cr 0.4%, Nb 0.09%, Al 0.03%, S 0.02%, P 0.01%, Cu 0.13%, all the other are Fe; Other are with embodiment 4.
Embodiment 6
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.23%, Mn 1.5%, Si 0.4%, Mo 0.3%, Cr 0.4%, V 0.09%, Al 0.03%, S 0.01%, P 0.01%, Cu 0.13%, all the other are Fe; Other are with embodiment 4.
Embodiment 7
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.30%, Mn 1.2%, Si 0.8%, Mo 0.1%, Cr 0.8%, V 0.03%, Nb 0.08%, Al 0.05%, P 0.03%, Cu 0.2%, all the other are Fe; With this batching through converter melting, LF refining, 150 billet continuous castings, be rolled into the high strength ring chain steel for mine that φ 30mm is used for coal winning machinery and Transport Machinery; Make 30 * 126 round-link chain finished products through shearing blanking, hot volume, sandblast, flash welding, preliminary draft, modified thermal treatment, secondary preliminary draft again.
This round-link chain anti-bending strength: under 880 ℃ of quenchings, 420 ℃/1.5 hours tempered condition, it is crooked qualified to press the GB/T12718-91 check; Tensile mechanical properties: breaking load 1220KN, Breaking elongation 14.5%; Test elongation 1.1%; Fatigue property: greater than 30000 times.
Embodiment 8
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.30%, Mn 1.2%, Si 0.8%, Mo 0.1%, Cr 0.8%, V 0.03%, Al 0.05%, S 0.01%, P 0.03%, Cu 0.2%, all the other are Fe; Other are with embodiment 7.
Embodiment 9
The mass percent that the chemical ingredients of ring chain steel for mine batching is formed is: C 0.30%, Mn 1.2%, Si 0.8%, Mo 0.1%, Cr 0.8%, Nb 0.03%, Al 0.05%, S 0.03%, P 0.01%, Cu 0.2%, all the other are Fe; Other are with embodiment 7.
Embodiment 10-17
The mass percent that the ring chain steel for mine chemical ingredients of listing by table 1 is formed, adopt Nb, V combined microalloying, V is or/and Nb 0.03～0.15%, the rest is Fe batching, with this batching through electrosmelting, LF refining, 150 billet continuous castings, be rolled into the high strength ring chain steel for mine that is used for coal winning machinery and Transport Machinery of the listed diameter of table 1.
Table 2 is listed the mechanical property of the ring chain steel for mine of the present invention of different size in the table 1.
Table 3 is listed the mechanical property of the ring chain steel for mine of the present invention of different size in the table 1 through the round-link chain finished product of shearing blanking, hot volume, sandblast, flash welding, preliminary draft, the modified thermal treatment of Medium frequency induction, the trial-production of secondary preliminary draft operational path.The mensuration of mechanical property is undertaken by GB/T12718-2001, and its result meets the requirement of GB/T12718-2001 fully.
Table 1 ring chain steel for mine chemical ingredients is formed (quality %)
| Chain number | Specification | C | Si | Mn | Cr | Mo | Al | P | S | Cu | |
| 10 | L201 | Φ22 | 0.22 | 0.56 | 1.55 | 0.20 | 0.30 | 0.025 | 0.02 | 0.015 | 0.08 |
| 11 | L202 | Φ22 | 0.23 | 0.66 | 1.35 | 0.20 | 0.40 | 0.03 | 0.008 | 0.025 | 0.10 |
| 12 | L203 | Φ22 | 0.18 | 0.25 | 1.67 | 0.25 | 0.35 | 0.027 | 0.015 | 0.020 | 0.11 |
| 13 | L204 | Φ26 | 0.24 | 0.72 | 1.20 | 0.55 | 0.32 | 0.025 | 0.02 | 0.025 | 0.08 |
| 14 | L205 | Φ26 | 0.24 | 0.63 | 1.25 | 0.62 | 0.35 | 0.022 | 0.018 | 0.020 | 0.09 |
| 15 | L206 | Φ26 | 0.25 | 0.58 | 1.30 | 0.58 | 0.33 | 0.023 | 0.009 | 0.025 | 0.10 |
| 16 | L207 | Φ30 | 0.24 | 0.42 | 1.35 | 0.66 | 0.43 | 0.025 | 0.013 | 0.026 | 0.08 |
| 17 | L208 | Φ30 | 0.26 | 0.38 | 1.66 | 0.45 | 0.28 | 0.028 | 0.016 | 0.022 | 0.13 |
The mechanical property of table 2 ring chain steel for mine
The mechanical property of table 3 circle chain of mine
| Chain number | Specification | The test elongation, % | Breaking load, KN | Breaking elongation, % | Weld seam impact toughness, J | Fatigue property | Bending property |
| L201 | Φ22 | 1.40 | 750 | 15 | 88 | 55000 | Qualified |
| L202 | Φ22 | 1.22 | 755 | 18 | 92 | 42000 | Qualified |
| L203 | Φ22 | 1.44 | 740 | 16 | 86 | 41000 | Qualified |
| L204 | Φ26 | 1.16 | 950 | 14 | 82 | 38000 | Qualified |
| L205 | Φ26 | 1.36 | 960 | 15 | 88 | 48000 | Qualified |
| L206 | Φ26 | 1.26 | 930 | 16 | 82 | 38000 | Qualified |
| L207 | Φ30 | 1.40 | 1260 | 16 | 88 | 37000 | Qualified |
| L208 | Φ30 | 1.42 | 1240 | 15 | 84 | 40000 | Qualified |
Claims (1)
1. ring chain steel for mine is characterized in that: the mass percent that the chemical ingredients that this ring chain steel for mine comprises is formed is: C 0.18～0.25%, Mn 1.2～1.67%, Si 0.25～0.72%, Mo 0.3～0.43%, Cr 0.2～0.66%, V and/or Nb 0.03～0.15%, Al 0.022～0.03%, S≤0.03%, P≤0.03%, Cu≤0.2%, all the other are Fe.
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| JPH02175840A (en) * | 1988-12-28 | 1990-07-09 | Nippon Steel Corp | Steel for large-diameter chain having high strength and high toughness |
| CN1202533A (en) * | 1998-04-17 | 1998-12-23 | 莱芜钢铁总厂 | High strength high toughness steel for mooring chain and production method of mooring chain |
| CN1275631A (en) * | 1999-05-27 | 2000-12-06 | 冶钢集团有限公司 | Four-grade mooring chain steel |
| CN1108397C (en) * | 2000-06-02 | 2003-05-14 | 江阴兴澄钢铁有限公司 | High-strength, high-toughness and corrosion resistant mooring chain steel and its production process |
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| CN1818118A (en) | 2006-08-16 |
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