CN103924159A - Corrosion-resistant steel for blast-furnace gas pipelines and manufacturing method thereof - Google Patents
Corrosion-resistant steel for blast-furnace gas pipelines and manufacturing method thereof Download PDFInfo
- Publication number
- CN103924159A CN103924159A CN201410176068.5A CN201410176068A CN103924159A CN 103924159 A CN103924159 A CN 103924159A CN 201410176068 A CN201410176068 A CN 201410176068A CN 103924159 A CN103924159 A CN 103924159A
- Authority
- CN
- China
- Prior art keywords
- corrosion
- steel
- furnace gas
- resistant steel
- blast furnace
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of corrosion-resistant steel for blast-furnace gas pipelines and a manufacturing method thereof. The corrosion-resistant steel comprises the following chemical compositions in percentage by weight: 0.07-0.12% of C, 0.1-0.3% of Si, 0.4-0.6% of Mn, 0.5-0.7% of Cr, 0.1-0.3% of Ni, 0.25-0.45% of Cu, 0.008-0.025% of Al, less than or equal to 0.025% of P, less than or equal to 0.015% of S, and the balance of Fe. According to the invention, by optimizing the composition design of the steel, a synergistic effect is achieved among elements, so that on the premise of guaranteeing the toughness and welding performance of the steel, the strength of the steel is improved, and the corrosion resistance of the steel is increased.
Description
Technical field
The present invention relates to low alloy steel and manufacture field, be specifically related to a kind of blast furnace gas pipeline corrosion-resistant steel and manufacture method thereof.
Background technology
Corrosion is a kind of common phenomenon of blast furnace gas pipeline, and in recent years, blast furnace coal gas purification system put into operation after dry method dust, TRT generating, and rear portion piped gas water of condensation presents strongly-acid, and heavy corrosion all appears in piping facility, has huge potential safety hazard.Blast furnace gas pipeline corrosion is mainly acid dew point corrosion, and analysis of blast furnace gas ingredient comprises N
2, CO, CO
2, SO
2and grit (comprises Cl-, CO
3 2-, SO
3 2-, Fe
3+deng), wherein CO in gas
2, SO
2be sour gas, CaCl in grit
2, FeCl
3deng being strong acid weak base salt.These sour gas and acid-salt are dissolved in gas condensed water after blast furnace gas cooling, and this acidic solution is followed gas to flow to rear portion piping facility and caused corrosion.At present, numerous steel mills have all taked different measure preventions, have controlled corrosion.More typical control device has following several:
(1) acid-base neutralisation method,, at pipeline spray NaOH solution control gas condensed water acid attack, its advantage is that the acid control of coal gas is better, shortcoming is occupied ground, alkali lye preparation and delivery system seriously corroded, maintenance workload is large.
(2) inner-walls of duct coated anti-corrosion layer, at pipe inner-wall spraying preservative coat, its advantage is that installations and facilities do not have special place, save space, everyday devices maintenance workload is little, shortcoming is that this anti-corrosion measure belongs to passive-type, can not solve gas corrosion at all, and spraying area does not also exist the corrosion of coal gas acidity.
(3) crude fuel control, reduce into stove crude fuel S, Cl content, acidic components from source elimination or minimizing blast furnace gas, its advantage is not exist equipment, facility to drop into, but the control of crude fuel very easily causes the cost of crude fuel to raise, also likely affect conditions of blast furnace, be unfavorable for production steady running.
Above several method equipment cost or maintenance cost are higher, all can not fundamentally solve and control the etching problem of blast furnace gas pipeline, generally can not meet at present the corrosion-resistant requirement of blast furnace gas pipeline for the ferrous materials of gas line manufacture, this just requires to adapt to the novel corrosion resistant steel of blast furnace gas environment.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is the corrosion of existing blast furnace gas pipeline and the problem of easy care not.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of blast furnace gas pipeline corrosion-resistant steel and manufacture method thereof, to meet the demand of blast furnace gas pipeline steel.
Blast furnace gas pipeline corrosion-resistant steel involved in the present invention, its chemical component weight per-cent is: C:0.07-0.12%, Si:0.1-0.3%, Mn:0.4-0.6%, Cr:0.5-0.7%, Ni:0.1-0.3%, Cu:0.25-0.45, Al:0.008-0.025%, P≤0.025%, S≤0.015%, all the other are Fe and impurity.
The manufacture method of corrosion-resistant steel for blast furnace gas pipeline involved in the present invention, comprise converter smelting, secondary refining, continuous casting, heating, rolling and cooling, through converter smelting and secondary refining, continuous casting becomes slab, and above-mentioned heating of plate blank is to 1150-1250 DEG C, adopt two-stage controlled rolling, accumulative total draught is not less than 65%, and finishing temperature is controlled at 840-880 DEG C, then passes through the cooling curling rolling of laminar flow, speed of cooling 5-12 DEG C/S, final cooling temperature is controlled at 620-660 DEG C.
(3) beneficial effect
Corrosion-resistant steel and manufacture method thereof for blast furnace gas pipeline of the present invention, by optimizing the Composition Design of steel, make to produce synergy between each element, ensureing, under the toughness of steel and the prerequisite of welding property, to improve the intensity of steel, improves the corrosion resistance nature of steel.The present invention has no special requirements to manufacturing process, adopt the manufacturing process of conventional steel, can adopt rolling flexibly and process for cooling in conjunction with mechanical property requirements, reduce manufacture difficulty and cost, make corrosion-resistant steel reach excellent stretching and yield behavior simultaneously.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is done into a detailed description.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
The invention provides a kind of blast furnace gas pipeline corrosion-resistant steel, its chemical component weight per-cent is: C:0.07-0.12%, Si:0.1-03%, Mn:0.4-0.6%, Cr:0.5-0.7%, Ni:0.1-0.3%, Cu:0.25-0.45, Al:0.008-0.025%, P≤0.025%, S≤0.015%, all the other are Fe and impurity.
The manufacture method of corrosion-resistant steel for above-mentioned blast furnace gas pipeline, comprise converter smelting, secondary refining, continuous casting, heating, rolling and cooling, it is characterized in that: through converter smelting and secondary refining, continuous casting becomes slab, above-mentioned heating of plate blank is to 1150-1250 DEG C, adopt two-stage controlled rolling, accumulative total draught is not less than 65%, and finishing temperature is controlled at 840-880 DEG C, then passes through the cooling curling rolling of laminar flow, speed of cooling 5-12 DEG C/S, final cooling temperature is controlled at 620-660 DEG C.
Blast furnace gas pipeline of the present invention is strengthening element most economical, the most basic in steel with each alloying constituent mechanism of action: C in corrosion-resistant steel steel, but when exceeding steel welding property when a certain amount of, C content worsens, consider from product economy and welding property angle, C content is controlled at 0.07-0.12%.
Si is the necessary element of deoxidation in steelmaking process, also can improve the intensity of steel, if but a large amount of silicon can reduce toughness and the erosion resistance of mother metal and weld, so its content is controlled to 0.1-0.3%.
Mn ensures the intensity of steel and the bioelement of toughness, Mn can be combined with S and be formed MnS, avoid grain boundaries to form the thermal crack that FeS causes, Mn is also good reductor simultaneously, Mn content is lower than 0.20%, be difficult to ensure above-mentioned effect, if Mn element too Gao Zehui increase the weight of strand segregation and worsen welding property, therefore Mn content should be controlled at 0.4-0.6%.
Cr can improve intensity, the hardness of steel, but reduce moulding and toughness simultaneously, Cr is along with oxidation is carried out forming fine and close Cr2O3 layer on steel surface, the negatively charged ion that can suppress under acid attack environment is invaded, thereby reduce the enrichment of the negatively charged ion such as Cl-on steel surface, significantly improve its erosion resistance and oxidation-resistance.From the viewpoint of cost, performance and anticorrosion effect, the content range that adds Cr is 0.5-0.7%.
Ni can improve the intensity of steel and significantly not reduce its toughness, improve the low-temperature flexibility of material, reduce Cold Brittleness Transition Temperature, can also improve the red brittleness that Cu causes in steel, improve processibility and the weldability of steel, can also improve the resistance to corrosion of steel simultaneously, Ni add-on is too low, DeGrain, the too high cost that significantly increases of add-on, therefore, in steel of the present invention, Ni content is 0.1-0.3%.
Cu can be in corrosive medium, under surface oxide layer, form enriched layer with the element such as Cr, Ni, As time goes on, top layer becomes permanent anti-rust film, so Cu can significantly improve the erosion resistance of steel in hydrochloric acid and sulfuric acid, further improve the pitting corrosion resistance of steel.
Deoxidation, fixed nitrogen and crystal grain thinning element that Al must add as the present invention, add content more than 0.008%, but easily produce strand thermal crack when too high levels, and form and be mingled with in a large number, the toughness drop of steel simultaneously, therefore Al content range is 0.008-0.025%.
The impurity element such as P and S for improving toughness and solidity to corrosion, reduce its content as far as possible.
Above-mentioned blast furnace gas pipeline is described as follows by the manufacture method technical scheme of corrosion-resistant steel:
(1) content of 5 principal element C, Si, Mn, P, S of adjusting steel by converter, to the scope of the invention, and adds as requested respective alloy and carries out deoxidation alloying.
(2) converter tapping molten steel carries out secondary refining by refining furnace, and the omnidistance BOTTOM ARGON BLOWING of process, further reduces the detrimental impurity content such as O, S, nonmetal inclusion.
(3) above-mentioned steel is made to slab by continuous casting process, entering process furnace heating slab afterwards.
(4) above-mentioned plate slab is heated to and is not less than 1150 DEG C but not higher than the temperature of 1250 DEG C, being not enough to allow alloying element be dissolved into completely in austenite lower than the temperature of 1100 DEG C, can not ensure the finishing temperature that hot rolling is required, on the other hand, can be AUSTENITE GRAIN COARSENING in the temperature higher than 1250 DEG C, will reduce the toughness of steel.Adopt the heating cycle of high temperature rapid firing simultaneously, accelerate heat-up rate, shorten soaking time, reduce surface oxidation, prevent the enrichment of copper at crystal boundary and billet surface.
(5) consider from the mechanical property requirements that meets blast furnace gas pipeline corrosion-resistant steel, select suitable technique hot rolling, adopt 1150-980 DEG C of austenite recrystallization district and 920-820 DEG C of non-recrystallization district two stage rolling, and ensureing that two stage rolling accumulative total draught are not less than 65%, finishing temperature is controlled at 840-880 DEG C.
(6) after hot rolling according to thickness specification and mechanical property requirements difference, speed of cooling is controlled at 5-12 DEG C/s, final cooling temperature is controlled at 620-660 DEG C
The present invention is further described below:
Molten iron and steel scrap are smelted in converter, after tapping, add alloy adjusting component, then molten steel send ladle secondary refining, adjust chemical composition each composition of steel as shown in table 1 embodiment 1-5, molten steel manufactures 180 × 1010mm section slab through continuous casting, by these heating of plate blanks to 1200 DEG C, carry out roughing and finish rolling, finishing temperature 840-880 DEG C, cooling through laminar flow after rolling, final cooling temperature is 620-660 DEG C, makes thickness and be respectively the steel plate of 6mm, 8mm, 10mm, shown in corresponding table 2 embodiment of its mechanical property 1-5.
Table 1 steel chemical composition
Table 2 steel mechanical property
| Embodiment | Specification (mm) | Yield strength (Mpa) | Tensile strength (Mpa) | Elongation (%) | Clod wash (d=2a) |
| 1 | 8.0*1010 | 355 | 475 | 28 | Qualified |
| 2 | 6.0*1010 | 350 | 480 | 30 | Qualified |
| 3 | 10.0*1010 | 345 | 455 | 31 | Qualified |
| 4 | 8.0*1010 | 350 | 460 | 28 | Qualified |
| 5 | 8.0*1010 | 380 | 460 | 32 | Qualified |
Metallic substance laboratory uniform corrosion is invaded test entirely:
From the embodiment 1-5 steel plate obtaining through aforesaid method, cut the rectangle sample of wide 25mm, long 50mm, thick 7mm, cut onesize sample from same size Q345B steel plate simultaneously, according to JB/T7901-2001 standard, under room temperature (25 DEG C) 30% sulphuric acid soln condition, the corrosion resistance nature of corrosion-resistant steel and Q345B in contrast the present invention.The process of the test cycle is as follows: the weight (M) of every sample of corrosion test pre-test and surface-area (S), test is carried out 24h, 48h and measured respectively every sample weight (M1).Erosion rate is calculated formula:
In formula, R is erosion rate, mm/a; M is the sample mass before test, g; M1 is the sample mass after test, g; S is the total area of sample, cm2; T is test period, h; D is the density of material, and Kg/m3 entirely invades test-results and lists in table 3.
Table 3 is invaded test-results (room temperature (25 DEG C) 30% sulphuric acid soln) entirely
| Material | 24h erosion rate (mm/a) | 48h erosion rate (mm/a) |
| Q345B | 289.61 | 264.50 |
| Steel of the present invention | 61.86 | 39.17 |
Can be found out by above-mentioned test, under room temperature (25 DEG C) 30% sulphuric acid soln condition, 24h pickle test Q345B erosion rate is 4.7 times of corrosion-resistant steel in the present invention, and 48h pickle test Q345B erosion rate is 6.8 times of corrosion-resistant steel in the present invention.In the present invention, corrosion-resistant steel 48h pickle test corrosion rate significantly reduces than 24h pickle test corrosion rate, in the present invention of this proof, corrosion-resistant steel surface formation one deck in pickle test corrosion process is rich in the film of the alloying elements such as Cr, Ni, Cu, stop further corrosion, there is excellent corrosion resistance nature.
Adopt blast furnace gas pipeline corrosion-resistant steel of the present invention, there is following effect:
(1) the present invention, by optimizing the Composition Design of steel, makes to produce synergy between each element, ensureing, under the toughness of steel and the prerequisite of welding property, to improve the intensity of steel, improves the corrosion resistance nature of steel.
(2) the present invention has no special requirements to manufacturing process, adopts the manufacturing process of conventional steel, can adopt rolling flexibly and process for cooling in conjunction with mechanical property requirements, has reduced manufacture difficulty and cost.
(3) blast furnace gas of the present invention also can reach following performance index with corrosion-resistant steel: tensile property: yield strength >=320Mpa, tensile strength >=440Mpa, elongation >=25%.
In sum, adopt blast furnace gas pipeline corrosion-resistant steel of the present invention, for manufacture blast furnace gas pipeline etc. provides the high performance steel with excellent anticorrosive performance.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (5)
1. a blast furnace gas pipeline corrosion-resistant steel, it is characterized in that, its chemical component weight per-cent is: C:0.07-0.12%, Si:0.1-0.3%, Mn:0.4-0.6%, Cr:0.5-0.7%, Ni:0.1-0.3%, Cu:0.25-0.45, Al:0.008-0.025%, P≤0.025%, S≤0.015%, all the other are Fe and impurity.
2. blast furnace gas pipeline corrosion-resistant steel as claimed in claim 1, it is characterized in that, its chemical component weight per-cent is: C:0.09%, Si:0.215%, Mn:0.509%, Cr:0.566%, Ni:0.186%, Cu:0.277%, Al:0.023%, P≤0.020%, S:0.007%.
3. blast furnace gas pipeline corrosion-resistant steel as claimed in claim 1, is characterized in that, C:0.084%, Si:0.204%, Mn:0.501%, Cr:0.605%, Ni:0.162%, Cu:0.285%, Al:0.022%, P:0.014%, S:0.011%.
4. blast furnace gas pipeline corrosion-resistant steel as claimed in claim 1, is characterized in that, C:0.070%, Si:0.162%, Mn:0.467%, Cr:0.526%, Ni:0.163%, Cu:0.272%, Al:0.021%, P:0.017%, S:0.007%.
5. the manufacture method of a blast furnace gas pipeline use corrosion-resistant steel, it is characterized in that, comprise converter smelting, secondary refining, continuous casting, heating, rolling and cooling, it is characterized in that: through converter smelting and secondary refining, continuous casting becomes slab, above-mentioned heating of plate blank is to 1150-1250 DEG C, adopt two-stage controlled rolling, accumulative total draught is not less than 65%, finishing temperature is controlled at 840-880 DEG C, pass through the cooling curling rolling of laminar flow, speed of cooling 5-12 DEG C/S, final cooling temperature is controlled at 620-660 DEG C again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176068.5A CN103924159A (en) | 2014-04-22 | 2014-04-22 | Corrosion-resistant steel for blast-furnace gas pipelines and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176068.5A CN103924159A (en) | 2014-04-22 | 2014-04-22 | Corrosion-resistant steel for blast-furnace gas pipelines and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103924159A true CN103924159A (en) | 2014-07-16 |
Family
ID=51142547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410176068.5A Pending CN103924159A (en) | 2014-04-22 | 2014-04-22 | Corrosion-resistant steel for blast-furnace gas pipelines and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103924159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116179965A (en) * | 2022-11-25 | 2023-05-30 | 重庆钢铁股份有限公司 | Economical weather-resistant structural steel plate Q355NHD and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135029A (en) * | 2006-08-31 | 2008-03-05 | 宝山钢铁股份有限公司 | Yield strength 700MPa grade atmospheric corrosion resistant steel and method for manufacturing same |
| CN101831598A (en) * | 2010-05-26 | 2010-09-15 | 马鞍山钢铁股份有限公司 | Low alloy steel for resisting sulfuric acid dew point corrosion and production method thereof |
-
2014
- 2014-04-22 CN CN201410176068.5A patent/CN103924159A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135029A (en) * | 2006-08-31 | 2008-03-05 | 宝山钢铁股份有限公司 | Yield strength 700MPa grade atmospheric corrosion resistant steel and method for manufacturing same |
| CN101831598A (en) * | 2010-05-26 | 2010-09-15 | 马鞍山钢铁股份有限公司 | Low alloy steel for resisting sulfuric acid dew point corrosion and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116179965A (en) * | 2022-11-25 | 2023-05-30 | 重庆钢铁股份有限公司 | Economical weather-resistant structural steel plate Q355NHD and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109023112B (en) | High-strength atmospheric corrosion resistant cold forging steel and preparation method thereof | |
| CN104357754B (en) | A kind of corrosionproof steel against sulfuric acid at dew point plate and manufacture method thereof | |
| CN109957707B (en) | Weather-resistant cold-heading steel wire rod for 1000 MPa-level fastener and production method thereof | |
| WO2018001043A1 (en) | Improved 09crcusb steel resistant to sulfuric acid dew point corrosion and preparation method therefor | |
| AU2018217232A1 (en) | Heavy-gauge ti-containing weathering steel and manufacturing method thereof | |
| CN105154784B (en) | A kind of high phosphorus weather-proof structural steel plate and preparation method thereof | |
| CN109797341A (en) | A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof | |
| CN109161793B (en) | Low-yield-ratio high-strength weathering steel and production method thereof | |
| CN105039866A (en) | 1400 MPa super-high strength alloy steel and manufacturing method thereof | |
| CN103361569A (en) | Ultralow temperature weather-proof structural steel plate and production method thereof | |
| JP7233483B2 (en) | 630 MPa grade high corrosion resistant weathering steel and method for producing the same | |
| CN109609845A (en) | A kind of 500MPa grades of weathering steel and its production method | |
| CN104762559A (en) | Method for producing steel plate for hydrogen-contacting equipment | |
| CN103060714A (en) | Corrosion-resistant low alloy steel plate for marine splash zones and production method thereof | |
| CN111676427A (en) | 590MPa grade high-corrosion-resistance weathering steel and preparation method thereof | |
| CN111850429A (en) | Steel for high-strength weather-resistant fastener and manufacturing method thereof | |
| CN103882307A (en) | Corrosion-resistant steel for cargo oil tank base plate of crude oil carrier | |
| CN103952627A (en) | High-elongation and low-yield-ratio ferrite weathering-resistant steel and production method thereof | |
| CN114892090A (en) | Production method of Q550-grade high-corrosion-resistance high-strength offshore structure steel | |
| CN101665892B (en) | Silicon alloy steel and manufacturing method thereof | |
| CN102286700B (en) | Sulfuric-acid-resistant dew point corrosion steel with tensile strength greater than or equal to 800Mpa grade and preparation method thereof | |
| CN113564481A (en) | Low-cost sulfate acid dew point corrosion resistant steel plate and manufacturing method thereof | |
| CN107739992A (en) | Normalizing type surrenders 345MPa levels weather-resistant steel plate and its production method | |
| CN101691642A (en) | Sulfuric acid dew point corrosion-resistant steel and production process thereof | |
| CN108251750A (en) | A kind of nickel-saving type think gauge containing Cu two phase stainless steel and preparation method 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 | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140716 |