CN103614631B - Containing the preparation method of rare earth production perforation gun tube body - Google Patents
Containing the preparation method of rare earth production perforation gun tube body Download PDFInfo
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- CN103614631B CN103614631B CN201310641736.2A CN201310641736A CN103614631B CN 103614631 B CN103614631 B CN 103614631B CN 201310641736 A CN201310641736 A CN 201310641736A CN 103614631 B CN103614631 B CN 103614631B
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Abstract
The invention discloses a kind of preparation method containing rare earth production perforation gun tube body, comprising: the rolling of STEELMAKING PRODUCTION, steel, roll state steel heat treatment and aligning.The present invention is low containing oxygen smelting steel technology by adopting, add rare earth element when Oxygen Content in Liquid Steel is low, prevent rare earth oxidized, avoid generating harmful rare earth and be mingled with, increase metamorphism and the Microalloying Effect of steel rare earth elements, make steel also have high tenacity while high-strength.
Description
Technical field
The present invention relates to metal material field, specifically, relate to a kind of preparation method containing rare earth production perforation gun tube body.
Background technology
Perforation is the main completion mode of oil and gas wells in oil fields, plays an important role in petroleum exploration & development, and the object of perforation links up the fluid channel between well and stratum, ensures that Oil/gas Well obtains due production capacity.And production perforation gun tube body is as the material of main part of perforating gun, the enormous impact ripple that gunpowder explosion produces is subject in perforating process, requirement perforation casing not only intensity will meet the demands, and also requires high toughness coupling, does not burst to make perforating gun in perforation job.And to be gone bad and alloying action can improve the toughness of steel greatly at steel grade by rare earth element, but rare earth element is very easily oxidized, in smelting process, therefore need hypoxia condition to ensure that rare earth plays its effect.So, having very important significance containing rare earth perforation casing of exploitation low oxygen content.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method containing rare earth production perforation gun tube body, can prepare have high tenacity containing rare earth production perforation gun tube body.
Technical solution of the present invention is as follows:
Containing the preparation method of rare earth production perforation gun tube body, comprising: the rolling of STEELMAKING PRODUCTION, steel, roll state steel heat treatment and aligning, the rolling of described steel comprises: the heating of circle base, perforation, tube rolling and tension reducing; The temperature of described round base heating is 1250 ~ 1300 DEG C, and the temperature of described perforation is 1230 ~ 1260 DEG C, and the start rolling temperature of described tube rolling is 1150 ~ 1220 DEG C, temperature >=890 DEG C of finish to gauge; The described state steel heat treatment that rolls comprised Quench and temper, and the temperature of described quenching is 890 ± 10 DEG C, 890 ± 10 DEG C of insulations 70 ~ 80 minutes; The temperature of described tempering was 630 ± 10 DEG C, 630 ± 10 DEG C of insulations 80 ~ 90 minutes; Temperature >=480 DEG C of described aligning; The mass percentage producing the chemical composition of the material containing rare earth production perforation gun tube body obtained comprises: C 0.25% ~ 0.30%, Si 0.20% ~ 0.35%, Mn 1.0% ~ 1.20%, P≤0.020%, S≤0.010%, Cr 0.80% ~ 1.05%, Mo 0.15% ~ 0.25%, Al 0.015% ~ 0.04% and rare earth La 0.01% ~ 0.03%, all the other are Fe and impurity, and massfraction amounts to 100%.
Further, described STEELMAKING PRODUCTION comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting; Described converter smelting adopts single slag melting technique, and finishing slag basicity controls 3.0, mass percentage >=0.06% of the carbon of converter terminal; Described LF refining time >=40min, temperature >=1500 DEG C in place of described LF refining, temperature >=1650 DEG C of offing normal of described LF refining; When described LF refining is offed normal, in molten steel, the mass percentage of Al is mass percentage≤0.010% of 0.015% ~ 0.035%, S, and described LF refining terminates rear every 100 tons of molten steel feeding 150m rare-earth wires; Vacuum tightness≤the 0.1KPa of described VD vacuum outgas, adopt bottom blowing argon gas, after described VD vacuum outgas soft blow time >=15min; Described round billet continuous casting adopts the constant pulling rate of 1.4 ~ 1.6m/min.
Further, the mass percentage of the described chemical composition containing rare earth production perforation gun tube body prepared comprises: C 0.25%, Si 0.22%, Mn 1.0%, Cr 0.80%, Al 0.015%, P 0.02%, S 0.010%, Mo 0.15% and La 0.01%; Or, C 0.27%, Si 0.27%, Mn 1.10%, Cr 0.90%, Al 0.03%, P 0.010%, S 0.008%, Mo 0.21% and La 0.015%; Or, C 0.28%, Si 0.29%, Mn 1.12%, Cr 0.95%, Al 0.035%, P 0.013%, S 0.007%, Mo 0.23% and La 0.020%; Or, C 0.29%, Si 0.30%, Mn 1.15%, Cr 1.0%, Al 0.037%, P 0.013%, S 0.006%, Mo 0.20% and La 0.025%; Or, C 0.30%, Si 0.35%, Mn 1.20%, Cr 1.05%, Al 0.04%, P 0.02%, S 0.010%, Mo 0.25% and La 0.03%.
Technique effect of the present invention is as follows:
Of the present invention low containing oxygen smelting steel technology by adopting containing rare earth production perforation gun tube body material, rare earth element is added when Oxygen Content in Liquid Steel is low, prevent rare earth oxidized, avoid generating harmful rare earth to be mingled with, increase metamorphism and the Microalloying Effect of steel rare earth elements, make steel also have high tenacity while high-strength.
Embodiment
The concrete steps of the preparation method containing rare earth production perforation gun tube body of the present invention are as follows:
Step S1: STEELMAKING PRODUCTION
STEELMAKING PRODUCTION comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting.
Molten iron is obtained: C 0.25% ~ 0.30%, Si 0.20% ~ 0.35%, Mn1.0% ~ 1.20%, P≤0.020%, S≤0.010%, Cr 0.80% ~ 1.05%, Mo 0.15% ~ 0.25%, Al 0.015% ~ 0.04% and La 0.01% ~ 0.03% according to following proportion ingredient, all the other are Fe and impurity, and massfraction amounts to 100%.Then by hot metal pretreatment, pre-desulfurization is carried out to molten iron.
Converter smelting adopts desulphurised hot metal, and silicomanganese, ferromanganese and ferrochrome deoxidation alloying, smelted by converter; Adopt single slag melting technique, finishing slag basicity controls 3.0; Mass percentage >=0.06% of the carbon of converter terminal, to reduce the activity of oxygen in steel.
In LF refining, composition is finely tuned, the mass percentage of aluminium in molten steel of being offed normal by LF controls between 0.015% ~ 0.035%, the rising of oxygen content in steel can be prevented, adopt and count to the mode that senior number improves heat-up rate gradually heat temperature raising from rudimentary, carry out slag making desulfurization, trimming according to converter molten steel composition and temperature.The time of LF refining will ensure >=40min, to ensure that LF offs normal mass percentage≤0.010% of S in molten steel, temperature >=1500 DEG C in place of LF refining, in order to avoid refining long increase cost heat-up time, temperature >=1650 DEG C of offing normal of LF refining, LF refining whole process adopts normal Argon.By every 100 tons of molten steel feeding 150m rare-earth wires after LF refining terminates, now oxygen level is low, can ensure that feeding rare-earth wires plays its rotten and Microalloying Effect to greatest extent.
Vacuum tightness≤the 0.1KPa of VD vacuum outgas, adopts bottom blowing argon gas pattern, soft blow time maintenance >=15min after VD vacuum.
Round billet continuous casting process adopts whole process protection cast; be specially: ladle adopts long nozzle to tundish; and carry out blowing argon gas protection; tundish adopts the intrusive mood mouth of a river to crystallizer; covering agent and crystallizer protecting residue during tundish and crystallizer adopt respectively; reduce the secondary oxidation of casting process, will baking of tundish be strengthened simultaneously, prevent molten steel air-breathing.Adopt constant casting speed control technique, speed control is at 1.4 ~ 1.6m/min.
Step S2: the rolling of steel
The rolling of steel mainly comprises: the heating of circle base, perforation, tube rolling and tension reducing, and detailed process is: circle base → sawing → circle base heating → perforation → tube rolling → tension reducing → sampling → cooling → crop end → align → check → pack → weigh → warehouse-in.The heating of circle base should ensure that circle base homogeneous heating controls grain fineness number size and prevents decarburization again, and the temperature of circle base heating is 1250 ~ 1300 DEG C.The temperature of its circle base perforation is 1230 ~ 1260 DEG C, and when can ensure to bore a hole, pipe has good deformability.The start rolling temperature of tube rolling is 1150 ~ 1220 DEG C, and this steel at this temperature plasticity is best, and during rolling, resistance to deformation is little, effectively can ensure the quality of hollow forging surfaces externally and internally.Ensure finishing temperature >=890 DEG C, the high steel pipe that is equivalent to of finishing temperature carries out a normalizing, can crystal grain thinning, eliminates stress, and alleviating banded structure for finished heat treatment provides suitable structural state.
Step S3: roll state steel heat treatment
Roll state steel heat treatment and comprise Quench and temper.The temperature of quenching is 890 ± 10 DEG C, and 890 ± 10 DEG C of insulations 70 ~ 80 minutes, this temperature can ensure steel pipe homogeneous heating and alloying element is dissolved in austenite entirely, can not make coarse grains again.The temperature of tempering is 630 ± 10 DEG C, and 630 ± 10 DEG C of insulations 80 ~ 90 minutes, the tempered sorbite obtained by high tempering can make material have good comprehensive mechanical property.
Step S4: aligning
Ensure that straightening temperature >=480 DEG C crack to avoid steel pipe to produce larger stress.
The mass percentage containing rare earth perforation casing material chemical composition produced through said process is: C 0.25% ~ 0.30%, Si 0.20% ~ 0.35%, Mn 1.0% ~ 1.20%, P≤0.020%, S≤0.010%, Cr 0.80% ~ 1.05%, Mo 0.15% ~ 0.25%, Al 0.015% ~ 0.04% and rare earth La 0.01% ~ 0.03%, all the other are Fe and impurity, and massfraction amounts to 100%.Detect the chemical composition of each embodiment, the mass percentage containing rare earth perforation casing material chemical composition of each embodiment is as shown in table 1.Test the mechanical property containing rare earth perforation casing of each embodiment, result is as shown in table 2.
The chemical composition (%) of each embodiment of table 1
| Embodiment | C | Si | Mn | P | S | Cr | Mo | Al | La |
| Embodiment 1 | 0.25 | 0.20 | 1.0 | 0.02 | 0.01 | 0.80 | 0.15 | 0.015 | 0.01 |
| Embodiment 2 | 0.27 | 0.27 | 1.10 | 0.01 | 0.008 | 0.9 | 0.21 | 0.03 | 0.015 |
| Embodiment 3 | 0.28 | 0.29 | 1.12 | 0.013 | 0.007 | 0.95 | 0.23 | 0.035 | 0.02 |
| Embodiment 4 | 0.29 | 0.30 | 1.15 | 0.013 | 0.006 | 1.0 | 0.20 | 0.037 | 0.025 |
| Embodiment 5 | 0.30 | 0.35 | 1.20 | 0.02 | 0.01 | 1.05 | 0.25 | 0.04 | 0.03 |
The mechanical experimental results of each embodiment of table 2
As can be seen from Table 2, weldless steel tube material of the present invention has good mechanical property, particularly has high tenacity.
The present invention is by adding by rare earth element on the basis of low-oxygen steel smelting, and the effect playing its alterant and microalloying to greatest extent makes material also have high toughness while high-strength.
Claims (3)
1. containing the preparation method of rare earth production perforation gun tube body, it is characterized in that, comprising: the rolling of STEELMAKING PRODUCTION, steel, roll state steel heat treatment and aligning, the rolling of described steel comprises: the heating of circle base, perforation, tube rolling and tension reducing; The temperature of described round base heating is 1250 ~ 1300 DEG C, and the temperature of described perforation is 1230 ~ 1260 DEG C, and the start rolling temperature of described tube rolling is 1150 ~ 1220 DEG C, temperature >=890 DEG C of finish to gauge; The described state steel heat treatment that rolls comprised Quench and temper, and the temperature of described quenching is 890 ± 10 DEG C, 890 ± 10 DEG C of insulations 70 ~ 80 minutes; The temperature of described tempering was 630 ± 10 DEG C, 630 ± 10 DEG C of insulations 80 ~ 90 minutes; Temperature >=480 DEG C of described aligning; The mass percentage producing the chemical composition of the material containing rare earth production perforation gun tube body obtained comprises: C 0.25% ~ 0.30%, Si 0.20% ~ 0.35%, Mn 1.0% ~ 1.20%, P≤0.020%, S≤0.010%, Cr 0.80% ~ 1.05%, Mo 0.15% ~ 0.25%, Al 0.015% ~ 0.04% and rare earth La 0.01% ~ 0.03%, all the other are Fe and impurity, and massfraction amounts to 100%.
2. the preparation method containing rare earth production perforation gun tube body as claimed in claim 1, it is characterized in that, described STEELMAKING PRODUCTION comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting; Described converter smelting adopts single slag melting technique, and finishing slag basicity controls 3.0, mass percentage >=0.06% of the carbon of converter terminal; Described LF refining time >=40min, temperature >=1500 DEG C in place of described LF refining, temperature >=1650 DEG C of offing normal of described LF refining; When described LF refining is offed normal, in molten steel, the mass percentage of Al is mass percentage≤0.010% of 0.015% ~ 0.035%, S, and described LF refining terminates rear every 100 tons of molten steel feeding 150m rare-earth wires; Vacuum tightness≤the 0.1kPa of described VD vacuum outgas, adopt bottom blowing argon gas, after described VD vacuum outgas soft blow time >=15min; Described round billet continuous casting adopts the constant pulling rate of 1.4 ~ 1.6m/min.
3. the preparation method containing rare earth production perforation gun tube body as described in any one of claims 1 or 2, it is characterized in that, the mass percentage of the described chemical composition containing rare earth production perforation gun tube body prepared comprises: C 0.25%, Si 0.22%, Mn 1.0%, Cr 0.80%, Al 0.015%, P 0.02%, S 0.010%, Mo 0.15% and La 0.01%; Or, C 0.27%, Si 0.27%, Mn 1.10%, Cr 0.90%, Al 0.03%, P 0.010%, S 0.008%, Mo 0.21% and La 0.015%; Or, C 0.28%, Si 0.29%, Mn 1.12%, Cr 0.95%, Al 0.035%, P 0.013%, S 0.007%, Mo 0.23% and La 0.020%; Or, C 0.29%, Si 0.30%, Mn 1.15%, Cr 1.0%, Al 0.037%, P 0.013%, S 0.006%, Mo 0.20% and La 0.025%; Or, C 0.30%, Si 0.35%, Mn 1.20%, Cr 1.05%, Al 0.04%, P 0.02%, S 0.010%, Mo 0.25% and La 0.03%.
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