CN102534432A - Method for manufacturing and tempering bainite wear-resistant steel and steel pipe - Google Patents
Method for manufacturing and tempering bainite wear-resistant steel and steel pipe Download PDFInfo
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- CN102534432A CN102534432A CN2012100051235A CN201210005123A CN102534432A CN 102534432 A CN102534432 A CN 102534432A CN 2012100051235 A CN2012100051235 A CN 2012100051235A CN 201210005123 A CN201210005123 A CN 201210005123A CN 102534432 A CN102534432 A CN 102534432A
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Abstract
The invention provides a method for manufacturing and tempering bainite wear-resistant steel and steel pipe. The bainite wear-resistant steel contains the following main ingredients of: C, Mn, Si, Cr, Ni, Cu, V, Al, P, S and the balance of Fe. The method for manufacturing the bainite wear-resistant steel pipe comprises the following steps of: alloying the raw material ingredients of bainite wear-resistant steel to form an alloy, refining the alloy by using a refining furnace, forming a pipe blank by using continuous casting, then, heating up the pipe blank, carrying out heat insulation to homogenize, then, perforating, carrying out tandem rolling, and sizing; carrying out pipe-making by using on-line rolling, then, carrying out air cooling or accelerated cooling; and after air cooling or accelerated cooling, carrying out tempering and heat insulation for 1-48 hours at the tempering temperature of 180-380 DEG C. Compared with the prior art, the method has the advantages that: the occurrence of mixed-metal texture is avoided, the recrystallization is fully guaranteed after the alloy is homogenized, two difficult problems in composite pipes internationally and domestically are solved, and a pipeline formed by directly adopting the bainite wear-resistant steel pipe is pressure-proof and wear-resistant.
Description
Technical field
The invention belongs to the Steel Alloy field, the method for manufacture and the wear-resistant steel pipe that are specifically related to a kind of wear resisting steel and a kind of wear-resistant steel pipe are made tempering method.
Background technology
Wear-resistant steel pipe is widely applied to industries such as electric power, metallurgy, mine, coal in order to transportation sandstone, coal dust, grindability granule materials such as lime-ash; Its Working environment requires wear-resistant steel pipe to have high firmness, H.T. to obtain good abrasion resistance.But generally speaking, toughness worsens along with the raising of hardness.Carry industry generally to adopt compound pipeline complex pipeline at international and domestic slurry, slurry body generally is that the gentle power of doing of water drives the material transportation, and material is not of uniform size, requires pipeline necessary wear-resisting and withstand voltage.Common Q 235 steel pipes are made overcoat the inside lining one deck high-abrasive material, and outer layer pipe is used for pressure-bearing connecting tube length and is used for wear-resisting apart from the inside one deck.Therefore at present; The general inwall hardened method that adopts is made wear-resistant steel pipe; For example one Chinese patent application number is the patent of invention file of CN92109663.1 etc. for the utility model patent file of CN92231096.3 and number of patent application, but this method complex process, and cost is higher.
Middle low Carbon Manganese series air-cooled bainitic steels (ZL031500927, CN03124268.5) said middle low Carbon Manganese series air-cooled bainitic steels has higher air cooled hardenability, and air cooling hardness is greater than HRC45, and the non-notch impact value is greater than 70J/cm
2Can be applied to the wear-resistant steel pipe field, but the present manufacturing technology of unexposed wear-resistant steel pipe still.
Summary of the invention
Given this, first purpose of the present invention is to provide a kind of alloy material of withstand voltage, wear-resisting and erosion resistance high comprehensive performance.
For solving the problems of the technologies described above, the present invention provides a kind of Bainite wear-resisting steel, and this steel moity is C:0.20 ~ 0.45wt%; Mn:1.5 ~ 3.5wt%, Si:0.5 ~ 2.0wt%, Cr:0.6 ~ 1.8wt%; Ni:0 ~ 0.8wt%, Cu:0 ~ 0.5wt%, V:0～0.1wt%; Al:0.001 ~ 0.1wt%P:0～0.3wt%, S:0～0.3wt%, surplus is Fe;
One or more that on above composition basis, add following trace element can play booster action:
Ti:0.01 ~ 1 weight %, N; 0.001 ~ 0.1 weight %, B:0.001 ~ 0.1 weight %, Re:0.001 ~ 1 weight %, Ca:0.001 ~ 0.1 weight %, Mo:0.1 ~ 1 weight %, Nb:0.001 ~ 0.1 weight %.
Compared with prior art, Bei Shi wear-resistant steel pipe cost according to the invention is lower, according to the content of the concrete service condition control each component of wear resisting steel, to satisfy the composite request to wear resistance, resistance to pressure and the erosion resistance of material.
Another object of the present invention is to provide a kind of method of manufacture of wear-resistant steel pipe.
For solving the problems of the technologies described above, the present invention provides a kind of wear-resistant bainite manufacture of steel pipe, with Bainite wear-resisting steel feed composition alloying; Through the refining furnace refining; Continuous casting becomes pipe, and the online steel pipe that rolls into has obtained bainite and martensite heterogeneous structure after air cooling or the acceleration cooling; Eliminate stress stabilizing tissue through low-temperaturetempering again.
Preferably, after continuous casting becomes the circle base, will justify base after 1100 ~ 1300 ℃ of insulation homogenizing, at 1150 ~ 900 ℃ of perforation tandem rollings, at 850 ~ 950 ℃ of sizings; After the cooling, carried out tempering 1 ~ 48 hour at 180 ~ 380 ℃.
Preferably, the direct cold bed that gets in rolling back carries out air cooling.
Preferably, take to quicken the refrigerative mode, speed of cooling is 0.1 ℃/s ~ 9 ℃/s.
Another object of the present invention is a kind of Bainite wear-resisting steel pipe manufacturer tempering method.
For solving the problems of the technologies described above, the present invention carries a kind of Bainite wear-resisting steel pipe manufacturer tempering method, after air cooling or the acceleration cooling, 180 ~ 380 ℃ of following tempering insulations of tempering temperature 1 ~ 48 hour.Obtain obtaining tube material performance hardness HRC35-60; Impelling strength v-notch J/cm20-200; Tensile strength 1000-2500MPa, ys 800-1600MPa, carbon equivalent Ce (%)≤0.5-0.9; Ce (%)=C+Mn/6+Cr+V/5+Ni+Cu/15, obtaining microtexture is bainite and martensite complex tissue.
Research shows that mixed grain structure has adverse influence to the impelling strength of steel, for the impelling strength that guarantees that it is higher, need avoid the appearance of mixed grain structure.The method of the invention has been avoided the appearance of mixed payment organization, has fully guaranteed recrystallize after the alloy homogenizing.To the temperature controlling of manufacturing and tempering link, eliminate unrelieved stress effectively, improve the stability of residual austenite, improve its toughness, make product keep higher hardness value.The invention solves 2 layers of difficult problem of international and domestic compound pipeline complex pipeline, directly adopt the wear-resistant bainite pipeline not only withstand voltage but also wear-resisting.
Description of drawings
Fig. 1 bainite type wear resisting steel unstability figure, dependent variable 0.2.
Fig. 2 bainite type wear resisting steel unstability figure, dependent variable 0.3.
Fig. 3 bainite type wear resisting steel unstability figure, dependent variable 0.6.
Fig. 4 bainite type wear resisting steel unstability figure, dependent variable 0.7.
Embodiment
Cost of alloy is lower, and (Ce%) is lower for carbon equivalent.Carbon helps improving the wear resisting property of wear-resistant steel pipe, but unfavorable to toughness; Manganese is to improve one of effective elements of bainite hardening capacity because its solute pulls and a type drag interaction, and is simultaneously with low cost, thus the application with manganese as main alloy element; Silicon and manganese interact and can promote pulling with class of manganese to pull effect, promote the formation of bainite, but it are unfavorable to welding property.Ni and Cu can improve the corrosion resistance nature of wear-resistant steel pipe, yet the inefficacy of wear-resistant steel pipe is the result of wear-resistant material wearing and tearing and the anti-corrosion wear effect of vying each other, and according to its service condition, selects the content of each element.
The multinomial submeter that is implemented as of embodiment 1 wear-resistant bainite steel pipe:
| Numbering | C | Mn | Si | Cr | Ai | Ni | V | Cu |
| No. 1 | 0.2-0.3 | 1.8-2.1 | 0.6-0.9 | 0.6-0.9 | 0.03-0.08 | 0.2-0.6 | 0.05-0.1 | 0.1-0.3 |
The multinomial submeter that is implemented as of embodiment 2 wear-resistant bainite steel pipes:
| Numbering | C | Mn | Si | Cr | mo | Ni | V | Cu |
| No. 1 | 0.2-0.3 | 1.8-2.1 | 0.6-0.9 | 0.6-0.9 | 0.3-0. 8 | 0.2-0.6 | 0.05-0.1 | 0.1-0.3 |
The multinomial submeter that is implemented as of embodiment 3 wear-resistant bainite steel pipes:
| Numbering | C | Mn | Si | Cr | Ai | Ni | V | Cu |
| No. 2 | 0.2-0.4 | 2.2-2.5 | 1.0-1.6 | 1.0-1.6 | 0.03-0.08 | 0.2-0.6 | 0.05-0.1 | 0.1-0.3 |
The multinomial submeter that is implemented as of embodiment 4 wear-resistant bainite steel pipes:
| Numbering | C | Mn | Si | Cr | mo | Ni | V | Cu |
| No. 2 | 0.2-0.4 | 2.2-2.5 | 1.0-1.6 | 1.0-1.6 | 0. 3-0. 8 | 0.2-0.6 | 0.05-0.1 | 0.1-0.3 |
The multinomial submeter that is implemented as of embodiment 5 wear-resistant bainite steel pipes:
| Numbering | C | Mn | Si | Cr | Ai | V |
| No. 3 | 0.2-0.4 | 1.8-3.5 | 0.6-1.8 | 0.6-1.8 | 0.03-0.08 | 0.05-0.1 |
The multinomial submeter that is implemented as of embodiment 6 wear-resistant bainite steel pipes:
| Numbering | C | Mn | Si | Cr | mo | Ni |
| No. 3 | 0.2-0.4 | 1.8-3.5 | 0.6-1.8 | 0.6-1.8 | 0. 3-0. 8 | 0.2-0.9 |
Below in conjunction with Fig. 1 to Fig. 4 the present invention is explained.Mixed grain structure has adverse influence to the impelling strength of steel, for the impelling strength that guarantees that it is higher, need avoid the appearance of mixed grain structure.Therefore the applicant has set up the working diagram of invention steel through gleeble-1500D.Consider the temp effect that returns in the operation of rolling simultaneously, each rolling intensification is about 100 ℃.Can know that according to working diagram perforation shaping and deformation amount is bigger, with reference to figure 3 and Fig. 4, is 1100 ~ 1300 ℃ in temperature, strain rate is 0.001 ~ 4s
-1The zone in, complete dynamic recrystallization can take place, strain stress is less, helps the moulding of boring a hole.And deflection is less in continuous rolling process, with reference to figure 1 and Fig. 2, is 1000 ~ 1200 ℃ in temperature, and strain rate is 0.001 ~ 10s
-1The zone in, can realize complete dynamic recrystallization.Select 900 ~ 1100 ℃ of tandem rollings, consider simultaneously and return temp effect, also can guarantee the realization of perfect recrystallization.In the finish to gauge stage, deflection and strain rate are less, with reference to figure 1 and Fig. 2, are 900 ~ 1000 ℃ in temperature, and strain rate is 0.001 ~ 0.1s
-1The zone in all can guarantee perfect recrystallization.
The confirming of low tempering temperatures needs steel pipe to keep higher hardness value as prerequisite, will eliminate unrelieved stress simultaneously, also will improve the stability of residual austenite, improves its toughness.
The selection of tempering temperature determines according to performance requirement.According to different performance requirements, select the low-temperaturetempering of differing temps, the tempering of this temperature has not only reduced transformation stress, has increased the stability of residual austenite simultaneously.Research is illustrated in tempering between 180 ~ 380 ℃, and the stability of residual austenite increases.This helps improving the impelling strength of wear resisting steel.Tempering temperature sees the following form to the influence of residual austenite mechanical stability (MS) and thermostability (TS):
| Tempering temperature/℃ | Mechanical stability/% | Thermostability/% |
| 220 | 94.5625 | 63.5625 |
| 280 | 83.5625 | 96.8125 |
| 340 | 84.875 | 99.0625 |
| 360 | 68.375 | 99.375 |
| 380 | 66.4375 | 67.125 |
The product availability hardness HRC35-60 that aforesaid method is made, impelling strength v-notch 20-200, the strong 1000-2500MPa of tension, ys 800-1600MPa, carbon equivalent (%)≤0.5-0.9.The pipe steel that Ce%=C+Mn/6+Cr+V/5+Ni+Cu/15 obtains bainite and martensite complex tissue has obtained good combination of strength and toughness and wear-resisting, corrosive nature, and possesses superior weldability.
Claims (3)
1. a Bainite wear-resisting steel is characterized in that, composition of steel is C:0.20 ~ 0.45wt%, Mn:1.5 ~ 3.5wt%, Si:0.5 ~ 2.0wt%, Cr:0.6 ~ 1.8wt%, Ni:0 ~ 0.8wt%, Cu:0 ~ 0.5wt%, V:0 ~ 0.1wt%; Al:0.001 ~ 0.1wt%, P:0 ~ 0.3wt%, S:0 ~ 0.3wt%, surplus is Fe;
One or more that on above composition basis, add following trace element can play booster action:
Ti:0.01 ~ 1 weight %, N; 0.001 ~ 0.1 weight %, B:0.001 ~ 0.1 weight %, Re:0.001 ~ 1 weight %, Ca:0.001 ~ 0.1 weight %, Mo:0.1 ~ 1 weight %, Nb:0.001 ~ 0.1 weight %.
2. a wear-resistant bainite steel pipe rolling method is characterized in that, with Bainite wear-resisting steel feed composition alloying; Through the refining furnace refining, continuous casting becomes pipe, after pipe is warmed up to 1100 ~ 1300 ℃ of insulation homogenizing again; At 900 ~ 1150 ℃ of perforation tandem rollings, at 850 ~ 950 ℃ of sizings; Air cooling or acceleration cooling behind the on-line rolling tubulation.
3. a Bainite wear-resisting steel pipe manufacturer tempering method is characterized in that, after air cooling or the acceleration cooling; 180 ~ 380 ℃ of following tempering insulations of tempering temperature 1 ~ 48 hour, obtain obtaining tube material performance hardness HRC35-60, impelling strength v-notch J/cm20-200; Tensile strength 1000-2500MPa, ys 800-1600MPa, carbon equivalent Ce (%)≤0.5-0.9; Ce (%)=C+Mn/6+Cr+V/5+Ni+Cu/15, obtaining microtexture is bainite and martensite complex tissue.
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Application publication date: 20120704 |