CN103160755B - A kind of straightening roll for aligning round steel bar - Google Patents
A kind of straightening roll for aligning round steel bar Download PDFInfo
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- CN103160755B CN103160755B CN201310129138.7A CN201310129138A CN103160755B CN 103160755 B CN103160755 B CN 103160755B CN 201310129138 A CN201310129138 A CN 201310129138A CN 103160755 B CN103160755 B CN 103160755B
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Abstract
The invention provides a kind of straightening roll technical scheme for aligning round steel bar, the program includes roll shaft and roller shell, and the material of roller shell described in this programme is high-chromium alloy, high-chromium alloy predominant quantity per-cent used is: C:2.4-3.0%, Cr:12-23%, Ni:1.0-2.0%, Mo:1.5-3.0%, V :≤0.9%, Si:0.5-1.2%, Mn:0.5-1.5%, S :≤0.035%, P :≤0.06%, Re:0.03-0.05%, all the other are Fe and inevitable impurity.In described roller shell matrix, except having a large amount of microhardness except the M7C3 type carbide of 1500-2000HV is also uniformly distributed in strip and block, roller shell also just possesses the matrix based on martensite before use.The hardness of described roller shell is HRC=58-62.The material that described roll shaft adopts is 35CrMo or 42CrMo structural alloy steel.
Description
Technical field
What the present invention relates to is steel rolling part in metallurgy industry, especially a kind of straightening roll for aligning round steel bar.
Background technology
Very large in the industrial scale of China's special steel bar, because the original curvature of special steel bar is large, flow stress and yield strength high, therefore need bear many surging force, stress and the force of rolling friction larger than steel pipe during straightening roll work.Also to stand the test of alternating hot and cold, chilling and shock heating simultaneously.Therefore in special steel is produced, the performance of special steel bar material straightening roller and manufacturing technology are had higher requirement.
At present, the roller shell of domestic round steel bar straightening roll, adopts 9Cr2,9CrSi, 9Cr2Mo or 9Cr2MoV alloy wrought steel to be material usually, forms through forging and heat treatment process.The straightening roll of this alloy wrought steel only has 5-8 millimeter due to roller shell working lining full hardening deepness, and the use comdemning period of straightening roll working lining is the 15-20 millimeter of half warp, the working lining thickness of obvious forged steel straightening roll roller shell can not meet the requirement of the comdemning period of bar material straightening roll sleeve far away.Thermal treatment process is complicated and be difficult to control besides, often there is the segregation of through hardening layer composition in roller shell in the fabrication process, hardness is uneven, the phenomenons such as cracking, thus cause that scrap rate is high, yield rate is low, add roller shell blank forging surplus larger, cause a large amount of starting material and energy dissipation, also increase manufacturing cost.There is many problems in the straightening roll due to alloy wrought steel manufacture, so someone proposes to adopt rich chromium cast iron to manufacture straightening roll, No. 2006101051487, Chinese patent just provides a kind of technical scheme adopting casting rich chromium cast iron or casting cast steel with high chromium steel pipe straightening roll, the program solves the disadvantage of the straightening roll existence that alloy wrought steel manufactures really, but also also have weak point, this exactly straightening roll is only applicable to for tubing such as aligning weldless steel tubes, and can not meet aligning need bear the many surging force larger than steel pipe, the special steel bar of stress and force of rolling friction, this is the weak point existing for prior art.
Summary of the invention
Technical problem to be solved by this invention, be exactly for the deficiency existing for prior art, and a kind of straightening roll technical scheme for aligning round steel bar is provided, the program have employed the roller shell of the high-chromium alloy processing straightening roll of high-carbon and Gao Ge, makes roller shell have high-wearing feature and shock resistance; Adopt Structural Alloy Steel to process the roll shaft of straightening roll, make roll shaft ensure that required intensity, toughness and workability energy, reach and can bear large surging force, stress and force of rolling friction.
This programme is achieved by the following technical measures: with the straightening roll of high-chromium alloy aligning round steel bar, include roll shaft and roller shell, the feature of this programme is the material of described roller shell is high-chromium alloy, high-chromium alloy predominant quantity per-cent used is: C:2.4-3.0%, Cr:15-23%, Ni:1.0-2.0%, Mo:1.5-3.0%, V :≤0.9%, Si:0.5-1.2%, Mn:0.5-1.5%, S :≤0.035%, P :≤0.06%, Re:0.03-0.05%, all the other are Fe and inevitable impurity.The concrete feature of this programme also has, and in described roller shell matrix, except having a large amount of microhardness and being uniformly distributed at the M7C3 type carbide of 1500-2000HV and in strip and block, roller shell also just possesses the matrix based on martensite before use.The hardness of described roller shell is HRC=58-62.The material that described roll shaft adopts is 35CrMo or 42CrMo structural alloy steel.
The beneficial effect of this programme can be learnt according to describing of such scheme, owing to have employed the roller shell of the high-chromium alloy processing straightening roll of high-carbon and Gao Ge in this scenario, carbon is the most basic element forming carbide, carbide quantity in tissue can be made when carbon content is too low to reduce, in process of setting, composition segregation is produced time too high, easily there is M3C type cementite carbide in matrix, the wear resistance of roller shell and heat crack resistance can be made to decline, for controlling carbide quantity in tissue in right amount, the shape size of choose reasonable carbide and distribution characteristics thereof, carbon content controls within the scope of the 2.4-3.0% higher than general rich chromium cast iron by this programme, chromium ensures that roller shell produces the basic alloy element of excellent wear-resisting property and toughness, when chrome content is less than 10%, M3C cementite will be separated out, M23C6 type carbide will be separated out when content is more than 25%, therefore chromium content be less than 10% or more than 25% time all can reduce the hardness of carbide, therefore this programme elects chrome content as 12-23%, a little more than the chrome content of general rich chromium cast iron, ensure that roller shell has high-wearing feature and shock resistance feature.Adopt Structural Alloy Steel to process the roll shaft of straightening roll, make roll shaft ensure that required intensity, toughness and workability energy, reach and can bear large surging force, stress and force of rolling friction.As can be seen here, compared with prior art, have outstanding substantive distinguishing features and significant progress, its beneficial effect implemented also is apparent in the present invention.
Accompanying drawing explanation
Fig. 1 is the partial cross structural representation of the specific embodiment of the invention.
In figure, 1 is roll shaft, and 2 is roller shell.
Embodiment
For the technical characterstic of this programme can be clearly demonstrated, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
This programme, for aligning the straightening roll of round steel bar, has roll shaft 1 and roller shell 2, and described in this programme, the material of roller shell 2 is high-chromium alloy, high-chromium alloy predominant quantity per-cent used is: C:2.4-3.0%, Cr:15-23%, Ni:1.0-2.0%, Mo:1.5-3.0%, V :≤0.9%, Si:0.5-1.2%, Mn:0.5-1.5%, S :≤0.035%, P :≤0.06%, Re:0.03-0.05%, all the other are Fe and inevitable impurity.Wherein, carbon is the most basic element forming carbide, carbide quantity in tissue can be made when carbon content is too low to reduce, in process of setting, producing composition segregation time too high, easily there is M3C type cementite carbide in matrix, and the wear resistance of roller shell 2 and heat crack resistance can be made to decline, for controlling carbide quantity in tissue in right amount, the shape size of choose reasonable carbide and distribution characteristics thereof, this embodiment adopts high carbon content, by carbon content preferably at 2.9-3.0%; Chromium ensures that roller shell 2 produces the basic alloy element of excellent wear-resisting property and toughness, when chrome content is less than 10%, M3C cementite will be separated out, M23C6 type carbide will be separated out when content is more than 25%, when chromium content be less than 10% or more than 25% time all can reduce the hardness of carbide, this embodiment adopts high chromium content, and chrome content is preferably 22.5-23%; Nickel adds to make roller shell have good hardening capacity concurrently, nickel content does not have hardening effect when being less than 1.0%, and residual austenite cognition during more than 2.0% in matrix rolls up, cause roller shell 2 matrix hardness to decline, this embodiment adopts and the content of nickel is preferably 1.5-1.6%; Molybdenum is the temper resistance in order to improve alloyed cast iron; Molybdenum enters in carbide the effect being improved carbide hardness, the M7C3 type carbide formed by molybdenum and chromium has very high microhardness, but when molybdenum content is less than 1.5%, strengthening effect is not obvious, when more than 1.5% setting rate accelerate, this embodiment by molybdenum content preferably at 2.5-3.0%; Vanadium is to strengthen matrix, and refinement cast structure improves the distribution of carbide, but the tendency that vanadium forms carbide than chromium is large, and for preventing vanadium from generating single carbide, vanadiumcontent is strict controlled in less than 0.9% by this embodiment; Silicon is reductor, it also has reduces casting flaw and improves the effect of molten iron flow, and when silicone content is less than 0.5%, deoxidation effect is not obvious, and easily occurs ferrite during more than 1.2% in matrix, hardness can be made to reduce, and this embodiment silicon content is preferably 1.1-1.2%; Manganese is deoxidation auxiliary, adds the non-metallic inclusion that rationally can reduce in molten iron, and the manganese content that this embodiment adopts is preferably 1.1-1.3%; Sulphur and phosphorus are the harmful elements that surfactivity is very strong, therefore, this embodiment sulphur and phosphorus content are controlled sulphur lower than 0.035% and phosphorus lower than 0.06%; This programme also adds the rare earth having and molten iron is carried out to Metamorphism treatment, and this embodiment Re add-on is 0.03-0.05%.This programme by above-mentioned composition melt iron, adopts casting technique to cast out required roller shell 2 blank, through destablizing by after the residual austenite decomposition and inversion of 45-65% is martensitic stucture in roller shell 2 matrix, carries out machining and produces finished product roller shell 2.Therefore, in described roller shell 2 matrix, except having a large amount of microhardness except the M7C3 type carbide of 1500-2000HV is also uniformly distributed in strip and block, roller shell 2 also just possesses the matrix based on martensite before use, therefore the hardness of described roller shell 2 can be made to be HRC=58-62.
The material that described roll shaft 1 adopts is 35CrMo or 42CrMo structural alloy steel, adopts forging, machining and thermal treatment to obtain product roll shaft 1, then by finished product roller shell 2 with the finished product roll shaft 1 processed through being assembled into straightening roll.
For the effect of this programme can be described, illustrate by following actual experiment:
1. on Φ 85 7 roller cross roll bar straightener, use 4 months by the Φ 85 bar material straightening roller of this programme manufacture and align alloy structure Steel Bar about 4.2 ten thousand tons altogether, and existing forged steel straightening roll normally uses as about 1.6-2 ten thousand tons, steel transportation amount is more than the twice of forged steel straightening roll.
2. press 7, the Φ 100 bar material straightening roller that this programme manufactures, Φ 100 7 roller bar straightener uses 165 days, about 6.32 ten thousand tons, common aligning alloy tool steel round steel is scrapped from using, and existing forged steel straightening roll steel transportation amount is only 2.6-2.8 ten thousand tons, its wear resistance is also at more than 2 times of forged steel straightening roll.
3. press a set of 7 of the Φ 130 bar material straightening roller that this programme manufactures, Φ 130 7 roller cross-roll straightening machine uses, aligning closes knot Steel Bar about 9.62 ten thousand tons altogether, and existing forged steel straightening roll steel transportation amount is only about 40,000 tons.
4. press a set of totally 7 of the Φ 180 bar material straightening roller that this programme manufactures, wherein: live roll 4, driven roll 2,1, tail roller, Φ 180 bar straightener uses six months, align alloy tool Steel Bar 18.36 ten thousand tons altogether, and existing forged steel straightening roll is about 6.5-7 ten thousand tons.
5. press totally 7, the large-scale bar material straightening roller of Φ 220 that this programme manufactures, wherein drive roll 4, driven roll 2,1, tail roller, large-scale bar straightener Φ 220 unit uses 8 months, amount to aligning and close knot Steel Bar more than 350,000 ton, and existing forged steel straightening roll steel transportation amount is about 180,000 tons.
The steel transportation amount added up as can be seen from above-mentioned actual experiment production process, this programme shows very excellent wear resistance and reliability in actual applications.After operation for some time, the wearing and tearing due to working face make smooth finish better, also improve the visual appearance of alloy bar material product.
The present invention is not limited in above-mentioned embodiment, the change that those of ordinary skill in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (3)
1. for aligning a straightening roll for round steel bar, including roll shaft and roller shell, it is characterized in that: the material of described roller shell is high-chromium alloy, high-chromium alloy predominant quantity per-cent used is: C:2.4-3.0%, Cr:15-23%, Ni:1.0-2.0%, Mo:1.5-3.0%, V :≤0.9%, Si:0.5-1.2%, Mn:0.5-1.5%, S :≤0.035%, P :≤0.06%, Re:0.03-0.05%, all the other are Fe and inevitable impurity; In described roller shell matrix, except having a large amount of microhardness except the M7C3 type carbide of 1500-2000HV is also uniformly distributed in strip and block, roller shell also just possesses the matrix based on martensite before use.
2. straightening roll according to claim 1, is characterized in that: the hardness of described roller shell is HRC=58-62.
3. straightening roll according to claim 1, is characterized in that: the material that described roll shaft adopts is 35CrMo or 42CrMo structural alloy steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310129138.7A CN103160755B (en) | 2013-04-15 | 2013-04-15 | A kind of straightening roll for aligning round steel bar |
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| CN201310129138.7A CN103160755B (en) | 2013-04-15 | 2013-04-15 | A kind of straightening roll for aligning round steel bar |
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| CN103160755A CN103160755A (en) | 2013-06-19 |
| CN103160755B true CN103160755B (en) | 2016-04-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107427893B (en) * | 2015-03-26 | 2019-06-11 | 日立金属株式会社 | Cold-working tool and its manufacturing method |
| CN108277436B (en) * | 2018-03-27 | 2019-06-11 | 东北大学 | A kind of high-toughness wear-resistant bimetallic composite roll set and preparation method |
| CN113798351B (en) * | 2021-10-08 | 2024-06-14 | 内蒙古北方重工业集团有限公司 | Thermal correction method for large-scale frame thin-wall parts |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06264112A (en) * | 1993-03-12 | 1994-09-20 | Hitachi Metals Ltd | Roll for straightening steel tube |
| CN1970184A (en) * | 2006-12-12 | 2007-05-30 | 袁厚之 | Steel pipe-straightening roller for casting high chromium iron or high chrome steel |
| CN101153377A (en) * | 2006-09-27 | 2008-04-02 | 宝山钢铁股份有限公司 | Leveler roll and manufacturing process thereof |
| CN102839316A (en) * | 2012-09-28 | 2012-12-26 | 石家庄市诚达耐磨材料有限公司 | Ultrahigh chromium grinding ball and processing process thereof |
-
2013
- 2013-04-15 CN CN201310129138.7A patent/CN103160755B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06264112A (en) * | 1993-03-12 | 1994-09-20 | Hitachi Metals Ltd | Roll for straightening steel tube |
| CN101153377A (en) * | 2006-09-27 | 2008-04-02 | 宝山钢铁股份有限公司 | Leveler roll and manufacturing process thereof |
| CN1970184A (en) * | 2006-12-12 | 2007-05-30 | 袁厚之 | Steel pipe-straightening roller for casting high chromium iron or high chrome steel |
| CN102839316A (en) * | 2012-09-28 | 2012-12-26 | 石家庄市诚达耐磨材料有限公司 | Ultrahigh chromium grinding ball and processing process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 高铬合金轧辊和矫直辊的研制及推广;袁厚之;《焊管》;20090331;第32卷(第3期);第31-34页 * |
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