CN107254628B - A kind of resistance to SO2 and the construction(al)steel and production method of the corrosion of low chlorine ion concentration - Google Patents
A kind of resistance to SO2 and the construction(al)steel and production method of the corrosion of low chlorine ion concentration Download PDFInfo
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- CN107254628B CN107254628B CN201710375059.2A CN201710375059A CN107254628B CN 107254628 B CN107254628 B CN 107254628B CN 201710375059 A CN201710375059 A CN 201710375059A CN 107254628 B CN107254628 B CN 107254628B
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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
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of resistance to SO2And the construction(al)steel and production method of low chlorine ion concentration corrosion, belong to Architectural Corrosion steel technical field.The composition of steel weight percent are as follows: C:0.005-0.05%, Si:0.2-0.6%, Mn:0.6-0.8%, P:0-0.08%, S≤0.01%, Cr:2.0-4%, N:0.01-0.02%；According to different performance requirements, which can also contain P:0.06-0.08%, Cu:0.25-1%, Ni:0.2-0.5, Mo:0.1-0.8%, Al:0.5-1.0%, surplus Fe.A kind of construction(al)steel of excellent corrosive nature is obtained by selected multiple groups optimizing components and process optimization using vacuum metling-zerolling-controlled rolling and controlled cooling production method.The advantage is that concrete pore solutions pH value declines in the carbonized, low ph value Pore Solution environment is reduced under the stability condition of passivating film, can be in SO2And reach reduction corrosion rate in low chlorine ion concentration environment and the concrete of carbonization up to one times of the above object, to improve the durability of the life cycle management of building structure.
Description
Technical field
Steel technical field is used the invention belongs to corrosion-resistant, in particular, provides a kind of resistance to SO2And low Cl-1Concentration corrosion is built
It builds and uses steel and production method, be suitable for resistance to SO2And highway, bridge of low chlorine ion concentration corrosive environment etc. uses, especially in height
Using effect is best in the concrete of alkalinity.
Background technique
Ni-Cu-P system, Cu-Cr system and Cr-AL system etc. are the component systems for the corrosion-resisting steel that China has developed.China is in work
Under sparetime university's gas, bridge, highway, marshland engineering etc. the environmental condition of natural environment very severe using common building with steel
Through being unable to satisfy the requirement of its life cycle management.
1) what domestic current construction timber was all made of is sea sand, is rich in the chloride ion of low concentration, long in the mixed pure land
Phase corrodes steel matrix, and the life cycle of steel can be made to substantially reduce.
2) the more severe use environment of the environment such as salt-soda soil, snow-melting agent, industrial waste gas needs both to have anti-industrial atmosphere
The steel grade of corrosion and the composite performance of low-level chlorinated ion etching, therefore develop a kind of resistance to SO of this complex function2And low Cl-1It is dense
The construction(al)steel for spending corrosion is particularly important.
Under normal conditions, if chlorine ion concentration is extremely low in concrete pore solutions, rebar surface passivating film substantially will not be by
It destroys, while under the conditions of high alkalinity, also has itself certain repair ability after passivating film is impaired, can make up again.Work as coagulation
Chloride ion reaches a certain concentration in the liquid of soil pores, and have reaction occur other necessary condition (water and oxygen) when reinforcing bar can just send out
It gets rusty erosion.Therefore, people are causing the minimum chlorine ion concentration of reinforcement corrosion to be referred to as to cause " critical value " of reinforcement corrosion.It examines
Consider the factors such as the heterogeneity of the complexity of concrete system, the diversity of corrosion influence factors and test method, causes
The chloride concentration " critical value " of reinforcement corrosion is still without unified numerical value.Once chlorine ion concentration has reached the critical value of steel bar corrosion
More than, ordinary steel gradually starts to corrode, and the expansion of rusty scale bulk product leads to concrete cracking, until Building life cycle fails.This
A kind of resistance to SO of complex function is developed in invention2And low Cl-1The construction(al)steel of concentration corrosion, improves the same of reinforcing steel tarnishing criticality value
When, steel bar corrosion rate is reduced, to extend the life cycle management of building.
Summary of the invention
The purpose of the present invention is to provide a kind of resistance to SO2And low Cl-1The construction(al)steel and production method of concentration corrosion, pass through
After certain ingredient addition and multiple groups optimizing components, resistance to SO2And low Cl-1Concentration performance obtains a degree of raising and changes
It is kind.
A kind of resistance to SO of the invention2And low Cl-1The construction(al)steel component weight percentages of concentration corrosion are as follows: C:0.005-
0.05%, Si:0.2-0.6%, Mn:0.6-0.8%, P:0-0.08%, S≤0.01%, Cr:2.0-4%, N:0.01-
0.02%, surplus Fe.
A kind of resistance to SO of the invention2And low Cl-1The construction(al)steel component weight percentages of concentration corrosion are as follows: C:0.005-
0.05%, Si:0.2-0.6%, Mn:0.6-0.8%, P:0.06-0.08%, S≤0.01%, Cr:2.0-4%, Cu:0.25-
1%, Ni:0.2-0.5, N:0.01-0.02%, surplus Fe.
A kind of resistance to SO of the invention2And low Cl-1The construction(al)steel component weight percentages of concentration corrosion are as follows: C:0.005-
0.05%, Si:0.2-0.6%, Mn:0.6-0.8%, P :≤0.03%, S≤0.01%, Cr:2.0-4%, Mo:0.1-
0.8%, Al:0.5-1.0%, N:0.01-0.02%, surplus Fe.
C content is excessively high, is easily formed the Carbide Precipitation of more corrosion cells and chromium, accelerated corrosion, therefore, carbon content
Range be 0.005-0.05%；
Cr is main corrosion-resistant the element, [Cl in system-]/[OH-] ratio it is lower under the conditions of, it is in steel surface shape
At fine and close FexCr1-xThe protective passivating film such as OH, Cr content is higher, and the compactness of passivating film is firmer, it is contemplated that at
Originally, after controlling the factors such as cold, after a large amount of cost proportioning test and controlled rolling and controlled cooling experimental study, preferred Cr content range
2.0-4%.
Cu is the element of preferable weather-resistant and resisting corrosion of chlorine ion, resistance to the use of that can make with P element
Corrosive nature greatly improves, and it is generally 2:1 according to Cu:Ni ratio in steel grade that it is crisp, which to be easy to occur Cu in hot procedure in order to prevent,
Or 1:1, add a certain amount of Ni element.Ni can significantly improve the self-corrosion point of steel matrix simultaneously, and can stablize Ovshinsky
Body, so that austenite is more uniform.
Mo is good anti-spot corrosion element, and the addition of Mo can significantly improve pitting resistance of the Cr steel in chloride environment
Can, the present invention selects the Mo of 0.1-0.8%, for the corrosion resisting property in more harsh environment.
Al element has good atmospheric corrosion resistance, and the matching use of it and Cr can significantly improve the corruption of chromium steel
Corrosion energy, when Cr:AL ratio is 2-8, the two mixes addition effect more preferably.
A kind of resistance to SO2And low Cl-1The production method of the construction(al)steel of concentration corrosion, which is characterized in that production technology and control
The technical parameter of system is as follows:
Desulfurizing iron pre-process → push up bottom richness blow converter smelting → LF furnace refining → full guard continuous casting → square billet having a size of
150*150mm → heating stove heating → controlled rolling and control cooling → cold bed are air-cooled；Heat stove heating, austenitizing, alloy
Element solid solution, solid solubility temperature are 1200 DEG C ± 20 DEG C；Controlled rolling and controlled cooling is used between rolling, rolling temperature control is in two-phase section range
Interior, rolling temperature control interval range is 830 DEG C -880 DEG C, and the cold range of control after rolling is 450-830 DEG C, with cooling rate 50-200
DEG C/s speed is cooled to structural transformation section, structural transformation is carried out in a manner of air-cooled.
Concrete pore solutions pH value declines after carbonization, can reach 8.5-9.0 when serious, low ph value Pore Solution environment reduces
The stability of passivating film.After serious carbonization occurs for concrete, concrete reduces the protective effect of reinforcing bar.Corrosion reaction
[Cl in system-]/[OH-] ratio be reinforcement corrosion a main critical point and factor, general concrete carbonization after, low
Under conditions of chlorine ion concentration, the ratio is also larger, seriously affects the durability of the life cycle management of construction(al)steel.Of the invention
After construction(al)steel adds the elements such as Cu, P, Ni or Mo, Al according to a certain percentage simultaneously by the Cr element of addition 2-4%,
[Cl-]/[OH-] ratio be 0.6-0.7 start to corrode, while corrosion start after can be in low chlorine ion concentration environment and carbonization
Concrete in reach reduce corrosion rate up to one times of the above object, to improve the durable of building structure life cycle management
Property.
It is an advantage of the current invention that concrete pore solutions pH value declines in the carbonized, low ph value Pore Solution environment is reduced
It, can be in SO under the stability condition of passivating film2And reach reduction corrosion in low chlorine ion concentration environment and the concrete of carbonization
Rate reaches at least one times of the above object, to improve the durability of the life cycle management of building structure.
Detailed description of the invention
Fig. 1 is construction(al)steel bainite microstructure picture figure provided in an embodiment of the present invention.
Fig. 2 is the displaing micro photo figure of construction(al)steel ferrite+pearlite provided in an embodiment of the present invention.
Fig. 3 is corrosive nature figure of the construction(al)steel provided in an embodiment of the present invention in simulation corrosive liquid.
Specific embodiment
Below by embodiment, the present invention will be further described:
A kind of resistance to SO2And low Cl-1The chemical component and mass percent of the construction(al)steel of concentration corrosion are as follows:
Ingredient 1:C:0.005:%, Si:0.25%, Mn:0.65%, P:0.05%, S:0.005%, Cr:3.0%, N:
0.01%, surplus Fe.
Ingredient 2:C:0.05:%, Si:0.6%, Mn:0.8%, P:0.08%, S:0.005%, Cr:2.0%, N:
0.02%, Cu:0.25%, Ni:0.2%, surplus Fe.
Ingredient 3:C:0.04:%, Si:0.5%, Mn:0.7%, P:0.07%, S:0.005%, Cr:2.5%, N:
0.02%, Cu:0.3%, Ni:0.2%, surplus Fe.
Ingredient 4:C:0.03:%, Si:0.4%, Mn:0.6%, P:0.02%, S:0.005%, Cr:4.0%, N:
0.015%, Mo:0.8%, Al:0.5%, surplus Fe.
Ingredient 5:C:0.02:%, Si:0.5%, Mn:0.6%, P:0.03%, S:0.005%, Cr:3.0%, N:
0.015%, Mo:0.6%, Al:1.0%, surplus Fe.
Production technology are as follows: desulfurizing iron pre-processes → push up bottom richness blow converter smelting → LF furnace refining → full guard continuous casting → side
Base is air-cooled having a size of 150 × 150mm → heating stove heating → controlled rolling and control cooling → cold bed；Heat stove heating, Ovshinsky
Body, alloying element solid solution, solid solubility temperature are 1200 DEG C；Controlled rolling and controlled cooling is used between rolling, rolling temperature control is in two-phase section model
In enclosing, rolling temperature control is 850 DEG C, and the cold temperature of control after rolling is 750 DEG C, is cooled to tissue with cooling rate 100 DEG C/s speed
Change section, structural transformation is carried out in a manner of air-cooled, is organized as shown in Fig. 1, Fig. 2.
Corrosion resisting property passes through period soaking corrosion testing machine in the NaHSO of 0.01mol/L3Solution and low concentration Cl-1It is rotten in solution
Erosion 72 hours, experimental temperature is 45 DEG C, humidity 70%, its corrosive nature is all satisfied 50% performance of carbon steel < and wants as the result is shown
It asks, as shown in Figure 3.
Claims (3)
1. a kind of resistance to SO2And the construction(al)steel of low chlorine ion concentration corrosion, it is characterised in that: component weight percentages are as follows: C:
0.005-0.05%, Si:0.2-0.6%, Mn:0.6-0.8%, P:0.06-0.08%, S≤0.01%, Cr:2.0-4%, N:
0.01-0.02%, Cu:0.25-1%, Ni:0.2-0.5%, surplus Fe；
The structure of steel is ferrite+pearlite or ferrite+martensite or bainite；
The steel tarnishing criticality point [Cl-]/[OH-] ratio be 0.6-0.7.
2. a kind of resistance to SO2And the construction(al)steel of low chlorine ion concentration corrosion, it is characterised in that: component weight percentages are as follows: C:
0.005-0.05%, Si:0.2-0.6%, Mn:0.6-0.8%, P :≤0.03%, S≤0.01%, Cr:2.0-4%, N:
0.01-0.02%, Mo:0.1-0.8%, Al:0.5-1.0%, surplus Fe；
The structure of steel is ferrite+pearlite or ferrite+martensite or bainite；
The steel tarnishing criticality point [Cl-]/[OH-] ratio be 0.6-0.7.
3. a kind of production method of construction(al)steel of any of claims 1 or 2, it is characterised in that: production technology and the skill of control
Art parameter is as follows:
Desulfurizing iron pre-processes → pushes up bottom richness blow converter smelting → LF furnace refining → full guard continuous casting → square billet having a size of 150*
150mm → heating stove heating → controlled rolling and control cooling → cold bed are air-cooled；Heat stove heating, austenitizing, alloying element
Solid solution, solid solubility temperature are 1200 DEG C ± 20 DEG C；Controlled rolling and controlled cooling is used between rolling, rolling temperature control is within the scope of two-phase section, control
Rolling temperature section processed range is 830 DEG C -880 DEG C, and the cold range of control after rolling is 450-830 DEG C, with 50-200 DEG C/s of cooling rate
Speed is cooled to structural transformation section, and structural transformation is carried out in a manner of air-cooled.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103805856A (en) * | 2014-03-14 | 2014-05-21 | 武汉钢铁(集团)公司 | Steel for anticorrosion ocean structure with yield strength of more than or equal to 800MPa and production method thereof |
| CN103993229A (en) * | 2014-06-05 | 2014-08-20 | 首钢总公司 | Corrosion-resistant 5Cr steel and production method thereof |
| CN105624586A (en) * | 2015-12-29 | 2016-06-01 | 钢铁研究总院 | Corrosion-resisting steel special for bridge support and suitable for marine environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011021248A (en) * | 2009-07-16 | 2011-02-03 | Jfe Steel Corp | Steel for ship having excellent coating corrosion resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103805856A (en) * | 2014-03-14 | 2014-05-21 | 武汉钢铁(集团)公司 | Steel for anticorrosion ocean structure with yield strength of more than or equal to 800MPa and production method thereof |
| CN103993229A (en) * | 2014-06-05 | 2014-08-20 | 首钢总公司 | Corrosion-resistant 5Cr steel and production method thereof |
| CN105624586A (en) * | 2015-12-29 | 2016-06-01 | 钢铁研究总院 | Corrosion-resisting steel special for bridge support and suitable for marine environment |
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