CN101624675B - 45BM steel for caterpillar track pin roll and manufacturing method thereof - Google Patents
45BM steel for caterpillar track pin roll and manufacturing method thereof Download PDFInfo
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- CN101624675B CN101624675B CN2009100174337A CN200910017433A CN101624675B CN 101624675 B CN101624675 B CN 101624675B CN 2009100174337 A CN2009100174337 A CN 2009100174337A CN 200910017433 A CN200910017433 A CN 200910017433A CN 101624675 B CN101624675 B CN 101624675B
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Abstract
The invention discloses a 45BM steel for a caterpillar track pin roll, comprising the components by weight percent: 0.43-0.47% of C, 0.17-0.35% of Si, 0.60-0.80% of Mn, 0.005-0.025% of P, 0.001-0.020% of S, 0.01-0.20% of Cr, 0.01-0.20% of Ni, 0.01-0.20% of Cu, 0.0005-0.0030% of B, 0.020-0.060% of Ti, 0.01-0.06% of Al and the rest of Fe and unavoidable impurities. A manufacturing method of the 45BM steel comprises: electric furnace smelting, steel tapping, LF external refining and vacuum degassing (VD) treatment. The reduced molten steel is added with aluminium for finally deoxidization, titanium for nitrogen fixation and ferroboron for alloying after the VD treatment; casting blank is poured by continuous casting; the superheat temperature is 20-30 DEG C, the continuous casting speed is 0.9-1.20m/min, the uniform heating temperature of billet steel in a heating furnace is 1180-1220 DEG C, the heating time is 2.5-3h, the initial rolling temperature is 1100-1150 DEG C, and the final rolling temperature is 850-1000 DEG C. The steel and the manufacturing method thereof have superior technical effects.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of 45 BM steel for caterpillar track pin roll and manufacture method thereof.
Background technology
45BM belongs to boron steel, is called economic quenched and tempered steel, is to be basic replaced C r with manganese, boron, a kind of structural low of Ni steel.Add trace B in the steel and can significantly improve hardening capacity, save a large amount of noble elements, also can obtain good mechanical property simultaneously.China Cr, Ni resource scarcity, and boron aboundresources.Therefore, the development boron steel is significant.Usually medium carbon steel or medium carbon alloy steel are adopted in product design, by reaching the mechanical performance index of design requirements after the modifier treatment.Obtain finally to use the metallographic structure of attitude to organize as tempered sorbite.This tempered sorbite tissue has intensity and plasticity, flexible good combination.Boron is one of extremely active element, can close the stable inclusion of formation with residual nitrogen, oxidation and lose its useful effect in steel, and only the boron that is present in the steel with the solid solution form just can play useful effect.The B element can improve the hardening capacity and the fatigue resistance of steel.Recent two decades comes, and unusual effect progressively promoted the use of and obtained to boron in engineering machinery in steel alloy, low alloy steel field as micro alloying element.
Summary of the invention
The present invention is primarily aimed at caterpillar chain rail bearing pin working conditions, invents a kind of high strength boron-containing steel and preparation method thereof, has mainly solved the optimizing components design of steel, improves mechanical property.Boron-containing steel of the present invention has high-hardenability, high-strong toughness, excellent combination property, belongs to structural alloy steel.
45 BM steel for caterpillar track pin roll, it forms by weight that percentage ratio is:
C：0.43～0.47％ Ti：0.020～0.060％
Si：0.17～0.35％ Cr：0.01～0.20％
Mn：0.60～0.80％ Cu：0.01～0.20％
B：0.0005～0.0030％ Ni：0.01～0.20％
P：0.005～0.025％ Al：0.010～0.060％
S：0.001～0.020％ O：5×10
-6～20×10
-6
Surplus is Fe and unavoidable impurities.
One of innovation point of the present invention is the optimization design of composition.
Ti does not consider as alloying element in boron steel, is mainly used in fixed nitrogen, is brought into play with the hardening capacity that guarantees boron.Be control ω (Bsol), add the element that strong avidity is arranged with oxygen usually, as Al, Ti etc., ω (Alsol) 0.06～0.08% can effectively control ω (Bsol) in the control steel, but considers the operability of continuous casting process, and it is more feasible to add titanium fixed nitrogen.Al content is low in addition, and Ti can not fully combine with nitrogen, can not play the effect of protection ω (Bsol).Therefore, design B:0.0008～0.0020%, Ti:0.020～0.045%, Al:0.015～0.050%.
Preferably, 45 BM steel for caterpillar track pin roll, it forms by weight that percentage ratio is:
C：0.44～0.46％ Ti：0.020～0.045％
Si：0.25～0.30％ Cr：0.01～0.20％
Mn：0.70～0.80％ Cu：0.01～0.20％
B：0.0008～0.0020％ Ni：0.01～0.20％
P：0.005～0.025％ Al：0.015～0.050％
S：0.001～0.020％ O：5×10
-6～20×10
-6
Surplus is Fe and unavoidable impurities
One of innovative point of the present invention is rational alloying technology, and purpose is the content that guarantees effective boron in the steel.
Boron in the steel (B is complete) can be represented by the formula:
B is complete=and B is solid+B (Fe
3(CB))+B (Fe
23(CB)
6)+B (BN)+B (BOx)
In the formula, B is solid solution boron, B (Fe admittedly
3(CB))+B (Fe
23(CB)
6) be sour molten boron, B (BN) and B (BOx) they are sour insoluble boron.The generation of the insoluble boron of acid since when making steel deoxidation and fixed nitrogen deficiency cause, unhelpful to the hardening capacity of steel, be invalid boron again.When electrosmelting is produced the manganese boron steel,, in steel, can close the stable inclusion of formation and lose its useful effect, B element and N with residual nitrogen, oxidation because of boron is one of extremely active element
2, O
2The standard free energy of element reaction changes and sees Table 1, as can be seen from Table 1, add in the refining furnace steelmaking system at electric furnace, the B element can with N
2, O
2Element reaction generates compound, therefore for guaranteeing the content of sour molten boron in the steel, should reduce the N in the steel as far as possible
2, O
2Constituent content.
Table 1B element and N2, the standard free energy of O2 element reaction
Δ G
θ=A+BT, A, B are constants.
In the steel-making temperature range, the direct oxidation standard free energy (Δ F °) that is dissolved in iron liquid interior element is seen Fig. 1.As can be seen from Figure 1, in the temperature range of steel-making, the oxidation capacity of B element is only second to aluminium and titanium elements; The standard Gibbs energy figure that nitrogen and each metallic element form nitride sees Fig. 2, and as seen from the figure, titanium, aluminium, boron and nitrogen can form stable nitride.Their stability increases with decrease of temperature; And AlN, TiN are more stable than BN.
Therefore for guaranteeing the content of " effectively boron " in the steel, should reasonably arrange the add-on and the order of various alloy materials, adopt in the molten steel after reduction, add the aluminium final deoxygenation, add the titanium fixed nitrogen, VD adds the ferro-boron metallization processes after taking off vacuum-treat.
The preparation method of 45 BM steel for caterpillar track pin roll, under the satisfactory situation of chemical ingredients that guarantees steel, carry out following steps:
(1) smelting and alloying---electrosmelting, tapping, the LF external refining, the VD vacuum outgas is handled; In the molten steel after reduction, add the aluminium final deoxygenation successively, add the titanium fixed nitrogen, VD adds ferro-boronization after taking off vacuum-treat, guarantees that chemical ingredients adheres to specification,
(2) cast---adopt the continuous casting strand, control continuous casting tundish superheating temperature is 20～30 ℃, the control pouring speed, and the continuous casting casting speed is 0.90～1.20m/min, guarantees slab quality,
(3) rolling---steel billet is 1180～1220 ℃ in the soaking temperature of process furnace, and be 2.5～3h heat-up time, 1100～1150 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures.
Compared with prior art, technical scheme of the present invention has a following advantage:
(1) steel of the present invention is effectively controlled effective boron content in the steel by optimization design Al-Ti-B trace element composition, controls narrow hardening capacity, improves Heat Treatment Of Steel characteristic and mechanical property.
(2) in addition, by optimizing alloying technology, improve recovery rate and effective boron component of boron and accurately control.By effective alloying technology, the fluctuation of B content is controlled at 3ppm in the actual steel, and the recovery rate of B element is in 65%～75% scope, and technology controlling and process is more stable.
Description of drawings
Fig. 1 is the Δ F that is dissolved in the direct oxidation of iron liquid interior element
0Wherein X-coordinate is a temperature, unit K; Ordinate zou is a standard Gibbs free energy, the J of unit
Fig. 2 is the Δ G of nitride
θ-T figure Δ G
θ=RTlnpN
2, J/molN
2Wherein X-coordinate is a temperature, unit K; Ordinate zou is a standard Gibbs free energy, the J of unit.
Embodiment
Specify technical scheme of the present invention below in conjunction with embodiment, but be not limited thereto.
45 BM steel for caterpillar track pin roll of the present invention is to adopt UHP (surpassing the power electric furnace)+LF (external refining) technology to smelt the continuous casting strand-heating-rolling explained hereafter steel of becoming a useful person.Embodiment is that the production technique with Φ 50mm specification steel specifies the present invention and how to implement.
The production craft step of 45 BM steel for caterpillar track pin roll is:
(1) smelting and alloying---electrosmelting, tapping, the LF external refining, the VD vacuum outgas is handled.In the molten steel of employing after reduction, add the aluminium final deoxygenation, add the titanium fixed nitrogen, VD adds the ferro-boron metallization processes after taking off vacuum-treat, guarantees that chemical ingredients adheres to specification,
(2) cast---adopt the continuous casting strand, control continuous casting tundish superheating temperature is 20～30 ℃, the control pouring speed, and the continuous casting casting speed is 0.90～1.20m/min, guarantees slab quality,
(3) rolling---steel billet is 1180～1220 ℃ in the soaking temperature of process furnace, and be 2.5～3h heat-up time, 1100～1150 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures.
Concrete parameter sees Table 1 and table 2.Table 1 is an embodiment 45 BM steel for caterpillar track pin roll chemical ingredients, and table 2 is continuous casting tundish superheating temperature, casting speed, billet heating temperature, time and texturing temperature.
Table 1: 45 BM steel for caterpillar track pin roll embodiment chemical ingredients (weight, %)
| Embodiment | C | Si | Mn | Cr | P | S | Ni | Cu | B | Ti | Al | Fe |
| 1 | 0.45 | 0.21 | 0.72 | 0.02 | 0.009 | 0.002 | 0.01 | 0.02 | 0.0017 | 0.039 | 0.036 | |
| 2 | 0.43 | 0.24 | 0.70 | 0.04 | 0.012 | 0.001 | 0.02 | 0.06 | 0.0015 | 0.035 | 0.030 | Surplus |
| 3 | 0.45 | 0.26 | 0.73 | 0.05 | 0.011 | 0.003 | 0.02 | 0.06 | 0.0017 | 0.0040 | 0.035 | Surplus |
Table 2: continuous casting tundish superheating temperature, casting speed, billet heating temperature, time and texturing temperature
| Embodiment | Continuous casting tundish superheating temperature, ℃ | The continuous casting casting speed, mm/min | The steel billet soaking temperature, ℃ | Soaking time, h | Start rolling temperature, ℃ | Finishing temperature, ℃ |
| 1 | 25 | 1.10 | 1210 | 2.8 | 1120 | 950 |
| 2 | 28 | 1.07 | 1200 | 2.9 | 1100 | 980 |
| 3 | 23 | 1.15 | 1190 | 3.0 | 1140 | 960 |
In table 3, testing method adopts international method to this kind steel through the relevant performance data rows of measuring.
Table 3: the physical property of steel
Claims (2)
1. 45 BM steel for caterpillar track pin roll is characterized in that, forming by weight, percentage ratio is:
C：0.44～0.46％ Ti：0.020～0.045％
Si：0.25～0.30％ Cr：0.01～0.20％
Mn：0.70～0.80％ Cu：0.01～0.20％
B：0.0008～0.0020％ Ni：0.01～0.20％
P：0.005～0.025％ Al：0.015～0.050％
S：0.001～0.020％ O：5×10
-6～20×10
-6
Surplus is Fe and unavoidable impurities.
2. the preparation method of 45 BM steel for caterpillar track pin roll comprises smelting and alloying, cast, rolling technology, it is characterized in that, the composition weight percent of control steel is:
C：0.44～0.46％ Ti：0.020～0.045％
Si：0.25～0.30％ Cr：0.01～0.20％
Mn：0.70～0.80％ Cu：0.01～0.20％
B：0.0008～0.0020％ Ni：0.01～0.20％
P：0.005～0.025％ Al：0.015～0.050％
S：0.001～0.020％ O：5×10
-6～20×10
-6
Surplus is Fe and unavoidable impurities;
It is characterized in that described smelting and alloying, cast, rolling technology are:
(1) smelting and alloying---electrosmelting, tapping, the LF external refining, the VD vacuum outgas is handled; In the molten steel after reduction, add the aluminium final deoxygenation, add the titanium fixed nitrogen, VD adds the ferro-boron metallization processes after taking off vacuum-treat, guarantees that chemical ingredients adheres to specification,
(2) cast---adopt the continuous casting strand, control continuous casting tundish superheating temperature is 20～30 ℃, the control pouring speed, and the continuous casting casting speed is 0.90～1.20m/min, guarantees slab quality,
(3) rolling---steel billet is 1180～1220 ℃ in the soaking temperature of process furnace, and be 2.5～3h heat-up time, 1100～1150 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures.
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| CN101805874B (en) * | 2010-03-30 | 2011-09-07 | 莱芜钢铁集团有限公司 | Low-carbon Mn-Cr steel for engine camshaft and manufacturing method thereof |
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| WO2013037116A1 (en) * | 2011-09-15 | 2013-03-21 | 长沙中联重工科技发展股份有限公司 | Alloy steel for casting crawler plate, crawler plate and manufacturing method thereof and engineering machinery |
| CN102605266B (en) * | 2012-03-13 | 2014-03-05 | 莱芜钢铁集团有限公司 | Steel for caterpillar type engineering machinery caterpillar link pin bushes and production method thereof |
| CN103447492A (en) * | 2012-05-30 | 2013-12-18 | 通化钢铁股份有限公司 | Production process for eliminating boron micro-alloying hot-rolled steel strip edge faults |
| CN102909533B (en) * | 2012-11-27 | 2014-09-17 | 宋佳骏 | Blank preparation process for shafts |
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| CN109112253B (en) * | 2018-09-06 | 2021-07-06 | 邯郸钢铁集团有限责任公司 | Steel for crawler pin shaft with Cr and B elements for improving hardenability and production method thereof |
| CN110373514A (en) * | 2019-08-30 | 2019-10-25 | 马鞍山钢铁股份有限公司 | A kind of stable method for improving boron recovery rate in steel |
| CN113084113B (en) * | 2021-03-08 | 2022-06-14 | 山东钢铁股份有限公司 | Different steel type mixed casting method suitable for slab caster |
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