WO2007029515A1 - 使用中の硬さ変化が少ない高靭性耐摩耗鋼およびその製造方法 - Google Patents
使用中の硬さ変化が少ない高靭性耐摩耗鋼およびその製造方法 Download PDFInfo
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- WO2007029515A1 WO2007029515A1 PCT/JP2006/316657 JP2006316657W WO2007029515A1 WO 2007029515 A1 WO2007029515 A1 WO 2007029515A1 JP 2006316657 W JP2006316657 W JP 2006316657W WO 2007029515 A1 WO2007029515 A1 WO 2007029515A1
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- Prior art keywords
- hardness
- steel
- toughness
- resistant steel
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Definitions
- High toughness wear resistant steel with less change in hardness during use and manufacturing method thereof
- the present invention is a wear-resistant steel having a hardness of HB400 or more and a hardness of HB520 or less, which is required for construction machines, industrial machines, etc., with little change in hardness during use, and excellent toughness, It relates to the method. Background art
- wear-resistant steels are required to have stable wear-resistant properties for a long time and to be able to withstand long-term use.
- the conventional invention has improved the delayed crack resistance, the thermal crack resistance, and the low temperature toughness assumed to be used at a low temperature. Things are disclosed.
- a technique for reducing Mn may be further hardened 200-500 after quenching.
- a technique for example, JP-A-63-317623
- JP-A-63-317623 has been reported which applies a tempering treatment method at a low temperature of ° C.
- a manufacturing technology see, for example, Japanese Patent Laid-Open No. Hei 1-172514
- a limited composition such as Mn, Cr, Mo etc.
- there is a technique of limiting the component system mainly on the alloy element see, for example, JP 2001-49387 A, JP 2005-179783 A, JP 2004-10996 A). It is disclosed.
- wear-resistant steels are used in various wear environments, but even in environments that are generally used at room temperature, the wear surface is frictional heat due to the material used from room temperature to about 100 ° C, and over a long time It is known to be exposed.
- the characteristics of the wear-resistant steel at temperatures slightly higher than room temperature, such as the change in hardness have hardly been investigated, and the present invention has demonstrated that the present invention has been in use for a long time in such an environment. It is an object of the present invention to provide a high toughness wear resistant steel with less change in hardness and a method of manufacturing the same.
- the present invention has been made in order to provide a technique necessary for maintaining long-term stable hardness in wear resistant steel, and the gist of the present invention is
- a high toughness wear-resistant steel having a small change in hardness during use characterized in that it has a component in which the M value defined is M: —10 to 16.
- V 0.01 to 0 ⁇ 1%
- Nb 0.005 to 0 ⁇ 05%
- Ti 0.005 to 0.03%
- Ca 0.0005 to 0.05%
- Mg 0.0005 to 0.05%
- R EM A high toughness wear resistant steel with little change in hardness during use according to the above (1), characterized in that it contains one or more of 0.001 to 0.1%.
- a steel having the chemical composition according to the above (1) or (2) is hot-rolled and then quenched from a temperature of 3 or more Ac points.
- the present invention in wear resistant steels generally used at room temperature, has found a range of components for preventing a change in hardness during long-term use and an M value serving as an index of alloy design, thereby achieving wear life. Enables provision of steel plates that can be dramatically improved. Brief description of the drawings
- Figure 1 shows the effect of alloying elements on the change in hardness after holding at 150 ° C for 10 hours.
- FIG. 2 shows the effect of alloying elements on Charpy absorption energy at ⁇ 20 ° C. after holding at 150 ° C. for 10 hours.
- Si It is effective as a deoxidizing material and an element that suppresses hardness reduction during use, and a remarkable effect is observed when it is added at 0.30% or more. However, if it is added at more than 1.00%, toughness may be inhibited. , 1.00% or less is the upper limit.
- Mn An element effective mainly for improving hardenability and 0.32% or more is required, but it has a function to lower the hardness to promote the formation of cementite plate at low temperature in martensite, and a large amount of addition is As this is not preferable, the range is set to 0.32% or more and 0.70% or less.
- Mo Improves hardenability, and at the same time, suppresses changes in hardness during long-term holding, so addition of 0.1% or more is necessary, but if it exceeds 1.0%, toughness may be impaired.
- the upper limit is set to 1.0%.
- A1 Added to steel as a deoxidizing element, but it needs 0.01% or more The addition of more than 0.1% tends to inhibit the toughness, so the upper limit is made 0.1%.
- N A large amount of N added to the steel sheet lowers the toughness, so the lower the content, the lower the content is preferably 0.01% or less.
- V, Nb and Ti are further elements as elements for improving the hardness and toughness of the base material, and from the object of further improving the ductility and toughness.
- One or more of Ca, Mg and REM can be added.
- V An element that improves the hardenability and contributes to the improvement of hardness. Addition of 0.01% or more is required, but addition of excessive amount impairs toughness, so the upper limit is made 0.1%.
- Nb, Ti An element that can improve toughness by refining the crystal grains of the base material, and all effects can be obtained by adding 0.005%, but significant addition can result in the formation of coarse precipitates such as carbonitrides.
- the amount of Nb added should be 0.005 to 0.05% and Ti: 0.005 to 0.03%, since the toughness may be impaired through the above.
- Ca, Mg, REM All of these elements are effective as an element for preventing the reduction in ductility due to the expansion of sulfide during hot rolling, and Ca and Mg are each 0.0005% or more, REM is Although the effect is exhibited by the addition of 0.001% or more, the excessive addition may generate coarse oxides at the same time as the coarsening of sulfides, at the same time when it is produced. Therefore, the range of addition is as follows: Ca: 0.0005 to 0.05%, Mg: 0.0005 to 0 ⁇ 05%, REM: 0.001 to 0.1%.
- Fig. 1 shows a steel containing 0.23 to 0.26% C-0.20 to 0.80% Si-0.35 to 1.23% Mn-0.45 to 1% Cr-0.2 to 0.5% Mo-0 to 105% V to 25 mm thickness
- the difference between the hardness of the hardened material after rolling and the hardness after holding it at 150 ° C for 10 hours is taken as the vertical axis, and the horizontal axis is plotted as the M value calculated from the amount of alloy elements. is there .
- Holding for 10 hours at 150 ° C. corresponds to an accelerated test when held at a temperature of about room temperature to about 100 ° C. for a long time.
- the change in hardness ( ⁇ ⁇ ) depends on the value of ⁇ value, and when ⁇ value exceeds ⁇ 10, ⁇ ⁇ becomes 7 or less, and it can be seen that almost no decrease in hardness is observed .
- FIG. 2 shows the Charbi absorption energy value at _ 20 ° C. at that time on the vertical axis. As apparent from this figure, when the M value exceeds 16, a tendency is observed that the toughness decreases.
- the inventors considered that they can provide a manufacturing technology of a wear resistant steel having characteristics of less change in hardness and good toughness, as shown in FIG. 1 and FIG.
- the range of the range is from 1 to 16 because of the change in hardness when held for a long time near room temperature and the influence of the M value on the toughness value.
- the steel according to the present invention can be suitably used particularly for a bucket of a power shovel, a member for a vessel of a dump truck or a member for a vessel of a dump truck, and when applied to these members, the hardness during long term use does not decrease.
- the wear of parts can be significantly reduced over a long period, and the service life can be improved by 1.4 times or more.
- a billet having the above component system is used as a starting material , Heating ⁇ Rolling process, manufactured through heat treatment.
- Steel billets are manufactured as steel billets by processes such as continuous casting and ingot formation and agglomeration after the components are adjusted and melted in a converter or an electric furnace.
- the heating temperature of the billet, the condition of rolling, and the condition at the time of quenching may be any conditions generally used in general.
- direct hardening may be performed immediately after heating and rolling the billet.
- the billet heating temperature is 1000 ° C or more and 1250 ° C or less, and if the finishing temperature during hot rolling is 850 ° C or more, there is no problem in the characteristics after direct hardening.
- the restriction on the heating temperature of the billet is that if it becomes less than 1000 ° C, solutionizing of the contained alloying elements does not proceed and there is a concern that the hardness will decrease, and if the temperature exceeds 1270 ° C, heating This condition is used because there is a concern that the old austenite grains may become coarse and the toughness may decrease.
- the limitation of finishing temperature at the time of hot rolling is provided to secure the temperature at the time of direct hardening which is subsequently carried out, and when the rolling finishing temperature is less than 850 ° C.
- a temperature of 850 ° C or higher is taken as the lower limit of the finishing temperature because there is a concern that the hardness of the steel will decrease.
- Table 1 shows the chemical composition of the test steel manufactured as an example of the present invention.
- Each of the test steels is manufactured as a steel material by the ingot-slab method or the continuous structural method, and in the table, in the steels A to I, those having the chemical components within the scope of the present invention, J ⁇ P 'steel is manufactured out of the chemical composition range of the present invention.
- Each piece of steel shown in Table 1 was heated under the production conditions shown in Table 2 And after hot rolling, some of them were heat-treated to produce steel plates having a thickness of up to 25 to 50 mm. After that, Brinell hardness measurement of 0.5 mm immediately below the surface layer was carried out. Furthermore, a part of the steel plate is cut out, heat treatment is applied at 150 ° C. for 10 hours, HB of the 0.5 mm portion below the surface of the steel plate is measured, and a thickness of 1/4 t part to a Charpy test piece The samples were taken (longitudinal direction of rolling) and the test was carried out at Table 2 also shows their results.
- Steel 10 to Steel 18 are cases where either one of the chemical composition or the steel sheet manufacturing condition deviates from the scope of the present invention.
- the chemical components are outside the scope of the present invention. That is, in the steel 10 and the steel 11, the amount of C deviates from the scope of the present invention. As a result, in the case of steel 11, although the C content is deviated lower than the present invention range of 0.19%, the hardness of the base material is reduced to HB382. On the other hand, in the case of steel 11, conversely, the C content is deviated high, and the hardness of the base material is remarkably increased as SHB 563, and the toughness is also low.
- Steel 12 is an example where the amount of Si added deviates high from the range of the present invention. In this case, the toughness is lowered as a result of the increase in the hardness of the base material.
- Steel 13 is an example in which the addition amount of Mn is out of the range of the present invention. As a result, at the same time when the change in hardness ⁇ is slightly large at around 15, the toughness is also low.
- Steels 14 and 15 have Cr and Mo amounts which are out of the range of the present invention. In this case, although the change in hardness ⁇ is small, the toughness is remarkable. Low.
- Steel 16 is the case where the M value is out of the range of the present invention. In this case, although the toughness is good, the change in hardness ⁇ HB is extremely large at 31.
- Steels 17 and 18 are produced at conditions outside the scope of the present invention in the component range and production conditions. That is, steels 17 and 18 have a component system in which the amount of Mn deviates high, and when the hardening temperature after rolling is heated below the Ac 3 transformation point, steel 18 is subjected directly to the hardening process.
- the rolling finish temperature is lower than the range of the present invention of 850 ° C. or higher. In all cases, the hardness of the base material is HB400 or less, and it does not have the desired hardness.
- the present invention makes it possible to significantly reduce the change in hardness during use which is extremely important for the properties of wear resistant steels, and the industrial use effect is extremely large.
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06796763A EP1930459A4 (en) | 2005-09-09 | 2006-08-18 | HIGH-TECH WEAR-RESISTANT STEEL WITH LOW HARD CHANGE IN USE AND METHOD OF MANUFACTURING THEREOF |
CN2006800329559A CN101258257B (zh) | 2005-09-09 | 2006-08-18 | 使用中的硬度变化小的高韧性耐磨耗钢及其制造方法 |
US11/991,592 US8097099B2 (en) | 2005-09-09 | 2006-08-18 | High toughness abrasion resistant steel with little change in hardness during use and method of production of same |
BRPI0615885-4A BRPI0615885B1 (pt) | 2005-09-09 | 2006-08-18 | Aço e método de produção de chapa de aço |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005-262297 | 2005-09-09 | ||
JP2005262297A JP4846308B2 (ja) | 2005-09-09 | 2005-09-09 | 使用中の硬さ変化が少ない高靭性耐摩耗鋼およびその製造方法 |
Publications (1)
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WO2007029515A1 true WO2007029515A1 (ja) | 2007-03-15 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/316657 WO2007029515A1 (ja) | 2005-09-09 | 2006-08-18 | 使用中の硬さ変化が少ない高靭性耐摩耗鋼およびその製造方法 |
Country Status (7)
Country | Link |
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US (1) | US8097099B2 (ja) |
EP (1) | EP1930459A4 (ja) |
JP (1) | JP4846308B2 (ja) |
KR (1) | KR20080034987A (ja) |
CN (1) | CN101258257B (ja) |
BR (1) | BRPI0615885B1 (ja) |
WO (1) | WO2007029515A1 (ja) |
Cited By (2)
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JP2012122087A (ja) * | 2010-12-06 | 2012-06-28 | Nippon Steel Corp | 細粒鉄源運搬部材及びこれを用いたベッセル等 |
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- 2005-09-09 JP JP2005262297A patent/JP4846308B2/ja active Active
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2006
- 2006-08-18 KR KR1020087005588A patent/KR20080034987A/ko active Search and Examination
- 2006-08-18 CN CN2006800329559A patent/CN101258257B/zh active Active
- 2006-08-18 EP EP06796763A patent/EP1930459A4/en not_active Withdrawn
- 2006-08-18 US US11/991,592 patent/US8097099B2/en not_active Expired - Fee Related
- 2006-08-18 BR BRPI0615885-4A patent/BRPI0615885B1/pt active IP Right Grant
- 2006-08-18 WO PCT/JP2006/316657 patent/WO2007029515A1/ja active Application Filing
Patent Citations (4)
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JPS6059019A (ja) * | 1983-09-13 | 1985-04-05 | Sumitomo Metal Ind Ltd | 耐遅れ破壊性の優れた耐摩耗性鋼板の製造法 |
JPH01149921A (ja) * | 1987-12-04 | 1989-06-13 | Kawasaki Steel Corp | 耐遅れ割れ性の優れた直接焼入れ型高強度鋼の製造方法 |
JPH01172514A (ja) * | 1987-12-25 | 1989-07-07 | Nippon Steel Corp | 耐熱亀裂性に優れた高硬度高靭性耐摩耗鋼の製造法 |
JPH09118950A (ja) * | 1995-10-24 | 1997-05-06 | Nippon Steel Corp | 厚手高硬度高靱性耐摩耗鋼およびその製造方法 |
Non-Patent Citations (1)
Title |
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See also references of EP1930459A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012122087A (ja) * | 2010-12-06 | 2012-06-28 | Nippon Steel Corp | 細粒鉄源運搬部材及びこれを用いたベッセル等 |
CN109609839A (zh) * | 2018-11-16 | 2019-04-12 | 邯郸钢铁集团有限责任公司 | 高延伸性能的低合金高强耐磨钢nm450及其生产方法 |
Also Published As
Publication number | Publication date |
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BRPI0615885A2 (pt) | 2011-05-31 |
KR20080034987A (ko) | 2008-04-22 |
CN101258257A (zh) | 2008-09-03 |
EP1930459A4 (en) | 2012-01-11 |
BRPI0615885B1 (pt) | 2015-08-04 |
CN101258257B (zh) | 2011-01-19 |
JP4846308B2 (ja) | 2011-12-28 |
US8097099B2 (en) | 2012-01-17 |
JP2007070713A (ja) | 2007-03-22 |
US20100059150A1 (en) | 2010-03-11 |
EP1930459A1 (en) | 2008-06-11 |
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