CN103993229B - A kind of corrosion-resistant steel of 5Cr and production method thereof - Google Patents
A kind of corrosion-resistant steel of 5Cr and production method thereof Download PDFInfo
- Publication number
- CN103993229B CN103993229B CN201410247308.6A CN201410247308A CN103993229B CN 103993229 B CN103993229 B CN 103993229B CN 201410247308 A CN201410247308 A CN 201410247308A CN 103993229 B CN103993229 B CN 103993229B
- Authority
- CN
- China
- Prior art keywords
- corrosion
- steel
- resistant steel
- ferrochrome
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
A kind of corrosion-resistant steel of 5Cr and production method thereof, belong to the corrosion-resistant steel production technical field of high Cr.The chemical composition of steel and mass percent are: C:0.05%-0.07%, Si:0.1%-0.3%, Mn:0.5%-0.8%, P :≤0.02%, S :≤0.01%, Cr:4.5%-5.5%, N:0.02%-0.05%, and surplus is Fe and inevitable impurity.The production technique of this corrosion-resistant steel is: molten iron → converter smelting → interpolation ferrochrome → refining → continuous casting becomes small billet → process furnace heating → controlled rolling → controlled cooling model.By the corrosion-resistant steel of the 5%Cr of this explained hereafter, yield strength reaches 600Mpa level, is organized as the martensitic stucture of thin lath-shaped.Advantage is, excellent anti-chlorine ion corrosion and resistance to industrial atmospheric corrosion performance, and corrosion resistance nature is 2-3 times of carbon steel, requires that the concrete structure that superelevation is strong, durability Design requires uses under can be used for the mal-condition such as ocean environment, swampland; Advantage of lower cost, far below stainless cost, for structure iron for building, is easier to promote the use of.
Description
Technical field
The invention belongs to the corrosion-resistant steel technical field of high Cr, particularly relate to the corrosion-resistant steel of a kind of 5Cr and production method thereof.
Background technology
In the development stage still in the early stage of the corrosion-resistant steel of China, current domestic corrosion-resistant steel mainly has weathering steel (resistance to SO
2corrosion), Steel for sea water service (Cl
-1corrosion).The former is under general industrial environment condition, add a certain amount of Cu-P system alloy and can meet corrosion resistance nature requirement, the latter is then different, because the ability of chlorion through corrosion rusty scale and steel matrix is stronger, in microscopic defect and inclusion position, can through corrosion matrix rapidly, therefore, need under chloride environment to add a large amount of expensive alloys as Ni, Cu etc. and Cr with the use of, just can play the effect delaying steel corrosion.Stainless steel is the representative steel grade of high expensive alloys, however according to its use need not, different to its corrosion proof requirement, so for the particularly construction(al)steel of general use, use a large amount of expensive alloys and complicated explained hereafter very uneconomical.
A kind of ferrous materials that the current a kind of application of the mixed construction(al)steel such as the pure land, bolt supporting Deng Shi China is the most general.Along with the use of steel is different, the extent of corrosion of ordinary steel and durability degree show obvious inferior position: one, China use common building steel cannot meet the requirement in its work-ing life under the envrionment conditions of coastland and the physical environment very severe such as oceanographic engineering, swampland engineering; Its two, what domestic current construction timber all adopted is sea sand, and it is rich in a large amount of chlorions, in the mixed pure land, corrode steel matrix for a long time, and the life-span of steel can be made greatly to reduce; Its three, even if with the addition of Cu, Ni alloy can play the effect delaying to corrode, but its price comparison is expensive, and cost improves greatly, is also difficult to be generalized in construction(al)steel field.Therefore, the strong corrosion resistant concrete reinforcing bars of developing low-cost is particularly important.
Cr element is not only corrosion-resistant element, and it can improve the corrosion potential of steel matrix, and the corrosion resistance of matrix is strengthened, and be again hardening capacity element, it can increase incubation period, postpones perlite, bainite transformation, steel matrix hardening capacity is strengthened.In stainless steel, the addition of Cr is generally 18wt%Cr+10wt%Ni, cost of alloy is higher, therefore corrosion resistance nature is very good, but in construction(al)steel field, because its use is different, different to the requirement of corrosion resistance nature, even corrosive nature is improved 1 times, can make improve 1 times the working life of steel, this greatly reduces the loss of construction(al)steel to iron and steel.
Summary of the invention
The object of the present invention is to provide and the corrosion-resistant steel of a kind of 5%Cr and production method thereof are provided, for the deficiencies in the prior art, this steel grade has excellent anti-chlorine ion corrosion performance and superstrength, high-plasticity, cost, far below stainless steel rebar, is applicable to be applied in the Building class product of complicated ocean environmental requirement superstrength, high-plasticity.
Therefore, the 5wt%Cr steel of the present invention's exploitation, with the purposes that it is special, excellent corrosion resistance nature, relatively low cost, can extend in production application.
Chemical composition and the mass percent of the corrosion-resistant steel of 5Cr of the present invention are: C:0.05%-0.07%, Si:0.1%-0.3%, Mn:0.5%-0.8%, P :≤0.02%, S :≤0.01%, Cr:4.5%-5.5%, N:0.02%-0.05%, and surplus is Fe and inevitable impurity.Without the need to adding other as strong carbide formation microalloy elements such as V, Nb.
The corrosion-resistant steel of 5Cr and production method thereof, comprise the steps:
The production technique of this corrosion-resistant steel is characterised in that: molten iron → converter smelting → interpolation ferrochrome → refining → continuous casting becomes small billet → process furnace heating → controlled rolling → controlled cooling model.The technical parameter controlled in process is:
Process for making and control are: converter terminal adds ferrochrome, and continuous casting adopts full guard cast, Control and Inclusion Removal rank≤1.5 grade.
Steel rolling process and control are: Heating temperature is 1200 DEG C ± 15 DEG C, start rolling temperature 1020 DEG C ± 15 DEG C, final rolling temperature adopt 920 DEG C ± 15 DEG C, and roll the rear water to 350 DEG C ± 20 DEG C worn by force, temperature on cooling table 400 DEG C ± 20 DEG C, to prevent the existence of heterogeneous structure.
The ferrochrome added is low-carbon alloy.
The microstructure of the steel adopting present method to produce is thin lath martensite+a small amount of residual austenite.
Adopt that above method obtains yield strength Rp0.2 >=600Mpa, tensile strength Rm >=900Mpa, unit elongation >=10%, residual austenite content are 3%-7%, corrosion resisting property be Q235 carbon steel 2-3 high-strength and high-plasticity doubly can the corrosion-resistant steel of Steel Concrete.
Strategic point of the present invention is: 1) the present invention is based on common ultra low-carbon steel, the basis of plain carbon stool is added the Cr that massfraction is 5wt%, chromium had both had strong passivation element, there is again stronger hardening capacity, can significantly increase pearlitic incubation period, make the tissue obtaining high strength under lower cooling rate.Therefore, the Cr of 5wt% cannot obtain the residual austenite body tissue of martensite+a small amount of in the process of hot rolling material air cooling, and can improve speed of cooling by the mode of roller repairing, increase incubation period, to obtain martensitic stucture, improve the passivation ability of steel matrix, reduce erosion rate.2) carbide, inclusion etc. as source of corrosion, can accelerate steel corrosion in corrosion process.The present invention for matrix, while guarantee matrix strength, reduces the amount of precipitation of the carbide of Cr with lower carbon content, higher nitrogen content, reduces corrosion particle, suitable minimizing erosion rate.Equally, steel inclusion rank etc. is to reduce inclusion equally, reduces source of corrosion, reduces the erosion rate of steel matrix, improves work-ing life.
Innovative point of the present invention is: 1) develop without the need to add expensive alloys and corrosive nature excellent have superstrength rank high-plasticity can the moist environment condition such as building, bridge under construction(al)steel; 2) adopt low temperature open rolling+high-temperature final rolling+ultrafast refrigeration technique, suppress the generation of ferrite, perlite, bainite, obtain single martensitic stucture, reduce the erosion rate of matrix.
Accompanying drawing explanation
The 5Cr steel 500X microstructure picture that Fig. 1 provides for the embodiment of the present invention.
The macrograph of the 5Cr steel transmission thin slice that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below by embodiment, the present invention will be further described:
Embodiment 1:
Chemical composition and the mass percent of the corrosion-resistant steel of 5Cr are:
Composition 1:C:0.063%, Si:0.22%, Mn:0.63%, P:0.010%, S:0.005%, Cr:5.09%, N:0.0420%, surplus is Fe and inevitable impurity;
Composition 2:C:0.058%, Si:0.18%, Mn:0.69%, P:0.010%, S:0.005%, Cr:4.83%, N:0.0320%, surplus is Fe and inevitable impurity.
The production technique of this corrosion-resistant steel is:
Molten iron → converter smelting → interpolation ferrochrome → refining → continuous casting becomes small billet → process furnace heating → controlled rolling → controlled cooling model.
Process for making and control are: converter terminal adds ferrochrome, and continuous casting adopts full guard cast.
Steel rolling process and control are:
Steel rolling process adopts following two kinds of technology controlling and process
Technique 1: Heating temperature is 1185 DEG C, start rolling temperature 1035 DEG C, final rolling temperature 935 DEG C control, roll and wear water to 350 DEG C by force, temperature on cooling table 380 DEG C afterwards;
Technique 2: Heating temperature is 1215 DEG C, start rolling temperature 1005 DEG C, final rolling temperature 905 DEG C control, roll and wear water to 370 DEG C by force, temperature on cooling table 420 DEG C afterwards;
This steel is by after above-mentioned explained hereafter, and detected result is as follows:
Metallographic test set is woven to the residual austenite of martensite+a small amount of;
Mechanics detection yield strength reaches 600Mpa level level, tensile strength reaches 900Mpa level, unit elongation >=10%, and mechanical property is shown in Table 1;
Control and Inclusion Removal rank≤1.5 grade;
Corrosion resisting property is corroded 72 hours in 2%NaCl neutral solution by period soaking corrosion trier, and experimental temperature is 45 DEG C, humidity is 70%, and result shows 2.3 times that its corrosive nature is carbon steel, is shown in Table 2.
Mechanical property in table 1 embodiment 1
Table 2 embodiment 1 period soaking corrosion experimental result
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. a production method for the corrosion-resistant steel of 5Cr, the production technique of this corrosion-resistant steel comprises molten iron → converter smelting → interpolation ferrochrome → refining → continuous casting and becomes small billet → process furnace heating → controlled rolling → controlled cooling model; It is characterized in that, the technical parameter controlled in process is:
Process for making and control are: converter terminal adds ferrochrome, and continuous casting adopts full guard cast, Control and Inclusion Removal rank≤1.5 grade;
Steel rolling process and control are: Heating temperature is 1185-1215 DEG C, start rolling temperature 1005-1035 DEG C, and final rolling temperature adopts 905-935 DEG C, and roll the rear water to 350 DEG C ± 20 DEG C worn by force, temperature on cooling table 380-420 DEG C, to prevent the existence of heterogeneous structure;
Chemical composition and the mass percent of the corrosion-resistant steel of described 5Cr are: C:0.05%-0.07%, Si:0.1%-0.3%, Mn:0.5%-0.8%, P :≤0.02%, S :≤0.01%, Cr:4.5%-5.5%, N:0.02%-0.05%, and surplus is Fe and inevitable impurity;
The microstructure of steel is thin lath martensite+a small amount of residual austenite.
2. method according to claim 1, is characterized in that: the ferrochrome of interpolation is low-carbon alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410247308.6A CN103993229B (en) | 2014-06-05 | 2014-06-05 | A kind of corrosion-resistant steel of 5Cr and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410247308.6A CN103993229B (en) | 2014-06-05 | 2014-06-05 | A kind of corrosion-resistant steel of 5Cr and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103993229A CN103993229A (en) | 2014-08-20 |
| CN103993229B true CN103993229B (en) | 2016-03-02 |
Family
ID=51307553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410247308.6A Active CN103993229B (en) | 2014-06-05 | 2014-06-05 | A kind of corrosion-resistant steel of 5Cr and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103993229B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917050B (en) * | 2017-03-29 | 2018-10-09 | 海城市欣锐铸件有限公司 | A kind of continuous cast method of anti-corrosion spiral |
| CN107254628B (en) * | 2017-05-24 | 2019-03-29 | 首钢集团有限公司 | A kind of resistance to SO2 and the construction(al)steel and production method of the corrosion of low chlorine ion concentration |
| CN115074637B (en) * | 2022-06-25 | 2023-04-28 | 上海交通大学 | Ultra-high-strength high-toughness ultra-fine tissue low-carbon low-alloy steel and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09176783A (en) * | 1995-12-25 | 1997-07-08 | Nkk Corp | High tensile strength steel excellent in weldability and atmospheric corrosion resistance and its production |
| CN103225044B (en) * | 2013-04-24 | 2015-06-17 | 马钢(集团)控股有限公司 | Steel for vanadium micro alloying low temperature steel bar and process for rolling steel |
| CN103540871B (en) * | 2013-11-07 | 2017-04-12 | 首钢总公司 | Low-carbon high-chromium high-nitrogen high-corrosion resistance steel and production method thereof |
-
2014
- 2014-06-05 CN CN201410247308.6A patent/CN103993229B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103993229A (en) | 2014-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104018091B (en) | A kind of reinforcing bar and preparation method thereof | |
| CN101497966B (en) | High-hardness hypereutectic high chromium, manganese, molybdenum and tungsten alloy wear resistant steel material and use thereof | |
| CN109082594B (en) | Acid soil corrosion resistant steel for buried structure and manufacturing method thereof | |
| CN101935809A (en) | High performance rare-earth duplex stainless steel alloy material and preparation method thereof | |
| CN103397272B (en) | There is wear-resisting steel plate of low crack-sensitivity exponential sum high strength and preparation method thereof | |
| CN100540709C (en) | A kind of vanadium high-strength corrosion-resistant steel bar steel and production technique thereof of containing | |
| CN104711493A (en) | Nickel-saving rare-earth/barium-containing biphase stainless steel alloy material and preparation method thereof | |
| CN104928602A (en) | Pipeline steel, wide and thick plate, resistant to H2S corrosion, and production method thereof | |
| CN106893945B (en) | Austenitic stainless steel for low temperature, casting thereof and manufacturing method of casting | |
| CN104451409A (en) | Low-cost HB400-grade wear-resisting steel and production method thereof | |
| CA2785318A1 (en) | Austenite steel material having superior ductility | |
| CN107460412B (en) | High-strength and high-toughness corrosion-resistant steel and rolling method thereof | |
| CN104152818A (en) | Duplex stainless steel and preparation method thereof | |
| CN105239014A (en) | Low-cost high-carbon medium-magnesium abrasion resisting steel and manufacturing method of hot rolled plate of low-cost high-carbon medium-magnesium abrasion resisting steel | |
| CN108588581B (en) | A kind of marine concrete structure high strength anti-corrosion ferrite/bainite two-phase reinforcing bar and preparation method thereof | |
| CN107723603A (en) | Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method | |
| CN106801188A (en) | 400Mpa grades of construction(al)steel and production method with excellent corrosive nature | |
| CN103993229B (en) | A kind of corrosion-resistant steel of 5Cr and production method thereof | |
| CN100554478C (en) | A kind of steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technology thereof | |
| CN104018081B (en) | A kind of low temperature resistant special reinforced and production method | |
| CN104878316A (en) | High-strength high-toughness high-nitrogen austenitic stainless steel | |
| CN104419871A (en) | Steel for welding structure with excellent marine environment corrosion resistance and manufacturing method of steel | |
| CN104372246A (en) | 400 MPa-level tungstenic corrosion-resistant twisted steel and preparation method thereof | |
| CN104946996A (en) | Alkali corrosion resistance high strength steel and production method thereof | |
| CN110964982B (en) | High-chromium corrosion-resistant steel and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |