CN103334016A - Method of controlling components of high-Ti-content and low-Al-content stainless steel by electroslag remelting in protective atmosphere - Google Patents
Method of controlling components of high-Ti-content and low-Al-content stainless steel by electroslag remelting in protective atmosphere Download PDFInfo
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Abstract
The invention discloses a method of controlling components of high-Ti-content and low-Al-content stainless steel by electroslag remelting in a protective atmosphere, in order to solve the problem that Ti and Al components fluctuate in an electroslag remelting process. The method adopts the following technical scheme that the method comprises the steps that (1) Ti and Al components of an electrode blank are controlled as follows: Ti is controlled according to an electroslag target component plus (0.15-0.30%), and Al is controlled to be 0.08-0.15%; (2), by adopting a ternary slag system that a ratio of CaF2 to Al2O3 to CaO is equal to 65:25:10, TiO2 powder is added at one time after slag charge is molten, and burning loss of Ti in an early smelting stage is reduced; (3), argon at a constant flow rate is adopted for protection in the electroslag remelting process, wherein the flow rate of argon is set to be 10-30L/min; and (4), constant melting speed control is adopted in the electroslag remelting process. Compared with the prior art, the method has the following advantages that Ti of an electroslag steel ingot reaches a target value; Al is controlled at the lower content; upper and lower components of the steel ingot are uniform; the burning loss quantity of Ti is reduced; and the production cost is lowered effectively.
Description
Technical field
The invention belongs to the electroslag remelting technique field, be specifically related to a kind of method of protective atmosphere esr high-Ti low-Al stainless steel Composition Control.
Background technology
Be the austenitic stainless steel of representative with 0Cr18Ni10Ti and be the duplex stainless steel of representative with 1Cr21Ni5Ti, 0Cr21Ni5Ti, because its superior corrosion resistance energy is widely used in industries such as Aeronautics and Astronautics, military project, the energy, petrochemical industry, machinery at present.Ti adds in this class stainless steel as stabilizing element, in order to the C element in the fixing steel, prevent the generation of sensitization attitude intergranular corrosion, thus in the technological standard all to Ti/C than strict requirement is arranged, be specially: Ti content is not less than 5 * (C-0.02) % or Ti content is not less than 5 * C%; Al adds and residues in the molten steel as the reductor in steel-making or the esr process.But because Ti and Al are strong ferrite former, too high amount can increase the ferrite content in the austenitic stainless steel, worsens its hot-workability and welding property; In addition, the Ti of too high amount and Al will make stainless crack sensitivity improve, and namely improve the brittle rupture tendency of steel.In view of Ti, the Al element above-mentioned characteristic in steel, home and abroad prior art standard is tight to further adding between the Composition Region of Ti element at present, and requires Al≤0.08%.Because the Ti element is very active, scaling loss and cause off analysis very easily in esr process.Domestic patent CN102071322A adopts at crystallizer and adds the scaling loss that argon protective device prevents Ti in the esr process, but be only applicable to the lower situation of Ti content (＜0.20%), production practice prove, can not reduce the scaling loss of Ti element effectively for the higher steel grade of Ti content; Domestic patent CN101736164A adopts and add the scaling loss that the Al powder prevents Ti in the esr process in the electroslag process, and the fluctuation of Ti composition is big and increase the Al phenomenon up and down but present method very easily causes ESR ingot.Therefore, for narrow between high Ti and Ti Composition Region, low Al stainless steel, still do not solve the problem of esr composition fluctuation fully at present.
Summary of the invention
The present invention discloses a kind of method of protective atmosphere esr high-Ti low-Al stainless steel Composition Control, Ti, Al composition fluctuation problem during with solution esr high-Ti low-Al stainless steel.
The present invention adopts following technical scheme:
(1) counter electrode base Ti, Al elementary composition are controlled as follows: the Ti element is pressed electroslag target component+(0.15%～0.30%) control; Add an amount of Al, it is finished from scaling loss in the electroslag process, reach the effect of protection Ti, the Al element is controlled 0.08%～0.15%.
(2) adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder, the scaling loss of minimizing smelting initial stage Ti element, TiO
2The add-on of powder is: Φ 330mm ingot shape adds 500g～1.5kg, and Φ 460mm ingot shape adds 1.5kg～2.5kg, and Φ 590mm ingot shape adds 2.5kg～3.5kg.
(3) esr process adopts the argon shield of constant rate, and whole smelting process is all carried out under identical protective atmosphere, makes Ti, Al melting loss of elements even, reduces fluctuation, and argon flow amount should be set in 10L/min～30L/min.
(4) esr process should adopt permanent molten speed control system, makes Ti, Al melting loss of elements even, reduces fluctuation, and melting rate is set at: Φ 330mm ingot shape is 5kg/min～6kg/min, and Φ 460mm, Φ 590mm ingot shape are 6.5kg/min～7.5kg/min.
Compared with prior art, the present invention has the following advantages:
Adopt electroslag remelting process of the present invention, composition was even about the Ti elemental composition of electroslag ingot reached target value and steel ingot, and the Al element is also controlled at lower content; Reduce the scaling loss amount of Ti element, effectively reduced production cost.
Embodiment
Embodiment 1
Adopt protective atmosphere esr 1Cr21Ni5Ti steel, ESR ingot is of a size of Φ 330mm, and this steel optimal components interval is: Ti:0.40%～0.60%, Al≤0.08%;
Electrode base chemical Composition Control is: Ti:0.71%, Al:0.10%; Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 700g; The constant 15L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 5.5 kg/min;
5 of ESR ingot chemical compositions distribute as follows from top to bottom behind the esr:
| The position | Ti（%） | Al（%） |
| The 1st point | 0.45 | 0.06 |
| The 2nd point | 0.50 | 0.05 |
| The 3rd point | 0.48 | 0.05 |
| The 4th point | 0.55 | 0.05 |
| The 5th point | 0.53 | 0.04 |
Embodiment 2
Adopt protective atmosphere esr 1Cr21Ni5Ti steel, ESR ingot is of a size of Φ 460mm, and this steel optimal components interval is: Ti:0.40%～0.60%, Al≤0.08%;
Electrode base chemical Composition Control is: Ti:0.73%, Al:0.09%.Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 2.0kg; The constant 20L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 6.5 kg/min;
5 of ESR ingot chemical compositions distribute as follows from top to bottom behind the esr:
| The position | Ti（%） | Al（%） |
| The 1st point | 0.48 | 0.06 |
| The 2nd point | 0.50 | 0.06 |
| The 3rd point | 0.52 | 0.04 |
| The 4th point | 0.55 | 0.05 |
| The 5th point | 0.56 | 0.04 |
Embodiment 3
Adopt protective atmosphere esr 1Cr21Ni5Ti steel, ESR ingot is of a size of Φ 590mm, and this steel optimal components interval is: Ti:0.40%-0.60%, Al≤0.08%;
Electrode base chemical Composition Control is: Ti:0.69%, Al:0.08%.Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 2.7Kg.The constant 25L/min that is set to of esr process argon flow amount.Esr process adopts permanent molten speed control system, and melting rate is 7.0Kg/min;
5 of ESR ingot chemical compositions distribute as follows from top to bottom behind the esr:
| The position | Ti（%） | Al（%） |
| The 1st point | 0.44 | 0.05 |
| The 2nd point | 0.48 | 0.03 |
| The 3rd point | 0.46 | 0.04 |
| The 4th point | 0.55 | 0.04 |
| The 5th point | 0.54 | 0.04 |
Embodiment 4
Adopt protective atmosphere esr 0Cr21Ni5Ti steel, ESR ingot is of a size of Φ 590mm, and this steel optimal components interval is: Ti:0.30%～0.45%, Al≤0.08%;
Electrode base chemical Composition Control is: Ti:0.60%, Al:0.09%.Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 2.9Kg.The constant 25L/min that is set to of esr process argon flow amount.Esr process adopts permanent molten speed control system, and melting rate is 7.0Kg/min;
5 of ESR ingot chemical compositions distribute as follows from top to bottom behind the esr:
| The position | Ti（%） | Al（%） |
| The 1st point | 0.34 | 0.06 |
| The 2nd point | 0.38 | 0.06 |
| The 3rd point | 0.40 | 0.04 |
| The 4th point | 0.42 | 0.05 |
| The 5th point | 0.40 | 0.04 |
Embodiment 5
Adopt protective atmosphere esr 0Cr18Ni10Ti steel, ESR ingot is of a size of Φ 590mm, and this steel optimal components interval is: Ti:0.30%-0.45%, Al≤0.08%;
Electrode base chemical Composition Control is: Ti:0.56%, Al:0.08%.Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 3.0Kg.The constant 25L/min that is set to of esr process argon flow amount.Esr process adopts permanent molten speed control system, and melting rate is 7.0Kg/min;
5 of ESR ingot chemical compositions distribute as follows from top to bottom behind the esr:
| The position | Ti（%） | Al（%） |
| The 1st point | 0.35 | 0.06 |
| The 2nd point | 0.39 | 0.05 |
| The 3rd point | 0.39 | 0.05 |
| The 4th point | 0.40 | 0.05 |
| The 5th point | 0.42 | 0.04 |
Claims (6)
1. the method for a protective atmosphere esr high-Ti low-Al stainless steel Composition Control is characterized in that:
(1) counter electrode base Ti, Al elementary composition are controlled as follows: the Ti element is pressed electroslag target component+(0.15%～0.30%) control; Add an amount of Al, it is finished from scaling loss in the electroslag process, reach the effect of protection Ti, the Al element is controlled 0.08%～0.15%;
(2) adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder, the scaling loss of minimizing smelting initial stage Ti element, TiO
2The add-on of powder is: Φ 330mm ingot shape adds 500g～1.5kg, and Φ 460mm ingot shape adds 1.5kg～2.5kg, and Φ 590mm ingot shape adds 2.5kg～3.5kg;
(3) esr process adopts the argon shield of constant rate, and whole smelting process is all carried out under identical protective atmosphere, makes Ti, Al melting loss of elements even, reduces fluctuation, and argon flow amount should be set in 10L/min～30L/min;
(4) esr process should adopt permanent molten speed control system, makes Ti, Al melting loss of elements even, reduces fluctuation, and melting rate is set at: Φ 330mm ingot shape is 5kg/min～6kg/min, and Φ 460mm, Φ 590mm ingot shape are 6.5kg/min～7.5kg/min.
2. the method for protective atmosphere esr high-Ti low-Al stainless steel Composition Control according to claim 1 is characterized in that: adopt protective atmosphere esr 1Cr21Ni5Ti steel, ESR ingot is of a size of Φ 330mm; Electrode base chemical Composition Control is: Ti:0.71%, Al:0.10%; Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 700g; The constant 15L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 5.5 kg/min.
3. the method for protective atmosphere esr high-Ti low-Al stainless steel Composition Control according to claim 1 is characterized in that: adopt protective atmosphere esr 1Cr21Ni5Ti steel, ESR ingot is of a size of Φ 460mm; Electrode base chemical Composition Control is: Ti:0.73%, Al:0.09%; Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 2.0kg; The constant 20L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 6.5 kg/min.
4. the method for protective atmosphere esr high-Ti low-Al stainless steel Composition Control according to claim 1 is characterized in that: adopt protective atmosphere esr 1Cr21Ni5Ti steel, ESR ingot is of a size of Φ 590mm; Electrode base chemical Composition Control is: Ti:0.69%, Al:0.08%; Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 2.7Kg;
The constant 25L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 7.0Kg/min.
5. the method for protective atmosphere esr high-Ti low-Al stainless steel Composition Control according to claim 1 is characterized in that: adopt protective atmosphere esr 0Cr21Ni5Ti steel, ESR ingot is of a size of Φ 590mm; Electrode base chemical Composition Control is: Ti:0.60%, Al:0.09%; Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 2.9Kg;
The constant 25L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 7.0Kg/min.
6. the method for protective atmosphere esr high-Ti low-Al stainless steel Composition Control according to claim 1 is characterized in that: adopt protective atmosphere esr 0Cr18Ni10Ti steel, ESR ingot is of a size of Φ 590mm; Electrode base chemical Composition Control is: Ti:0.56%, Al:0.08%; Adopt CaF
2: Al
2O
3: the ternary slag system of CaO=65:25:10, disposable adding TiO immediately after slag charge fusing finishes
2Powder 3.0Kg; The constant 25L/min that is set to of esr process argon flow amount; Esr process adopts permanent molten speed control system, and melting rate is 7.0Kg/min.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925814A (en) * | 2016-06-24 | 2016-09-07 | 东北大学 | Method for smelting high-nitrogen austentite stainless steel through pressurized electroslag remelting gas nitriding |
| CN109457119A (en) * | 2018-11-26 | 2019-03-12 | 抚顺特殊钢股份有限公司 | A kind of simple method of controlling of titanium alloy vacuum consumable melting current voltage matches |
| CN111057932A (en) * | 2019-12-02 | 2020-04-24 | 抚顺特殊钢股份有限公司 | Ultrapure smelting method for low-aluminum 1300MPa grade high-strength steel |
| CN112458303A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Low-carbon ultralow-titanium high-strength steel ultrapure smelting process |
| CN113832353A (en) * | 2021-09-15 | 2021-12-24 | 山西太钢不锈钢股份有限公司 | Electroslag smelting process for low-silicon, low-nitrogen and high-aluminum steel |
| CN115109937A (en) * | 2022-06-16 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Electroslag remelting method for effectively controlling N08810 aluminum-titanium component |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925814A (en) * | 2016-06-24 | 2016-09-07 | 东北大学 | Method for smelting high-nitrogen austentite stainless steel through pressurized electroslag remelting gas nitriding |
| CN109457119A (en) * | 2018-11-26 | 2019-03-12 | 抚顺特殊钢股份有限公司 | A kind of simple method of controlling of titanium alloy vacuum consumable melting current voltage matches |
| CN111057932A (en) * | 2019-12-02 | 2020-04-24 | 抚顺特殊钢股份有限公司 | Ultrapure smelting method for low-aluminum 1300MPa grade high-strength steel |
| CN112458303A (en) * | 2020-11-02 | 2021-03-09 | 抚顺特殊钢股份有限公司 | Low-carbon ultralow-titanium high-strength steel ultrapure smelting process |
| CN113832353A (en) * | 2021-09-15 | 2021-12-24 | 山西太钢不锈钢股份有限公司 | Electroslag smelting process for low-silicon, low-nitrogen and high-aluminum steel |
| CN115109937A (en) * | 2022-06-16 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Electroslag remelting method for effectively controlling N08810 aluminum-titanium component |
| CN115109937B (en) * | 2022-06-16 | 2023-09-05 | 山西太钢不锈钢股份有限公司 | Electroslag remelting method for effectively controlling N08810 aluminum titanium components |
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Inventor after: Xu Peng Inventor after: Wang Haijiang Inventor after: Sun Changliang Inventor after: Guan Xudong Inventor after: Zhang Xiaolei Inventor after: Yu Dan Inventor after: Wang Jihong Inventor after: Lu Lun Inventor after: Zhang Xiuli Inventor after: Han Tao Inventor after: Sun Lijun Inventor after: Zhang Lina Inventor after: Chen Deli Inventor after: Gu Qiang Inventor before: Xu Peng Inventor before: Wang Haijiang Inventor before: Sun Changliang Inventor before: Guan Xudong Inventor before: Zhang Xiaolei Inventor before: Yu Dan Inventor before: Wang Jihong Inventor before: Lu Lun Inventor before: Zhang Xiuli Inventor before: Han Tao Inventor before: Sun Lijun Inventor before: Zhang Lina Inventor before: Chen Deli Inventor before: Gu Qiang |
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Application publication date: 20131002 |