CN109468428A - The method of phosphorus content in a kind of tough Properties of Heavy Rail Steel of converter control height - Google Patents
The method of phosphorus content in a kind of tough Properties of Heavy Rail Steel of converter control height Download PDFInfo
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- CN109468428A CN109468428A CN201811545751.6A CN201811545751A CN109468428A CN 109468428 A CN109468428 A CN 109468428A CN 201811545751 A CN201811545751 A CN 201811545751A CN 109468428 A CN109468428 A CN 109468428A
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- Prior art keywords
- phosphorus content
- heavy rail
- converter
- rail steel
- converter control
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Classifications
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
-
- 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
- C21C7/072—Treatment with gases
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses the method for phosphorus content in a kind of high tough Properties of Heavy Rail Steel of converter control, process routes are as follows: KR molten iron pretreatment desulfurizing-top and bottom combined blown converter-LF refining-VD refines -280 × 380mm bloom and connects.The present invention overcomes the higher problems of phosphorus content in the tough Properties of Heavy Rail Steel production of existing height, provide a kind of method that can effectively control phosphorus content.
Description
Technical field
The present invention relates to phosphorus in converter steelmaking process technical field more particularly to a kind of high tough Properties of Heavy Rail Steel of converter control to contain
The method of amount.
Background technique
It is significant to push the rail updating and upgrading of a product with the continuous promotion that railway traffic requires rail service performance.Its
In have developed a kind of mainly using Mn-Mo-Ni alloy, organize the high strength steel rail product for bainite.The steel grade is to P elements
Have the sensibility of height, Industry code requirements phosphorus content less than 0.015% (mass percent), inner controlling standard of enterprise be less than
0.012% (mass percent).Due to the tough Properties of Heavy Rail Steel of the height (its ingredient is shown in Table 1) alloy content height, alloy phosphorization is big
In 0.004% (mass percent), the difficulty of converter control phosphorus dephosphorization is exacerbated, is unable to reach using traditional converter dephosphorization technique
Target call.
Summary of the invention
In order to overcome the problems, such as that phosphorus content is higher in the tough Properties of Heavy Rail Steel production of existing height, the object of the present invention is to provide one kind
The method of phosphorus content in the high tough Properties of Heavy Rail Steel of converter control.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
The method of phosphorus content in a kind of tough Properties of Heavy Rail Steel of converter control height, comprising:
S1, converter molten iron are all pre-processed through KR molten iron, and entering stokehold ingredient and temperature control situations see the table below:
Using double slag techniques, one, which controls situation, be see the table below for S2, converter smelting:
S3, converter terminal control situation see the table below:
S4, converter tapping seal tapping hole using clay plug before tapping using double pushing off the slag operations；
In converter tapping process, when tap reaches 30%, high quality wheat kiln granule lime 3.5Kg/ is added in S5, thereafter
Ton steel；1.5Kg/ tons of steel fluorites are added；
Strong argon gas stirring in S6, ladle, bottom blowing gas amount is 6~12L/min, and as tapping process is descending；
S7, when tapping reaches 50%, be added metal manganese alloy 2500-3900kg/ furnace；
Slag retaining cone pushing off the slag is used after S8, tapping, the lower quantity of slag is less than 500kg.
Further, the manganese metal Mn mass percent: >=99.7%.
Further, CaO >=85wt%, SiO2≤10wt%, P, S≤0.05wt% in the lime.
Further, the granularity of the lime is 10mm~50mm.It is preferred that 30mm.
Further, when tapping reaches 50%, metal manganese alloy 3200kg/ furnace is added.
Further, bottom blowing gas amount is 9L/min.
Further, fluorite CaF mass fraction >=80%.
Further, the granularity of the fluorite is 5mm~30mm.
Further, the granularity of the fluorite is 17mm.
Compared with prior art, advantageous effects of the invention:
1), this method is implemented reliable, can stablize the high tough Properties of Heavy Rail Steel phosphorus of guarantee within 0.012%；
2), this method quantifies crucial technical requirements, therefore easy promotion and implementation, and can guarantee implementation result；
3), this method can promote and apply in all converters.
Specific embodiment
Embodiment 1:
The embodiment is with method of the invention in 150 tons of 8 furnace bainite rail U20MN2SICRNIMO of converter producing,
Chemical component is shown in Table 1.
1 U20MN2SICRNIMO chemical component of table/%
| Ingredient | C | Si | Mn | P | S | Cr | Ni | Mo |
| It is required that | 0.17-0.22 | 0.80-1.00 | 2.20-2.45 | ≤0.022 | ≤0.015 | 0.85-1.05 | 0.55-0.70 | 0.30-0.45 |
Production process route are as follows: KR molten iron pretreatment desulfurizing --- top and bottom combined blown converter --- LF refining --- VD essence
Refining --- 280 × 380mm bloom continuous casting.
Wherein:
Converter molten iron is all pre-processed through KR molten iron, and entering stokehold ingredient and temperature control situations see the table below:
1) using double slag techniques, one controls situation see the table below converter smelting:
2) converter terminal control situation see the table below:
Thereafter, converter tapping seals tapping hole using clay plug before tapping using double pushing off the slag operations；
Thereafter, in converter tapping process, when tap reaches 30%, 3.5Kg/ tons of high quality wheat kiln granule lime is added
Steel, CaO >=85wt%, SiO2≤10wt%. in lime, between P, S≤0.05wt%, granularity 10mm~50mm；It is added
1.5Kg/ tons of steel fluorites, fluorite CaF >=80%, between granularity 5mm~30mm；
Thereafter, strong argon gas stirring in ladle, bottom blowing gas amount is 6~12L/min, and as tapping process is descending；
Thereafter, when tapping reaches 50%, metal manganese alloy 3200kg/ furnace is added；The manganese metal Mn mass percent:
>=99.7%；
Thereafter, slag retaining cone pushing off the slag is used after tapping, the lower quantity of slag is less than 500kg.
The finished product composition of steel finally obtained is as follows:
By the implementation of this method, 8 furnace steel finished product produced is detected P content therein all less than 0.010%, completely
Sufficient steel grade design requirement.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (10)
1. the method for phosphorus content in a kind of high tough Properties of Heavy Rail Steel of converter control characterized by comprising
S1, converter molten iron are all pre-processed through KR molten iron, and entering stokehold ingredient and temperature control situations see the table below:
Using double slag techniques, one, which controls situation, be see the table below for S2, converter smelting:
S3, converter terminal control situation see the table below:
S4, converter tapping seal tapping hole using clay plug before tapping using double pushing off the slag operations；
In converter tapping process, when tap reaches 30%, 3.5Kg/ tons of steel of high quality wheat kiln granule lime are added in S5, thereafter
With 1.5Kg/ tons of steel fluorites；
Strong argon gas stirring in S6, ladle, bottom blowing gas amount is 6~12L/min, and as tapping process is descending；
S7, when tapping reaches 50%, be added metal manganese alloy 2500-3900kg/ furnace；
Slag retaining cone pushing off the slag is used after S8, tapping, the lower quantity of slag is less than 500kg.
2. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that the gold
Category manganese Mn mass percent: >=99.7%.
3. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that the stone
CaO >=85wt% in ash, SiO2≤10wt%, P, S≤0.05wt%.
4. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that the stone
The granularity of ash is 10mm~50mm.
5. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 4, which is characterized in that the stone
The granularity of ash is 30mm.
6. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that tapping
When reaching 50%, metal manganese alloy 3200kg/ furnace is added.
7. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that bottom blowing supplies
Tolerance is 9L/min.
8. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that the firefly
Stone CaF mass fraction >=80%.
9. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 1, which is characterized in that the firefly
The granularity of stone is 5mm~30mm.
10. the method for phosphorus content in the high tough Properties of Heavy Rail Steel of converter control according to claim 9, which is characterized in that described
The granularity of fluorite is 17mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811545751.6A CN109468428B (en) | 2018-12-17 | 2018-12-17 | Method for controlling phosphorus content in high-strength and high-toughness heavy rail steel by converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811545751.6A CN109468428B (en) | 2018-12-17 | 2018-12-17 | Method for controlling phosphorus content in high-strength and high-toughness heavy rail steel by converter |
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| Publication Number | Publication Date |
|---|---|
| CN109468428A true CN109468428A (en) | 2019-03-15 |
| CN109468428B CN109468428B (en) | 2020-10-27 |
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| CN201811545751.6A Active CN109468428B (en) | 2018-12-17 | 2018-12-17 | Method for controlling phosphorus content in high-strength and high-toughness heavy rail steel by converter |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62211324A (en) * | 1986-03-12 | 1987-09-17 | Dai Ichi High Frequency Co Ltd | Heat treatment of top of alloy steel rail end |
| JPH09296254A (en) * | 1996-05-08 | 1997-11-18 | Nkk Corp | High strength bainitic steel rail excellent in flaking damage resistance and its production |
| CN101624683A (en) * | 2009-08-11 | 2010-01-13 | 武汉科技大学 | Ultra-high strength bainite rail steel and manufacturing method thereof |
| CN103194564A (en) * | 2013-03-25 | 2013-07-10 | 济钢集团有限公司 | Process for producing ultra-low phosphorus steel |
| CN103409693A (en) * | 2013-07-31 | 2013-11-27 | 内蒙古包钢钢联股份有限公司 | Steel used for bainite rail, and manufacturing method thereof |
| CN107385142A (en) * | 2017-06-29 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | A kind of smelting process of high strength low carbon bainibic steel |
| CN107723412A (en) * | 2017-09-29 | 2018-02-23 | 唐山钢铁国际工程技术股份有限公司 | A kind of duplex of high phosphorus hot metal smelts dephosphorization technology |
| CN108251592A (en) * | 2018-01-19 | 2018-07-06 | 山东钢铁集团日照有限公司 | A kind of converter smelting method of extremely low phosphoretic steel |
-
2018
- 2018-12-17 CN CN201811545751.6A patent/CN109468428B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62211324A (en) * | 1986-03-12 | 1987-09-17 | Dai Ichi High Frequency Co Ltd | Heat treatment of top of alloy steel rail end |
| JPH09296254A (en) * | 1996-05-08 | 1997-11-18 | Nkk Corp | High strength bainitic steel rail excellent in flaking damage resistance and its production |
| CN101624683A (en) * | 2009-08-11 | 2010-01-13 | 武汉科技大学 | Ultra-high strength bainite rail steel and manufacturing method thereof |
| CN103194564A (en) * | 2013-03-25 | 2013-07-10 | 济钢集团有限公司 | Process for producing ultra-low phosphorus steel |
| CN103409693A (en) * | 2013-07-31 | 2013-11-27 | 内蒙古包钢钢联股份有限公司 | Steel used for bainite rail, and manufacturing method thereof |
| CN107385142A (en) * | 2017-06-29 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | A kind of smelting process of high strength low carbon bainibic steel |
| CN107723412A (en) * | 2017-09-29 | 2018-02-23 | 唐山钢铁国际工程技术股份有限公司 | A kind of duplex of high phosphorus hot metal smelts dephosphorization technology |
| CN108251592A (en) * | 2018-01-19 | 2018-07-06 | 山东钢铁集团日照有限公司 | A kind of converter smelting method of extremely low phosphoretic steel |
Non-Patent Citations (2)
| Title |
|---|
| 白月琴等: "优化转炉冶炼工艺研究", 《包钢科技》 * |
| 聂福安: "转炉中磷铁水冶炼重轨钢工艺探讨", 《包钢科技》 * |
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| CN109468428B (en) | 2020-10-27 |
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