CN103014524A - Preparation method of needle steel - Google Patents
Preparation method of needle steel Download PDFInfo
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- CN103014524A CN103014524A CN2012105159265A CN201210515926A CN103014524A CN 103014524 A CN103014524 A CN 103014524A CN 2012105159265 A CN2012105159265 A CN 2012105159265A CN 201210515926 A CN201210515926 A CN 201210515926A CN 103014524 A CN103014524 A CN 103014524A
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Abstract
The invention discloses a preparation method of needle steel. The preparation method comprises the steps of smelting an electric furnace (or a converter), refining out of the furnace (LF (ladle furnace), or LF+VD (vacuum degassing) or LF+RH), continuously casting a billet, heating and rolling, wherein the nitrogen content in the steel is not greater than 80*10<-6>; the oxygen content is not greater than 40*10<-6> after refining out of the furnace or refining out of the furnace and vacuum treatment; the soaking temperature of the billet in the heating furnace is 1000-1280 DEG C; the heating and high-temperature diffusion time is 2-7 hours; the initial rolling temperature is 1000-1180 DEG C and the final rolling temperature is 800-1000 DEG C; controlling and cooling, so that a wire rope has even Sorbite structure (a little of ferrite and pearlite); the Sorbite structure can be directly drawn by downstream customers, or else, abnormal structures such as martensite, ferrito martensite or network cementite and the like are formed; the downstream customers only can draw through thermal treatment, and wire rope of which the standard is phi5.5-6.5mm is rolled.
Description
Technical field
The present invention relates to a kind of preparation method of steel, specifically a kind of pin preparation method of steel.
Background technology
Present high-grade pin is in great demand with steel wire rod, the client need pass through direct drawing, this just requires wire rod to have uniform sorbite tissue (a small amount of ferrite and pearlite can be arranged), and then through cold-forming and quench, tempering process, so to the vertical pulling performance of wire rod with quench, tempering property has requirement.Existing, the pin preparation method of steel, can't make wire rod have uniform sorbite tissue (a small amount of ferrite and pearlite can be arranged), can form the abnormal structures such as martensite, bainite or cementite network, the downstream client can not direct drawing like this, need the drawing of thermal treatment ability, increase production cost.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, proposes a kind of pin with the preparation method of steel, can guarantee that pin with the drawability energy of steel, makes wire rod have uniform sorbite tissue, and a small amount of ferrite and pearlite can be arranged.
The technical scheme that the present invention solves above technical problem is:
A kind of pin comprises electric furnace or converter smelting, external refining, continuous-casting of steel billet and heating rolling with the preparation method of steel, and external refining is LF or LF+VD or LF+RH; Pin with the chemical component weight per-cent of steel is: C:0.85-0.95%, Si:0.10-0.35%, Mn:0.10-0.60%, Cr:0.01-0.60%, Ni:0.01-0.50%, Cu:0.01-0.50%, Al :≤0.03%, P :≤0.030%, S :≤0.030%, N :≤0.0080%, O :≤0.0040%, surplus is remaining iron and trace impurity;
In electric furnace or the converter smelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 30-90%, steel scrap adopts carbon steel scrap, (phosphorus or sulphur content are high not add high phosphorus or high-sulfur steel scrap, general is high phosphorus high-sulfur steel scrap above 0.03%), adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, tapping process and the tapping after the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 500-700L/min, and pressure is 8-10bar, the soft stirring of blowing argon gas after strong mixing 10-15 minute, soft stirring argon flow amount is 150-250L/min, pressure is 3-4bar, tapping temperature 1560-1680 ℃, and the weight percent C of C≤0.20% in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 5-60min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 90-100L/min, pressure is 1-2bar, after external refining or external refining+vacuum-treat, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1000-1200 ℃ in the continuous casting, storing time 4-8 hour, casting process wants the full guard cast (to seal from the long nozzle argon, tundish adopts insulating covering agent, the submerged nozzle sealing, to crystallizer protecting residue, whole process does not allow the direct ingress of air of molten steel), superheating temperature is used the high carbon steel covering slag, middle bag liquid level 300-800mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts the cast of bloom 〉=200mm * 200mm or little square billet＜200mm * 200mm or rectangular bloom less than or equal to ± 8%;
In the heating rolling operation, blank is 1000-1280 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 2-7 hour, start rolling temperature 1000-1180 ℃, finishing temperature 800-1000 ℃, 800-1000 ℃ of control laying temperature, speed of cooling 5-35 ℃/S, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 5.5-6.5mm.
Like this, by above composition and technology controlling and process, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, but such downstream client direct drawing, otherwise form the abnormal structures such as martensite, bainite or cementite network, the downstream client needs the thermal treatment could drawing; In electric furnace of the present invention or the converter smelting operation, by being used in combination of " quiet stirring " after " strong mixing " and " soft stirring " and the refining, be conducive to the subsequent handling wire rod and accelerate to form uniform sorbite tissue, and sorbite being organized more even.
The invention has the beneficial effects as follows: the present invention is by composition and technology controlling and process, can guarantee the pin drawability energy of steel, can not need the thermal treatment direct drawing to Ф 3mm even thinner specification from the wire rod of Ф 5.5-6.5mm, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, avoid forming the abnormal structures such as martensite, bainite or cementite network, Fig. 1 is the metallographic structure photo that pin of the present invention is used steel, and 1000 * microstructure is mainly sorbite and a small amount of ferrite and perlite.
Description of drawings
Fig. 1 is the metallographic structure photo that pin of the present invention is used steel.
Embodiment
Embodiment 1
Present embodiment is the preparation method that a kind of pin is used steel, comprises electrosmelting, external refining, continuous-casting of steel billet and heating rolling, and external refining is LF; The present embodiment pin with the chemical component weight per-cent of steel is: C:0.9%, Si:0.22%, Mn:0.33%, Cr:0.19%, Ni:0.02%, Cu:0.04%, Al:0.0014%, P:0.006%, S:0.006%, N:0.0038%, O:0.0012%, surplus is remaining iron and trace impurity;
In the electrosmelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 40%, steel scrap adopts carbon steel scrap, (phosphorus or sulphur content are high not add high phosphorus or high-sulfur steel scrap, general is high phosphorus high-sulfur steel scrap above 0.03%), adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, tapping process and the tapping after the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 600L/min, and pressure is 9bar, and strong mixing is the soft stirring of blowing argon gas after 10 minutes, soft stirring argon flow amount is 200L/min, pressure is 3.5bar, 1610 ℃ of tapping temperatures, the weight percent C of C≤0.20% in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 15min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 90L/min, pressure is 1.5bar, after external refining, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1100 ℃ in the continuous casting, storing time 5.5 hours, casting process wants the full guard cast (to seal from the long nozzle argon, tundish adopts insulating covering agent, and the submerged nozzle sealing is to crystallizer protecting residue, whole process does not allow the direct ingress of air of molten steel), superheating temperature is used the high carbon steel covering slag, middle bag liquid level 500mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts little square billet＜150mm * 150mm cast less than or equal to ± 8%;
In the heating rolling operation, blank is 1260 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 2.5 hours, 1080 ℃ of start rolling temperatures, 880 ℃ of finishing temperatures, 800 ℃ of control laying temperatures, 5 ℃/S of speed of cooling, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 5.5.
Embodiment 2
Present embodiment is the preparation method that a kind of pin is used steel, comprises converter smelting, external refining, continuous-casting of steel billet and heating rolling, and external refining is LF+VD; The present embodiment pin with the chemical component weight per-cent of steel is: C:0.85%, Si:0.10%, Mn:0.50%, Cr:0.25%, Ni:0.01%, Cu:0.01%, Al:0.03%, P:0.020%, S:0.020%, N:0.0080%, O:0.0040%, surplus is remaining iron and trace impurity;
In the converter smelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 90%, steel scrap adopts carbon steel scrap, (phosphorus or sulphur content are high not add high phosphorus or high-sulfur steel scrap, general is high phosphorus high-sulfur steel scrap above 0.03%), adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, tapping process and the tapping after the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 500L/min, and pressure is 8bar, and strong mixing is the soft stirring of blowing argon gas after 10 minutes, soft stirring argon flow amount is 150L/min, pressure is 3bar, 1590 ℃ of tapping temperatures, the weight percent C of C≤0.20% in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 10min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 90L/min, pressure is 1bar, after external refining+vacuum-treat, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1000 ℃ in the continuous casting, storing time 6 hours, casting process wants the full guard cast (to seal from the long nozzle argon, tundish adopts insulating covering agent, and the submerged nozzle sealing is to crystallizer protecting residue, whole process does not allow the direct ingress of air of molten steel), superheating temperature is used the high carbon steel covering slag, middle bag liquid level 800mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts bloom 320mm * 480mm cast less than or equal to ± 8%;
In the heating rolling operation, blank is 1260 ℃ in the soaking temperature of process furnace, 6 hours heat-up times, cogging becomes the little square billet of 150mm * 150mm, become a useful person to high speed wire rolling, heating and High temperature diffusion time are 2 hours, 1000 ℃ of start rolling temperatures again, 800 ℃ of finishing temperatures, 900 ℃ of control laying temperatures, 25 ℃/S of speed of cooling makes wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 6.0mm.
Embodiment 3
Present embodiment is the preparation method that a kind of pin is used steel, comprises electric furnace, external refining, continuous-casting of steel billet and heating rolling, and external refining is LF+RH; The present embodiment pin with the chemical component weight per-cent of steel is: C:0.95%, Si:0.35%, Mn:0.25%, Cr:0.15%, Ni:0.10%, Cu:0.20%, Al:0.01%, P:0.009%, S:0.010%, N:0.0020%, O:0.0010%, surplus is remaining iron and trace impurity;
In the electrosmelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 50%, steel scrap adopts carbon steel scrap, (phosphorus or sulphur content are high not add high phosphorus or high-sulfur steel scrap, general is high phosphorus high-sulfur steel scrap above 0.03%), adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, tapping process and the tapping after the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 700L/min, and pressure is 10bar, and strong mixing is the soft stirring of blowing argon gas after 15 minutes, soft stirring argon flow amount is 250L/min, pressure is 4bar, 1600 ℃ of tapping temperatures, the weight percent C of C≤0.20% in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 15min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 100L/min, pressure is 2bar, after refining+vacuum-treat, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1200 ℃ in the continuous casting, storing time 7 hours, casting process wants the full guard cast (to seal from the long nozzle argon, tundish adopts insulating covering agent, and the submerged nozzle sealing is to crystallizer protecting residue, whole process does not allow the direct ingress of air of molten steel), superheating temperature is used the high carbon steel covering slag, middle bag liquid level 600mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts the rectangular bloom cast less than or equal to ± 8%;
In the heating rolling operation, blank is 1280 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 7 hours, 1180 ℃ of start rolling temperatures, 1000 ℃ of finishing temperatures, 1000 ℃ of control laying temperatures, 35 ℃/S of speed of cooling, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 6.5mm.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. the preparation method of a pin usefulness steel comprises electric furnace or converter smelting, external refining, continuous-casting of steel billet and heating rolling, and described external refining is LF or LF+VD or LF+RH; It is characterized in that: described pin with the chemical component weight per-cent of steel is: C:0.85-0.95%, Si:0.10-0.35%, Mn:0.10-0.60%, Cr:0.01-0.60%, Ni:0.01-0.50%, Cu:0.01-0.50%, Al :≤0.03%, P :≤0.030%, S :≤0.030%, N :≤0.0080%, O :≤0.0040%, surplus is remaining iron and trace impurity;
In described electric furnace or the converter smelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 30-90%, steel scrap adopts carbon steel scrap, do not add high phosphorus or high-sulfur steel scrap, adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, tapping process and the tapping after the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 500-700L/min, pressure is 8-10bar, the soft stirring of blowing argon gas after strong mixing 10-15 minute, soft stirring argon flow amount is 150-250L/min, pressure is 3-4bar, tapping temperature 1560-1680 ℃, the weight percent C≤0.20% of C in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the described external refining operation, desulfurization and deoxidation operation, the quiet 5-60min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 90-100L/min, pressure is 1-2bar, after external refining or external refining+vacuum-treat, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the described continuous-casting of steel billet operation, the bag storing temperature is 1000-1200 ℃ in the continuous casting, storing time 4-8 hour, casting process is wanted the full guard cast, superheating temperature is used the high carbon steel covering slag, middle bag liquid level 300-800mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts the cast of bloom 〉=200mm * 200mm or little square billet＜200mm * 200mm or rectangular bloom less than or equal to ± 8%;
In the described heating rolling operation, blank is 1000-1280 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 2-7 hour, start rolling temperature 1000-1180 ℃, finishing temperature 800-1000 ℃, 800-1000 ℃ of control laying temperature, speed of cooling 5-35 ℃/S, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 5.5-6.5mm.
2. pin as claimed in claim 1 is with the preparation method of steel, and it is characterized in that: comprise electrosmelting, external refining, continuous-casting of steel billet and heating rolling, external refining is LF; Pin with the chemical component weight per-cent of steel is: C:0.9%, Si:0.22%, Mn:0.33%, Cr:0.19%, Ni:0.02%, Cu:0.04%, Al:0.0014%, P:0.006%, S:0.006%, N:0.0038%, O:0.0012%, surplus is remaining iron and trace impurity;
In the electrosmelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 40%, steel scrap adopts carbon steel scrap, do not add high phosphorus or high-sulfur steel scrap, adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, after tapping process and the tapping the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 600L/min, pressure is 9bar, strong mixing is the soft stirring of blowing argon gas after 10 minutes, and soft stirring argon flow amount is 200L/min, and pressure is 3.5bar, 1610 ℃ of tapping temperatures, the weight percent C≤0.20% of C in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 15min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 90L/min, pressure is 1.5bar, after external refining, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1100 ℃ in the continuous casting, storing time 5.5 hours, casting process is wanted the full guard cast, superheating temperature is used the high carbon steel covering slag, middle bag liquid level 500mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts little square billet＜150mm * 150mm cast less than or equal to ± 8%;
In the heating rolling operation, blank is 1260 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 2.5 hours, 1080 ℃ of start rolling temperatures, 880 ℃ of finishing temperatures, 800 ℃ of control laying temperatures, 5 ℃/S of speed of cooling, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 5.5.
3. pin as claimed in claim 1 is with the preparation method of steel, and it is characterized in that: comprise converter smelting, external refining, continuous-casting of steel billet and heating rolling, external refining is LF+VD; Pin with the chemical component weight per-cent of steel is: C:0.85%, Si:0.10%, Mn:0.50%, Cr:0.25%, Ni:0.01%, Cu:0.01%, Al:0.03%, P:0.020%, S:0.020%, N:0.0080%, O:0.0040%, surplus is remaining iron and trace impurity;
In the converter smelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 90%, steel scrap adopts carbon steel scrap, do not add high phosphorus or high-sulfur steel scrap, adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, after tapping process and the tapping the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 500L/min, pressure is 8bar, strong mixing is the soft stirring of blowing argon gas after 10 minutes, and soft stirring argon flow amount is 150L/min, and pressure is 3bar, 1590 ℃ of tapping temperatures, the weight percent C≤0.20% of C in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 10min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 90L/min, pressure is 1bar, after external refining+vacuum-treat, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1000 ℃ in the continuous casting, storing time 6 hours, casting process is wanted the full guard cast, superheating temperature is used the high carbon steel covering slag, middle bag liquid level 800mm less than or equal to 30 ℃, liquid level fluctuation of crystallizer adopts bloom 320mm * 480mm cast less than or equal to ± 8%;
In the heating rolling operation, blank is 1260 ℃ in the soaking temperature of process furnace, 6 hours heat-up times, cogging becomes the little square billet of 150mm * 150mm, become a useful person to high speed wire rolling, heating and High temperature diffusion time are 2 hours, 1000 ℃ of start rolling temperatures again, 800 ℃ of finishing temperatures, 900 ℃ of control laying temperatures, 25 ℃/S of speed of cooling makes wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 6.0mm.
4. pin as claimed in claim 1 is with the preparation method of steel, and it is characterized in that: comprise electric furnace, external refining, continuous-casting of steel billet and heating rolling, external refining is LF+RH; Pin with the chemical component weight per-cent of steel is: C:0.95%, Si:0.35%, Mn:0.25%, Cr:0.15%, Ni:0.10%, Cu:0.20%, Al:0.01%, P:0.009%, S:0.010%, N:0.0020%, O:0.0010%, surplus is remaining iron and trace impurity;
In the electrosmelting operation, the ratio that the weight of molten iron and the pig iron accounts for the raw material gross weight is 50%, steel scrap adopts carbon steel scrap, do not add high phosphorus or high-sulfur steel scrap, adopt alloying and pre-deoxidation in the bag during tapping, add ferromanganese, ferrosilicon and carbon dust as alloy material and lime as slag material, after tapping process and the tapping the strong mixing of carburetting process ladle bottom blowing argon gas, the strong mixing argon flow amount is 700L/min, pressure is 10bar, strong mixing is the soft stirring of blowing argon gas after 15 minutes, and soft stirring argon flow amount is 250L/min, and pressure is 4bar, 1600 ℃ of tapping temperatures, the weight percent C≤0.20% of C in the control endpoint molten steel, P≤0.020% is forbidden lower slag during tapping;
In the external refining operation, desulfurization and deoxidation operation, the quiet 15min that stirs of blowing argon gas after refining finishes, the quiet argon flow amount that stirs is 100L/min, pressure is 2bar, after refining+vacuum-treat, makes the weight percent content of nitrogen in steel less than or equal to 80 * 10
-6, the weight percent content of oxygen is less than or equal to 40 * 10
-6
In the continuous-casting of steel billet operation, the bag storing temperature is 1200 ℃ in the continuous casting, storing time 7 hours, casting process is wanted the full guard cast, and superheating temperature is used the high carbon steel covering slag less than or equal to 30 ℃, middle bag liquid level 600mm, liquid level fluctuation of crystallizer adopt the rectangular bloom cast less than or equal to ± 8%;
In the heating rolling operation, blank is 1280 ℃ in the soaking temperature of process furnace, heating and High temperature diffusion time are 7 hours, 1180 ℃ of start rolling temperatures, 1000 ℃ of finishing temperatures, 1000 ℃ of control laying temperatures, 35 ℃/S of speed of cooling, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be arranged, the wire rod of rolling specs Ф 6.5mm.
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| CN109957711A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | Cord steel wire rod and production method thereof |
| CN110629132A (en) * | 2019-09-26 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for ultra-high strength steel cord and method for producing same |
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Application publication date: 20130403 |