CN109338239A - A kind of production method of low-cost and high-performance structural steel - Google Patents
A kind of production method of low-cost and high-performance structural steel Download PDFInfo
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- CN109338239A CN109338239A CN201811295710.6A CN201811295710A CN109338239A CN 109338239 A CN109338239 A CN 109338239A CN 201811295710 A CN201811295710 A CN 201811295710A CN 109338239 A CN109338239 A CN 109338239A
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- low
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- structural steel
- production method
- performance structural
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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
-
- 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a kind of production methods of low-cost and high-performance structural steel, comprising: (1) designs ingredient；(2) through desulfurizing iron, bessemerize, LF and AR refining, continuous casting, the straight dress of heat, soaking, roughing, finish rolling, section cooling, batch, cool down dispatch from the factory to get.Roll that rear intensity, hardness is uneven and buckling performance problem of poor the invention avoids medium carbon steel, improve its processing performance, surface hardness and logical volume performance uniformity, higher elongation percentage improves its toughness, lower yield tensile ratio improves its processing efficiency, its resistance to shock is improved simultaneously, is had a good application prospect.
Description
Technical field
The invention belongs to high-strength structure rings domain, in particular to a kind of producer of low-cost and high-performance structural steel
Method.
Background technique
The high-strength structure of domestic production with Steel material be mainly used for high building structure material, mechanical highly elastic material,
The fields such as petroleum, vehicle structure, its output gradually increases in recent years.Peaceful nearly 20000 tons of monthly output or so of steel, high-intensitive low conjunction
The golden structural steel material steel trade mark mainly has Ning Gang Q345B, Q345C, Q345D, Q345E, 510L etc., wherein Jiangsu, Shanghai, Zhejiang
The high-strength structure of river area mass production quotient is with Steel material steel using amount up to 1,000,000 tons/year.
High-intensity and high-tenacity structural steel manufacturer reflects that presently used low-alloy carbon steel material is primarily present three aspects and asks
Topic: (1) processability is bad；(2) elongation percentage is relatively low；(3) hardness is inadequate, (4) low strength.
It not yet develops at present and meets the manufacturing procedures such as client's bending, slitting, heat treatment production needs, high-intensity and high-tenacity
The special-purpose steel of structural applications becomes next-generation high-intensity and high-tenacity structure carbon steel for substituting Q345B, Q345C Series Steel.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of production method of low-cost and high-performance structural steel, the party
Method solves that the bad processability that ordinary low-alloy steel easily occurs, low strength and hardness are uneven, have the problems such as soft spots.
A kind of production method of low-cost and high-performance structural steel of the invention, comprising:
(1) ingredient is designed: by mass percentage, C:0.14~0.19%, Si:0.05~0.25%, Mn:0.90~
1.30%, P≤0.025%, S≤0.008%, Als:0.010~0.060%, Nb:0.007~0.018%, surplus be Fe and
Inevitable impurity；
(2) through desulfurizing iron, bessemerize, LF and AR refining, continuous casting, the straight dress of heat, soaking, roughing, finish rolling, laminar flow it is cold
But, batch, cool down factory to get.
Desulfurizing iron in the step (2) is to S≤0.008%.
Converter smelting bottom blowing in the step (2) is switched using nitrogen argon, using slag-stopping tapping.Steel alloying is with addition of containing out
Si, Mn alloy and carburant；It is required that steel ladle bottom argon blowing is good.
LF and AR refining in the step (2) carry out trimming by step (1) component requirements.The technique ginseng of AR refining
Number are as follows: molten steel calmness time >=15 minute；Molten steel non-uniform time >=6 minute carried out merely.
Continuous casting in the step (2) specifically: it is cast using whole process protection, TL=1514 DEG C of liquidus temperature, middle packet
1524 DEG C of molten steel target temperature, crystallizer protecting residue use in carbon covering slag.
The technological parameter that directly fills of heat in the step (2) are as follows: 1200~1220 ± 30 DEG C of tapping temperature, time inside furnace is
150~200min.
The technological parameter of soaking in the step (2) are as follows: time >=16min.
The entrance reference temperature of roughing in the step (2) is 1210 ± 30 DEG C；The entrance reference temperature of finish rolling is
1040±30℃。
Coiling temperature in the step (2) is ± 20 DEG C of (630~640).
Back segment cooling and U-shaped cooling are cooled in the step (2).
The present invention passes through sufficient refining treatment technique, the ingredient and purification molten steel, essence of strict control steel using medium carbon steel
Microalloying, slab directly-heated shove charge rolling are carried out during refining, the technologies such as hot rolling controlled rolling and controlled cooling solve ordinary low-alloy steel and easily go out
Existing processability is bad, low strength and hardness unevenly have the problems such as soft spots.Structural steel (Q345B-JG) of the invention is adopted
It is produced with the steelshop and hot tandem for possessing LF and AR refining equipment.
Beneficial effect
(1) present invention use in carbon add microalloy to design (Nb:0.009-0.017%), guarantee coil of strip have it is excellent cold plus
Work and excellent toughness, while realizing straight dress, energy-saving and emission-reduction.
(2) present invention use the simple refining treatment of AR, it is ensured that argon blowing time and ensure steel inclusion float sufficiently, steel
Matter degree of purity is high；
(3) hot rolling of the present invention uses higher heating temperature and Controlled Rolling And Controlled Cooling, improves steel mechanics performance and processing
Service performance.
(4) steel of the present invention carbon content with higher and excellent in toughness avoid medium carbon steel and roll rear intensity, hardness unevenness
Uniform buckling performance problem of poor improves processing performance, surface hardness and logical volume performance uniformity；Higher elongation percentage improves
Its toughness, lower yield tensile ratio improve its processing efficiency, while improving its resistance to shock；Financial accounting ton steel cost compared with
General common low-carbon technique reduces by 63 yuan/ton of cost, monthly up to a million for company's cost efficiency.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiment 1
(1) ingredient designs
The designing chemical composition of Q345B-JG steel are as follows:, C:0.14~0.19%, Si:0.05~0.25%, Mn:0.90~
1.30%, P≤0.025%, S≤0.008%, Als:0.010~0.060%, Nb:0.007~0.018%, surplus be Fe and
Inevitable impurity.
The technological process of production are as follows: through desulfurizing iron, bessemerize, LF and AR refining, continuous casting, the straight dress of heat, soaking, roughing,
Finish rolling section cooling, batches, cools down factory.
(2) smelting technique
Desulfurizing iron is to [S]≤0.008%；
Converter smelting bottom blowing is switched using nitrogen argon；Tapping slag-stopping tapping, the quantity of slag under strict control converter；Steel alloying is matched out
Add containing Si, Mn alloy and carburant；It is required that steel ladle bottom argon blowing is good；
Continuous casting is cast using whole process protection；TL=1514 DEG C of liquidus temperature, middle 1524 DEG C of Baogang's water target temperature.Crystallization
Carbon covering slag in the use of device covering slag.
(3) steel slab rolling technique
For slab using straight dress, hot charging shove charge, cold base enters the execution of stove heating technique.
1 heating technique parameter of table
Note: time inside furnace and soaking time are heated just for cold base, and directly-heated dress base soaking zone residence time control target >=
16min。
2 rolling technological parameter of table
Table 3U type cooling technique parameter (U-shaped cooling can effectively adjust volume header tail performance uniformity to Q345B-JG's)
Table 4Q345B-JG mechanics properties testing result
Table 5Q345B-JG processes tubulation finished product mechanics properties testing result
The present embodiment Q345B-JG, which has, it can be seen from table 4 and table 5 is suitble to Q345B intensity, high tenacity and excellent weldering
Performance is connect, rear road cracking performance problem not up to standard does not occur by slitting, the molding of processing tubulation, welding section performance detection, processes
Tubulation and bending and molding are good, and finished product welding section performance detection tension reaches 470MP~560MP after processing tubulation molding, extend
Rate reaches 2,1% or more, and less than 0.88, -20 ° low-temperature impact test of yield tensile ratio detects average 120J, meets low yield strength ratio, height
Intensity, high-ductility steel structural steel Q345B-JG standard requirements.Avoid low-carbon, high manganese design slitting distortion, processing tubulation at
The problems such as type is bad, yield tensile ratio is high after tubulation, welding section performance detection is not up to standard, carbon, low manganese add a little micro alloyed steel in
20% or more is reduced with the Quality Design production cost of controlled rolling, the control means such as cold.Financial accounting ton steel cost is low compared with general common
Carbon technique reduces by 63 yuan/ton of cost, monthly up to a million for company's cost efficiency.
Claims (10)
1. a kind of production method of low-cost and high-performance structural steel, comprising:
(1) ingredient is designed: by mass percentage, C:0.14~0.19%, Si:0.05~0.25%, Mn:0.90~1.30%, P
≤ 0.025%, S≤0.008%, Als:0.010~0.060%, Nb:0.007~0.018%, surplus is for Fe and unavoidably
Impurity；
(2) through desulfurizing iron, bessemerize, LF and AR refining, continuous casting, heat straight dress, soaking, roughing, finish rolling, section cooling, volume
Take, cool down factory to get.
2. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the desulfurizing iron in (2) is to S≤0.008%.
3. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the converter smelting bottom blowing in (2) is switched using nitrogen argon, using slag-stopping tapping.
4. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the LF in (2) and AR refining carries out trimming by step (1) component requirements.
5. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the continuous casting in (2) specifically: it is cast using whole process protection, TL=1514 DEG C of liquidus temperature, middle Baogang's water target temperature
1524 DEG C, crystallizer protecting residue use in carbon covering slag.
6. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the technological parameter that the heat in (2) directly fills are as follows: 1200~1220 ± 30 DEG C of tapping temperature, time inside furnace is 150~200min.
7. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the technological parameter of the soaking in (2) are as follows: time >=16min.
8. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the entrance reference temperature of the roughing in (2) is 1210 ± 30 DEG C；The entrance reference temperature of finish rolling is 1040 ± 30 DEG C.
9. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: the step
Suddenly the coiling temperature in (2) is 630~640 ± 20 DEG C.
10. a kind of production method of low-cost and high-performance structural steel according to claim 1, it is characterised in that: described
Back segment cooling and U-shaped cooling are cooled in step (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295710.6A CN109338239A (en) | 2018-11-01 | 2018-11-01 | A kind of production method of low-cost and high-performance structural steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811295710.6A CN109338239A (en) | 2018-11-01 | 2018-11-01 | A kind of production method of low-cost and high-performance structural steel |
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| CN109338239A true CN109338239A (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811295710.6A Pending CN109338239A (en) | 2018-11-01 | 2018-11-01 | A kind of production method of low-cost and high-performance structural steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458360A (en) * | 2020-10-27 | 2021-03-09 | 武汉钢铁有限公司 | Production method of hot continuous rolling plate with low residual stress for bridge U rib |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177415A (en) * | 2015-08-14 | 2015-12-23 | 河北钢铁股份有限公司 | Ultrahigh-strength hot-rolled Q and P steel and production method thereof |
| KR20160149647A (en) * | 2015-06-18 | 2016-12-28 | 현대제철 주식회사 | Shape steel and manufacturing method thereof |
| CN108660381A (en) * | 2018-08-10 | 2018-10-16 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection |
| CN108715970A (en) * | 2018-04-10 | 2018-10-30 | 宁波钢铁有限公司 | A kind of preparation method of high-intensity and high-tenacity packaging tie steel NG01K |
-
2018
- 2018-11-01 CN CN201811295710.6A patent/CN109338239A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160149647A (en) * | 2015-06-18 | 2016-12-28 | 현대제철 주식회사 | Shape steel and manufacturing method thereof |
| CN105177415A (en) * | 2015-08-14 | 2015-12-23 | 河北钢铁股份有限公司 | Ultrahigh-strength hot-rolled Q and P steel and production method thereof |
| CN108715970A (en) * | 2018-04-10 | 2018-10-30 | 宁波钢铁有限公司 | A kind of preparation method of high-intensity and high-tenacity packaging tie steel NG01K |
| CN108660381A (en) * | 2018-08-10 | 2018-10-16 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458360A (en) * | 2020-10-27 | 2021-03-09 | 武汉钢铁有限公司 | Production method of hot continuous rolling plate with low residual stress for bridge U rib |
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Application publication date: 20190215 |