CN109735682A - The smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying - Google Patents

The smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying Download PDF

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Publication number
CN109735682A
CN109735682A CN201811553368.5A CN201811553368A CN109735682A CN 109735682 A CN109735682 A CN 109735682A CN 201811553368 A CN201811553368 A CN 201811553368A CN 109735682 A CN109735682 A CN 109735682A
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high nitrogen
composite alloy
refining
screw
steel
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孙江波
孙彩凤
翟晓毅
徐斌
肖国华
李海斌
任根柱
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Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
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Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
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Abstract

The present invention relates to refining, LF refining and continuous casting working procedures at the beginning of a kind of smelting process of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying, including converter;White slag is made in the LF refining process, refining, and high nitrogen composite alloy, 4~7min of soft blow after high nitrogen composite alloy is added is added in temperature after adjusting.The present invention uses the existing vanadium system alloy of high nitrogen combined microalloying replacing whole, while to converter, just refining, LF refining and continuous casting working procedure are rationally controlled, and reduce alloying cost, final to realize the purpose that screw-thread steel production cost is greatly reduced.

Description

The smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying
Technical field
The invention belongs to Ferrous Metallurgy micro-alloying technology fields, and in particular to a kind of high nitrogen composite alloy microalloying The smelting process of 400MPa grades of screw-thread steels.
Background technique
2018, new national standard " concrete reinforcement steel (GB/T1499.2-2018) " was formally implemented, and new standard requires reinforcing bar Cross-sectional circumference does not allow the ring for occurring being different from internal contrast, therefore limits the production for wearing water reinforcing bar to a certain extent, respectively Steel mill starts to carry out screw-thread steel production using traditional vanadium microalloy technology, and vanadium system alloy demand sharply increases, in addition, due to state The reinforcement of the environmentally friendly renovation dynamics of family, vanadium system alloy resource is in short supply, and vanadium system alloy price is caused to rise sharply.
To reduce screw-thread steel production cost, the specific method that each steel mill uses at present includes: 1. to continue to use V microalloying Mode, but appropriate drop vanadium increases manganese, reduces cost of alloy with this;The method technology maturation, quality stablize, but can only reduce alloy at This 30 yuan/ton, it is little that this space drops;2. using Nb-V combined microalloying mode, 80 yuan/ton of cost of alloy can be reduced, there is one This space of fixed drop;3. using Nb microalloying mode, but there are casting blank cracks serious, steel bar stretching is without yield point elongation, tissue There are the quality risks such as excessive bainite.
The patent application of Publication No. CN1952199A disclose it is a kind of " niobium titanium-combined microalloying and Its production method " mainly uses niobium titanium-combined microalloying, but content of niobium control more a height of 0.020~0.050%, is produced into This is still higher, and Control of Nitrogen Content is≤0.008%, and is needed after rolling using being quickly cooled down, and production difficulty is larger and not easily-controllable System.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying Smelting process, using the existing vanadium system alloy of high nitrogen combined microalloying replacing whole, at the same to converter just refine, LF refining and Continuous casting working procedure rationally controls, and reduces alloying cost, final to realize the purpose that screw-thread steel production cost is greatly reduced.
In order to solve the above technical problems, the technical solution used in the present invention is:
Refining, LF refining and continuous casting work at the beginning of the smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, including converter Sequence;White slag is made in the LF refining process, refining, and high nitrogen composite alloy is added in temperature after adjusting, high nitrogen composite alloy is added 4~7min of soft blow afterwards.
The smelting process of above-mentioned high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, the LF refining process carry out White slag processing, LF strong Argon after entering the station, 80~100 Nm3/h of argon flow, and lime 3~5Kg/t steel is added, fluorite 0.5~ 2~5Kg/t of lime steel is added in temperature-rise period in 0.8Kg/t steel, later feeding temperature-raising.
The smelting process of above-mentioned high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, in the refining procedure, when After LF furnace temperature rises to 1570~1585 DEG C, molten steel composition micro-adjustment is carried out, reaches ladle molten steel component: C 0.18~0.25 Wt%, Si 0.40~0.80 wt%, Mn 1.30~1.60 wt%, S≤0.045 wt%;Molten steel temperature is adjusted to satisfaction afterwards and is connected 15~35 DEG C of the packet degree of superheat in casting requirement, high nitrogen composite alloy 1.6~3.2kg/t steel is added.
The smelting process of above-mentioned high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, the LF refining process are high After nitrogen composite alloy is added, it is desirable that 4~7min of soft blow time, to reach the uniform purpose of ladle ingredient, ladle molten steel at Divide Ti:0.010~0.040 wt%, N:0.0090~0.0150wt%.
The smelting process of above-mentioned high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, the converter just refine process, The control of molten steel terminal C content is in 0.10~0.20wt%, P≤0.045wt%, in tapping process using ferrosilicon, fero-manganesesilicon, ferro-niobium into Row deoxidation alloying, make ladle molten steel component reach C:0.15~0.20 wt%, Si:0.30~0.45 wt%, Mn:1.20~ 1.40 wt%, Nb: 0.010~0.035 wt%.
The smelting process of above-mentioned high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, the billet continuous casting process, It is poured using whole process protection, tundish low overheat controls 15~35 DEG C, and each stream takes permanent pulling rate to operate, casting speed control 2.2 ~2.4m/min, each stream take in cold intensity of cooling, two cold 0.75~0.85L/kg of intensity of cooling.
Using continuous casting billet produced by the invention, the ratio that 1.5 grades of middle crack > is less than or equal to 0.5%;To the continuous casting billet into Row rolling, it is cooling after be made the screw-thread steel finished product of 12~Φ of specification Φ 36mm, Nb:0.010~0.040wt% in the screw-thread steel, The wt% of wt%, N:0.0090~0.0150 of Ti:0.010~0.040, stable mechanical property fully meet national standard.
The invention has the benefit that
Compared with prior art, the present invention adds niobium, titanium and suitable nitrogen member by using high nitrogen combined microalloying technique Element plays niobium, titanium, nitrogen complex intensifying mechanism, can reduce ferro-niobium additional amount, replacing whole vanadium system alloy, and cost can reduce by 110~ 180 yuan/ton of steel are controlled by reasonable converter smelting, refinery practice and continuous casting process, slab centre and centre burst ratio Example significantly reduces, and the ratio that 1.5 grades of middle crack > is less than or equal to 0.5%, significantly reduces alloying cost.It is produced by the invention Continuous casting billet, applicable spiral rolling specs range is big, spiral stable mechanical property, metallographic structure ferrite+pearlite Ratio >=90%;In addition be not required in the operation of rolling through it is too strong wear water and be quickly cooled down refine crystal grain, to the Capability Requirement of control-cooling equipment It is lower, it is suitble to stable mass production.
Specific embodiment
The present invention is further illustrated below by Examples 1 to 5.
Embodiment 1:
The smelting process of the present embodiment high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, including converter is just refined, LF furnace essence Refining and billet continuous casting process, specific process step are as described below:
(1) converter just refines process: it is blown using 100 tons of converters, plan tapping 110t, tap molten steel component C:0.10wt%, Ferro-niobium 0.32kg/t steel and carbon dust, silicomangan, ferrosilicon, ladle molten steel is added to ladle in tapping process in P:0.045wt% Ingredient C:0.15wt%, Si:0.30wt%, Mn:1.20wt%, Nb: 0.015wt%;
(2) LF refining process: first turning on steel ladle bottom argon blowing, and lime 4Kg/t steel, fluorite 0.5Kg/t is added in flow 100Nm3/h Lime 3Kg/t steel is added in temperature-rise period, it is ensured that clinker white slag simultaneously has good mobility, adjusts in steel, later feeding temperature-raising Then whole temperature adjusts ladle molten steel component and reaches C:0.25wt%, Si:0.48wt%, Mn:1.60wt%, S to 1580 DEG C: 0.018wt%;
Continue to adjust temperature to 1583 DEG C, high nitrogen composite alloy 1.6kg/t steel is added, high nitrogen composite alloy requires after being added The soft blow time 5 minutes, ladle molten steel component Ti:0.010 wt%, N:0.0090 wt%;
(3) billet continuous casting process: whole process protection pouring technology, the tundish degree of superheat control 20 DEG C, and each casting speed control that flows is 2.3m/ Min, two cold intensity of cooling 0.75L/kg.
187 yuan/ton of steel of cost of alloy can be reduced using the present embodiment production screw-thread steel, slab low power shows that middle crack is commented 0.5 grade of grade uses slab production trimmed size for the screw-thread steel of Φ 12mm, yield strength 442MPa, tensile strength 644MPa, Elongation after fracture 25%, maximum, force breaking elongation 15%, strong flexor ratio 1.45, back-flexing is qualified, ferrite+pearlite ratio 93%.
Embodiment 2
The smelting process of the present embodiment high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying includes that converter is just refined, LF furnace refines With billet continuous casting process, specific process step is as described below:
(1) converter just refines process: being blown using 100 tons of converters, plan tapping 110t, tap molten steel component C:0.20 Ferro-niobium 0.65kg/t steel and carbon dust, silicomangan, ferrosilicon, steel is added to ladle in tapping process in wt%, P:0.023 wt% Packet molten steel component C:0.16 wt %, Si:0.40 wt %, Mn:1.25 wt%, Nb: 0.040 wt%;
(2) LF refining process: first turning on steel ladle bottom argon blowing, and lime 5Kg/t steel, fluorite 0.8Kg/t is added in flow 100Nm3/h Lime 5Kg/t steel is added in temperature-rise period, it is ensured that clinker white slagization has good mobility in steel, later feeding temperature-raising.Adjustment Then temperature adjusts ladle molten steel component and reaches C:0.18 wt%, Si:0.40 wt%, Mn:1.30 wt%, S to 1575 DEG C: 0.045 wt%;
Continue to adjust temperature to 1585 DEG C, high nitrogen composite alloy 1.6kg/t steel is added, high nitrogen composite alloy requires after being added The soft blow time 4 minutes, ladle molten steel component Ti:0.012 wt%, N:0.0103 wt%;
(3) billet continuous casting process: whole process protection pouring technology, the tundish degree of superheat control 35 DEG C, and each casting speed control that flows is 2.2m/ Min, two cold intensity of cooling 0.80L/kg.
127 yuan/ton of steel of cost of alloy can be reduced using the screw-thread steel that the present embodiment produces, slab low power shows middle crack 1.0 grades of grading uses slab production trimmed size for the screw-thread steel of Φ 14mm, yield strength 437MPa, tensile strength 633MPa, elongation after fracture 28%, maximum, force breaking elongation 15%, strong flexor ratio 1.44, back-flexing is qualified, ferrite+pearlite Ratio 95%.
Embodiment 3
The smelting process of the present embodiment high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying includes that converter is just refined, LF furnace refines With billet continuous casting process, specific process step is as described below:
(1) converter just refines process: being blown using 100 tons of converters, plan tapping 110t, tap molten steel component C:0.14 wt Ferro-niobium 0.16kg/t steel and carbon dust, silicomangan, ferrosilicon, ladle is added to ladle in tapping process in %, P:0.027 wt % Molten steel component C:0.18 wt%, Si:0.40 wt%, Mn:1.30 wt%, Nb: 0.010 wt%;
(2) LF refining process: first turning on steel ladle bottom argon blowing, and lime 3Kg/t steel, fluorite 0.5Kg/t is added in flow 80Nm3/h Lime 5Kg/t steel is added in temperature-rise period, it is ensured that clinker white slagization has good mobility in steel, later feeding temperature-raising.Adjustment Then temperature adjusts ladle molten steel component and reaches C:0.25 wt%, Si:0.48 wt%, Mn:1.40 wt%, S to 1585 DEG C: 0.030 wt%;
Continue to adjust temperature to 1575 DEG C, high nitrogen composite alloy 3.2kg/t steel is added, high nitrogen composite alloy requires after being added The soft blow time 7 minutes, ladle molten steel component Ti:0.040 wt%, N:0.0150 wt%;
(3) billet continuous casting process: whole process protection pouring technology, the tundish degree of superheat control 15 DEG C, and each casting speed control that flows is 2.4m/ Min, two cold intensity of cooling 0.85L/kg.
110 yuan/ton of steel of cost of alloy can be reduced using the screw-thread steel that the present embodiment produces, slab low power shows middle crack 1.5 grades of grading uses slab production trimmed size for the screw-thread steel of Φ 22mm, yield strength 435MPa, tensile strength 635MPa, elongation after fracture 27.5%, maximum, force breaking elongation 16.5%, strong flexor ratio 1.45, back-flexing is qualified, ferrite+pearl Body of light ratio 91%.
Embodiment 4
The smelting process of the present embodiment high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying includes that converter is just refined, LF furnace refines With billet continuous casting process, specific process step is as described below:
(1) converter just refines process: being blown using 100 tons of converters, plan tapping 110t, tap molten steel component C:0.16 Ferro-niobium 0.20kg/t steel and carbon dust, silicomangan, ferrosilicon, steel is added to ladle in tapping process in wt%, P:0.020 wt% Packet molten steel component C:0.18 wt%, Si:0.35 wt%, Mn:1.40 wt%, Nb: 0.015 wt%;
(2) LF refining process: first turning on steel ladle bottom argon blowing, and lime 5Kg/t steel, fluorite 0.6Kg/t is added in flow 100Nm3/h Lime 2Kg/t steel is added in temperature-rise period, it is ensured that clinker white slagization has good mobility in steel, later feeding temperature-raising.Adjustment Then temperature adjusts ladle molten steel component and reaches C:0.20 wt%, Si:0.40 wt%, Mn:1.60 wt%, S to 1580 DEG C: 0.020 wt%;
Continue to adjust temperature to 1583 DEG C, high nitrogen composite alloy 3.0kg/t steel is added, high nitrogen composite alloy requires after being added The soft blow time 6 minutes, ladle molten steel component Ti:0.035 wt%, N:0.0140 wt%;
(3) billet continuous casting process: whole process protection pouring technology, the tundish degree of superheat control 35 DEG C, and each casting speed control that flows is 2.2m/ Min, two cold intensity of cooling 0.80L/kg.
117 yuan/ton of steel of cost of alloy can be reduced using the screw-thread steel that the present embodiment produces, slab low power shows middle crack 0.5 grade of grading uses slab production trimmed size for the screw-thread steel of Φ 25mm, yield strength 452MPa, tensile strength 645MPa, elongation after fracture 22.5%, maximum, force breaking elongation 15.5%, strong flexor ratio 1.42, back-flexing is qualified, ferrite+pearl Body of light ratio 97%.
Embodiment 5
The smelting process of the present embodiment high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying includes that converter is just refined, LF furnace refines With billet continuous casting process, specific process step is as described below:
(1) converter just refines process: it is blown using 100 tons of converters, plan tapping 110t, tap molten steel component C:0.10wt%, Ferro-niobium 0.50kg/t steel and carbon dust, silicomangan, ferrosilicon, ladle molten steel is added to ladle in tapping process in P:0.027wt% Ingredient C:0.12wt%, Si:0.35wt%, Mn:1.28wt%, Nb: 0.025wt%;
(2) LF refining process: first turning on steel ladle bottom argon blowing, and lime 5Kg/t steel, fluorite 0.6Kg/t is added in flow 100Nm3/h Lime 4Kg/t steel is added in temperature-rise period, it is ensured that clinker white slagization has good mobility in steel, later feeding temperature-raising.Adjustment Then temperature adjusts ladle molten steel component and reaches C:0.23wt%, Si:0.80wt%, Mn:1.48wt%, S to 1570 DEG C: 0.018wt%;
Continue to adjust temperature to 1575 DEG C, high nitrogen composite alloy 2.0kg/t steel is added, high nitrogen composite alloy requires after being added The soft blow time 5 minutes, ladle molten steel component Ti:0.025wt%, N:0.0126 wt%;
(3) billet continuous casting process: whole process protection pouring technology, the tundish degree of superheat control 25 DEG C, and each casting speed control that flows is 2.4m/ Min, two cold intensity of cooling 0.82L/kg.
146 yuan/ton of steel of cost of alloy can be reduced using the screw-thread steel that the present embodiment produces, slab low power shows middle crack 1.0 grades of grading uses slab production trimmed size for the screw-thread steel of Φ 36mm, yield strength 434MPa, tensile strength 636MPa, elongation after fracture 24.5%, maximum, force breaking elongation 15.5%, strong flexor ratio 1.46, back-flexing is qualified, ferrite+pearl Body of light ratio 96%.

Claims (6)

1. refining, LF refining and continuous casting at the beginning of the smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying, including converter Process;It is characterized by: the LF refining process, white slag is made in refining, and high nitrogen composite alloy, high nitrogen is added after adjusting in temperature 4~7min of soft blow after composite alloy is added.
2. the smelting process of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying as described in claim 1, feature exist In: the LF refining process carries out white slag processing, LF strong Argon after entering the station, 80~100 Nm3/h of argon flow, and stone is added 2~5Kg/t of lime steel is added in temperature-rise period in ash 3~5Kg/t steel, fluorite 0.5~0.8Kg/t steel, later feeding temperature-raising.
3. the smelting process of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying as claimed in claim 2, feature exist In: in the refining procedure, after LF furnace temperature rises to 1570~1585 DEG C, molten steel composition micro-adjustment is carried out, ladle molten steel is made Ingredient reaches: C 0.18~0.25 wt%, Si 0.40~0.80 wt%, Mn 1.30~1.60 wt%, S≤0.045 wt%;Afterwards Molten steel temperature is adjusted to 15~35 DEG C of the packet degree of superheat in continuous casting requirement are met, 1.6~3.2kg/t of high nitrogen composite alloy is added Steel.
4. the smelting process of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying as claimed in claim 3, feature exist In: the LF refining process, after high nitrogen composite alloy is added, it is desirable that and 4~7min of soft blow time, it is equal to reach ladle ingredient Even purpose, ladle molten steel component Ti:0.010~0.040 wt%, N:0.0090~0.0150wt%.
5. the smelting process of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying as described in claim 1, feature exist In: process is just refined in the converter, and molten steel terminal C content is controlled adopts in 0.10~0.20wt%, P≤0.045wt%, tapping process Deoxidation alloying is carried out with ferrosilicon, fero-manganesesilicon, ferro-niobium, ladle molten steel component is made to reach the wt of C:0.15~0.20 %, Si:0.30 ~0.45 wt wt of %, Mn:1.20~1.40 %, Nb: 0.010~0.035 wt %.
6. the smelting process of 400MPa grades of screw-thread steels of high nitrogen composite alloy microalloying as described in claim 1, feature exist In: the billet continuous casting process is poured using whole process protection, and tundish low overheat controls 15~35 DEG C, and each stream takes permanent drawing Speed operation, casting speed control be 2.2~2.4m/min, each stream take in cold intensity of cooling, two cold 0.75~0.85L/ of intensity of cooling kg。
CN201811553368.5A 2018-12-18 2018-12-18 The smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying Withdrawn CN109735682A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110257719A (en) * 2019-08-02 2019-09-20 武汉钢铁集团鄂城钢铁有限责任公司 A kind of micro-alloyed with Nb and Ti HRB400 grades of screw-thread steels and its manufacturing method
CN110885952A (en) * 2019-12-16 2020-03-17 本钢板材股份有限公司 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof
CN111041369A (en) * 2019-12-26 2020-04-21 芜湖新兴铸管有限责任公司 Nb-Ti-N microalloyed hot-rolled ribbed steel bar and production method thereof
CN111187969A (en) * 2020-02-17 2020-05-22 本钢板材股份有限公司 Production method of 400 MPa-level niobium-nitrogen microalloyed twisted steel
CN114619007A (en) * 2022-02-14 2022-06-14 包头钢铁(集团)有限责任公司 Production method of low-alloy high-nitrogen steel continuous casting billet

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CN107723605A (en) * 2017-11-30 2018-02-23 攀钢集团攀枝花钢铁研究院有限公司 Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy
CN107815608A (en) * 2017-11-30 2018-03-20 攀钢集团攀枝花钢铁研究院有限公司 Microalloy containing Ti builds Steel Bar and its LF stove production methods

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Publication number Priority date Publication date Assignee Title
CN107723605A (en) * 2017-11-30 2018-02-23 攀钢集团攀枝花钢铁研究院有限公司 Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy
CN107815608A (en) * 2017-11-30 2018-03-20 攀钢集团攀枝花钢铁研究院有限公司 Microalloy containing Ti builds Steel Bar and its LF stove production methods

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110257719A (en) * 2019-08-02 2019-09-20 武汉钢铁集团鄂城钢铁有限责任公司 A kind of micro-alloyed with Nb and Ti HRB400 grades of screw-thread steels and its manufacturing method
CN110885952A (en) * 2019-12-16 2020-03-17 本钢板材股份有限公司 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof
CN111041369A (en) * 2019-12-26 2020-04-21 芜湖新兴铸管有限责任公司 Nb-Ti-N microalloyed hot-rolled ribbed steel bar and production method thereof
CN111187969A (en) * 2020-02-17 2020-05-22 本钢板材股份有限公司 Production method of 400 MPa-level niobium-nitrogen microalloyed twisted steel
CN114619007A (en) * 2022-02-14 2022-06-14 包头钢铁(集团)有限责任公司 Production method of low-alloy high-nitrogen steel continuous casting billet
CN114619007B (en) * 2022-02-14 2024-03-08 包头钢铁(集团)有限责任公司 Production method of low-alloy high-nitrogen steel continuous casting blank

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