CN100532618C - Nichrome steel alloy for smelting stainless steel and producing method thereof - Google Patents
Nichrome steel alloy for smelting stainless steel and producing method thereof Download PDFInfo
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- CN100532618C CN100532618C CNB2007100549659A CN200710054965A CN100532618C CN 100532618 C CN100532618 C CN 100532618C CN B2007100549659 A CNB2007100549659 A CN B2007100549659A CN 200710054965 A CN200710054965 A CN 200710054965A CN 100532618 C CN100532618 C CN 100532618C
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Abstract
The invention discloses nickel-chrome alloy steel used for smelting stainless steel, and the production method thereof. The nickel-chrome alloy steel comprises the following components: carbon is 0.3to 2.0, silicon is lower than or equal to 1.0, manganese is lower than or equal to 0.5, phosphorus is lower than or equal to 0.03, sulfur is lower than or equal to 0.04, chromium is 0.6 to 2.5, nickel is 3.5 to 7.0, copper is lower than or equal to 0.2, and the residual is iron. The production process comprises charging material preparation, oxygen supply, slag forming, end point control, deoxidization alloying and nitrogen flush processing, etc., charging material comprises nickel including molten iron and nickel including iron blocks, being expressed according the weight percentage, nickel including molten iron occupies 75 to 90 percent, the nickel including iron blocks occupy 10 to 25 percent; an oxygen top-blow converter is adopted to smelt, the double slag method is used to form the slag, the end point alkalinity is larger than 2.5, the carbon content C is larger than or equal to 0.30. The nickel-chrome alloy steel of the invention includes lower phosphorus and sulfur which can be directly used as raw materials for smelting the stainless steel, the output and the quality of the stainless steel can be improved, and the production cost is reduced.
Description
One, technical field:
The present invention relates to a kind of steel alloy, particularly relate to a kind of nickel-chrome alloy steel and production method thereof that is used for smelting stainless steel.
Two, background technology:
Along with the increase of stainless steel market demand, stainless steel manufacturer reduces cost in order to improve output, a kind of smelting stainless steel raw material of demand, and this raw material can be used for direct smelting stainless steel.This raw material is a nickel-chrome alloy steel.The characteristics of nickel-chrome alloy steel are to smelt in the molten iron of nickel-chrome alloy steel to contain higher metallic nickel and chromium, contain lower p and s, and therefore, nickel-chrome alloy steel is the extraordinary raw material of smelting stainless steel, and is inexpensive, and the energy consumption during production is low.
The hot stove in ore deposit is mainly adopted in the smelting of nichrome in the past.Domestic since 2006 have minority producer to begin to adopt electrosmelting, adopts these two kinds of technologies all need consume a large amount of electric energy, and steel power consumption per ton is more than 500 degree.Adopting the shortcoming of the hot stove in ore deposit, electrosmelting is that production efficiency is low, energy consumption height, phosphorus content height in the steel, refractory consumption rate height.Therefore, exploitation converter smelting nickel-chrome alloy steel is very important.
The patent No. is: 03146206.5 patent of invention discloses a kind of method of converter steelmaking, and the used raw material type of this method is molten iron and solid iron charge, and the steel that this method is produced is an ordinary steel; Method of the present invention is a converter smelting, but raw materials used composition and technological process and this patent all have difference, and the steel that the inventive method is produced is a steel alloy.
Three, summary of the invention:
The technical problem to be solved in the present invention: a kind of nickel-chrome alloy steel and production method thereof that is directly used in smelting stainless steel is provided, and the nickel-chrome alloy steel of producing has low, the production process advantage of low energy consumption of foreign matter content such as p and s.
Technical scheme of the present invention:
A kind of nickel-chrome alloy steel is represented with weight percent, contains carbon 0.3～2.0, silicon≤1.0, manganese≤0.5, phosphorus≤0.03, sulphur≤0.04, chromium 0.6～2.5, nickel 3.5～7.0, copper≤0.2 in the composition, and surplus is an iron.
A kind of production method of nickel-chrome alloy steel comprises furnace charge preparation, oxygen supply, slag making, terminal point control, deoxidation alloying and nitrogen flushing treatment process,
(1) furnace charge preparation: furnace charge is nickel-containing molten iron and nickeliferous iron block, represents with weight percent, and nickel-containing molten iron is 75～90, and nickeliferous iron block is 10～25;
The percentage composition of nickel-containing molten iron is: carbon 3.5～5.5, silicon 1.0～3.5, manganese 0.3～0.8, phosphorus 0.08～0.15, sulphur 0.03～0.07, chromium 3.0～6.0, nickel 3.0～6.0, copper≤0.2, surplus are iron;
(2) oxygen supply: adopt top-blown oxygen converter to smelt, oxygen supply pressure 0.7～0.9Mpa, oxygen flow are 8100～9200Nm
3/ h;
(3) slag making: adopt double slag process to smelt, end-point alkalinity is greater than 2.5;
Add sinter return fine 5～30kg/ ton steel in the first batch, and then add sinter return fine 14～30kg/ ton steel in batches according to furnace temperature; Add light dolomite 15～30kg/ ton steel;
The total add-on of lime is calculated according to the molten iron si content, adds 1/2～2/3 of lime total amount in the first batch, and Control for Kiln Temperature blew 8～12 minutes at 1500～1600 ℃, stove, slagging;
First batch of slag adds 1/2～1/3 of lime total amount after putting and removing again; Add fluorite and/or iron scale, the total add-on of fluorite and/or iron scale is 3～10kg/ ton steel; Blew again 5～6 minutes, for the second time stove, deslagging;
(4) terminal point controlled target carbon content: C 〉=0.30, tapping temperature are controlled at 1700～1720 ℃;
(5) deoxidation alloying adds reductor, and its add-on is 0.3～1.0kg/ ton steel.
The composition of described nickeliferous iron block and the composition of nickel-containing molten iron are basic identical.
Described continuous casting of molten steel is cast into steel billet, during casting in the bag temperature according to carbon content control in the molten steel, the continuous casting section is little square billet, pulling rate is 1.2～1.8m/min.
Described reductor is barium alloy, ferro-silicon, manganeseirom or other reductors.
Nitrogen flow 500～1000Nm when described nitrogen flushing is handled
3/ h, the bottom blowing time is 3～8 minutes.
The positive beneficial effect that the present invention has:
(1) nickel-chrome alloy steel of the present invention contains lower p and s, can improve stainless output and quality directly as the raw material of smelting stainless steel, has reduced production cost simultaneously.
(2) nickel-chrome alloy steel of the present invention adopts converter smelting to replace hot stove in ore deposit or electrosmelting, compares with adopting the hot stove in ore deposit, electrosmelting, and method of the present invention has the production efficiency height, energy consumption is low, the low advantage of foreign matter content such as sulphur, phosphorus in the steel.Therefore, the present invention has good economic and social benefit.
(3) owing to adopt blast-melted smelting, so harmful element is few in the steel, steel is pure, and quality is good.
Four, description of drawings:
Fig. 1: carbon content and process temperature in the steelmaking process concern control chart
Curve from top to bottom is respectively among the figure:
Curve 1: ■ represents temperature behind the cool bag first stove nitrogen; Curve 2: ▲ expression connects waters temperature behind the heat nitrogen;
Curve 3: ● expression connects to water wraps temperature in the heat; Curve 4: ◇ represents the teeming temperature lower limit.
Five, embodiment:
The production method of embodiment one, nickel-chrome alloy steel
(1) furnace charge preparation:
Furnace charge is nickel-containing molten iron and nickeliferous iron block, represents with weight percent, and nickel-containing molten iron is 84.4%, and nickeliferous iron block is 15.6%, and the Intake Quantity nickel-containing molten iron is 34.1 tons, and nickeliferous iron block is that pig is 6.3 tons.
Hot metal composition is as follows:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 5.25 | 2.3 | 0.56 | 0.086 | 0.036 | 3.5 | 3.77 | 0.07 |
Nickeliferous iron block composition is identical with nickel-containing molten iron.
(2) oxygen supply: adopt top-blown oxygen converter to smelt, it is 0.8～0.9MPa that the oxygen of employing is pressed, the voltage-controlled 0.85MPa that is made as of oxygen during oxygen supply, and oxygen flow is 8700Nm
3/ h.
The rifle position: minimum 0.9 meter, blowing rifle position 1.2-2.0 rice; Smelting cycle 45-50 minute;
(3) slag making: adopt double slag process to smelt, put acid slag early stage more, improves basicity as far as possible, can the 2-3 of falling the stove time, and end-point alkalinity is greater than 2.5, if the slag viscosity is big, adds the adjusting of fluorite or iron sheet.
First batch of lime 4300kg (closing 121kg/ ton steel), light dolomite 500kg (closing 14kg/ ton steel), sinter return fine 200kg (closing 5.6_kg/ ton steel), the iron scale 200kg (closing 5.6kg/ ton steel) of adding.
Two crowdes of lime 2150kg (closing 60.6kg/ ton steel), three batches of lime add 1900kg (closing 53.5kg/ ton steel).
Fall for the first time stove 8 minutes and 52 seconds, 1614 ℃ of temperature; Fall for the second time stove 15 minutes and 20 seconds, 1709 ℃ of temperature; Fall stove 20 minutes and 30 seconds for the third time, 1699 ℃ of temperature, full stove oxygen-supplying amount 3028m
3
(4) terminal point controlled target carbon content: C 〉=0.30%, tapping temperature 1690-1720 ℃, add the 200kg pitch coke as carburelant (closing 5.7kg/ ton steel), require that carbon content is greater than 92% in the pitch coke, sulphur content is less than 0.2%.
Can adopt homlolgation carburetting according to user's needs, carbon content is increased to more than 1.0%.
(5) deoxidation alloying adds 30kgBaCaSi alloy reductor (closing 0.845kg/ ton steel).
(6) nitrogen flushing is handled and will be smelted good molten steel and carry out nitrogen flushing processing, nitrogen flow 800Nm
3/ h, bottom blowing 6 minutes.
Liquid steel temperature is 1580 ℃ after the bottom blowing, and composition sees the following form, and carbon content 0.95% in the steel.By curve among Fig. 12 as can be known, when carbon content in the steel was 0.95%, temperature should be controlled at 1585 ℃ behind the nitrogen, and as seen this temperature meets the requirements.
35.5 tons of the finished product steel alloys that obtains, composition such as following table:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 0.95 | 0.03 | 0.05 | 0.023 | 0.028 | 1.85 | 4.03 | 0.001 |
(7) continuous casting
By curve among Fig. 13, curve 4 as seen, when carbon content was 0.95%, the pouring temperature interval was about 1470-1505 ℃.
The bag temperature is 1490-1510 ℃ in after continuous casting is opened and watered, and as seen this temperature is proper.
The metering nozzle diameter is: ∮ 13.5mm, and actual pulling rate: 1.2-1.5m/min, sufficient roller and one section water yield partition ratio are 1:1.
Embodiment two, basic identical with embodiment one, difference is:
(1) furnace charge: nickel-containing molten iron is 80%, and nickeliferous iron block is 20%, and the Intake Quantity nickel-containing molten iron is 32 tons, and nickeliferous iron block is that pig is 8 tons.
The composition of molten iron is as follows:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 4.13 | 2.79 | 0.60 | 0.092 | 0.074 | 3..02 | 3.64 | 0.07 |
(2) smelt
Open and blow back oxygen and press and to be 0.80MPa, oxygen flow is 8600Nm
3/ h, rifle position 1.2-2.4m falls for the first time stove 7 minutes and 27 seconds, 1419 ℃ of temperature; Fall for the second time stove 14 minutes and 10 seconds, 1670 ℃ of temperature; Fall stove 18 minutes and 20 seconds for the third time, 1710 ℃ of temperature, full stove oxygen-supplying amount 2800m
3
First batch of lime 3900kg (closing 110kg/ ton steel), light dolomite 500kg (closing 14.2kg/ ton steel), the 200kg that returns mine (closing 5.7kg/ ton steel), iron scale 200kg (closing 5.7kg/ ton steel), the fluorite 110kg (closing 3.1kg/ ton steel) of adding.
Two crowdes of lime 2100kg (closing 59.5kg/ ton steel), three batches of lime add 1400kg (closing 39.70kg/ ton steel),
Add 30kg ferro-silicon reductor (closing 0.85kg/ ton steel), 360kg hard coal carburelant (closing 10.2kg/ ton steel) before the tapping.
35.3 tons of the finished product steel alloys that obtains, composition such as following table:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 1.6 | 0.02 | 0.04 | 0.026 | 0.036 | 1.73 | 3.94 | 0.002 |
(3) continuous casting
Continuous casting is opened and is watered that the bag observed temperature is 1430 ℃-1450 ℃ in the back, by curve among Fig. 13 and curve 4 as can be known, but carbon content of molten steel be the pouring temperature of 1.6% o'clock tundish molten steel should be for 1405 ℃-1450 ℃, so liquid steel temperature is more suitable.Actual pulling rate is: 1.1-1.5m/min, mouth of a river diameter: 13.5mm.
Embodiment three, basic identical with embodiment one, difference is:
(1) furnace charge: nickel-containing molten iron is 78%, and nickeliferous iron block is 22%, and the composition of molten iron is as follows:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 3.8 | 2.0 | 0.45 | 0.12 | 0.05 | 4.0 | 4.2 | 0.15 |
The composition of nickeliferous iron block is:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 4.3 | 2.6 | 0.34 | 0.15 | 0.06 | 3.7 | 4.6 | 0.10 |
(2) smelt
Open and blow back oxygen and press and to be 0.87MPa, oxygen flow is 8900Nm
3/ h, rifle position 1.4m falls for the first time stove 9 minutes and 30 seconds, 1510 ℃ of temperature; Fall for the second time stove 15 minutes and 10 seconds, 1700 ℃ of temperature; Fall stove 19 minutes and 10 seconds for the third time, 1700 ℃ of temperature, full stove oxygen-supplying amount 2900m
3
First batch of lime 120kg/ ton steel, light dolomite 20kg/ ton steel, sinter return fine 15kg/ ton steel, iron scale 8.0kg/ ton steel, the fluorite 7.0kg/ ton steel of adding.
Two batches of lime add 60kg/ ton steel, and three batches of lime add 45kg/ ton steel; Add Ferro Manganese reductor 0.50kg/ ton steel before the tapping.
Finished product steel alloy composition such as following table:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 0.8 | 0.10 | 0.20 | 0.021 | 0.022 | 2.22 | 5.2 | 0.07 |
Embodiment four, basic identical with embodiment one, difference is:
(1) furnace charge: nickel-containing molten iron is 88%, and nickeliferous iron block is 12%, and the nickel-containing molten iron composition is as follows:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 4.0 | 3.2 | 0.71 | 0.14 | 0.06 | 5.0 | 5.0 | 0.17 |
Nickeliferous iron block composition is as follows:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 4.5 | 2.9 | 0.64 | 0.13 | 0.061 | 3.9 | 4.1 | 0.16 |
(2) smelt
Open and blow back oxygen and press and to be 0.9MPa, oxygen flow is 9100Nm
3/ h, rifle position 1.6m falls for the first time stove 9 minutes and 10 seconds, 1600 ℃ of temperature; Fall for the second time stove 14 minutes and 30 seconds, 1670 ℃ of temperature; Fall stove 19 minutes and 20 seconds for the third time, 1690 ℃ of temperature, full stove oxygen-supplying amount 3000m
3
First batch of lime 110kg/ ton steel, light dolomite 23kg/ ton steel, sinter return fine 20kg/ ton steel, iron scale 5.0kg/ ton steel, the fluorite 5.0kg/ ton steel of adding.
Two batches of lime add 60kg/ ton steel, and three batches of lime add 50kg/ ton steel;
Add ferro-silicon reductor 0.80kg/ ton steel before the tapping, add pitch coke carburelant 8.2kg/ ton steel.
Finished product steel alloy composition such as following table:
| Composition | C | Si | Mn | P | S | Cr | Ni | Cu |
| Content % | 1.2 | 0.1 | 0.10 | 0.017 | 0.025 | 1.5 | 4.7 | 0.06 |
Claims (5)
1. the production method of a nickel-chrome alloy steel comprises furnace charge preparation, oxygen supply, slag making, terminal point control, deoxidation alloying and nitrogen flushing processing, it is characterized in that:
(1) furnace charge preparation: furnace charge is nickel-containing molten iron and nickeliferous iron block, represents with weight percent, and nickel-containing molten iron is 75～90, and nickeliferous iron block is 10～25;
The percentage composition of nickel-containing molten iron is: carbon 3.5～5.5, silicon 1.0～3.5, manganese 0.3～0.8, phosphorus 0.08～0.15, sulphur 0.03～0.07, chromium 3.0～6.0, nickel 3.0～6.0, copper≤0.2, surplus are iron;
(2) oxygen supply: adopt top-blown oxygen converter to smelt, oxygen supply pressure 0.7～0.9Mpa, oxygen flow are 8100～9200Nm
3/ h;
(3) slag making: adopt double slag process to smelt, end-point alkalinity is greater than 2.5;
Add sinter return fine 5～30kg/ ton steel in the first batch, and then add sinter return fine 14～30kg/ ton steel in batches according to furnace temperature; Add light dolomite 15～30kg/ ton steel;
The total add-on of lime is calculated according to the molten iron si content, adds 1/2～2/3 of lime total amount in the first batch, and Control for Kiln Temperature blew 8～12 minutes at 1500～1600 ℃, stove, slagging;
First batch of slag adds 1/2～1/3 of lime total amount after putting and removing again; Add fluorite and/or iron scale, the total add-on of fluorite and/or iron scale is 3～10kg/ ton steel; Blew again 5～6 minutes, for the second time stove, deslagging;
(4) terminal point controlled target carbon content: C 〉=0.30, tapping temperature are controlled at 1700～1720 ℃;
(5) deoxidation alloying adds reductor, and its add-on is 0.3～1.0kg/ ton steel;
Described nickel-chrome alloy steel is represented with weight percent, contains carbon 0.3～2.0, silicon≤1.0, manganese≤0.5, phosphorus≤0.03, sulphur≤0.04, chromium 0.6～2.5, nickel 3.5～7.0, copper≤0.2 in the composition, and surplus is an iron.
2. the production method of nickel-chrome alloy steel according to claim 1, it is characterized in that: the composition of described nickeliferous iron block is identical with the composition of nickel-containing molten iron.
3. the production method of nickel-chrome alloy steel according to claim 1 is characterized in that: described continuous casting of molten steel is cast into steel billet, during casting in the bag temperature according to carbon content control in the molten steel, the continuous casting section is little square billet, pulling rate is 1.2～1.8m/min.
4. the production method of nickel-chrome alloy steel according to claim 1, it is characterized in that: described reductor is barium alloy, ferro-silicon or manganeseirom.
5. the production method of nickel-chrome alloy steel according to claim 1 is characterized in that: nitrogen flow 500～1000Nm when described nitrogen flushing is handled
3/ h, the bottom blowing time is 3～8 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100549659A CN100532618C (en) | 2007-08-15 | 2007-08-15 | Nichrome steel alloy for smelting stainless steel and producing method thereof |
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|---|---|---|---|
| CNB2007100549659A CN100532618C (en) | 2007-08-15 | 2007-08-15 | Nichrome steel alloy for smelting stainless steel and producing method thereof |
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| CN100532618C true CN100532618C (en) | 2009-08-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787497A (en) * | 2010-03-30 | 2010-07-28 | 上海中河金属加工有限公司 | Prepared furnace charge and processing technology thereof |
| CN101857911B (en) * | 2010-07-16 | 2012-01-11 | 四川省达州钢铁集团有限责任公司 | Method for steelmaking by using converter |
| CN101928804A (en) * | 2010-08-31 | 2010-12-29 | 振石集团东方特钢股份有限公司 | Production method of austenitic stainless steel |
| CN103614506B (en) * | 2013-12-01 | 2015-12-02 | 武钢集团昆明钢铁股份有限公司 | A kind of converter steel making method using little grade high basicity sinter |
| CN103911479B (en) * | 2014-04-22 | 2016-01-20 | 武汉钢铁(集团)公司 | The method of chrome ore direct Reducing and Alloying in 90t top and bottom combined blown converter |
| CN107630119B (en) * | 2016-07-18 | 2019-04-26 | 鞍钢股份有限公司 | A kind of alloyage process of converter carbon deoxidization technique |
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Effective date of registration: 20190524 Address after: 451200 Yongning Road, Zhitian Town, Gongyi City, Zhengzhou City, Henan Province Patentee after: Henan Changtai Stainless Steel Plate Co., Ltd. Address before: 451252 Henan Chaoyang Iron and Steel Co., Ltd. Gongyi Industrial Demonstration Zone, Henan Province Patentee before: Henan Chaoyang Iron Co., Ltd. |
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