CN102758148A - High-speed steel for roller - Google Patents

High-speed steel for roller Download PDF

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Publication number
CN102758148A
CN102758148A CN2012102330312A CN201210233031A CN102758148A CN 102758148 A CN102758148 A CN 102758148A CN 2012102330312 A CN2012102330312 A CN 2012102330312A CN 201210233031 A CN201210233031 A CN 201210233031A CN 102758148 A CN102758148 A CN 102758148A
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China
Prior art keywords
roll
steel
rapid steel
rapid
roller
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CN2012102330312A
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Chinese (zh)
Inventor
贾绍宽
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WUXI DRILLTO TRENCHLESS CO Ltd
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WUXI DRILLTO TRENCHLESS CO Ltd
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Priority to CN2012102330312A priority Critical patent/CN102758148A/en
Publication of CN102758148A publication Critical patent/CN102758148A/en
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Abstract

The invention discloses a high-speed steel for a roller. The chemical composition of the high-speed steel comprises the following components by weight percent: 3.2-3.6% of C, 1.2-1.6% of W, 5.0-7.0 of Mo, 2.0-3.0% of V, 8.0-10.0% of Cr, 0.1-0.4% of Al, 2.2-2.6% of Ni, 6.5-7.5% of Co, 0.2-0.4% of Nb, 0.2-0.4% of Ti, 0.4-0.6% of Ce, 0.05-0.20% of Zr, less than 0.8% of Si, less than 1.5 % of Mn, less than 0.03% of S, less than 0.04% of P, and the balance of Fe.

Description

A kind of roll is used rapid steel
Technical field
The present invention relates to the ferrous metallurgy field, particularly a kind of rapid steel.
Background technology
Roll is one of main consumption spare part during steel rolling is produced, and roll consumption is about 5%~15% of steel rolling production cost.Shut down, fall factors such as product and maintenance of the equipment increase if consider the production that brings because of roll consumption, then the proportion of its shared production cost can be higher.Roll quality not only is related to steel rolling production cost and milling train production operational availability, also influences mill bar quality to a great extent.Along with the development of steel rolling technology, rolling mill speed and level of automation improve constantly, and breaker roll quality particularly wear resistance, intensity and the toughness etc. of roll is had higher requirement.In recent years, because to the specific demand of rolling stock, the performance of the size of stocking, surface accuracy, stocking is all had higher requirement.In addition, along with the development of rolling technique, the Working environment of roll is also more and more harsher, is example with the hot continuous rolling, and roll is under high temperature, high loading, the high-speed mal-condition for a long time, and the performance requriements of breaker roll is higher.How improving roller performance to adapt to the needs of milling train, is the new problem that roll development person faces.
In common rapid steel, increase carbon content and content of vanadium, can increase the quantity of high firmness MC type carbide, improve the wear resistance of rapid steel.Replacing rich chromium cast iron, infinitely chilled ductile cast iron and casting half steel to make roll with high-carbon high-high-vanadium high-speed steel at present is one of main developing direction.Chinese invention patent CN1631565 discloses a kind of High Vanadium Rapid Steel Composite Roll And Production Technology; Roll is divided into roller core and roll wearing layer; Roller core adopts toughness low alloy steel or mild steel material making preferably; The roll wearing layer adopts the high-vanadium high-speed steel material, and the principal element content of this high-vanadium high-speed steel is: C:1.8~3.5%, V:7~12%, Cr:4~5%, Mo:2~4%, Ni:0.5~1.5%, surplus are iron.Its production technique is: roller core and roll wearing layer are one through the compound founding of induction heating consecutive solidification crystallization method.The invention roll vanadium content is too high, prone to low hardness M 3 C type carbides, reduce the wear resistance of high speed steel (good and Miyasaka, Yoshihiro Kataoka, soup Koji Nakata high carbon steel Full speed carbide formation and ぼ す van ni inner zip ウ impact of Rousseau added, casting Engineering, 1997,69 (3): 201 ~ 206).Chinese invention patent CN1807671 discloses a kind of continuous composite high speed steel roll formula, and roller core adopts the alloy forged steel material of H.T., and the rapid steel composition that the outer body of roll adopts is (weight %): 1.5~3.5C; 2.0~7.0Cr, 2.0~7.0Mo, 4.0~10.0V; 4.0~10.0W; 0~10.0Co, < 2.0, surplus is Fe to Ni.Adopt this prescription can develop the composite high-speed steel roller that W, V content are high, segregation is light, wear resistance is good, can satisfy the hot continuous rolling technology requirement.This material high-speed steel roll can only adopt continuous recombining process to be shaped, and equipment complicacy and production efficiency are low, and when adopting centre spinning method to be shaped, element segregation is serious, reduces the roll wear resistance.Chinese invention patent CN1803325 discloses a kind of compound high speed steel roll and preparation method thereof, and the cladding material that it is characterized in that this composite roll is a rapid steel, and the core of the roll material is a graphitized steel, and the chemical ingredients of skin of the roll high speed steel material (weight %) is: 1.2~2.5C; 0.3~1.5Si, 0.4~1.0Mn, 3.0~8.0Cr, 2.0~7.0Mo; 2.0~7.0V, 1.0~5.0W, 0.01~0.5RE; < 0.05, < 0.05, surplus is Fe to S to P.The chemical ingredients (weight %) of core of the roll graphitized steel material is: 1.2~2.0C, 1.5~2.5Si, 0.3~1.0Mn; 0.5~1.5Ni, < 0.2, Mo < 0.2 for Cr; P 0.05, S < 0.05,0.01~0.2RE; 0.05~0.5Ca, surplus is Fe, and outer high speed steel material of composite roll and core graphitized steel material are metallurgical binding.Its method of manufacture is after adopting centrifugal casting technique with two kinds of metallic substance cast moldings; Again composite roll is carried out roughing and quenching heat treatment; Adopt this method to make roll; It is high to have core of the roll intensity, anti-accident ability strong with improve characteristics such as online work-ing life of roll and the rate of manufacturing a finished product significantly improve.But it is thick that this roller body is organized, and partially carbonized thing is continuous net-shaped distribution, and the roll thermal fatigue resistance is poor, is prone to be full of cracks during roll uses and peels off, and influences the normal use of roll.Chinese invention patent CN1339342 discloses a kind of method of manufacture of high speed steel roll ring; Its main points are to make the quick-cutting steel electrode hollow billet earlier; Be placed on then in the roller shell esr equipment with Quench mold and carry out esr, process blank, heat-treat again and machining.Its advantage is: roll sleeve crystal grain is tiny, homogeneous microstructure, and inclusion is few; There are not defectives such as shrinkage cavity, loose, element segregation; Performances such as wear resistance, obdurability are improved, increase the service life, can overcome the weak point that present centrifugal casting and CPC method etc. are made roll or roller shell; Further improve wear resistance and obdurability, can be used for making roller shell and rolls such as pipe-mill, high-speed rod pre-finishing mill, arrowband finishing mill and small section mill.There are deficiencies such as complex process, energy consumption height and efficient are low in this method.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of roll to use rapid steel, and this rapid steel hardness, intensity and toughness are high, and red hardness and wear resistance are good.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
A kind of roll is used rapid steel, and the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.2-3.6, W:1.2-1.6, Mo:5.0-7.0, V:2.0-3.0; Cr:8.0-10.0, Al:0.1-0.4, Ni:2.2-2.6, Co:6.5-7.5, Nb:0.2-0.4; T i:0.2-0.4, Ce:0.4-0.6, Zr:0.05-0.20, S i<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Preferably, the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.3-3.5, W:1.3-1.5, Mo:5.5-6.5, V:2.3-2.7; Cr:8.5-9.5, Al:0.15-0.35, Ni:2.3-2.5, Co:6.8-7.2, Nb:0.25-0.35; T i:0.25-0.35, Ce:0.45-0.55, Zr:0.10-0.15, Si<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Most preferably, the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.4, W:1.4, Mo:6.0, V:2.5; Cr:9.00, A l:0.25, Ni:2.4, Co:7.0, Nb:0.3; Ti:0.3, Ce:0.5, Zr:0.12, S i<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
The present invention compared with prior art has following beneficial effect:
The present invention has optimized the composition design of rapid steel, and wherein C is the fundamental element that forms wear-resisting phase carbide, and C content is low to cause carbide quantity few, therefore improves carbon content to 3.2-3.6%, is higher than 3.6% and will causes fragility to increase.W in rapid steel mainly with Fe 4W 2The C form exists, and when quenching heating, a part of Fe 4W2C dissolves in austenite, is present in the martensite after the quenching.W content increases, and can improve the rapid steel red hardness and reduce hot supersensitivity, but the too high ununiformity that can increase carbide of W content increases the fragility of steel, so W content is controlled at 1.2-1.6%.Mo is close to the influence and the W of rapid steel, and it is the principal element that promotes secondary hardening equally.V except cleaning molten steel, reduces outside inclusion and the gas content in rapid steel, mainly forms the MC type carbide of high firmness; The MC dissolving is very difficult during high temperature austenite; Increase V content in the rapid steel, can obviously improve wear resistance, but contain the V too high levels; Owing to be prone to be full of cracks along crystal boundary, so V content is controlled at 2.0-3.0%.Cr part in rapid steel is present in the M6C type carbide, also can form M 23C 6The type carbide also has about 40% to be present in the matrix.The Cr too high levels, the formation of the carbide that deposition was separated out when unnecessary Cr participated in tempering, this Cr of containing carbide is separated out when lesser temps easily, has reduced the thermostability of steel, therefore Cr content is controlled at 8.0-10.0%.Ni is a kind of non-carbide forming element, and its solid solution can improve the intensity and the thermal fatigue resistance of matrix in matrix, is favourable to freedom from cracking and the peel-ability that improves high-speed steel roll.Co:Co can improve Red Hardness of High Speed Steel, be very favorable to improving the high-speed steel roll high temperature abrasion resistance, but Co reduces rapid steel toughness, takes all factors into consideration Co content is controlled at 6.5-7.5%.Nb: contain alloying elements such as more W, Mo, Cr, V in the rapid steel, and the density difference of the carbide of these elements and formation thereof is very big, under centrifugal action, is prone to produce segregation, reduced the wear resistance of roll.Add Nb and can form the bigger MC type double carbide of density, it is poor to reduce carbide and fusant density, alleviates segregation, improves the roll wear resistance.Such design makes the each component coordinated, for the microtexture of steel provides assurance, thereby has guaranteed the performance of rapid steel.
Below in conjunction with embodiment the present invention is done further explain.These embodiment only are preferred embodiments of the present invention, but the present invention is not limited to these embodiment.
Embodiment
Embodiment one
A kind of roll is used rapid steel, and the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.2, W:1.6, Mo:5.0, V:3.0; Cr:8.0, Al:0.4, Ni:2.2, Co:7.5, Nb:0.2; Ti:0.4, Ce:0.4, Zr:0.20, Si<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Embodiment two
A kind of roll is used rapid steel, and the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.6, W:1.2, Mo:7.0, V:2.0; Cr:10.0, Al:0.1, Ni:2.6, Co:6.5, Nb:0.4; Ti:0.2, Ce:0.6, Zr:0.05, S i<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Embodiment three
A kind of roll is used rapid steel, and the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.3, W:1.5, Mo:5.5, V:2.7; Cr:8.5, Al:0.35, Ni:2.3, Co:7.2, Nb:0.25; Ti:0.35, Ce:0.45, Zr:0.15, S i<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Embodiment four
A kind of roll is used rapid steel, and the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.5, W:1.3, Mo:6.5, V:2.3; Cr:9.5, Al:0.15, Ni:2.5, Co:6.8, Nb:0.35; Ti:0.25, Ce:0.55, Zr:0.10, S i<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Embodiment five
A kind of roll is used rapid steel, and the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.4, W:1.4, Mo:6.0, V:2.5; Cr:9.00, Al:0.25, Ni:2.4, Co:7.0, Nb:0.3; T i:0.3, Ce:0.5, Zr:0.12, S i<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
Applicant's statement; The present invention explains detailed process equipment of the present invention and technical process through the foregoing description; But the present invention is not limited to above-mentioned detailed process equipment and technical process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technical process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.

Claims (3)

1. a roll is used rapid steel, it is characterized in that, the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.2-3.6, W:1.2-1.6, Mo:5.0-7.0; V:2.0-3.0, Cr:8.0-10.0, Al:0.1-0.4, Ni:2.2-2.6, Co:6.5-7.5; Nb:0.2-0.4, Ti:0.2-0.4, Ce:0.4-0.6, Zr:0.05-0.20, Si<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
2. a kind of roll as claimed in claim 1 is used rapid steel, it is characterized in that, the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.3-3.5, W:1.3-1.5, Mo:5.5-6.5; V:2.3-2.7, Cr:8.5-9.5, Al:0.15-0.35, Ni:2.3-2.5, Co:6.8-7.2; Nb:0.25-0.35, Ti:0.25-0.35, Ce:0.45-0.55, Zr:0.10-0.15, Si<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
3. a kind of roll as claimed in claim 2 is used rapid steel, it is characterized in that, the chemical constitution of said rapid steel is made up of following component by weight percentage: C:3.4, W:1.4, Mo:6.0; V:2.5, Cr:9.00, Al:0.25, Ni:2.4, Co:7.0; Nb:0.3, Ti:0.3, Ce:0.5, Zr:0.12, Si<0.8; Mn<1.5, S<0.03, P<0.04, all the other are Fe.
CN2012102330312A 2012-07-05 2012-07-05 High-speed steel for roller Withdrawn CN102758148A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104250802A (en) * 2013-06-28 2014-12-31 沈阳大陆激光成套设备有限公司 Process for performing laser cladding of superhard high speed steel by hot rolling of stretch reducing roller of seamless steel pipe
CN105296868A (en) * 2014-12-31 2016-02-03 芜湖金龙模具锻造有限责任公司 Wear resisting ultrahard high-speed steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104250802A (en) * 2013-06-28 2014-12-31 沈阳大陆激光成套设备有限公司 Process for performing laser cladding of superhard high speed steel by hot rolling of stretch reducing roller of seamless steel pipe
CN104250802B (en) * 2013-06-28 2017-02-08 沈阳大陆激光成套设备有限公司 Process for performing laser cladding of superhard high speed steel by hot rolling of stretch reducing roller of seamless steel pipe
CN105296868A (en) * 2014-12-31 2016-02-03 芜湖金龙模具锻造有限责任公司 Wear resisting ultrahard high-speed steel

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Application publication date: 20121031