CN102041454B - High hardness steel for forging and forming cold roller - Google Patents
High hardness steel for forging and forming cold roller Download PDFInfo
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Abstract
The invention discloses a high hardness steel for forging and forming cold rollers, and the chemical elements of the high hardness steel comprise, by mass, 0.80-1.0% of C, 0.50-1.0% of Si, 0.80-1.5% of Mn, 4.0-6.0% of Cr, 0.1-0.4% of Ni, not more than 0.020% of P, not more than 0.015% of S, 0.20-0.60% of M, 0.10-0.50% of V, 0.10-0.20% of Zr, and 0.10-0.40% of Be, with the balance being Fe and other unavoidable impurities. According to the invention, a high hardness steel for cold rollers with a hardness up to HS 97-99 is obtained by the solid-solution strengthening effect and the fine crystal strengthening effect of Be and Zr that are creatively added therein. The steel is quite suitable for the rolling of high-alloy and difficult-to-deform materials.
Description
Technical field
The present invention relates to a kind of alloy, the composition that relates in particular to a kind of ferrous alloy consists of.
Background technology
Cold roll is the indispensable parts on the metal cold rolling plant, is used for making metal to produce viscous deformation as a kind of speciality tool, rolls out various stocking products.The working conditions of roll is very complicated, can be subject to the effect of various cyclic stress in the military service, as crooked, reverse, shear, impact, the interactions such as friction and thermal stresses.The roll that runs up not only wants to bear normal height wearing and tearing stress and high repeated stress when rolling, and when rolling breaking down, also need bear local stress overload and thermal load and transship.Therefore cold roll should possess high hardenability, hardening capacity, wear resistance.
What generally use at present is that grade of steel is the forging and molding cold roll of MC 5, and its main chemical compositions is C:0.8～0.9%; Cr:4.5～5.5%; Ni:0.4～0.6%; Mo:0.2～0.4%; V:0.1～0.2%.Under the use state, the metallographic structure of roller surface layer is to be distributed with the M of disperse shape on the tempered martensite matrix
7C
3The type carbide is main, uses hardness to reach HS90～95.
Yet along with cold-rolled products to high strength and high-alloying future development, the more traditional carbon steel of the resistance to deformation of cold rolled sheet product in the operation of rolling of martensitic precipitation and superalloy is significantly improved, when deflection reaches 50%, superalloy Inconel718 deformation intensity is up to 1600MPa, martensitic precipitation deformation PH15-7Mo intensity is up to 1450MPa, deformation intensity is far above carbon steel, the MC5 cold roll can not be satisfied the demand, and therefore needs rolling such material of forging and molding cold roll of high rigidity.
Be CN1132262A at publication number, open day is on October 2nd, 1996, and name is called in the Chinese patent of " cold treatment-free forged steel in use for low alloyed deep hardened layer cold roller ", and disclosing chemical ingredients is C:0.75～1.05%; V:0.05～0.35%; Cr:0.75～1.35%; Mo:0.25～0.65%; Ca:0.003～0.012%; Al:0.55～3.00%; The cold rolling roll forging steel of Ce:0.005～0.03%.In this technical scheme, 0.55～3.00% Al content will cause Al in the steel
2O
3Non-metallic inclusion increases, and the purity of steel reduces, Al
2O
3Non-metallic inclusion longitudinally is chain and distributes in the forging deformation process, will reduce the transverse impact toughness of steel, the hardened layer hardness of roll is suitable with the MC5 that generally adopts at present in addition in this technical scheme, and hardness can not satisfy need of production during the materials such as rolling and high-temperature alloy, martensitic precipitation.
Summary of the invention
The purpose of this invention is to provide a kind of high rigidity steel for the manufacture of the forging and molding cold roll, use this cold roll can rolling high alloy, difficult-to-deformation material.
Technical conceive of the present invention overcomes the shortcoming of the high alloy material hardness deficiencies such as forging and molding cold roll rolling and high-temperature alloy and martensitic precipitation for by developing a kind of novel forging and molding cold roll high rigidity that contains micro alloying element steel.This kind steel is to strengthen matrix by precipitation strength effect and refined crystalline strengthening effect, the raising of realization hardness.Concrete principle is as follows:
The present invention has added microalloy element Be innovatively in steel, Be and Fe have formed displaced type sosoloid, strengthens matrix by solution strengthening effect, has formed intermetallic compound Be
2Fe, Be and C form alloy carbide Be
2C has significant precipitation strength effect.
Because Be forms ferritic element, so should increase the content of austenite former when adding the Be element, because Mn is the alloying element of strongly postponing perlitic transformation, is conducive to improve the hardening capacity of steel and improves intensity, so the weight percent of Mn/Be＞2 again.But because the Mn too high levels has the tendency that makes the crystalline grain of steel alligatoring, therefore Mn content is controlled at 0.80～1.5%.
The refined crystalline strengthening effect realizes by adding micro alloying element Zr, because Zr is carbide forming element, again strong deoxidation and denitrogenation element in steelmaking process, the austenite crystal of its energy refinement steel, can also be combined to the sulfuration zirconium with S, prevent the red brittleness of steel, Zr reduces the strain aging phenomenon of steel, the advantages such as low-temperature flexibility of raising steel in addition in addition.But too much Zr is difficult for fully being added in the austenite, can make to occur ZrC in the tissue, Zr not only can not increase the hardening capacity of steel like this, can fix because of it carbon of part on the contrary, cause the hardening capacity of steel to reduce, so the present invention control the content of Zr in 0.10～0.20% scope.
Except above-mentioned three kinds of chemical elements, also have following main component in this high rigidity steel grade:
The C element is to improve the most effectively element of the hardness of steel and intensity, and its solution strengthening effect is remarkable, be to guarantee that roll stell reaches required hardness and requisite element, but the C too high levels can cause increasing of carbide quantity in the steel, reduces toughness.
The Si element also has solution strengthening effect, and has preferably desoxydatoin, but the Si too high levels then can reduce the toughness of steel.
The vital role of Cr element is to improve hardening capacity and the wear resisting property of roll stell, but too high Cr content can cause eutectic carbides, thereby reduces machinability and the anti-accident ability of steel.Therefore the present invention is controlled at Cr content in 4.0～6.0% scopes.
Ni is the important element that improves hardening capacity, if but its content is excessive, then both increased cost, and may cause again the increase of retained austenite, thereby easily cause the generation of the tiny pit of rolling face.
The Mo element helps to improve wear resistance and temper resistance, but the Mo too high levels easily forms hard carbide Mo
2C and affect processing characteristics.
Add V element can form high rigidity in steel carbide VC, thereby improve the wear resistance of steel.
According to above-mentioned purpose of the present invention, a kind of glass hard steel for the forging and molding cold roll is proposed, its chemical element mass percent consists of: C 0.80～1.0%, Si 0.50～1.0%, and Mn 0.80～1.5%, and Cr 4.0～6.0%, Ni 0.1～0.4%, P≤0.020%, S≤0.015%, Mo 0.20～0.60%, V 0.10～0.50%, Zr 0.10～0.20%, and Be 0.10～0.40%, and surplus is Fe and other inevitable impurity.
The present invention makes it compared with prior art owing to adopted above technical scheme, has the following advantages and positively effect:
The present invention forms displaced type sosoloid with Fe, and then strengthens matrix by solution strengthening effect by adding innovatively the Be element, forms simultaneously intermetallic compound Be
2Fe produces significant precipitation strength effect.The present invention has also added the Zr element innovatively in addition, strengthens matrix by the refined crystalline strengthening effect, thereby has obtained high rigidity cold roll steel, and its hardness is up to HS97～99.Evidence the present invention had both improved the hardenability of cold roll with steel, had improved again the wear resistance of cold roll with steel.The present invention compares with steel MC5 with traditional cold roll, when precious metal element Ni consumption reduces, is but obtaining obvious optimization aspect the hardenability of steel, is fit to very much the material of rolling high alloy, difficult distortion.
Embodiment
Embodiment 1-6
Adopt vacuum induction furnace to become the ESR ingot of 100Kg with electroslag furnace melting raw materials for metallurgy, then be forged into Ф 80mm round steel, adopt 920～950 ℃ of insulation 1～2h after annealing, then oil cooling is to room temperature.The chemical ingredients mass percent composition of steel grade sees Table 1.The quenching hardness of embodiment 1-6 and comparative example finished product sees Table 2.
Chemical element component and the hardness thereof of table 1. embodiment of the invention 1-6 glass hard steel
The quenching hardness of table 2. embodiment of the invention 1-6 and comparative example steel grade MC5
| Quenching technology | Quenching hardness (HS) | |
| Embodiment 1 | 920 ℃ * 1h+ oil cooling is to room temperature | 97 |
| Embodiment 2 | 950 ℃ * 2h+ oil cooling is to room temperature | 98 |
| Embodiment 3 | 920 ℃ * 2h+ oil cooling is to room temperature | 98.5 |
| Embodiment 4 | 920 ℃ * 2h+ oil cooling is to room temperature | 99 |
| Embodiment 5 | 950 ℃ * 1h+ oil cooling is to room temperature | 97 |
| Embodiment 6 | 950 ℃ * 2h+ oil cooling is to room temperature | 98.5 |
| Comparative example MC5 | 950 ℃ * 2h+ oil cooling is to room temperature | 88 |
As can be seen from the above table, take Be and Zr as micro alloying element, solution strengthening, precipitation strength and refined crystalline strengthening effect are remarkable, compare with steel with the MC5 cold roll that generally adopts at present, glass hard steel among the present invention is only with oil quenchinng, hardness just can improve more than the 9HS, reaches HS97～99, and hardenability significantly improves.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (2)
1. glass hard steel that is used for the forging and molding cold roll is characterized in that its chemical element mass percent consists of:
And satisfy Mn/Be＞2; Surplus is Fe and other inevitable impurity.
2. the glass hard steel for the forging and molding cold roll as claimed in claim 1 is characterized in that, its chemical element mass percent consists of:
Surplus is Fe and other inevitable impurity.
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| CN 200910197482 CN102041454B (en) | 2009-10-21 | 2009-10-21 | High hardness steel for forging and forming cold roller |
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| CN 200910197482 CN102041454B (en) | 2009-10-21 | 2009-10-21 | High hardness steel for forging and forming cold roller |
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| CN102041454B true CN102041454B (en) | 2013-04-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102433515B (en) * | 2011-08-22 | 2013-11-06 | 中原特钢股份有限公司 | MC5 Steel and large-sized flattening roll prepared by using the same, and manufacturing process of MC5 steel |
| CN103643173A (en) * | 2013-11-12 | 2014-03-19 | 铜陵市肆得科技有限责任公司 | High temperature corrosion-resistant pump valve alloy steel material and preparation method thereof |
| CN103774053B (en) * | 2013-12-19 | 2015-11-25 | 马鞍山市方圆材料工程有限公司 | A kind of composite roll upper layer high hardness alloy steel and preparation method thereof |
| CN104099528B (en) * | 2014-07-08 | 2016-04-13 | 宁波市鄞州文昌金属制品有限公司 | A kind of special-shaped roll and preparation method thereof |
| CN107604264B (en) * | 2017-09-05 | 2021-11-30 | 宁波名古屋工业有限公司 | Engine cooling water pipe and preparation process thereof |
| CN107620013B (en) * | 2017-09-05 | 2021-11-30 | 宁波名古屋工业有限公司 | Air conditioner cooling water pipe and preparation process thereof |
| CN110205542A (en) * | 2019-05-22 | 2019-09-06 | 山东钢铁股份有限公司 | A kind of cold roll tool steel and preparation method thereof |
| CN114411034B (en) * | 2022-01-04 | 2022-06-21 | 郑州大学 | Steel bonded hard alloy and preparation method and application thereof |
| CN115838900A (en) * | 2022-11-30 | 2023-03-24 | 苏州灵固新材料科技有限公司 | Preparation method of heat-treatment-free high-strength cold heading line steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118381A (en) * | 1995-07-19 | 1996-03-13 | 冶金工业部钢铁研究总院 | High strength heat-resistance 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 |
| CN101481776A (en) * | 2009-02-13 | 2009-07-15 | 宝钢集团常州轧辊制造公司 | Cold rolling working roll with anti-rollar mark and high-wearing resistance and manufacturing method thereof |
-
2009
- 2009-10-21 CN CN 200910197482 patent/CN102041454B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118381A (en) * | 1995-07-19 | 1996-03-13 | 冶金工业部钢铁研究总院 | High strength heat-resistance 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 |
| CN101481776A (en) * | 2009-02-13 | 2009-07-15 | 宝钢集团常州轧辊制造公司 | Cold rolling working roll with anti-rollar mark and high-wearing resistance and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 潘光华.高硬度钢中铍硅钛镍钴和锰的原子吸收连续测定.《冶金分析》.1985,(第1期),第67页.. * |
| 潘光华.高硬度钢中铍硅钛镍钴和锰的原子吸收连续测定.《冶金分析》.1985,(第1期),第67页。. |
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Effective date of registration: 20200807 Address after: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Patentee after: Baowu Special Metallurgy Co.,Ltd. Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Patentee before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |