CN105755357A - Smelting method of low-carbon high-chromium steel and low-carbon high-chromium steel prepared through method - Google Patents
Smelting method of low-carbon high-chromium steel and low-carbon high-chromium steel prepared through method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of alloy steel and particularly provides a smelting method of low-carbon high-chromium steel and low-carbon high-chromium steel prepared through the method.The method includes the following steps that 1, pig iron is added into a revolving furnace for primary smelting; 2, the revolving furnace outputs steel; 3, refining is conducted in an LF furnace for the first time; 4, refining is conducted in an RH vacuum furnace for the second time; 5, molten steel can be subjected to continuous casting, rolling and finishing after circulating degasification and deoxygenation processing.The low-carbon high-chromium steel comprises, by weight, less than or equal to 0.025% of C, 0.10-0.16% of Si, 0.32-0.48% of Mn, 0.020-0.035% of Nb, 0.20-0.35% of Ni, 0.02-0.04% of Al, 0.25-0.4% of Cu, 3.6-4.0% of Cr and the balance Fe and inevitable impurities.Process steps and parameters are reasonably designed, so that when the low-carbon high-chromium steel is smelted, the content of carbon in chrome steel can be lowered, the carbon content can also be controlled within the operable range, and process difficulty of the low-carbon high-chromium steel is greatly lowered.
Description
Technical field
The present invention relates to technical field of alloy steel, be specifically related to the smelting side of a kind of low-carbon high-chromium steel
Method and the low-carbon high-chromium steel of preparation thereof.
Background technology
Low-carbon high-chromium steel is widely used in due to its excellent plasticity making load resistance, shape
In the mold materials complicated, requirement deformation is little, wearability is high, red hardness is good, such as plastics mill
Tool, milling apparatus, pressure ball equipment etc..At present, what the production of low-carbon high-chromium steel mainly faced asks
Topic is: in molten steel, carbon content is difficult to control, and production cost is high, and technology difficulty is big.
It is difficult to control for solving existing low-carbon high-chromium steel material carbon content, the problem that production cost is high,
Chinese invention patent Authorization Notice No. CN 102703644 B discloses a kind of low-carbon (LC) height chromium that produces and closes
The method of Jin Gang, it is possible to realize the production of low-carbon high-chromium steel and production cost can be reduced.
But, the technology difficulty of this invention is the highest, when carrying out refine with RH vacuum drying oven, and palpus
Control carbon weight percent content≤0.002% in steel, and this technical step is almost difficult to
Realize.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of technology difficulty low, and be prone to
Realize, the smelting process of the low-carbon high-chromium steel being easily controlled and the low-carbon high-chromium steel of preparation thereof.
For realizing object above, the present invention is achieved by the following technical programs:
The smelting process of a kind of low-carbon high-chromium steel, said method comprising the steps of:
S1., converter adds the pig iron and carries out first water of making steel, during tapping, adjust C weight percent content
For 0.04-0.06wt%, tapping temperature is 1645-1655 DEG C；
S2. converter tapping, does not carry out deoxidation, and adds the chromium of 25-35kg/t molten steel in tapping process
Ferroalloy, the Cr content adjusted in molten steel is 2.3-2.8wt%；
S3. in LF stove, carry out refine for the first time, when temperature reaches 1595-1605 DEG C, add
Ferrochrome, the Cr content adjusted in molten steel is 3.0-3.4wt%, when temperature reaches
When 1595-1605 DEG C, adding ferrochrome, the Cr content adjusted in molten steel is 3.6-4.2wt%,
C content is 0.035-0.045wt%；
S4. in RH vacuum drying oven, carry out second time refine, pressure in vacuum tank P < 400Pa be set,
Carrying out top and bottom complex blowing oxygen, oxygen blast flow is 1200-1500Nm simultaneously3/ h, carries out second time refine
Time be 45-60min；
S5. molten steel is after circulating degasification, deoxidation treatment, can routinely technique carry out continuous casting,
Rolling, finishing.
Further, the pig iron amount added in described step S1 is molten steel gross weight
0.1-0.3%.
Further, after the second time refine of described step S4 terminates, carry out bag Bottom Argon Stirring,
Argon blowing time is 20-30min.
Further, the ferrochrome added in described S2 is high-carbon chrome alloy, described S3
Middle added ferrochrome is medium carbon ferrochrome alloy or chromic carbide iron alloy.
A kind of adopting produces the low-carbon high-chromium steel obtained with the aforedescribed process.Described low-carbon high-chromium steel
Composition is: C≤0.025wt%, Si:0.10-0.16wt%, Mn:0.32-0.48wt%,
Nb:0.020-0.035wt%, Ni:0.20-0.35wt%, Al:0.02-0.04wt%,
Cu:0.25-0.4wt%, Cr:3.6-4.0wt% and the Fe of surplus and inevitably impurity.
The present invention specifically adds the pig iron when just steel-making water, and extends iron and steel oxygen when refine
Change the time of reduction, improve the practical decarburized depth of smelting iron and steel；Additionally when converter tapping not
Deoxidation, and deoxidation after refine, effectively reduce production cost.The present invention is by technique
Step and the appropriate design of parameter so that when smelting low carbon high chrome, can effectively reduce chromium
Carbon content in steel, can greatly reduce again by carbon content control in exercisable scope
The technology difficulty that low-carbon high-chromium steel is smelted.Present invention process difficulty is low, and is easily achieved, and can grasp
Control property is strong.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot
Close embodiments of the invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Embodiment 1:
The smelting process of a kind of low-carbon high-chromium steel, comprises the following steps:
S1. the pig iron adding molten steel gross weight 0.1% in converter carries out just refining, and adjusts C weight during tapping
Amount degree is 0.04wt%, and tapping temperature is 1645 DEG C；
S2. converter tapping, does not carry out deoxidation, and adds the high-carbon of 25kg/t molten steel in tapping process
Ferrochrome, the Cr content adjusted in molten steel is 2.3wt%；
S3. in LF stove, carry out refine for the first time, when temperature reaches 1595 DEG C, carbon in addition
Ferrochrome, the Cr content adjusted in molten steel is 3.0wt%, and the molten steel adding alloy can be the coldest
But, temperature declines, when temperature reaches 1595 DEG C again, and carbon or micro-carbon chromium in the most again adding
Ferroalloy, the Cr content adjusted in molten steel is 3.6wt%, and C content is 0.035wt%；
S4. carrying out second time refine in RH vacuum drying oven, arranging pressure in vacuum tank P is 400Pa,
Carrying out top and bottom complex blowing oxygen, oxygen blast flow is 1200Nm3/h simultaneously, carry out second time refine time
Between be 45min, after refine terminates, carry out bag Bottom Argon Stirring, argon blowing time is 20min；
S5. molten steel is after circulating degasification, deoxidation treatment, can routinely technique carry out continuous casting,
Rolling, finishing.
The composition of low-carbon high-chromium steel is: C:0.025wt%, Si:0.10wt%, Mn:0.32wt%,
Nb:0.035wt%, Ni:0.35wt%, Al:0.04wt%, Cu:0.25wt%, Cr:3.6wt%
And the Fe of surplus and inevitable impurity.
Embodiment 2:
The smelting process of a kind of low-carbon high-chromium steel, comprises the following steps:
S1. the pig iron adding molten steel gross weight 0.2% in converter carries out just refining, and adjusts C weight during tapping
Amount degree is 0.045wt%, and tapping temperature is 1648 DEG C；
S2. converter tapping, does not carry out deoxidation, and adds the high-carbon of 28kg/t molten steel in tapping process
Ferrochrome, the Cr content adjusted in molten steel is 2.5wt%；
S3. in LF stove, carry out refine for the first time, when temperature reaches 1598 DEG C, carbon in addition
Ferrochrome, the Cr content adjusted in molten steel is 3.1wt%, and the molten steel adding alloy can be the coldest
But, temperature declines, and when temperature reaches 1598 DEG C again, the most again adds medium carbon ferrochrome alloy,
The Cr content adjusted in molten steel is 3.8wt%, and C content is 0.038wt%；
S4. carrying out second time refine in RH vacuum drying oven, arranging pressure in vacuum tank P is 300Pa,
Carrying out top and bottom complex blowing oxygen, oxygen blast flow is 1250Nm3/h simultaneously, carry out second time refine time
Between be 50min, after refine terminates, carry out bag Bottom Argon Stirring, argon blowing time is 22min；
S5. molten steel is after circulating degasification, deoxidation treatment, can routinely technique carry out continuous casting,
Rolling, finishing.
The composition of low-carbon high-chromium steel is: C:0.022wt%, Si:0.16wt%, Mn:0.48wt%,
Nb:0.020wt%, Ni:0.20wt%, Al:0.02wt%, Cu:0.4wt%, Cr:4.0wt% with
And the Fe of surplus and inevitable impurity.
Embodiment 3:
The smelting process of a kind of low-carbon high-chromium steel, comprises the following steps:
S1. the pig iron adding molten steel gross weight 0.2% in converter carries out just refining, and adjusts C weight during tapping
Amount degree is 0.05wt%, and tapping temperature is 1650 DEG C；
S2. converter tapping, does not carry out deoxidation, and adds the high-carbon of 30kg/t molten steel in tapping process
Ferrochrome, the Cr content adjusted in molten steel is 2.6wt%；
S3. in LF stove, carry out refine for the first time, when temperature reaches 1600 DEG C, add carbon in a subtle way
Ferrochrome, the Cr content adjusted in molten steel is 3.2wt%, and the molten steel adding alloy can be the coldest
But, temperature declines, and when temperature reaches 1600 DEG C again, adds chromic carbide iron alloy, adjusts
Cr content in molten steel is 4.0wt%, and C content is 0.040wt%；
S4. carrying out second time refine in RH vacuum drying oven, arranging pressure in vacuum tank P is 200Pa,
Carrying out top and bottom complex blowing oxygen, oxygen blast flow is 1400Nm3/h simultaneously, carry out second time refine time
Between be 55min, after refine terminates, carry out bag Bottom Argon Stirring, argon blowing time is 28min；
S5. molten steel is after circulating degasification, deoxidation treatment, can routinely technique carry out continuous casting,
Rolling, finishing.
The composition of low-carbon high-chromium steel is: C:0.023wt%, Si:0.12wt%, Mn:0.32-0.48wt%,
Nb:0.028wt%, Ni:0.26wt%, Al:0.03wt%, Cu:0.26wt%, Cr:3.8wt% with
And the Fe of surplus and inevitable impurity.
Embodiment 4:
The smelting process of a kind of low-carbon high-chromium steel, comprises the following steps:
S1. the pig iron adding molten steel gross weight 0.3% in converter carries out just refining, and adjusts C weight during tapping
Amount degree is 0.06wt%, and tapping temperature is 1655 DEG C；
S2. converter tapping, does not carry out deoxidation, and adds the high-carbon of 35kg/t molten steel in tapping process
Ferrochrome, the Cr content adjusted in molten steel is 2.8wt%；
S3. in LF stove, carry out refine for the first time, when temperature reaches 1605 DEG C, add carbon in a subtle way
Ferrochrome, the Cr content adjusted in molten steel is 3.4wt%, and the molten steel adding alloy can be the coldest
But, temperature declines, and when temperature reaches 1605 DEG C again, adds chromic carbide iron alloy, adjusts
Cr content in molten steel is 4.2wt%, and C content is 0.045wt%；
S4. carrying out second time refine in RH vacuum drying oven, arranging pressure in vacuum tank P is 300Pa,
Carrying out top and bottom complex blowing oxygen, oxygen blast flow is 1500Nm3/h simultaneously, carry out second time refine time
Between be 60min, after refine terminates, carry out bag Bottom Argon Stirring, argon blowing time is 30min；
S5. molten steel is after circulating degasification, deoxidation treatment, can routinely technique carry out continuous casting,
Rolling, finishing.
The composition of low-carbon high-chromium steel is: C:0.024wt%, Si:0.14wt%, Mn:0.46wt%,
Nb:0.024wt%, Ni:0.30wt%, Al:0.03wt%, Cu:0.32wt%, Cr:3.8wt% with
And the Fe of surplus and inevitable impurity.
Above example only in order to technical scheme to be described, is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it,
Or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, not
The essence making appropriate technical solution departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. the smelting process of a low-carbon high-chromium steel, it is characterised in that described method includes following
Step:
S1. adding the pig iron in converter to carry out just refining, adjusting C weight percent content during tapping is
0.04-0.06wt%, tapping temperature is 1645-1655 DEG C；
S2. converter tapping, does not carry out deoxidation, and adds the chromium of 25-35kg/t molten steel in tapping process
Ferroalloy, the Cr content adjusted in molten steel is 2.3-2.8wt%；
S3. in LF stove, carry out refine for the first time, when temperature reaches 1595-1605 DEG C, add
Ferrochrome, the Cr content adjusted in molten steel is 3.0-3.4wt%, when temperature reaches again
When 1595-1605 DEG C, adding ferrochrome, the Cr content adjusted in molten steel is 3.6-4.2wt%,
C content is 0.035-0.045wt%；
S4. in RH vacuum drying oven, carry out second time refine, pressure in vacuum tank P < 400Pa be set,
Carrying out top and bottom complex blowing oxygen, oxygen blast flow is 1200-1500Nm simultaneously3/ h, carries out second time refine
Time be 45-60min；
S5. molten steel is after circulating degasification, deoxidation treatment, can routinely technique carry out continuous casting,
Rolling, finishing.
2. the smelting process of low-carbon high-chromium steel as claimed in claim 1, it is characterised in that step
The 0.1-0.3% that pig iron amount is molten steel gross weight added in S1.
3. the smelting process of low-carbon high-chromium steel as claimed in claim 1, it is characterised in that in step
Rapid S4 second time refine carries out bag Bottom Argon Stirring after terminating, and argon blowing time is 20-30min.
4. the smelting process of low-carbon high-chromium steel as claimed in claim 1, it is characterised in that S2
Middle added ferrochrome is high-carbon chrome alloy, and the ferrochrome added in S3 is middle carbon
Ferrochrome or chromic carbide iron alloy.
5. a low-carbon high-chromium steel, it is characterised in that described low-carbon high-chromium steel uses claim 1
Produce to the method according to any one of 4 and obtain.
6. low-carbon high-chromium steel as claimed in claim 5, it is characterised in that described low-carbon high-chromium steel
Composition be: C≤0.025wt%, Si:0.10-0.16wt%, Mn:0.32-0.48wt%,
Nb:0.020-0.035wt%, Ni:0.20-0.35wt%, Al:0.02-0.04wt%,
Cu:0.25-0.4wt%, Cr:3.6-4.0wt% and the Fe of surplus and inevitably impurity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192840.1A CN105755357A (en) | 2016-03-29 | 2016-03-29 | Smelting method of low-carbon high-chromium steel and low-carbon high-chromium steel prepared through method |
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| CN201610192840.1A CN105755357A (en) | 2016-03-29 | 2016-03-29 | Smelting method of low-carbon high-chromium steel and low-carbon high-chromium steel prepared through method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755709A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys |
| CN114000047A (en) * | 2021-09-28 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon high-chromium steel plate blank and continuous efficient production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703644A (en) * | 2012-06-25 | 2012-10-03 | 武汉钢铁(集团)公司 | Method for producing low-carbon high-chrome alloy steel |
| CN103627973A (en) * | 2013-11-25 | 2014-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for low-carbon high-chromium steel |
| CN103642967A (en) * | 2013-11-18 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing high-chromium steel by converter |
-
2016
- 2016-03-29 CN CN201610192840.1A patent/CN105755357A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703644A (en) * | 2012-06-25 | 2012-10-03 | 武汉钢铁(集团)公司 | Method for producing low-carbon high-chrome alloy steel |
| CN103642967A (en) * | 2013-11-18 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing high-chromium steel by converter |
| CN103627973A (en) * | 2013-11-25 | 2014-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for low-carbon high-chromium steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755709A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys |
| CN106755709B (en) * | 2016-11-25 | 2019-02-01 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr |
| CN114000047A (en) * | 2021-09-28 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon high-chromium steel plate blank and continuous efficient production method thereof |
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Application publication date: 20160713 |