CN102787216A - Method for producing non-quenched and tempered N80 1 steel by nitrogen content control - Google Patents
Method for producing non-quenched and tempered N80 1 steel by nitrogen content control Download PDFInfo
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- CN102787216A CN102787216A CN201110403461XA CN201110403461A CN102787216A CN 102787216 A CN102787216 A CN 102787216A CN 201110403461X A CN201110403461X A CN 201110403461XA CN 201110403461 A CN201110403461 A CN 201110403461A CN 102787216 A CN102787216 A CN 102787216A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for producing a non-quenched and tempered N80 1 steel by nitrogen content control, which comprises the following steps: the LF slag smelting is stabilized, the weight and the components of the molten slag are controllable, in the VD packing process and after VD emptying, the proper nitrogen flushing time, flow and pressure are respectively employed, so that the nitrogen content is stable and controllable. According to the method of the invention, the non-quenched and tempered treatment requirements of the nitrogen content in the steel can completely satisfied, the surface cracks of the casting billet can be effectively reduced, the surface cracks of the casting billet is reduced from 81.3% to 98%, and the qualified rate of the products is increased from 85.6% to 99.4%. The content of nitrogen in steel is increased by nitrogen purging so as to save the hypervalent nitrogen-containing alloy usage, and the production cost can be reduced.
Description
Technical field
The invention belongs to the smelting iron and steel technology field, relate in particular to a kind of method of really controlling nitrogen in steel content based on vacuum refining furnace (being called for short the VD stove) refinery practice production non-quenched and tempered N 80 1 aluminium.
Background technology
At present; 1 grade of petroleum pipeline steel of domestic production N80 generally adopts the modifier treatment mode to produce, and its operational path also generally adopts the production process route of hot metal pretreatment-converter smelting-ladle refining furnace (being called for short the LF stove) refining-VD stove refining-nitrogen-containing alloy nitrogen pick-up-billet continuous casting-hot continuous rolling.Because this mode of production operation is various, so production cost is higher.And adopt non-modified mode to produce, then need add V-Ti or vanadium iron and add nitrogen flushing technology and control, to guarantee vanadium, nitrogen content in the steel.Adopt the mode that adds V-Ti to produce, its cost is higher, and yield of alloy is unstable.Though it is lower that the mode that adopts vanadium iron to add nitrogen flushing technology is produced cost, owing to take nitrogen flushing technology in ladle, thereby the nitrogen content in the steel is difficult to stable control.
Because N80 1 steel requires in the steel higher ［ N ］, ［ V ］ content to be arranged; Causing on crystal boundary thus has ［ VDC ］ compound to separate out; Thereby destroyed the continuity of crystal boundary; Cause grain-boundary weakness, can take place under external force the cracking and cause product crackle to occur, bring very big influence to quality product.Therefore, should guarantee the nitrogen content requirement of N80 1 steel after the non-modifier treatment, can effectively reduce slab surface crack again, make it satisfy the quality product requirement, the nitrogen content in just must strict control steel.
Summary of the invention
The object of the invention aims to provide a kind of nitrogen content requirement that both can guarantee non-modifier treatment, can effectively reduce slab surface crack again, and production non-quenched and tempered N 80 1 aluminium that improves the quality of products is really controlled the method for nitrogen in steel content.
For this reason, the present invention has taked following solution in time:
A kind of method of producing non-quenched and tempered N 80 1 steel control nitrogen content is characterized in that:
(1), operational path:
Adopt hot metal pretreatment-top blown converter smelting-converter tapping to skim-operational path of LF refining-VD refining-nitrogen flushing processing-billet continuous casting-hot continuous rolling;
(2), LF slag making:
The slag charge add-on is a 0.38-0.46kg/ ton steel, and R is controlled at 2.6-3.5;
Adopt the silicon deoxidation, ［ O ］≤15ppm in the control steel;
(3) VD refining:
In a, the VD pressure maintaining period:
Nitrogen flushing flow is controlled at steel 2.0-3.0Nl/min per ton, and pressure-controlling is at 0.2MPa;
The nitrogen flushing time is set according to nitrogen in steel content, and steel per ton calculates the nitrogen flushing time according to 3.0-4.0 ppm/ min;
B, the broken empty back of VD:
Nitrogen flushing flow is controlled at steel 1.2-1.8Nl/min per ton, and pressure-controlling is at 0.15MPa;
The nitrogen flushing time is set according to nitrogen in steel content, and steel per ton calculates the nitrogen flushing time according to 6.0-7.0 ppm/ min;
The control inclusion fully floated when the nitrogen in steel weight percent content reached 0.005-0.020%.
Beneficial effect of the present invention is:
Adopt the inventive method to produce non-quenched and tempered N 80 1 steel, the nitrogen content stable and controllable satisfies the requirement of non-modifier treatment fully, effectively reduces slab surface crack, makes slab surface crack be reduced to 98% by 81.3%, and the quality product qualification rate brings up to 99.4% by 85.6%.
Because the present invention increases the nitrogen content in the steel through nitrogen flushing, thereby can practice thrift the usage quantity of high price nitrogen-containing alloy, reduce production costs.Simultaneously, adopt high pressure nitrogen to substitute argon gas, need not extra increase cost as lift gas.
Embodiment
Embodiment 1: produce non-quenched and tempered N 80 1 steel.
1, production process route:
Adopt hot metal pretreatment-top blown converter smelting-converter tapping to skim-operational path of LF refining-VD refining-nitrogen flushing processing-billet continuous casting-hot continuous rolling.
2, LF slag making:
Stablize LF slag making operation, make slag weight, controllable components, the process nitrogen flushing is in stable condition.
Steel per ton adds slag charge 0.40kg, and basicity is controlled at 2.6;
Adopt the silicon deoxidation, ［ O ］ is at 10ppm in the control steel.
3, VD refining:
In a, the VD pressure maintaining period:
Nitrogen flushing flow is controlled at steel 2.3Nl/min per ton, and pressure-controlling is at 0.2MPa;
Set the nitrogen flushing time according to nitrogen in steel content, steel per ton goes out the nitrogen flushing time according to 3.0ppm/ min inverse.
B, the broken empty back of VD:
Nitrogen flushing flow is controlled at steel 1.8Nl/min per ton, and pressure-controlling is at 0.15MPa;
Set the nitrogen flushing time according to nitrogen in steel content, steel per ton calculates the nitrogen flushing time according to 6.8ppm/ min;
When the nitrogen in steel weight percent content reaches 0.017%, guarantee that inclusion fully floats.
Embodiment 2: produce non-quenched and tempered N 80 1 steel.
1, production process route:
Adopt hot metal pretreatment-top blown converter smelting-converter tapping to skim-operational path of LF refining-VD refining-nitrogen flushing processing-billet continuous casting-hot continuous rolling.
2, LF slag making:
Stablize LF slag making operation, make slag weight, controllable components, the process nitrogen flushing is in stable condition.
Steel per ton adds slag charge 0.45kg, and basicity is controlled at 3.3;
Adopt the silicon deoxidation, ［ O ］ is at 12ppm in the control steel.
3, VD refining:
In a, the VD pressure maintaining period:
Nitrogen flushing flow is controlled at steel 3.0Nl/min per ton, and pressure-controlling is at 0.2MPa;
Set the nitrogen flushing time according to nitrogen in steel content, steel per ton goes out the nitrogen flushing time according to 3.8ppm/ min inverse.
B, the broken empty back of VD:
Nitrogen flushing flow is controlled at steel 1.4Nl/min per ton, and pressure-controlling is at 0.15MPa;
Set the nitrogen flushing time according to nitrogen in steel content, steel per ton calculates the nitrogen flushing time according to 6.2ppm/ min;
When the nitrogen in steel weight percent content reaches 0.008%, guarantee that inclusion fully floats.
Claims (1)
1. produce the method that non-quenched and tempered N 80 1 steel is controlled nitrogen content for one kind, it is characterized in that:
(1), operational path:
Adopt hot metal pretreatment-top blown converter smelting-converter tapping to skim-operational path of LF refining-VD refining-nitrogen flushing processing-billet continuous casting-hot continuous rolling;
(2), LF slag making:
The slag charge add-on is a 0.38-0.46kg/ ton steel, and basicity is controlled at 2.6-3.5;
Adopt the silicon deoxidation, ［ O ］≤15ppm in the control steel;
(3) VD refining:
In a, the VD pressure maintaining period:
Nitrogen flushing flow is controlled at steel 2.0-3.0Nl/min per ton, and pressure-controlling is at 0.2MPa;
The nitrogen flushing time is set according to nitrogen in steel content, and steel per ton calculates the nitrogen flushing time according to 3.0-4.0 ppm/ min;
B, the broken empty back of VD:
Nitrogen flushing flow is controlled at steel 1.2-1.8Nl/min per ton, and pressure-controlling is at 0.15MPa;
The nitrogen flushing time is set according to nitrogen in steel content, and steel per ton calculates the nitrogen flushing time according to 6.0-7.0 ppm/ min;
When the nitrogen in steel weight percent content reached 0.005-0.020%, the control inclusion fully floated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110403461XA CN102787216A (en) | 2011-12-07 | 2011-12-07 | Method for producing non-quenched and tempered N80 1 steel by nitrogen content control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110403461XA CN102787216A (en) | 2011-12-07 | 2011-12-07 | Method for producing non-quenched and tempered N80 1 steel by nitrogen content control |
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| CN102787216A true CN102787216A (en) | 2012-11-21 |
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| CN201110403461XA Pending CN102787216A (en) | 2011-12-07 | 2011-12-07 | Method for producing non-quenched and tempered N80 1 steel by nitrogen content control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048139A (en) * | 2016-07-11 | 2016-10-26 | 宝钢特钢有限公司 | Nitrogen blowing alloying method for 18CrNiMo7-6 steel |
| CN116005070A (en) * | 2022-12-23 | 2023-04-25 | 建龙北满特殊钢有限责任公司 | Production method of non-quenched and tempered steel with nitrogen content adjusted after vacuum |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101550473A (en) * | 2008-03-31 | 2009-10-07 | 鞍钢股份有限公司 | Method for controlling nitrogen content in N80 steel |
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2011
- 2011-12-07 CN CN201110403461XA patent/CN102787216A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101550473A (en) * | 2008-03-31 | 2009-10-07 | 鞍钢股份有限公司 | Method for controlling nitrogen content in N80 steel |
Non-Patent Citations (1)
| Title |
|---|
| 王立来 等: ""N80非调质石油管钢铸坯表面裂纹的解决措施"", 《中国金属学会2003中国钢铁年会论文集（3）》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048139A (en) * | 2016-07-11 | 2016-10-26 | 宝钢特钢有限公司 | Nitrogen blowing alloying method for 18CrNiMo7-6 steel |
| CN106048139B (en) * | 2016-07-11 | 2019-10-22 | 宝钢特钢有限公司 | The nitrogen flushing alloyage process of 18CrNiMo7-6 steel |
| CN116005070A (en) * | 2022-12-23 | 2023-04-25 | 建龙北满特殊钢有限责任公司 | Production method of non-quenched and tempered steel with nitrogen content adjusted after vacuum |
| CN116005070B (en) * | 2022-12-23 | 2024-04-26 | 建龙北满特殊钢有限责任公司 | Production method of non-quenched and tempered steel with nitrogen content adjusted after vacuum |
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Application publication date: 20121121 |