CN109666783A - A kind of on-line solution method in stainless reinforcing bar production process - Google Patents
A kind of on-line solution method in stainless reinforcing bar production process Download PDFInfo
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- CN109666783A CN109666783A CN201710954679.1A CN201710954679A CN109666783A CN 109666783 A CN109666783 A CN 109666783A CN 201710954679 A CN201710954679 A CN 201710954679A CN 109666783 A CN109666783 A CN 109666783A
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- Prior art keywords
- reinforcing bar
- rolling
- line solution
- temperature
- production process
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Classifications
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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/18—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
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a kind of on-line solution methods in stainless reinforcing bar production process, on-line solution are directly carried out after the completion of billet rolling, rolling tapping temperature control is at 1050 DEG C~1100 DEG C；Waste heat after being rolled using finished product, by wearing water cooling by force online, control reinforcing bar temperature on cooling table is lower than 500 DEG C, then it is normally air-cooled to room temperature, completes online solution treatment, realizes austenite and the of substantially equal target of ferrite content, reinforcement yielding intensity is higher than 500MPa, strong flexor ratio >=1.2.The on-line solution method of the application exploitation, can be realized the continuous production of stainless reinforcing bar, improves production efficiency.
Description
Technical field
The invention belongs to stainless reinforcing bar technical fields more particularly to a kind of high-intensitive, corrosion resistant marine building structure to use
The on-line solution production method of stainless reinforcing bar.
Background technique
Existing ocean structure generally uses hot-rolled ribbed steel bars for ther reinforcement of concrete, anti-chlorine ion corrosion ability with reinforcing bar
Weaker, common engineering active time was differed from 5~10 years, and some even time is shorter, not only caused a large amount of investment waste,
The difficulty for more causing successive projects to rebuild.To solve problems, general general method is using reinforcing bar, river sand and dedicated water
Clay to make concrete, this aspect causes construction investment to increase, and the duration lengthens, and engineering clothes have on the other hand also only been appropriately extended
The time is used as a servant, but is not also solved the problems, such as fundamentally anti-corrosion.Especially on the island far from continent, river sand, fresh water are nervous or do not have
Have, and a large amount of sea sand, seawater cannot use, and cause construction investment huge and the inconvenience in construction.
The reinforcing bar product for how developing chloride ion corrosion in a kind of sea water resistance and sea sand, become reduce ocean engineering difficulty with
Cost, accelerate construction progress a key factor.
Domestic stainless steel industry passes through nearly great development in 30 years, it is already possible to all stainless steels known to production in the world
Series and the trade mark, various stainless steel products have been full of the whole world, select several suitable trades mark for producing reinforcing bar from wherein comb
Product all becomes a kind of possibility from technology and technique.
Development and production go out the two phase stainless steels such as 2205,2506,2507 for the stainless steels such as Britain, Sweden, Japan production power
Reinforcing bar is simultaneously successfully applied to various ocean engineerings, has obtained good using effect and economic benefit.
Domestic two phase stainless steel bar product be used widely by comparative maturity, round steel product, but reinforcing bar product
Also in the stage to be developed.
Existing stainless reinforcing bar is heat-treated in process of production, for example is quenched, and it is strong could to obtain ideal reinforcing bar
Degree, different from the heat treatment of slab, the solid solution of stainless reinforcing bar is all the secondary offline solid solution used, and control difficulty is high, and can increase
Addition sheet reduces production efficiency.
Summary of the invention
For existing offline solid solution craft there are the shortcomings that, the application develops the on-line solution technique of stainless reinforcing bar, real
On-line solution is showed, it is ensured that being carried out continuously for stainless reinforcing bar production improves production efficiency.
The present invention solves the above problems used technical solution are as follows: the on-line solution in a kind of stainless reinforcing bar production process
Method directly carries out on-line solution after the completion of billet rolling, and rolling tapping temperature control is at 1050 DEG C~1100 DEG C；Using at
Waste heat after product rolling, by wearing water cooling, linear velocity 12-13m/s by force online, control reinforcing bar temperature on cooling table is lower than 500
DEG C, it is then normally air-cooled to room temperature, completes online solution treatment, realizes austenite and the of substantially equal mesh of ferrite content
Mark, reinforcement yielding intensity are higher than 500MPa, strong flexor ratio >=1.2.
Specifically, the rolling mill practice be include heating: preheating section≤650 DEG C, heat one section: 950 DEG C~1100 DEG C, add
Two sections: 1100 DEG C~1180 DEG C of heat, soaking zone: 1150 DEG C~1180 DEG C；Total heating time >=2.5 hour；When rolling, setting is opened
Roll 1150 DEG C~1200 DEG C of temperature；Roughing follows the principle that high speed is rolled fastly, reduces temperature drop；The operation of rolling adds induction heating, if
Determining heating temperature is 1050 DEG C, it is ensured that head and tail temperature is uniform.
Preferably, full peeling reconditioning, grinding depth requirement are carried out to steel billet before rolling are as follows: unilateral reconditioning quality be 2mm~
3mm, and reexamine whether surface is defective, and reconditioning satisfaction completely eliminates surface defect after reconditioning.Surface defect is eliminated, is reduced
Final products
Preferably, all fronts import uses rolling guide in the operation of rolling, avoids wiping scuffing；Each frame flying shear cutting head length is appropriate
It lengthens, 3# flying shear investment avoids a piling of steel of blooming.
Further, production blank uses 2205 square billets, and chemical component meets: C≤0.03%, P≤0.030%, S≤
0.020%, Si≤1.00%, 1.00%≤Mn≤2.00%, 4.50%≤Ni≤6.50%, 22.00%≤Cr≤
23.00%, 3.00%≤Mo≤3.50%, 0.14%≤N≤0.18%, remaining is Fe and inevitable impurity element.Have
Help obtain high intensity, high-corrosion resistance makes the requirement for meeting ocean structure engineering.
Compared with the prior art, the advantages of the present invention are as follows: the on-line solution method of the application exploitation can be realized stainless
The continuous production of reinforcing bar is fitted close with rolling mill practice, and compared with secondary offline solid solution craft, the application is using after rolling
Waste heat be quickly dissolved, improve production efficiency.
The stainless reinforcing bar of the application production, rolled yield strength in 500MPa or more, PREN value range is respectively 32~
35, anti-chlorine ion corrosion ability is strong, yield tensile ratio >=1.2.Fully meet offshore engineering structure use.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
Raw material selects 2205 steel billets of domestic enterprises of producing stainless steel production, fraction and weight percent content are as follows: C
≤ 0.03%, P≤0.030%, S≤0.020%, Si≤1.00%, 1.00%≤Mn≤2.00%, 4.50%≤Ni≤
6.50%, 22.00%≤Cr≤23.00%, 3.00%≤Mo≤3.50%, 0.14%≤N≤0.18%, remaining for Fe and
Inevitable impurity element.
Smelting molten steel process route (is blown)-LF essence using intermediate frequency furnace (respectively change steel scrap, alloy)-AOD after first taking off P
Refining-CC continuous casting produces the square billet of 150 × 150 × 6000mm.
The specific production technology of square billet to stainless reinforcing bar is as follows:
1) since the pit of billet surface, crackle, stammerer defect will take finished surface to, in order to ensure finished surface matter
Amount, it is desirable that the full peeling reconditioning of billet surface, grinding depth requirement are as follows: unilateral reconditioning quality is 2mm~3mm, and after reconditioning again
The whether defective presence in surface is checked, if there is also defect, until defect being repaired must completely completely.
2) heating process: setting preheating section≤650 DEG C, 1 section: 950 DEG C~1100 DEG C of heating, 2 sections 1100 DEG C of heating~
1180 DEG C, 1150 DEG C~1180 DEG C of soaking zone；Heating time >=2.5 hour.
3) rolling main points: 1150 DEG C~1200 DEG C of start rolling temperature；Roughing high speed is rolled fastly, reduces temperature drop；Induction heating investment,
1050 DEG C of set temperature, accomplish that head and tail temperature is uniform；All fronts import uses rolling guide, avoids wiping scuffing；Each frame flying shear cutting head
Length suitably lengthens, and 3# flying shear investment avoids a piling of steel of blooming；1050 DEG C~1100 DEG C of finished product temperature.
3, on-line solution is handled
Waste heat after being rolled using finished product makes reinforcing bar temperature on cooling table lower than 500 DEG C, then by wearing water cooling by force online
It normally is air-cooled to room temperature, completes online solution treatment, realizes austenite and the of substantially equal target of ferrite content, and reinforcing bar
Yield strength is also higher than 500MPa, strong flexor ratio >=1.2.
4, acid wash passivation
Using HNO3+ HF nitration mixture acid wash passivation integrated processing technique, reduction metal loss, pickling 24 hours.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (5)
1. a kind of on-line solution method in stainless reinforcing bar production process, it is characterised in that: after the completion of billet rolling directly into
Row on-line solution, rolling tapping temperature control is at 1050 DEG C~1100 DEG C；Waste heat after being rolled using finished product, by wearing water by force online
Cooling, linear velocity 12-13m/s, control reinforcing bar temperature on cooling table are lower than 500 DEG C, are then normally air-cooled to room temperature, complete online
Solution treatment, realize that austenite and the of substantially equal target of ferrite content, reinforcement yielding intensity are higher than 500MPa, strong flexor ratio
≥1.2。
2. the on-line solution method in stainless reinforcing bar production process according to claim 1, it is characterised in that: the rolling
Technique be include heating: preheating section≤650 DEG C, heat one section: 950 DEG C~1100 DEG C, heat two sections 1100 DEG C~1180 DEG C,
1150 DEG C~1180 DEG C of hot arc；Total heating time >=2.5 hour；When rolling: 1150 DEG C~1200 DEG C of start rolling temperature of setting；Roughing
The principle that high speed is rolled fastly is followed, temperature drop is reduced；The operation of rolling adds induction heating, sets heating temperature as 1050 DEG C, it is ensured that head
Tail temperature is uniform.
3. the on-line solution method in stainless reinforcing bar production process according to claim 1, it is characterised in that: right before rolling
Steel billet carries out full peeling reconditioning, grinding depth requirement are as follows: unilateral reconditioning quality is 2mm~3mm, and re-inspection surface is after reconditioning
No defective, reconditioning satisfaction completely eliminates surface defect.
4. the on-line solution method in stainless reinforcing bar production process according to claim 2, it is characterised in that: the operation of rolling
Middle all fronts import uses rolling guide, avoids wiping scuffing；Each frame flying shear cutting head length suitably lengthens, and 3# flying shear investment avoids out
Fresh idea piling of steel.
5. the on-line solution method in stainless reinforcing bar production process according to claim 1, it is characterised in that: production blank
Using 2205 square billets, chemical component meets: C≤0.03%, P≤0.030%, S≤0.020%, Si≤1.00%, 1.00%≤
Mn≤2.00%, 4.50%≤Ni≤6.50%, 22.00%≤Cr≤23.00%, 3.00%≤Mo≤3.50%, 0.14%
≤ N≤0.18%, remaining is Fe and inevitable impurity element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710954679.1A CN109666783A (en) | 2017-10-13 | 2017-10-13 | A kind of on-line solution method in stainless reinforcing bar production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710954679.1A CN109666783A (en) | 2017-10-13 | 2017-10-13 | A kind of on-line solution method in stainless reinforcing bar production process |
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| Publication Number | Publication Date |
|---|---|
| CN109666783A true CN109666783A (en) | 2019-04-23 |
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| CN201710954679.1A Pending CN109666783A (en) | 2017-10-13 | 2017-10-13 | A kind of on-line solution method in stainless reinforcing bar production process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111906153A (en) * | 2020-06-17 | 2020-11-10 | 江苏永钢集团有限公司 | Preparation method of non-quenched and tempered steel for automobile chassis |
| CN114346142A (en) * | 2022-01-18 | 2022-04-15 | 山西太钢不锈钢股份有限公司 | Forging method for improving low-temperature impact toughness of S32750 super duplex stainless steel round steel |
-
2017
- 2017-10-13 CN CN201710954679.1A patent/CN109666783A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111906153A (en) * | 2020-06-17 | 2020-11-10 | 江苏永钢集团有限公司 | Preparation method of non-quenched and tempered steel for automobile chassis |
| CN111906153B (en) * | 2020-06-17 | 2022-04-19 | 江苏永钢集团有限公司 | Preparation method of non-quenched and tempered steel for automobile chassis |
| CN114346142A (en) * | 2022-01-18 | 2022-04-15 | 山西太钢不锈钢股份有限公司 | Forging method for improving low-temperature impact toughness of S32750 super duplex stainless steel round steel |
| CN114346142B (en) * | 2022-01-18 | 2023-07-14 | 山西太钢不锈钢股份有限公司 | Forging method for improving low-temperature impact toughness of S32750 super duplex stainless steel round steel |
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Application publication date: 20190423 |