CN102994895A - Microalloyed high-strength high-toughness steel for geological drilling and production technology thereof - Google Patents
Microalloyed high-strength high-toughness steel for geological drilling and production technology thereof Download PDFInfo
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Abstract
The invention discloses microalloyed high-strength high-toughness steel for geological drilling and a production technology thereof. The steel comprises the following chemical components in percent by weight: 0.36-0.42% of C, 0.40-0.60% of Si, 1.45-1.70% of Mn, 0.20-0.30% of Cr, 0.10-0.20% of V, 0.010-0.030% of Al, 0.015-0.035% of Ti, less than or equal to 0.015% of S, less than or equal to 0.020 of P, less than or equal to 0.20% of Cu, and the rest of Fe. The production technology comprises the following steps of: smelting in an electric furnace; refining in an LF (Ladle Furnace); refining in a VD/RH furnace; continuously casting; and continuously rolling to obtain the microalloyed high-strength high-toughness steel for geological drilling. The steel has the high strength, high toughness and good wear resistance and is low in cost. The production technology can ensure the quality of steel products and increase the rolling yield and production efficiency and is low in production cost.
Description
Technical field
The present invention relates to the steel alloy in a kind of steel industry, specifically a kind of micro-alloying high tenacity geological drilling steel and production technique thereof.
Background technology
Geological drilling is harsh with the working conditions of steel, geological drilling uses steel in drilling process, bear huge turn round, pressure, curved, draw, the complicated repeated stress such as vibrations, so the comprehensive mechanical performance to him is had relatively high expectations, geological drilling with steel mainly for the production of drilling rod, drill collar, basket, sleeve pipe and sediment tube, grade of steel (steel grade) mainly contains: DZ40(50Mn), DZ50 (40Mn2), DZ55(40Mn2Mo), DZ60(45MnMoB), DZ65(27MnMoVB) etc.
Along with the continuous increase of diamond drilling technology at the successful Application aspect the deep prospecting and drilling depth, geological drilling is had higher requirement with intensity and the toughness of steel, in addition, along with the increase of carrying out the drilling operation ratio in complexity, ravelly ground, the geological drilling of the above high intensity levels of DZ55 is increasing with the steel demand at present.The above high grade of steel geology tube steel of traditional DZ55 adopts to add the Mo element and carry out quenching and tempering and improves intensity and toughness, need to carry out modifier treatment owing to increase valuable Mo element and steel in the steel, greatly increases the production cost of steel.
In order to adapt to geological drilling with the intensity of steel and the requirements at the higher level of toughness, require material not increasing the precious alloy element and in non-quality adjustment condition, improving as much as possible intensity and the toughness of material, thereby realize reducing the production cost that geological drilling is used steel.Therefore in the urgent need to developing the geological drilling steel of high strength, high tenacity.
Summary of the invention
The purpose of this invention is to provide a kind of micro-alloying high tenacity geological drilling with steel and production technique thereof, the intensity height of this steel, good toughness, wear resisting property are good, and cost is low.Production technique can guarantee steel product quality, can improve lumber recovery and production efficiency, and production cost is low.
The objective of the invention is to be achieved through the following technical solutions:
A kind of micro-alloying high tenacity geological drilling steel, it is characterized in that: the chemical ingredients of this steel is by weight percentage: C 0.36-0.42%, Si 0.40-0.60%, Mn 1.45-1.70%, Cr 0.20-0.30%, V 0.10-0.20%, AL 0.010-0.030%, and Ti 0.015-0.035%, S≤0.015%, P≤0.020%, Cu≤0.20%, remaining is Fe.
Among the present invention, described chemical ingredients is (wt%) more preferably: C 0.37-0.41%, Si 0.45-0.55%, Mn 1.50-1.60%, Cr 0.22-0.28%, V 0.12-0.18%, AL 0.015-0.025%, and Ti 0.020-0.030%, S≤0.010%, P≤0.015%, Cu≤0.10%, remaining is Fe.
A kind of micro-alloying high tenacity geological drilling is characterized in that with the production technique of steel this production technique comprises the following steps:
1) electrosmelting adds molten iron and steel scrap, realizes taking off in advance P and composition initial adjustment; Obtain following composition, be by weight percentage: C 0.20-0.30%, Si 0.08-0.16%, Mn 1.30-1.50%, Cr≤0.20%, V≤0.10%, AL 0.008-0.030%, Ti≤0.030%, S≤0.025%, P≤0.015%, Cu≤0.10%, remaining is Fe;
2) LF refining: in the LF stove, take off S, take off O and trimming; Obtain following composition, be (complementary element scope) by weight percentage: C 0.37-0.41%, Si 0.45-0.55%, Mn 1.50-1.60%, Cr 0.22-0.28%, V 0.12-0.18%, AL 0.015-0.025%, and Ti 0.020-0.030%, S≤0.010%, P≤0.015%, Cu≤0.10%, remaining is Fe;
3) VD/RH refining: vacuum outgas and trimming in the VD/RH stove, obtain following composition, be by weight percentage: C 0.37-0.41%, Si 0.45-0.55%, Mn 1.50-1.60%, Cr 0.22-0.28%, V 0.12-0.18%, AL 0.015-0.025%, Ti 0.020-0.030%, S≤0.010%, P≤0.015%, Cu≤0.10%, remaining is Fe;
4) continuous casting: water orthogonal continuously cast bloom at continuous caster;
5) tandem rolling: through the tandem rolling unit, be rolled into round steel, obtain micro-alloying, high tenacity geological drilling steel; The mechanical property of this steel hot rolling as-normalized condition is: tensile strength R
m=760-900MPa, yield strength R
El=550-700MPa, elongation A
10=12-15%, low-temperature impact work (Aku ,-20 ℃)=50-60J.
The below specifies the restriction reason of steel chemical composition of the present invention.
C: can significantly improve the intensity of steel, but the plasticity of steel is worsened, C is one of brittle transition temperature element that significantly improves steel.If C content is lower than 0.36%, the As rolled intensity of material and mechanical performance index all do not reach the service requirements of setting.If C content is higher than 0.42%, the toughness of material is relatively poor, and low-temperature impact work does not reach requirement.So the C scope is defined as 0.36-0.42%.
Si: in steel, can dissolve in ferrite, can improve intensity and the hardness of steel alloy, reduce plasticity and the toughness of steel.Its minimum content is 0.15% just can be effective, but too high Si content, during particularly with Mn, the coexistence of Cr element, cause easily the grain coarsening of steel, but Si is the element that significantly improves the yield strength of steel, the general requirement of compound material, and this steel grade is defined as 0.40-0.60% with Si content.
Mn: in steel, can dissolve in ferrite, strengthen matrix, can refine pearlite during cooling after rolling and can relatively improve content of pearlite in alloy, therefore, can improve intensity and hardness, and less on the plasticity impact of material.When Mn content was lower than 1.00%, the mechanical property of material was difficult to reach high grade of steel geological drilling with the requirement of strength of steel, so Mn content is defined as 1.45-1.70%.
Cr: the intensity that can significantly improve steel, simultaneously can improve the anticorrosive and wear resistance of steel, will be affected if be higher than the plasticity index of 0.30% material, too high Cr can form oxide inclusion simultaneously, reduce the impelling strength of steel, so Cr content is defined as 0.20-0.30%.
V: vanadium main role in steel is thinning microstructure crystal grain, improves the grain coarsening temperature, thereby reduces the superheated susceptivity of steel, and improve intensity and the toughness of steel; Increase temper resistance, and produce the secondary hardening effect.Vanadium also improves plasticity and the toughness of steel except beyond the intensity, particularly yield-point and yield tensile ratio that improve steel.Because the refinement of material grains, the grain size number of material improves greatly after the refinement, and the proportion of crystal boundary strengthens, the strength increase of steel, and material reduces greatly to the susceptibility of crackle.Consider the composite request of material, determine that V content is V 0.10-0.20%.Especially the strengthening effect of V content does not need can stablize realization by controlled rolling and controlled cooling, and consumption is few simultaneously, and cost is low.
Ti: be one of chemically very active metallic element, it and nitrogen, oxygen, carbon have extremely strong avidity, therefore utilize it to fix nitrogen in the steel.Simultaneously, Ti element and carbon form a kind of carbide TiC, and this carbide bonding force is extremely strong, and stabilizer pole is difficult for decomposing; In steel, only be heated to more than 1000 ℃, could dissolve in lentamente in the sosoloid (α or γ phase).Before not dissolving in, the titanium carbide particulate has the grow up effect of alligatoring of crystalline grain of steel that stops.Therefore, come crystal grain thinning with Ti, the grain coarsening temperature of this steel is brought up to more than 1000 ℃, both avoided the crack sensitivity of this steel, improved again the comprehensive mechanical property of material.When Ti is lower than 0.015%, do not have fixedly N in the steel, and the effect of crystal grain thinning, the too high easy formation TiN Mechanism of Formation of The Globular Inclusions of Ti, impelling strength and the fatigue lifetime of reducing material are so the Ti scope is defined as 0.015-0.035%.Ti element consumption is few, and cost is low.
Residual element P, S etc. facts have proved that P, S cause embrittlement of grain boundaries in the intergranular segregation, can cause material at high temperature temper brittleness, when P, S surpass certain content simultaneously, a lot of to the brittle transition temperature raising of steel, cause material at low temperature impelling strength low, worsen the comprehensive mechanical property of steel.
Geological drilling steel according to the present invention produces has high strength, high tenacity, wear resisting property and crack-resistance sensitivity.The performance of material hot rolling as-normalized condition is as follows: tensile strength R
m=760-900MPa, yield strength R
El=550-700MPa, elongation A
10=12-15%, low-temperature impact work (Aku ,-20 ℃)=50-60J.
The present invention compared with prior art has the following advantages:
1, adopt electric furnace hot charging 90% molten iron smelting, molten steel is through LF refining, VD vacuum outgas, makes that steel is even, cleanliness factor is high.
2, adopt the mode of microalloying, need not to add the precious alloy elements Mo in the steel, material can reach the requirement of high strength, high tenacity under the hot rolling as-normalized condition, greatly reduce the production cost of steel.
3, the heating process that adopts hot charging, heat to send greatly reduces the usage quantity of fuel, thereby greatly reduces production cost.
Embodiment
Embodiment 1
Adopt following production technique preparation:
1) electrosmelting is smelted in 90 tons of electric furnaces, adds molten iron and steel scrap, realizes taking off in advance P and composition initial adjustment; Obtain following composition, be by weight percentage: C 0.22%, and Si 0.15%, and Mn 1.45%, and Cr 0.10%, and V 0.05%, and Ni 0.02%, and Al 0.020%, and Ti 0.010%, and S 0.025%, and P 0.013%, and Cu 0.04%, and remaining is Fe
2) LF refining is taken off S and trimming in 100 tons of LF stoves; Obtain following composition, be by weight percentage: C 0.40%, and Si 0.47%, and Mn 1.55%, and Cr 0.25%, and V 0.13%, and Ni 0.02%, and Al 0.022%, and Ti 0.022%, and S 0.002%, and P 0.014%, and Cu 0.04%, and remaining is Fe.
3) VD vacuum oven, vacuum outgas and trimming in 100 tons of VD stoves; Obtain following composition, be by weight percentage: C 0.40%, and Si 0.47%, and Mn 1.55%, and Cr 0.25%, and V 0.13%, and Ni 0.02%, and Al 0.022%, and Ti 0.022%, and S 0.002%, and P 0.014%, and Cu 0.04%, and remaining is Fe.
4) continuous casting adopts 5 machines, the 5 stream caster machines of the R10m that Italian Danieli Off Mecc produces, waters into the continuous cast rectangle billet of 220*260mm;
5) tandem rolling adopts 13 continuous mills to be rolled into the geological drilling steel of dimension.
Resulting micro-alloying, high tenacity geological drilling steel, the chemical ingredients of steel is as follows:
C 0.40%, and Si 0.47%, and Mn 1.55%, and Cr 0.25%, and V 0.13%, and Ni 0.02%, and Al 0.022%, and Ti 0.022%, and S 0.002%, and P 0.013%, and Cu 0.04%, and remaining is Fe.
Geological drilling is ∮ 65mm with the steel steel, and the performance of steel is as follows:
A, B, C class non-metallic inclusion are 0 grade, and the D class slightly is 0 grade, and the D class carefully is 0.5 grade; Oxygen level is 12.0ppm.
Tensile strength R
m=870MPa, yield strength R
El=600MPa, elongation A
10=14%, low-temperature impact work (Aku ,-20 ℃) 58J.
Embodiment 2
Another micro-alloying high tenacity geological drilling steel, the chemical ingredients of steel is as follows: C 0.39%, and Si 0.46%, and Mn 1.58%, and Cr 0.23%, V 0.13%, and Ni 0.02%, and Al 0.022%, and Ti 0.020%, S 0.002%, and P 0.011%, and Cu 0.04%, and remaining is Fe.
Production technique is with embodiment 1.
The wear-resistant ball steel are ∮ 70mm, and the performance of steel is as follows:
A, B, C class non-metallic inclusion are 0 grade, and the D class slightly is 0 grade, and the D class carefully is 0.5 grade; Oxygen level is 11.0ppm.
Tensile strength R
m=860MPa, yield strength R
El=590MPa, elongation A
10=15%, low-temperature impact work (Aku ,-20 ℃) 58J.
Embodiment 3
Another micro-alloying high tenacity geological drilling steel, the chemical ingredients of steel is as follows: C 0.41%, and Si 0.50%, and Mn 1.56%, and Cr 0.24%, V 0.13%, and Ni 0.02%, and Al 0.023%, and Ti 0.025%, S 0.002%, and P 0.013%, and Cu 0.04%, and remaining is Fe.
Geological drilling is ∮ 80mm with the steel steel, and the performance of steel is as follows:
A, B, C class non-metallic inclusion are 0 grade, and the D class slightly is 0 grade, and the D class carefully is 0.5 grade; Oxygen level is 10.0ppm.
Tensile strength R
m=870MPa, yield strength R
El=610MPa, elongation A
10=14%, low-temperature impact work (Aku ,-20 ℃) 55J.
Geological drilling of the present invention manufactures geology exploitation drilling rod with steel through the pipe mill, and the drilling rod performance satisfies the requirement of DZ55 grade of steel in YB/T 5052 standards fully, and part drilling rod performance reaches the requirement of DZ60 grade of steel.
Claims (3)
1. micro-alloying high tenacity geological drilling steel, it is characterized in that: the chemical ingredients of this steel is by weight percentage: C 0.36-0.42%, Si 0.40-0.60%, Mn 1.45-1.70%, Cr 0.20-0.30%, V 0.10-0.20%, AL 0.010-0.030%, and Ti 0.015-0.035%, S≤0.015%, P≤0.020%, Cu≤0.20%, remaining is Fe.
2. micro-alloying high tenacity geological drilling steel according to claim 1, it is characterized in that: the chemical ingredients of this steel is by weight percentage: C 0.36-0.42%, Si 0.40-0.60%, Mn 1.45-1.70%, Cr 0.20-0.30%, V 0.10-0.20%, AL 0.010-0.030%, and Ti 0.015-0.035%, S≤0.015%, P≤0.020%, Cu≤0.20%, remaining is Fe.
3. the production technique of a micro-alloying high tenacity geological drilling usefulness steel claimed in claim 1 is characterized in that this production technique comprises the following steps:
1) electrosmelting adds molten iron and steel scrap, realizes taking off in advance P and composition initial adjustment; Obtain following composition, be by weight percentage: C 0.20-0.30%, Si 0.08-0.16%, Mn 1.30-1.50%, Cr≤0.20%, V≤0.10%, AL 0.008-0.030%, Ti≤0.030%, S≤0.025%, P≤0.015%, Cu≤0.10%, remaining is Fe;
2) LF refining: in the LF stove, take off S, take off O and trimming; Obtain following composition, be by weight percentage:
C 0.37-0.41%, Si 0.45-0.55%, Mn 1.50-1.60%, Cr 0.22-0.28%, V 0.12-0.18%, AL 0.015-0.025%, and Ti 0.020-0.030%, S≤0.010%, P≤0.015%, Cu≤0.10%, remaining is Fe;
3) VD/RH refining: vacuum outgas and trimming in the VD/RH stove, obtain following composition, be by weight percentage: C 0.37-0.41%, Si 0.45-0.55%, Mn 1.50-1.60%, Cr 0.22-0.28%, V 0.12-0.18%, AL 0.015-0.025%, Ti 0.020-0.030%, S≤0.010%, P≤0.015%, Cu≤0.10%, remaining is Fe;
4) continuous casting: water orthogonal continuously cast bloom at continuous caster;
5) tandem rolling: through the tandem rolling unit, be rolled into round steel, obtain micro-alloying high tenacity geological drilling steel; The mechanical property of this steel hot rolling as-normalized condition is: tensile strength R
m=760-900MPa, yield strength R
El=550-700MPa, elongation A
10=12-15%, low-temperature impact work (Aku ,-20 ℃)=50-60J.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950968A (en) * | 2016-07-11 | 2016-09-21 | 吴用镜 | High-hardness and high-strength alloy steel for drilling rod |
| CN106011694A (en) * | 2016-07-11 | 2016-10-12 | 曾冰冰 | Molybdenum-rhodium-based alloy steel material and application of molybdenum-rhodium-based alloy steel material in drilling drill stem |
| CN112011668A (en) * | 2020-08-30 | 2020-12-01 | 中南大学 | Production process for improving desulfurization efficiency in EAF-LF molten steel refining process |
| CN112553542A (en) * | 2020-12-08 | 2021-03-26 | 首钢集团有限公司 | Vanadium microalloyed hollow steel for rock drilling and preparation method thereof |
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| GB2246579A (en) * | 1990-08-03 | 1992-02-05 | Samsung Heavy Ind | High toughness non-refined steels and method for manufacturing them |
| CN101948986A (en) * | 2010-09-26 | 2011-01-19 | 南京钢铁股份有限公司 | High-quality alloy steel bar and production process thereof |
| CN102703816A (en) * | 2012-06-29 | 2012-10-03 | 中天钢铁集团有限公司 | High-carbon low-alloy wear-resistant ball steel and production process thereof |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2246579A (en) * | 1990-08-03 | 1992-02-05 | Samsung Heavy Ind | High toughness non-refined steels and method for manufacturing them |
| CN101948986A (en) * | 2010-09-26 | 2011-01-19 | 南京钢铁股份有限公司 | High-quality alloy steel bar and production process thereof |
| CN102703816A (en) * | 2012-06-29 | 2012-10-03 | 中天钢铁集团有限公司 | High-carbon low-alloy wear-resistant ball steel and production process thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950968A (en) * | 2016-07-11 | 2016-09-21 | 吴用镜 | High-hardness and high-strength alloy steel for drilling rod |
| CN106011694A (en) * | 2016-07-11 | 2016-10-12 | 曾冰冰 | Molybdenum-rhodium-based alloy steel material and application of molybdenum-rhodium-based alloy steel material in drilling drill stem |
| CN112011668A (en) * | 2020-08-30 | 2020-12-01 | 中南大学 | Production process for improving desulfurization efficiency in EAF-LF molten steel refining process |
| CN112011668B (en) * | 2020-08-30 | 2021-11-12 | 中南大学 | Production process for improving desulfurization efficiency in EAF-LF molten steel refining process |
| CN112553542A (en) * | 2020-12-08 | 2021-03-26 | 首钢集团有限公司 | Vanadium microalloyed hollow steel for rock drilling and preparation method thereof |
| CN112553542B (en) * | 2020-12-08 | 2022-02-18 | 首钢集团有限公司 | Vanadium microalloyed hollow steel for rock drilling and preparation method thereof |
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Application publication date: 20130327 |