CN105331895A - Chromium-containing tire cord steel and preparation method thereof - Google Patents
Chromium-containing tire cord steel and preparation method thereof Download PDFInfo
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- CN105331895A CN105331895A CN201510817739.6A CN201510817739A CN105331895A CN 105331895 A CN105331895 A CN 105331895A CN 201510817739 A CN201510817739 A CN 201510817739A CN 105331895 A CN105331895 A CN 105331895A
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Abstract
The invention discloses chromium-containing tire cord steel. An NT level of chromium-containing tire cord steel comprises the following chemical components: 0.69-0.76 percent of C, 0.15-0.30 percent of Si, 0.15-0.60 percent of Mn, 0.30-0.60 percent of Cr, equal to or less than 0.025 percent of P, equal to or less than 0.025 percent of S, equal to or less than 0.10 percent of Ni, equal to or less than 0.10 percent of Cu, equal to or less than 0.030 percent of As, equal to or less than 0.0050 percent of Al, equal to or less than 0.0080 percent of N, and equal to or less than 0.0030 percent of O; and an HT level of chromium-containing tire cord steel comprises the following chemical components: 0.79-0.86 percent of C, 0.15-0.30 percent of Si, 0.15-0.60 percent of Mn, 0.30-0.60 percent of Cr, equal to or less than 0.025 percent of P, equal to or less than 0.025 percent of S, equal to or less than 0.10 percent of Ni, equal to or less than 0.10 percent of Cu, equal to or less than 0.030 percent of As, equal to or less than 0.0050 percent of Al, equal to or less than 0.0080 percent of N, and equal to or less than 0.030 percent of O. The trace element Cr is added in the chromium-containing tire cord steel, and the content of the trace element Cr in the tire cord steel is controlled, so that the stability of the steel structure is ensured, and the chromium-containing tire cord steel meets the tire cord steel manufacturing requirements of processing enterprises, especially the export requirement.
Description
Technical field
The invention belongs to field of steel metallurgy, be specifically related to a kind of containing chromium cord steel and preparation method thereof.
Background technology
At present, (regular tenacity) NT and HT(high strength both at home and abroad) cord steel, all do not contain Cr, Cr, Ni, Cu all as residual element, meet the main boracic of demand for exports (more than 0.0008%).Existing cord steel easily forms the abnormal structure such as martensite, cementite network after process for cooling, and structure of steel stability is not high, thus has an impact to the over-all properties of steel cord; Separately, the comprehensive drawing property of existing cord steel is undesirable.
Summary of the invention
Technical problem to be solved by this invention is:
(1) how to improve cord steel and organize net carbon, improve sorbitic rate simultaneously, and improve the comprehensive drawing property of cord;
(2) how to ensure the stability of cord steel tissue, there is uniform sorbite tissue (can have a small amount of ferrite and pearlite), avoid the formation of the abnormal structure such as martensite, cementite network; Can make wire rod have excellent can drawing processing characteristics.
The technical scheme that the present invention solves above technical problem is:
A kind of NT(regular tenacity) grade chromium-containing cord steel, its chemical component weight per-cent is: C:0.69-0.76%, Si:0.15-0.30%, Mn:0.15-0.60%, Cr:0.30-0.60%, P≤0.025%, S≤0.025%, Ni≤0.10%, Cu≤0.10%, As≤0.030%, Al≤0.0050%, N≤0.0080%, O≤0.0030%, surplus is iron and trace impurity.
A kind of HT(high strength) grade chromium-containing cord steel, its chemical component weight per-cent is: C:0.79-0.86%, Si:0.15-0.30%, Mn:0.15-0.60%, Cr:0.30-0.60%, P≤0.025%, S≤0.025%, Ni≤0.10%, Cu≤0.10%, As≤0.030%, Al≤0.0050%, N≤0.0080%, O≤0.0030%, surplus is iron and trace impurity.
The production technique containing chromium cord steel of two kinds of ranks (NT level or HT level), comprises electric furnace or converter smelting, external refining, continuous-casting of steel billet and heating rolling, and external refining adopts LF refining or LF refining+VD vacuum-treat, or LF refining+RH processes; Wherein, after external refining, nitrogen in steel content is made to be not more than 80 × 10
-6, oxygen level is not more than 30 × 10
-6; Strand is 1080-1280 DEG C in the soaking temperature of process furnace, and heating and High temperature diffusion time are 2-5 hour; Start rolling temperature 1040-1180 DEG C, finishing temperature 830-980 DEG C, control Stelmor cools (i.e. laying temperature 830-930 DEG C, adopt Cooling Mode, before phase transformation, speed of cooling is 5-30 DEG C/S, roller table speed 0.5-2m/S), make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be had, avoid the formation of the abnormal structure such as martensite, cementite network; The wire rod of rolling specs Ф 5.0-6.5mm.
By above technical scheme, the present invention proposes a kind of composition range containing chromium cord steel and preparation method thereof, for the production of small dimension Φ 5.0-6.5mm wire rod, improve the over-all properties of steel cord, meet requirement and demand that cord steel outlet contains chromium.
The present invention is by adding the Cr element of 0.30-0.60%, and coordinate the composition of other element to limit, and preparation method, can fining austenite grains, improve the hardening capacity of steel, can the pearlite interlaminar spacing of refinement steel wire rod, improve the sorbite rate of steel, thus make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be had, avoid the formation of the abnormal structure such as martensite, cementite network; The intensity of steel wire rod and over-all properties are improved,
The present invention is by adding the Cr element of 0.30-0.60%, and suitably reduce Mn content (control Mn content is 0.15-0.60%), thus play improvement result cord steel being organized to net carbon, improve sorbitic rate simultaneously, improve the cold-drawn work hardening rate of cord, obtain beyond thought technique effect.
The technical scheme that the present invention limits further is:
The aforesaid production technique containing chromium cord steel, the ratio that before smelting, the weight of molten iron and the pig iron accounts for raw material gross weight in feed stock for blast furnace is not less than 50%, preferential molten iron proportion is greater than 60%, and steel scrap adopts high-quality carbon steel scrap, does not allow to add residual element content higher and high phosphorus, sulphur steel scrap.
The aforesaid production technique containing chromium cord steel, when electric furnace or converter tapping, adopts alloying and pre-deoxidation in bag, keeps the continuous argon bottom-blowing of ladle, tapping temperature>=1560 DEG C after tapping process and tapping; Refining can be selected change slag or do not change slag operation according to molten iron and equipment situation, but ensure that sulphur content meets the demands, a sample total analysis is got in refining after fully stirring, and according to a sample analytical results, by internally controlling requirement adjusting component, deoxidation simultaneously need control to and ensure that material oxygen (oxygen level of stocking) content is not more than 30 × 10
-6; Ferrochrome adds after refining final deoxygenation or Fruit storage, adds by rate of recovery 60-90%, samples total analysis after composition adjustment, and deficiency adds fine setting; Soft blow argon gas churning time>=8 minute, must not expose molten steel during stirring.
The aforesaid production technique containing chromium cord steel, in continuous casting, bag storing temperature and time put in place, and crystallizer meets the requirements to arc, mouth of a river centering, and nozzle atomization is respond well; Adopt bloom or small billet cast, casting process adopts full guard cast, uses high carbon steel covering slag, and middle bag liquid level must not lower than 400mm, liquid level fluctuation of crystallizer within ± 8%, hot delivering technology of CC billets or wind sheltering cooling in heap or enter to cheat slow cooling; Described bloom is square billet or the square base of size >=200mm × 200mm, and described small billet is square billet or the square base of size < 200mm × 200mm.
Accompanying drawing explanation
Fig. 1 is the NT grade chromium-containing cord steel metallographic structure figure of the embodiment of the present invention 1.
Fig. 2 is the HT grade chromium-containing cord steel metallographic structure figure of the embodiment of the present invention 4.
Embodiment
embodiment 1
The present embodiment provides a kind of NT grade chromium-containing cord steel, is specially:
(1) chemical component weight per-cent is: C:0.71%, Si:0.19%, Mn:0.25%, Cr:0.32%, P:0.008%, S:0.010%, Ni:0.02%, Cu:0.04%, As:0.0052%, Al:0.0022%, N:0.0043%, O:0.0010%, surplus is iron and trace impurity.
(2) the operational path of the present embodiment is:
Batching → UHP electric arc furnace → mono-time LF refining furnace → VD vacuum-treat → secondary LF refining furnace → continuous casting (150mm × 150mm) → continuously cast bloom inspection → heating → rolling (specification Ф 5.5mm) → controlled cooling model → collection is rolled up → is checked, packs → weigh, puts in storage.
(3) preparation method's main technique measure of the present embodiment:
1) enter molten iron 65 tons in stove iron and steel stock structure, steel scrap 35 tons, adopt high-quality carbon steel scrap.
2) making foamed slag flow slag, change slag operation, tapping temperature 1600 DEG C during electrosmelting, forbids slag during tapping.
3) alloying and pre-deoxidation in electric furnace steel tapping bag, add the slag materials such as alloy material and lime such as ferromanganese, ferrosilicon, carbon dust, tapping process and carburetting process ladle bottom blowing argon gas strong mixing (600L/min, 9.0bar) after tapping, soft stirring (200L/min after strong mixing, 3.5bar), refining composition adjustment, and desulfurization, deoxidation, slag operation is changed in rear employing, ferrochrome adds by the rate of recovery 90% after Fruit storage, and sample total analysis after composition adjustment, deficiency adds fine setting.After refining terminates, quietly stir (90L/min, 1.5bar) time 15min.
4) bag storing temperature 1100 DEG C in continuous casting; baking time 5 hours; crystallizer meets the requirements to arc, mouth of a river centering; nozzle atomization is respond well, and small billet (150mm × 150mm) is poured into a mould, and casting process full guard is poured into a mould; within superheating temperature 30 DEG C; adopt high carbon steel covering slag, middle bag liquid level 700mm, liquid level fluctuation of crystallizer is within ± 6%.
5) continuously cast bloom wind sheltering cooling in heap, shot-peening inspection after cooling, during rolling, small billet (150mm × 150mm) is 1120-1240 DEG C of heating and High temperature diffusion time in the soaking temperature of process furnace is 2.5 hours, start rolling temperature 1080-1100 DEG C, finishing temperature 850-880 DEG C.
6) wire rod of rolling Ф 5.5mm specification, control Stelmor cooling makes wire rod have uniform sorbite tissue (a small amount of ferrite and pearlite), avoids the formation of the abnormal structure such as martensite, cementite network; Laying temperature 830 DEG C, adopts Cooling Mode, speed of cooling 5 DEG C/S, roller table speed 0.5m/S before phase transformation.
7) scratching and corrosion are noted in wire rod bailing and storage transport.
The metallographic structure figure of the present embodiment is as shown in Figure 1 (sodium picrate corrosion): a.NT grade chromium-containing cord steel, As rolled: 1000 ×, microstructure is mainly sorbite and a small amount of ferrite and perlite.
embodiment 2
The present embodiment provides a kind of NT grade chromium-containing cord steel, is specially:
(1) chemical component weight per-cent is: C:0.69%, Si:0.15%, Mn:0.15%, Cr:0.30%, P:0.008%, S:0.010%, Ni:0.03%, Cu:0.09%, As:0.0030%, Al:0.0050%, N:0.0080%, O:0.0030%, surplus is iron and trace impurity.
(2) the operational path of the present embodiment is:
Batching → UHP electric arc furnace → mono-time LF refining furnace → VD vacuum-treat → secondary LF refining furnace → continuous casting (150mm × 150mm) → continuously cast bloom inspection → heating → rolling (specification Ф 5.5mm) → controlled cooling model → collection is rolled up → is checked, packs → weigh, puts in storage.
(3) preparation method's main technique measure of the present embodiment:
1) enter molten iron 65 tons in stove iron and steel stock structure, steel scrap 35 tons, adopt high-quality carbon steel scrap.
2) making foamed slag flow slag, change slag operation, tapping temperature 1560 DEG C during electrosmelting, forbids slag during tapping.
3) alloying and pre-deoxidation in electric furnace steel tapping bag, add the slag materials such as alloy material and lime such as ferromanganese, ferrosilicon, carbon dust, tapping process and carburetting process ladle bottom blowing argon gas strong mixing (600L/min, 9.0bar) after tapping, soft stirring (200L/min after strong mixing, 3.5bar), refining composition adjustment, and desulfurization, deoxidation, slag operation is changed in rear employing, ferrochrome adds by the rate of recovery 88% after Fruit storage, and sample total analysis after composition adjustment, deficiency adds fine setting.After refining terminates, quietly stir (90L/min, 1.5bar) time 15min.
4) bag storing temperature 1100 DEG C in continuous casting; baking time 5 hours; crystallizer meets the requirements to arc, mouth of a river centering; nozzle atomization is respond well, and small billet (150mm × 150mm) is poured into a mould, and casting process full guard is poured into a mould; within superheating temperature 30 DEG C; adopt high carbon steel covering slag, middle bag liquid level 700mm, liquid level fluctuation of crystallizer is within ± 6%.
5) continuously cast bloom wind sheltering cooling in heap, shot-peening inspection after cooling, during rolling, small billet (150mm × 150mm) is 1080-1100 DEG C in the soaking temperature of process furnace, and heating and High temperature diffusion time are 2 hours, start rolling temperature 1040-1080 DEG C, finishing temperature 830-850 DEG C.
6) wire rod of rolling Ф 5.5mm specification, control Stelmor cooling makes wire rod have uniform sorbite tissue (a small amount of ferrite and pearlite), avoids the formation of the abnormal structure such as martensite, cementite network; Laying temperature 850 DEG C, adopts Cooling Mode, speed of cooling 10 DEG C/S, roller table speed 1m/S before phase transformation.
7) scratching and corrosion are noted in wire rod bailing and storage transport.
embodiment 3
The present embodiment provides a kind of HT grade chromium-containing cord steel, is specially:
(1) chemical component weight per-cent is: C:0.76%, Si:0.30%, Mn:0.60%, Cr:0.60%, P:0.008%, S:0.009%, Ni:0.09%, Cu:0.05%, As:0.0035%, Al:0.0023%, N:0.0033%, O:0.0020%, surplus is iron and trace impurity.
(2) the operational path of the present embodiment is:
Batching → UHP electric arc furnace → mono-time LF refining furnace → VD vacuum-treat → secondary LF refining furnace → continuous casting (200mm × 200mm) → continuously cast bloom inspection → heating → rolling (specification Ф 6.5mm) → controlled cooling model → collection is rolled up → is checked, packs → weigh, puts in storage.
(3) preparation method's main technique measure of the present embodiment:
1) enter molten iron 65 tons in stove iron and steel stock structure, steel scrap 35 tons, adopt high-quality carbon steel scrap.
2) making foamed slag flow slag, change slag operation, tapping temperature 1600 DEG C during electrosmelting, forbids slag during tapping.
3) alloying and pre-deoxidation in electric furnace steel tapping bag, add the slag materials such as alloy material and lime such as ferromanganese, ferrosilicon, carbon dust, tapping process and carburetting process ladle bottom blowing argon gas strong mixing (600L/min, 9.0bar) after tapping, soft stirring (200L/min after strong mixing, 3.5bar), refining composition adjustment, and desulfurization, deoxidation, slag operation is changed in rear employing, ferrochrome adds by the rate of recovery 90% after Fruit storage, and sample total analysis after composition adjustment, deficiency adds fine setting.After refining terminates, quietly stir (90L/min, 1.5bar) time 15min.
4) bag storing temperature 1100 DEG C in continuous casting; baking time 5 hours; crystallizer meets the requirements to arc, mouth of a river centering; nozzle atomization is respond well, and bloom (200mm × 2000mm) is poured into a mould, and casting process full guard is poured into a mould; within superheating temperature 30 DEG C; adopt high carbon steel covering slag, middle bag liquid level 700mm, liquid level fluctuation of crystallizer is within ± 6%.
5) continuously cast bloom wind sheltering cooling in heap, shot-peening inspection after cooling, during rolling, bloom (200mm × 200mm) is 1260-1280 DEG C in the soaking temperature of process furnace, and heating and High temperature diffusion time are 5 hours, start rolling temperature 1160-1180 DEG C, finishing temperature 960-980 DEG C.
6) rolling Ф 6.5mm specification, control Stelmor cooling makes wire rod have uniform sorbite tissue (a small amount of ferrite and pearlite), avoids the formation of the abnormal structure such as martensite, cementite network; Laying temperature 900 DEG C, adopt Cooling Mode, before phase transformation, speed of cooling controls at 20 DEG C/S(degree per second), roller table speed 1.5m/S.
7) scratching and corrosion are noted in wire rod bailing and storage transport.
embodiment 4
The present embodiment provides a kind of HT grade chromium-containing cord steel, is specially:
(1) chemical component weight per-cent is: C:0.80%, Si:0.18%, Mn:0.23%, Cr:0.33%, P:0.010%, S:0.010%, Ni:0.02%, Cu:0.03%, As:0.0045%, Al:0.0017%, N:0.0046%, O:0.0010%, surplus is iron and trace impurity.
(2) the operational path of the present embodiment is:
Batching → UHP electric arc furnace → mono-time LF refining furnace → VD vacuum-treat → secondary LF refining furnace → continuous casting (320mm × 480mm) → continuously cast bloom inspection → heating → cogging (150mm × 150mm) → cogging small billet inspection → heating → rolling (specification Ф 5.5mm) → controlled cooling model → collection is rolled up → is checked, packs → weigh, puts in storage.
(3) preparation method's main technique measure:
1) enter molten iron 63 tons in stove iron and steel stock structure, steel scrap 37 tons, adopt high-quality carbon steel scrap.
2) making foamed slag flow slag, change slag operation, tapping temperature 1610 DEG C during electrosmelting, forbids slag during tapping.
3) alloying and pre-deoxidation in electric furnace steel tapping bag, add the slag materials such as alloy material and lime such as ferromanganese, ferrosilicon, carbon dust, tapping process and carburetting process ladle bottom blowing argon gas strong mixing (600L/min, 9.0bar) after tapping, soft stirring (200L/min after strong mixing, 3.5bar), refining composition adjustment, and desulfurization, deoxidation, slag operation is changed in rear employing, ferrochrome adds by the rate of recovery 80% after Fruit storage, and sample total analysis after composition adjustment, deficiency adds fine setting.After refining terminates, quietly stir (90L/min, 1.5bar) time 20min.
4) bag storing temperature 1100 DEG C in continuous casting, baking time 5.5 hours.Crystallizer meets the requirements to arc, mouth of a river centering, and nozzle atomization is respond well.Bloom (320mm × 480mm) is poured into a mould.Casting process full guard is poured into a mould, and within superheating temperature 30 DEG C, adopt high carbon steel covering slag, middle bag liquid level 700mm, liquid level fluctuation of crystallizer is within ± 5%.
5) continuously cast bloom enters to cheat slow cooling, blank inspection.During cogging, bloom (320mm × 480mm) is at the soaking temperature 1200-1280 DEG C of process furnace, start rolling temperature 1060-1180 DEG C.Cogging small billet (150mm × 150mm) wind sheltering cooling in heap, checks.During rolling, small billet (150mm × 150mm) is 1120-1240 DEG C in the soaking temperature of process furnace, allows the temperature difference ± 20 DEG C, and heating and High temperature diffusion time are 2.5-5 hour, start rolling temperature 1060-1180 DEG C, finishing temperature 850-980 DEG C.
6) wire rod of rolling Ф 5.5mm specification, control Stelmor cooling makes wire rod have uniform sorbite tissue (with a small amount of perlite), avoids the formation of the abnormal structure such as martensite, cementite network; Laying temperature 930 DEG C, adopts Cooling Mode, speed of cooling 30 DEG C/S, roller table speed 2m/S before phase transformation.
7) scratching and corrosion are noted in wire rod bailing and storage transport.
The metallographic structure figure of the present embodiment is as shown in Figure 1 (sodium picrate corrosion): b.HT grade chromium-containing cord steel, As rolled: 1000 ×, microstructure is mainly sorbite and a small amount of perlite.
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 application claims.
Claims (6)
1. a NT grade chromium-containing cord steel, is characterized in that: its chemical component weight per-cent is: C:0.69-0.76%, Si:0.15-0.30%, Mn:0.15-0.60%, Cr:0.30-0.60%, P≤0.025%, S≤0.025%, Ni≤0.10%, Cu≤0.10%, As≤0.030%, Al≤0.0050%, N≤0.0080%, O≤0.0030%, surplus is iron and trace impurity.
2. a HT grade chromium-containing cord steel, is characterized in that: its chemical component weight per-cent is: C:0.79-0.86%, Si:0.15-0.30%, Mn:0.15-0.60%, Cr:0.30-0.60%, P≤0.025%, S≤0.025%, Ni≤0.10%, Cu≤0.10%, As≤0.030%, Al≤0.0050%, N≤0.0080%, O≤0.0030%, surplus is iron and trace impurity.
3. the production technique containing chromium cord steel as claimed in claim 1 or 2, comprise electric furnace or converter smelting, external refining, continuous-casting of steel billet and heating rolling, described external refining is LF refining or LF refining+VD vacuum-treat, or LF refining+RH processes; It is characterized in that: after external refining, make nitrogen in steel content be not more than 80 × 10
-6, oxygen level is not more than 30 × 10
-6; Strand is 1080-1280 DEG C in the soaking temperature of process furnace, and heating and High temperature diffusion time are 2-5 hour; Start rolling temperature 1040-1180 DEG C, finishing temperature 830-980 DEG C, laying temperature 830-930 DEG C, speed of cooling 5-30 DEG C/S before phase transformation, roller table speed 0.5-2m/S, make wire rod have uniform sorbite tissue, a small amount of ferrite and pearlite can be had, avoid the formation of martensite, cementite network class abnormal structure; The wire rod of rolling specs Ф 5.0-6.5mm.
4. the production technique containing chromium cord steel as claimed in claim 3, it is characterized in that: the ratio that before smelting, the weight of molten iron and the pig iron accounts for raw material gross weight in feed stock for blast furnace is not less than 50%, preferential molten iron proportion is greater than 60%, and steel scrap adopts high-quality carbon steel scrap, does not add high phosphorus and high-sulfur steel scrap.
5. the production technique containing chromium cord steel as claimed in claim 3, is characterized in that: when electric furnace or converter tapping, adopts alloying and pre-deoxidation in bag, keeps the continuous argon bottom-blowing of ladle, tapping temperature>=1560 DEG C after tapping process and tapping; Refining can be selected change slag or do not change slag operation according to molten iron and equipment situation, but ensure that sulphur content meets the demands, a sample total analysis is got in refining after fully stirring, and according to a sample analytical results, by internally controlling requirement adjusting component, deoxidation simultaneously need control to and ensure that material oxygen level is not more than 30 × 10
-6; Ferrochrome adds after refining final deoxygenation or Fruit storage, adds by rate of recovery 60-90%, samples total analysis after composition adjustment, and deficiency adds fine setting; Soft blow argon gas churning time>=8 minute, must not expose molten steel during stirring.
6. the production technique containing chromium cord steel as claimed in claim 3, it is characterized in that: adopt bloom or small billet cast, casting process adopts full guard cast, use high carbon steel covering slag, middle bag liquid level must not lower than 400mm, liquid level fluctuation of crystallizer within ± 8%, hot delivering technology of CC billets or wind sheltering cooling in heap or enter to cheat slow cooling; Described bloom is square billet or the square base of size >=200mm × 200mm, and described small billet is square billet or the square base of size < 200mm × 200mm.
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| WO2023056658A1 (en) * | 2021-10-08 | 2023-04-13 | 江阴兴澄合金材料有限公司 | Cord steel wire rod suitable for deep drawing and manufacturing method therefor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111655893A (en) * | 2018-01-30 | 2020-09-11 | 杰富意钢铁株式会社 | High carbon hot-rolled steel sheet and method for producing same |
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Application publication date: 20160217 |