CN105274446B - High chromium weathering steel and preparation method thereof - Google Patents
High chromium weathering steel and preparation method thereof Download PDFInfo
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- CN105274446B CN105274446B CN201510802484.6A CN201510802484A CN105274446B CN 105274446 B CN105274446 B CN 105274446B CN 201510802484 A CN201510802484 A CN 201510802484A CN 105274446 B CN105274446 B CN 105274446B
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Abstract
The invention belongs to field of iron and steel smelting, and in particular to a kind of high chromium weathering steel and its milling method.A kind of high chromium weathering steel of the present invention, is made up of following percentage by weight chemical composition：C≤0.07%, Si≤0.50%, Mn≤1.5%, P≤0.02%, S≤0.010%, Cu 0.20~0.55%, Cr 4.50~5.50%, Ni 0.10~0.65%, Ti0.01%~0.03%, remaining is Fe and inevitable impurity.Weathering steel of the present invention and preparation method thereof, it is low with production cost, technique is simple, product qualification rate is high, the features such as weathering steel excellent combination property, high-weatherability requirement of the existing industry to weathering steel can not only be met, moreover it is possible to meet the stable mechanical property requirements of steel, especially with superior low temperature impact properties.
Description
Technical field
The invention belongs to field of iron and steel smelting, and in particular to a kind of high chromium weathering steel and preparation method thereof.
Background technology
Weathering steel, also known as weather resisting steel, the corrosion under the conditions of natural atmosphere can be resisted, not be between ordinary steel and not
Low-alloy steel series between rust steel, weathering steel add the corrosion-resistant element such as a small amount of copper, nickel by straight carbon steel and formed, and have high-quality steel
Tough, modeling prolong, be molded, welding, abrasion, high temperature, the characteristic such as antifatigue；Weatherability is 2~8 times of straight carbon steel, and coating is
1.5~10 times of straight carbon steel.Meanwhile it have it is antirust, make component it is anticorrosive lengthen the life, be thinned consumption reduction, saving of labor save the features such as.It is resistance to
Time steel is mainly used in railway, vehicle, bridge, pylon etc. and is chronically exposed to the steel construction used in air.For manufacture container,
The knot such as container of sulfide hydrogen corrosive medium in rail truck, oil derrick, harbour building, production platform and chemical petroleum equipment
Component.
Weathering steel is protected mostly using elements such as addition molybdenum, niobium, titanium, zirconium and vanadium so as to be formed on its surface in the prior art
Sheath, to improve the weather resistance of steel, these elements are mostly expensive, and preparation cost is of a relatively high, though in addition, rare earth element
So there is extremely strong deoxidizing capacity, and can crystal grain thinning, change the form of field trash, but the fusing point of its oxide is higher, than
It is great, easily cause clogging of tundish nozzle in continuous casting.
Application No. " 201210130225.X ", entitled " a kind of weathering steel ", discloses a kind of following weight hundred
The material of ratio is divided to form：Manganese 0.36~0.50%；Chromium 0.45~0.60%；Nickel 0.11~0.13%；Copper 0.25~0.32%；Nitrogen
≤ 0.005%；Phosphorus 0.070~0.105%；Surplus is the weathering steel of iron and inevitable impurity.Wherein, the patent weathering steel
Middle chromium content is relatively low, and phosphorus content is higher, easily causes the fragility of steel, and the steel prepared can not meet existing industry to weather-proof
The new demands such as steel high corrosion-resistant, obdurability.
For high-strength and high-weather-resistance steel compared with common weathering steel, corrosion resisting property improves about one times, improves rail truck
Service life, simultaneously because alloy content is high, yield tensile ratio is higher.In order to ensure railway, ship, bridge, building, container etc. in height
The operational reliability in cold area, each state all propose low-temperature impact to special carbon steel and absorb work(requirement.
Lot of experiments Research And Engineering practice have shown that, brittle phenomenon can occur in low temperature for Hi-Stren steel, brittle
When material be transitioned into brittle state by ductile states, impact value substantially reduces, and fracture is changed into crystalloid from threadiness.Metal material
The characteristic to become fragile at such low temperatures is referred to as black brittleness, and metal material resists the ability of brittle break at low temperature
Referred to as low-temperature flexibility.
The content of the invention
For overcome the deficiencies in the prior art, it is good that first technical problem to be solved by this invention is to provide a kind of plasticity
It is good, the good high chromium weathering steel of degree of purity.
The high chromium weathering steel of the present invention, is made up of following percentage by weight chemical composition：C≤0.07%, Si≤0.50%, Mn
≤ 1.5%, P≤0.02%, S≤0.010%, Cu 0.20~0.55%, Cr 4.50~5.50%, Ni 0.10~0.65%,
Ti0.01%~0.03%, remaining is Fe and inevitable impurity.
Further, as preferred technical scheme, high chromium weathering steel described above, by following percentage by weight chemistry
Composition forms：C 0.01~0.07%, Si 0.02~0.5%, Mn 0.15~1.5%, P≤0.02%, S≤0.010%, Cu
0.20~0.55%, Cr 4.50~5.50%, Ni 0.10~0.65%, Ti0.01%~0.03%, remaining is Fe and can not
The impurity avoided.
Further, as preferred technical scheme, high chromium weathering steel described above, by following percentage by weight chemistry
Composition forms：C 0.01~0.03%, Si0.02~0.10%, Mn 0.15~0.30%, P ＜ 0.010%, S ＜ 0.005%,
Cu 0.20~0.39%, Cr 4.50~5.50%, Ni 0.10~0.21%, Ti 0.01~0.03%, remaining is for Fe and not
Evitable impurity.
Further, as preferred technical scheme, high chromium weathering steel described above, by following percentage by weight chemistry
Composition forms：C 0.02%, Si 0.05%, Mn 0.22%, P 0.008%, S 0.002%, Cu 0.30%, Cr
4.95%, Ni 0.15%, Ti 0.02%, remaining is Fe and inevitable impurity.
High chromium weathering steel described above, 450~510MPa of yield strength, 550~630MPa of tensile strength, elongation percentage >=
25%, low-temperature impact work >=300J at -40 DEG C, relatively corrosive rate≤25%.
Second technical problem to be solved by this invention is to provide that a kind of method is simple, and cost is low, and low-temperature impact work >=
The preparation method of 300J high chromium weathering steel.
The preparation method of high chromium weathering steel described above, this method mainly include the following steps that：Steel billet → hot rolling → laminar flow
Cool down → batch；
Wherein, finish rolling start rolling temperature is 900~950 DEG C in hot-rolled step, and finishing temperature is 800~829 in hot-rolled step
℃；Laminar flow cooling upper header water ratio is 75~85% in cooling step, and lower collector pipe water ratio is 90~100%；Batch
Temperature in step is 520~557 DEG C.
Further, as preferred technical scheme, the preparation method of high chromium weathering steel described above, in hot-rolled step
The start rolling temperature of finish rolling is 921 DEG C, and finishing temperature is 814 DEG C in hot-rolled step；Upper header water ratio 85% in cooling step,
Lower collector pipe water ratio is 100%；Coiling temperature is 545 DEG C.
The high chromium weathering steel of the preparation method of the high chromium weathering steel of the present invention and its ballistic work function admirable of preparation, has life
Produce that cost is low, and technique is simple, product qualification rate is high, the features such as weathering steel excellent combination property, can not only meet that existing industry is right
The high-weatherability requirement of weathering steel, moreover it is possible to meet the mechanical property requirements of steel high intensity, especially have in extremely frigid zones steel
There is the advantages of low-temperature flexibility is high, pass through controlled rolling and cooling technique (zerolling and larger cooling flow, crystal grain thinning and control
Microscopic structure processed is formed), there is the advantages that HI high impact work(performance, rolling accepted product percentage are high, product high comprehensive performance.
Embodiment
The high chromium weathering steel of the present invention, is made up of following percentage by weight chemical composition：C≤0.07%, Si≤0.50%, Mn
≤ 1.5%, P≤0.02%, S≤0.010%, Cu 0.20~0.55%, Cr 4.50~5.50%, Ni 0.10~0.65%,
Ti0.01%~0.03%, remaining is Fe and inevitable impurity.
Further, as preferred technical scheme, high chromium weathering steel described above, by following percentage by weight chemistry
Composition forms：C 0.01~0.07%, Si 0.02~0.5%, Mn 0.15~1.5%, P≤0.02%, S≤0.010%, Cu
0.20~0.55%, Cr 4.50~5.50%, Ni 0.10~0.65%, Ti0.01%~0.03%, remaining is Fe and can not
The impurity avoided.
Further, as preferred technical scheme, high chromium weathering steel described above, by following percentage by weight chemistry
Composition forms：C 0.01~0.03%, Si0.02~0.10%, Mn 0.15~0.30%, P ＜ 0.010%, S ＜ 0.005%,
Cu 0.20~0.39%, Cr 4.50~5.50%, Ni 0.10~0.21%, Ti 0.01~0.03%, remaining is for Fe and not
Evitable impurity.
Further, as preferred technical scheme, high chromium weathering steel described above, by following percentage by weight chemistry
Composition forms：C 0.02%, Si 0.05%, Mn 0.22%, P 0.008%, S 0.002%, Cu 0.30%, Cr
4.95%, Ni 0.15%, Ti 0.02%, remaining is Fe and inevitable impurity.
High chromium weathering steel described above, 450~510MPa of yield strength, 550~630MPa of tensile strength, elongation percentage >=
25%, low-temperature impact work >=300J at -40 DEG C, relatively corrosive rate≤25%.
The preparation method of high chromium weathering steel described above, this method mainly include the following steps that：Steel billet → hot rolling → laminar flow
Cool down → batch；
Wherein, finish rolling start rolling temperature is 900~950 DEG C in hot-rolled step, and finishing temperature is 800~829 in hot-rolled step
℃；Laminar flow cooling upper header water ratio is 75~85% in cooling step, and lower collector pipe water ratio is 90~100%；Batch
Temperature in step is 520~557 DEG C.
Further, as preferred technical scheme, the preparation method of high chromium weathering steel described above, in hot-rolled step
The start rolling temperature of finish rolling is 921 DEG C, and finishing temperature is 814 DEG C in hot-rolled step；Upper header water ratio 85% in cooling step,
Lower collector pipe water ratio is 100%；Coiling temperature is 545 DEG C.
Wherein, finish rolling start rolling temperature is 900~950 DEG C in the hot-rolled step, and temperature is too low, and rolling rhythm is too slow, raw
It is low to produce efficiency.Temperature is too high, and operation of rolling cooling velocity is too fast, uneven microstructure, causes finished product low temperature impact properties poor.
Finishing temperature is 810~829 DEG C in the hot-rolled step, and temperature is too low, in ferrite rolling, product combination property
Difference.Temperature is too high, and cooling velocity is too fast, uneven microstructure, and low temperature impact properties are poor.
In the cooling step laminar flow cooling upper header water ratio be 75~85%, lower collector pipe water ratio be 90~
100%, water is too small or too big, can not all meet coiling temperature requirement, and low temperature impact properties are poor.
The temperature batched in step is 520~557 DEG C, and temperature is too low, is also easy to produce bainite structure, cold temperature impact
Can be poor, elongation percentage is low.Temperature is too high, finished product coarse grains, low intensity, and low temperature impact properties are poor.
The present invention by controlling 0.01%≤C≤0.07%, 0.15%≤Mn≤1.5%, P≤0.02% and S≤
0.010% percentage composition, while alloying element Ni 0.10~0.65% is added, Ti0.01%~0.03%, can effectively it carry
The low temperature impact properties of high weather resistance steel, wherein carbon raise the brittle transition temperature of normalizing carbon steel, decline ballistic work, it is seen that
Carbon is the harmful element for having on steel low-temperature impact work quite big influence；Manganese can reduce temperature of the austenite to ferritic transformation,
So that crystal grain refinement, the low temperature impact properties of steel are improved；The addition of nickel, the low-temperature impact absorbent properties of steel can be effectively improved；
Phosphorus is the element being harmful to steel toughness, often increases by 0.01%, but brittle transition temperature rises 7 DEG C, is also obviously promoted Temper brittleness
Property；Sulphur is also the element being harmful to steel toughness；The increase of titanium, the toughness of steel can be also significantly improved, the low-temperature impact for increasing steel is inhaled
Receive work(.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
Embodiment 1
The chemical component weight percentage of steel billet is：C：0.022%, Si：0.05%, Mn：0.22%%, P：0.008%,
S：0.002%, Cr：4.95%, Ni：0.15%, Cu：0.30%, Ti 0.02%, remaining is Fe and inevitable impurity.
Finish rolling start rolling temperature is 921 DEG C in hot-rolled step, and finishing temperature is 814 DEG C in hot-rolled step；Cooling step middle level
It is 85% to flow cooling upper header water ratio, and lower collector pipe water ratio is 100%；It is 545 DEG C to batch the temperature in step.
The weather-proof steel mechanical property Rel of high chromium of this method production：480MPa, Rm：595MPa, A%：27%；Low-temperature impact
Performance (- 40 DEG C)：347J, weather resistance (relatively corrosive rate)：22%.
Embodiment 2
The chemical component weight percentage of steel billet is：C：0.011%, Si：0.02%, Mn：0.16%, P：0.005%, S：
0.004%, Cr：4.55%, Ni：0.11%, Cu：0.22%, Ti 0.012%, remaining is Fe and inevitable impurity.
Finish rolling start rolling temperature is 905 DEG C in hot-rolled step, and finishing temperature is 802 DEG C in hot-rolled step；Cooling step middle level
It is 75% to flow cooling upper header water ratio, and lower collector pipe water ratio is 90%；It is 523 DEG C to batch the temperature in step.
The weather-proof steel mechanical property Rel of high chromium of this method production：475MPa, Rm：588MPa, A%：31%；Low-temperature impact
Performance (- 40 DEG C)：335J, weather resistance (relatively corrosive rate)：24%.
Embodiment 3
The chemical component weight percentage of steel billet is：C：0.024%, Si：0.09%, Mn：0.29%, P：0.009%, S：
0.003%, Cr：5.42%, Ni：0.21%, Cu：0.39%, Ti 0.012%, remaining is Fe and inevitable impurity.
Finish rolling start rolling temperature is 950 DEG C in hot-rolled step, and finishing temperature is 829 DEG C in hot-rolled step；Cooling step middle level
It is 80% to flow cooling upper header water ratio, and lower collector pipe water ratio is 95%；It is 557 DEG C to batch the temperature in step.
The weather-proof steel mechanical property Rel of high chromium of this method production：505MPa, Rm：625MPa, A%：29%；Low-temperature impact
Performance (- 40 DEG C)：319J, weather resistance (relatively corrosive rate)：21%.
Claims (3)
1. high chromium weathering steel, it is characterised in that：It is made up of following percentage by weight chemical composition：C 0.01~0.03%, Si
0.02~0.05%, Mn 0.15~0.30%, P ＜ 0.010%, S ＜ 0.005%, Cu 0.20~0.39%, Cr 4.50~
5.50%, Ni 0.10~0.15%, Ti 0.01~0.03%, remaining is Fe and inevitable impurity；
450~510MPa of yield strength of the high chromium weathering steel, 550~630MPa of tensile strength, elongation percentage >=25%, -40 DEG C
Lower low-temperature impact work >=300J, relatively corrosive rate≤25%；
Its preparation method mainly includes the following steps that：Steel billet → hot rolling → section cooling → batches, wherein, finish rolling in hot-rolled step
Start rolling temperature is 921 DEG C, and finishing temperature is 814 DEG C in hot-rolled step；Laminar flow cooling upper header water ratio is in cooling step
85%, lower collector pipe water ratio is 100%；It is 545 DEG C to batch the temperature in step.
2. high chromium weathering steel according to claim 1, it is characterised in that：It is made up of following percentage by weight chemical composition：C
0.02%, Si 0.05%, Mn 0.22%, P 0.008%, S 0.002%, Cu 0.30%, Cr 4.95%, Ni 0.15%,
Ti 0.02%, remaining is Fe and inevitable impurity.
3. the preparation method of the high chromium weathering steel of claim 1 or 2, this method mainly include the following steps that：Steel billet → hot rolling
→ section cooling → batch, it is characterised in that：The start rolling temperature of finish rolling is 921 DEG C in hot-rolled step, finish to gauge temperature in hot-rolled step
Spend for 814 DEG C；Laminar flow cooling upper header water ratio 85% in cooling step, lower collector pipe water ratio are 100%；Coiling temperature
For 545 DEG C.
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| CN112522598A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | High-corrosion-resistance steel and manufacturing method thereof |
| CN113846269B (en) * | 2021-09-29 | 2022-10-11 | 马鞍山钢铁股份有限公司 | Cold-rolled high-weather-resistance steel plate with high strength and plasticity and preparation method thereof |
| CN115449715B (en) * | 2022-09-21 | 2023-08-11 | 马鞍山钢铁股份有限公司 | Cold-rolled weather-resistant steel plate, production method thereof and method for producing cold-rolled weather-resistant steel plates of different grades under same components |
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| CN101376953A (en) * | 2007-08-28 | 2009-03-04 | 宝山钢铁股份有限公司 | High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof |
| CN102127717A (en) * | 2010-01-18 | 2011-07-20 | 宝山钢铁股份有限公司 | Cr-contained weathering steel with excellent toughness and high corrosion resistance |
| CN105063488A (en) * | 2015-07-30 | 2015-11-18 | 中国电力科学研究院 | Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel |
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| JP2006037201A (en) * | 2004-07-29 | 2006-02-09 | Kobe Steel Ltd | Marine steel material superior in corrosion resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101376953A (en) * | 2007-08-28 | 2009-03-04 | 宝山钢铁股份有限公司 | High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof |
| CN102127717A (en) * | 2010-01-18 | 2011-07-20 | 宝山钢铁股份有限公司 | Cr-contained weathering steel with excellent toughness and high corrosion resistance |
| CN105063488A (en) * | 2015-07-30 | 2015-11-18 | 中国电力科学研究院 | Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel |
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