CN108441782A - A kind of carbon equivalent high corrosion-resistant steel bar and its heat treatment method - Google Patents
A kind of carbon equivalent high corrosion-resistant steel bar and its heat treatment method Download PDFInfo
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- CN108441782A CN108441782A CN201810164776.5A CN201810164776A CN108441782A CN 108441782 A CN108441782 A CN 108441782A CN 201810164776 A CN201810164776 A CN 201810164776A CN 108441782 A CN108441782 A CN 108441782A
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- steel bar
- carbon equivalent
- high corrosion
- resistant steel
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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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention discloses a kind of carbon equivalent high corrosion-resistant steel bar and its heat treatment method, the chemical composition composition and mass percent of the carbon equivalent high corrosion-resistant steel bar are as follows：C：0.11~0.15%, Si≤0.56%, Mn≤0.45%, Cr：3.2~4.3%, Ni：0.5~0.6%, Mo：0.78~1.1%, Cu：0.13~0.27%, P≤0.05%, Nb：0.01~0.14%, Zn：0.01~0.15%, Ti：0.03~0.15%, remaining is Fe and inevitable impurity；The heat treatment method will need the carbon equivalent high corrosion-resistant steel bar that is heat-treated and be put into heap in burial pit together with rigid offline hot-rolled reinforced bar cold, 310~710 DEG C of stacking temperature, heap cool time >=1 hour.Reinforcing bar of the present invention has higher corrosion resistance and excellent mechanical property, and production cost is low, has a extensive future.
Description
Technical field
The invention belongs to technical field of metal material, and in particular to a kind of carbon equivalent high corrosion-resistant steel bar and its heat treatment side
Method.
Background technology
With the continuous development of large complicated building structure, requirements at the higher level are proposed to the intensity and corrosion resistance of reinforcing bar.
Currently, HRB400 screw-thread steels, which are market, applies most reinforcing bars, but its intensity and corrosion resistance are not well positioned to meet high property
The requirement that can be built.Austenitic stainless steel has preferable corrosion resistance and toughness plasticity, but its intensity is insufficient, and price is high
It is expensive.In addition, it is national strategy resource that austenitic stainless steel, which contains precious metal Ni, Ni, thus by the protection of various countries outlet or
Limitation.Although ferritic stainless steel also has excellent corrosion resistance, since its Cr content is higher（Generally >=13 wt%）, Ni
Content is less, and mechanical property and weldability are poor.Meanwhile ferritic stainless steel requires C content low as possible, otherwise
Martensite or supersaturated solid solution can be generated after hot rolling under conditions of air-cooled, if returned in subsequent heat treatment stove
Fire processing, the production cycle is longer, and cost is higher.In addition, after C content reduces to a certain extent in steelmaking process, if continuing to drop C
Production cost can be dramatically increased.
Therefore, a kind of with short production cycle, production cost low carbon equivalent high corrosion-resistant steel bar and its heat treatment method are developed,
There is very wide application prospect.
Invention content
The object of the present invention is to provide a kind of C content >=0.11wt%, and have both the steel of preferable corrosion resistance and mechanical property
Muscle, while the reinforcing bar contains only a small amount of strategic resource Ni elements.The formation rolling technique of the carbon equivalent high corrosion-resistant steel bar uses
Conventional hot rolling technology.
The technical solution used in the present invention is as follows：A kind of carbon equivalent high corrosion-resistant steel bar, the chemical composition of the reinforcing bar
And mass percent is as follows：C：0.11~0.15%, Si≤0.56%, Mn≤0.45%, Cr：3.2~4.3%, Ni：0.5~0.6%,
Mo：0.78~1.1%, Cu：0.13~0.27%, P≤0.05%, Nb：0.01~0.14%, Zn：0.01~0.15%, Ti：0.03~
0.15%, remaining is Fe and inevitable impurity.
Bar gauge of the present invention≤φ 80mm.
Steel Bar Tensile Strength >=720MPa of the present invention, yield strength >=610MPa, elongation after fracture >=15%, salt tolerant
Mist corrosive nature improves 5 times or more compared with HRB400.
The present invention also provides a kind of heat treatment methods of above-mentioned carbon equivalent high corrosion-resistant steel bar, it would be desirable to the height of heat treatment
Carbon equivalent corrosion-resistant steel bar is put into that heap in burial pit is cold together with just offline hot-rolled reinforced bar, the stacking of the offline hot-rolled reinforced bar
For temperature at 310~710 DEG C, the gross mass of offline hot-rolled reinforced bar is 3 times or more of required heat-treated steel bar；When stacking, exist in advance
One layer of burial pit bottom place mat offline hot-rolled reinforced bar identical with required heat-treated steel bar quantity, then by required heat- treated steel
Muscle loads in mixture with just offline hot-rolled reinforced bar and is put into burial pit.
Heap cool time >=1 hour of the present invention.
Diameter >=20mm of just offline hot-rolled reinforced bar of the present invention.
Just offline hot-rolled reinforced bar diameter phi of the present invention1With required heat-treated steel bar diameter phi2Meet following mathematics to close
System：|φ1-φ2|≤3φ2And | φ1-φ2|≤3φ1。
Each component effect in alloy of the present invention is as follows：
C：Although the intensity of Fe-Cr alloys can be improved, C also reduces the plasticity, toughness and corrosion resistance of Fe-Cr alloys simultaneously
Can, deteriorate welding performance, therefore C content is reduced as possible in the alloy of the present invention.
Si：With deoxidation, while a part of Si exists with solution, can improve the yield strength of alloy and resist
Tensile strength also has certain promotion to corrosion resistance.But Si equally also reduces Fe-Cr alloy plasticities and toughness.So
Si contents are unsuitable excessively high.
Mn：Has the function of deoxidation and except S, while a part of Mn exists with solution, can improve the surrender of alloy
Intensity and tensile strength, still, Mn equally also reduce Fe-Cr alloy plasticities and toughness.So Mn contents are unsuitable excessively high.
P：It can play the role of improving corrosion resistance, but P also greatly reduces alloy plasticity and toughness simultaneously, especially carries
The crisp transition temperature of high-ductility, generates cold short phenomenon.So P content is unsuitable excessively high.
Cr：Corrosion resistance can be significantly improved, while can also improve yield strength and tensile strength to a certain degree, but content
It is excessively high to drop low-alloyed plasticity and toughness, while can also improve C equivalents, deteriorate welding performance.So controlling Cr certain
In range.
Ni：A small amount of addition can improve the plasticity, toughness and intensity of alloy, while can also improve corrosion resistance.
Mo：The corrosion resistance of alloy can be improved, resistance to Cl- corrosion and anti-pitting effect are especially improved.Mo can be with
C in alloy is combined, and is formed the carbide of Mo, can also be played the role of crystal grain thinning while eliminating C, is closed to improve
Golden intensity.But if Mo can drop low-alloyed plasticity and toughness with solution too high levels.
Cu：It can play the role of preferable corrosion-resistant, when a small amount of addition can also improve the plasticity and intensity of alloy.But
It is when too high levels, then to drop low-alloyed plasticity and toughness instead.
Nb：C/N compounds can be formed with interstitial atoms such as C, N in alloy, crystal grain thinning improves welding performance and deep-draw
Performance can also play solution strengthening effect with atom existing for solution.
Zn：Anti-impact preferable corrosion-resistant, while that alloy can be significantly improved when a small amount of addition can not only be played the role of
Performance is hit, galvanized sheet is usually used in, but damages the mechanical property of alloy again when too high levels.
Ti：It is carbide, the C element in steel can be fixed, avoids being dissolved excessively in ferrite matrix
C。
Corrosion-resistant be often noticeably greater than that the compound addition of corrosion resisting alloy element is played the role of individually is added, and is had similar
The effect of 1+1 ＞ 2.
It is using the advantageous effect of above-mentioned technical proposal：Carbon equivalent high corrosion-resistant steel bar of the present invention and existing austenite are not
Rust steel compares with ferritic stainless steel, the expensive alloying elements contained are few, and with higher C content and relatively low Cr contents
In the case of, also there is fine corrosion resistance and excellent mechanical property；Meanwhile the performance of the carbon equivalent high corrosion-resistant steel bar is apparent
Better than HRB400 screw-thread steels.
Specific implementation mode
Technical scheme of the present invention is further elaborated below in conjunction with several embodiments, those skilled in the art should be bright
, the embodiment, which is only to aid in, understands the present invention, should not be regarded as a specific limitation of the invention.
The alloying component mass percentage added in 1~4 carbon equivalent high corrosion-resistant steel bar of the embodiment of the present invention such as 1 institute of table
Show, surplus is Fe and inevitable impurity.
The heat treatment process parameter of Examples 1 to 4 is shown in Table 2, with comparative example（HRB400）Mechanics and corrosion resistance pair
Than being shown in Table 3.Corrosion resistance test uses salt spray test method.
Embodiment 1
Its chemical composition of the present embodiment carbon equivalent high corrosion-resistant steel bar composition and mass percentage are shown in Table 1, performance test results
It is shown in Table 3.
The heat treatment method of carbon equivalent high corrosion-resistant steel bar is as follows：To need the carbon equivalent high corrosion-resistant steel bar that is heat-treated with
Just offline hot-rolled reinforced bar cold, the offline hot-rolled reinforced bar that is put into heap in burial pit together（Diameter 35mm）Stacking temperature be 550 DEG C,
The gross mass of offline hot-rolled reinforced bar is required heat-treated steel bar（Diameter 64mm）4 times；When stacking, in advance in burial pit bottom
One layer of place mat offline hot-rolled reinforced bar identical with required heat-treated steel bar quantity, then by required heat-treated steel bar with just it is offline
Hot-rolled reinforced bar, which loads in mixture, is put into burial pit, heap cool time 1.5 hours.
Embodiment 2
Its chemical composition of the present embodiment carbon equivalent high corrosion-resistant steel bar composition and mass percentage are shown in Table 1, performance test results
It is shown in Table 3.
The heat treatment method of carbon equivalent high corrosion-resistant steel bar is as follows：To need the carbon equivalent high corrosion-resistant steel bar that is heat-treated with
Just offline hot-rolled reinforced bar cold, the offline hot-rolled reinforced bar that is put into heap in burial pit together（Diameter 40mm）Stacking temperature be 420 DEG C,
The gross mass of offline hot-rolled reinforced bar is required heat-treated steel bar（Diameter 10mm）5 times；When stacking, in advance in burial pit bottom
One layer of place mat offline hot-rolled reinforced bar identical with required heat-treated steel bar quantity, then by required heat-treated steel bar with just it is offline
Hot-rolled reinforced bar, which loads in mixture, is put into burial pit, heap cool time 2.5 hours.
Embodiment 3
Its chemical composition of the present embodiment carbon equivalent high corrosion-resistant steel bar composition and mass percentage are shown in Table 1, performance test results
It is shown in Table 3.
The heat treatment method of carbon equivalent high corrosion-resistant steel bar is as follows：To need the carbon equivalent high corrosion-resistant steel bar that is heat-treated with
Just offline hot-rolled reinforced bar cold, the offline hot-rolled reinforced bar that is put into heap in burial pit together（Diameter 20mm）Stacking temperature be 710 DEG C,
The gross mass of offline hot-rolled reinforced bar is required heat-treated steel bar（Diameter 80mm）3 times；When stacking, in advance in burial pit bottom
One layer of place mat offline hot-rolled reinforced bar identical with required heat-treated steel bar quantity, then by required heat-treated steel bar with just it is offline
Hot-rolled reinforced bar, which loads in mixture, is put into burial pit, heap cool time 1 hour.
Embodiment 4
Its chemical composition of the present embodiment carbon equivalent high corrosion-resistant steel bar composition and mass percentage are shown in Table 1, performance test results
It is shown in Table 3.
The heat treatment method of carbon equivalent high corrosion-resistant steel bar is as follows：To need the carbon equivalent high corrosion-resistant steel bar that is heat-treated with
Just offline hot-rolled reinforced bar cold, the offline hot-rolled reinforced bar that is put into heap in burial pit together（Diameter 35mm）Stacking temperature be 310 DEG C,
The gross mass of offline hot-rolled reinforced bar is required heat-treated steel bar（Diameter 40mm）4 times；When stacking, in advance in burial pit bottom
One layer of place mat offline hot-rolled reinforced bar identical with required heat-treated steel bar quantity, then by required heat-treated steel bar with just it is offline
Hot-rolled reinforced bar, which loads in mixture, is put into burial pit, heap cool time 4 hours.
1 embodiment 1-4 carbon equivalent high corrosion-resistant steel bar chemical compositions of table form and mass percentage
Ingredient surplus is Fe and inevitable impurity in table 1.
2 embodiment 1-4 carbon equivalent high corrosion-resistant steel bar heat treatment process parameters of table
The performance comparison of table 3 embodiment 1-4 carbon equivalent highs corrosion-resistant steel bar and HRB400 reinforcing bars
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to the present invention into
Go detailed description, it will be understood by those of ordinary skill in the art that：It can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, the right that should all cover in the present invention is wanted
It asks in range.
Claims (7)
1. a kind of carbon equivalent high corrosion-resistant steel bar, which is characterized in that the chemical composition and mass percent of the reinforcing bar are as follows：C：
0.11~0.15%, Si≤0.56%, Mn≤0.45%, Cr：3.2~4.3%, Ni：0.5~0.6%, Mo：0.78~1.1%, Cu：
0.13~0.27%, P≤0.05%, Nb：0.01~0.14%, Zn：0.01~0.15%, Ti：0.03~0.15%, remaining for Fe and
Inevitable impurity.
2. a kind of carbon equivalent high corrosion-resistant steel bar according to claim 1, which is characterized in that the bar gauge≤φ
80mm。
3. a kind of carbon equivalent high corrosion-resistant steel bar according to claim 1, which is characterized in that the Steel Bar Tensile Strength >=
720MPa, yield strength >=610MPa, elongation after fracture >=15%, salt spray corrosion resistance improve 5 times or more compared with HRB400.
4. based on a kind of heat treatment method of carbon equivalent high corrosion-resistant steel bar described in claim 1-3 any one, feature
It is, it would be desirable to it is cold that the carbon equivalent high corrosion-resistant steel bar of heat treatment is put into heap in burial pit together with just offline hot-rolled reinforced bar,
For the stacking temperature of the offline hot-rolled reinforced bar at 310~710 DEG C, the gross mass of offline hot-rolled reinforced bar is required heat-treated steel bar
3 times or more；When stacking, in advance in one layer of offline hot-rolled steel identical with required heat-treated steel bar quantity of burial pit bottom place mat
Then required heat-treated steel bar is loaded in mixture with just offline hot-rolled reinforced bar and is put into burial pit by muscle.
5. a kind of heat treatment method of carbon equivalent high corrosion-resistant steel bar according to claim 4, which is characterized in that the heap
Cool time >=1 hour.
6. a kind of heat treatment method of carbon equivalent high corrosion-resistant steel bar according to claim 4, which is characterized in that described
The diameter phi of rigid offline hot-rolled reinforced bar1≥20mm。
7. a kind of heat treatment method of carbon equivalent high corrosion-resistant steel bar according to claim 4-6 any one, feature
It is, the rigid offline hot-rolled reinforced bar diameter phi1With required heat-treated steel bar diameter phi2Meet following mathematical relation：|φ1-
φ2|≤3φ2And | φ1-φ2|≤3φ1。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115449711A (en) * | 2022-09-13 | 2022-12-09 | 佛冈达味特钢有限公司 | Corrosion-resistant hot-rolled steel bar and preparation method thereof |
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| CN107460412A (en) * | 2017-07-26 | 2017-12-12 | 河钢股份有限公司承德分公司 | A kind of high-strength anticorrosion steel and its milling method |
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| CN102363832A (en) * | 2011-11-07 | 2012-02-29 | 天津钢铁集团有限公司 | Production technology of finish-rolled ribbed bars |
| US20150159255A1 (en) * | 2013-03-13 | 2015-06-11 | Commercial Metals Company | System and method for stainless steel cladding of carbon steel pieces |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115449711A (en) * | 2022-09-13 | 2022-12-09 | 佛冈达味特钢有限公司 | Corrosion-resistant hot-rolled steel bar and preparation method thereof |
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