CN108342662A - A kind of yield strength 550MPa grade high-strength weathering steels - Google Patents
A kind of yield strength 550MPa grade high-strength weathering steels Download PDFInfo
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- CN108342662A CN108342662A CN201810154871.7A CN201810154871A CN108342662A CN 108342662 A CN108342662 A CN 108342662A CN 201810154871 A CN201810154871 A CN 201810154871A CN 108342662 A CN108342662 A CN 108342662A
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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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
Abstract
The present invention provides a kind of yield strength 550MPa grade high-strength weathering steels.The yield strength 550MPa grade high-strengths weathering steel chemical component weight percentage is C：0.03~0.08wt%, Si≤0.15wt%, Mn：0.70~1.40wt%, P≤0.020wt%, S≤0.008wt%, Alt：0.020~0.050wt%, N≤0.006wt%, Cu：0.20~0.55wt%, Cr：0.30~0.60wt%, Ni：0.04~0.20wt%, Ti：0.05~0.09wt%；Surplus is Fe and inevitable trace element.The present invention does not add niobium, vanadium by the optimization design of ingredient, reduces cost, and strictly control N content in steel, realizes the steady production of the product, obtains stable mechanical performance and clod wash, the good high-strength weathering steel of impact property.
Description
Technical field
The present invention relates to field of metallurgy, and in particular to a kind of yield strength 550MPa grade high-strength weathering steels.
Background technology
High-strength weathering steel refers to the weathering steel (weather resisting steel) of yield strength >=450MPa.Development and production high-strength weathering
Steel mainly meets a new generation's container, railroad freight car, speed train cars, communication and power transmission tower frame, bridge and heavy duty
The update demand of the industries steel such as automobile making is realized and improves intensity, mitigates dead weight, energy-saving safety and environmental protection
It is required that.With China's economic development, logistics rapidly increases, and high-strength weathering steel is in loss of weight, speed-raising, the increase volume of goods transported, reduction object
Stream cost and extension service life of equipment etc. all play an important role.
Chinese Patent Application No. 200910301054.0 discloses a kind of high-strength weather resisting steel and its production method,
The chemical composition that this method manufactures atmospheric corrosion resistance steel plate is C≤0.12wt%, Si≤0.75wt%, Mn≤l.5wt%, P≤
0.025 wt%, S≤0.008wt%, Cr：0.30-1.25wt%, Ni：O.12-0.65wt%, Cu：O.2-0.55wt%, Nb：
0.015-0.03wt%, V：0.09-0.15wt%, Ti：0.006-0.02wt%, N：0.0l-0.02wt%, remaining for Fe and
Inevitable impurity.This method adds the precious alloys such as Nb, V in steel, and production cost is high.
In conclusion problems with exists in the prior art：Existing high-strength weathering steel production cost is high.
Invention content
The present invention provides a kind of yield strength 550MPa grade high-strength weathering steels, is given birth to solving existing high-strength weathering steel
Produce problem of high cost.
For this purpose, a kind of yield strength 550MPa grade high-strength weathering steels of present invention proposition, described yield strength 550MPa grades
High-strength weathering steel chemical component weight percentage is C：0.03~0.08wt%, Si≤0.15wt%, Mn：0.70~
1.40wt%, P≤0.020wt%, S≤0.008wt%, Alt (total content of full aluminium or Al)：0.020~0.050wt%, N
≤ 0.006wt%, Cu：0.20~0.55wt%, Cr：0.30~0.60wt%, Ni：0.04~0.20wt%, Ti：0.05~
0.09wt%；Surplus is Fe and inevitable trace element.
Further, the yield strength 550MPa grade high-strengths weathering steel chemical component weight percentage is C：
0.054wt%, Si：0.057wt%, Mn：0.81wt%, P：0.012wt%, S：0.002wt%, Alt：0.036wt%, N：
0.29wt%, Cu：0.26wt%, Cr：0.35wt%, Ni：0.09wt%, Ti：0.077wt%；Surplus is for Fe and unavoidably
Trace element, product yield strength ReL >=550MPa, tensile strength Rm are 620~800MPa, elongation percentage A >=18%, -40
DEG C impact absorbing energy Akv >=38J.
Further, the yield strength 550MPa grade high-strengths weathering steel chemical component weight percentage is C：
0.063wt%, Si：0.057wt%, Mn：1.24wt%, P：0.013wt%, S：0.002wt%, Alt：0.037wt%, N：
0.28wt%, Cu：0.26wt%, Cr：0.36wt%, Ni：0.09wt%, Ti：0.058wt%；Surplus is for Fe and unavoidably
Trace element, product yield strength ReL >=550MPa, tensile strength Rm are 620~800MPa, elongation percentage A >=18%, -40
DEG C impact absorbing energy Akv >=38J.
The yield strength 550MPa grade high-strength weathering steels use following manufacturing method, and the manufacturing method includes following
The processing step carried out successively：Blast-melted smelting, desulfurizing iron pre-process, converter molten steel is smelted, LF liquid steel refinings are handled,
It is the processing of RH liquid steel refinings, sheet billet continuous casting, hot continuous rolling, smooth, wherein in converter molten steel smelting step：Enter stove molten iron requirement S≤
0.040wt%；Smelting process is using whole argon bottom-blowing；Converter terminal controls C≤0.05wt%, P≤0.018wt%.
Further, in RH liquid steel refinings processing step：Vacuum 15~30min of total cycle time, when end vacuum is kept
Between 10min or more；Net circulation time 3min or more；Soft 8~10min of argon blowing time after Calcium treatment；The molten steel calmness time >=
18min。
Further, in sheet billet continuous casting step：Using ladle roughing slag detect control, basket pouring temperature be 1530~
1560 DEG C, tundish uses alkaline covering agent, and using low-carbon steel protecting slag, Casting speed is 1.00~1.42m/min.
Further, in hot continuous rolling step：It is 1200~1250 DEG C to control slab heating temperature, ensures strand in furnace temperature
Retention time >=180min under the conditions of >=1100 DEG C makes titanium micro-alloyed abundant solid solution to control autstenitic grain size, utmostly
Play the solid solution strengthening effect of titanium microalloying；Using seven rack continuous hot-rolling mills, finishing temperature control is at 880~920 DEG C, volume
Take 590~630 DEG C of temperature.
Further, finished product thickness 6mm, 1246 DEG C of heating furnace soaking temperature, in the furnace temperature >=1100 DEG C retention time
196min, finishing temperature control is at 898 DEG C, 608 DEG C of coiling temperature.
Further, finished product thickness 6mm, 1250 DEG C of heating furnace soaking temperature, in the furnace temperature >=1100 DEG C retention time
185min, finishing temperature control is at 895 DEG C, 612 DEG C of coiling temperature.
Further, finished product thickness 6mm, 1248 DEG C of heating furnace soaking temperature, in the furnace temperature >=1100 DEG C retention time
189min, finishing temperature control is at 901 DEG C, 610 DEG C of coiling temperature.
The present invention does not add niobium, vanadium by the optimization design of ingredient, reduces cost, and strictly control N content in steel, real
The now steady production of the product obtains stable mechanical performance and clod wash, the good high-strength weathering steel of impact property.The present invention
The cold rolling low-alloy high-strength steel yield strength R of gainedeL>=550MPa, tensile strength RmFor 620~800MPa, elongation percentage A >=
18%, -40 DEG C of impact absorbing energy Akv≥38J。
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now illustrate the present invention.
The yield strength 550MPa grade high-strength weathering steels of the present invention, chemical component weight percentage C：0.03~
0.08wt%, Si≤0.15wt%, Mn：0.70~1.40wt%, P≤0.020wt%, S≤0.008wt%, Alt：0.020
~0.050wt%, N≤0.006wt%, Cu：0.20~0.55wt%, Cr：0.30~0.60wt%, Ni：0.04~
0.20wt%, Ti：0.05~0.09wt%；Surplus is Fe and inevitable trace element.
The manufacturing method of the yield strength 550MPa grade high-strength weathering steels of the present invention, process route are：It is blast-melted
Smelting → desulfurizing iron pretreatment → converter molten steel smelting → LF (ladle refining furnace) liquid steel refining processing → RH (vacuum cycles
Deaerate refining furnace) liquid steel refining processing → sheet billet continuous casting → hot continuous rolling → smooth → test package storage；Wherein, each stage
Process characteristic is：
Converter molten steel is smelted：Enter stove molten iron requirement S≤0.040wt%；Smelting process is using whole argon bottom-blowing；Converter is whole
Point control C≤0.05wt%, P≤0.018wt%；
The processing of LF liquid steel refinings：Molten steel carries out deoxidation and alloying processing in LF stoves；
The processing of RH liquid steel refinings：Vacuum 15~30min of total cycle time, end vacuum retention time 10min or more；Only it follows
Ring time 3min or more；Soft 8~10min of argon blowing time after Calcium treatment；Molten steel calmness time >=18min；
Sheet billet continuous casting:It is detected and is controlled using ladle roughing slag, basket pouring temperature is 1530~1560 DEG C, and tundish uses
Alkaline covering agent, using low-carbon steel protecting slag, Casting speed is 1.00~1.42m/min.
High-precision continuous casting control technique：Take that " weak cold+low overheat+perseverance pulling rate+high straightening temperature casting process is ((1.,
Weak cold：It is that production is other same strong the present invention relates to the used cooling water pressure of steel grade and flow under the same casting machine condition of production
Spend the 85%~95% of rank steel grade；2., low overheat：It is controlled by 0~20 DEG C；3., permanent pulling rate：Pulling speed of continuous casting fluctuates
Scope control is within 0.1m/min；4., high straightening temperature：Continuous casting billet straightening temperature is improved to 900~950 DEG C, avoids strand
730 DEG C~880 DEG C of high-temperature brittleness section) ", effectively reduce the generation of slab surface cracks.
Hot continuous rolling：It is 1200~1250 DEG C to control slab heating temperature, ensures strand under the conditions of furnace temperature >=1100 DEG C
Retention time >=180min makes titanium micro-alloyed abundant solid solution to control autstenitic grain size, utmostly plays titanium microalloying
Solid solution strengthening effect；Using seven rack continuous hot-rolling mills, finishing temperature control is at 880~920 DEG C, coiling temperature 590~630
℃。
In the present invention, measure is also taken：
N≤0.006wt% in molten steel is controlled, Ti and precipitations of the N in liquid molten steel during sheet billet continuous casting, energy are reduced
Enough reduce destruction of the coarse TiN precipitates of size to the weather-proof steel toughness of 550MPa grade high-strengths；
A small amount of Ti is added in steel, to reduce the N content with Al element reactions, so that the precipitation of AlN is suppressed, effectively
Reduction strand face crack.
The production method of the yield strength 550MPa grade high-strength weathering steels of the present invention is using following compositions proportioning and specifically
Technique.Wherein, table 1 is the ingredient (by weight percentage) of each embodiment steel.Table 2 is work corresponding with embodiment described in table 1
Skill parameter.Table 3 is mechanical property corresponding with 1 each embodiment of table.Wherein, example 1 is identical with the ingredient of example 2 in table 1, but
Technological parameter is different, and example 3 is identical with the ingredient of example 4, but technological parameter is different, and example 1 is different with the ingredient of example 3.
The yield strength 550MPa grade high-strengths weathering steel and its manufacturing method of the present invention so that product yield strength ReL≥
550MPa, tensile strength RmFor 620~800MPa, elongation percentage A >=18%, -40 DEG C of impact absorbing energy Akv≥38J。
Further, product yield strength ReL>=590MPa, tensile strength RmMore than 650MPa, elongation percentage A >=20% ,-
40 DEG C of impact absorbing energy Akv≥42J.Wherein, elongation percentage A can reach 23.3%, -40 DEG C of impact absorbing energy AkvIt can reach 52J.
Further, product yield strength ReL>=610MPa, tensile strength RmMore than 670MPa, elongation percentage A >=21% ,-
40 DEG C of impact absorbing energy Akv≥47J。
Further, product yield strength ReL>=620MPa, tensile strength RmMore than 680MPa, elongation percentage A >=20% ,-
40 DEG C of impact absorbing energy Akv≥45J。
Further, product yield strength ReL>=630MPa, tensile strength RmMore than 700MPa, elongation percentage A >=21% ,-
40 DEG C of impact absorbing energy Akv≥42J。
Table 1：Product chemical composition (wt%)
| Example | C | Si | Mn | P | S | Alt | Ti | Cu | Ni | Cr | N |
| Example 1 | 0.054 | 0.057 | 0.81 | 0.012 | 0.002 | 0.036 | 0.077 | 0.26 | 0.09 | 0.35 | 0.29 |
| Example 2 | 0.054 | 0.057 | 0.81 | 0.012 | 0.002 | 0.036 | 0.077 | 0.26 | 0.09 | 0.35 | 0.29 |
| Example 3 | 0.063 | 0.057 | 1.24 | 0.013 | 0.002 | 0.037 | 0.058 | 0.26 | 0.09 | 0.36 | 0.28 |
| Example 4 | 0.063 | 0.057 | 1.24 | 0.013 | 0.002 | 0.037 | 0.058 | 0.26 | 0.09 | 0.36 | 0.28 |
Table 2：Each specific technological parameter of embodiment
Table 3：The mechanical property of low-alloy high-strength steel obtained by each embodiment
The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.For this
Each component part of invention can be combined with each other under conditions of not conflicting, any those skilled in the art, not depart from this
Made equivalent variations and modification, should all belong to the scope of protection of the invention under the premise of the design of invention and principle.
Claims (10)
1. a kind of yield strength 550MPa grade high-strength weathering steels, which is characterized in that the yield strength 550MPa grade high-strengths
Weathering steel chemical component weight percentage is C：0.03~0.08wt%, Si≤0.15wt%, Mn：0.70~1.40wt%, P≤
0.020wt%, S≤0.008wt%, Alt：0.020~0.050wt%, N≤0.006wt%, Cu：0.20~0.55wt%,
Cr：0.30~0.60wt%, Ni：0.04~0.20wt%, Ti：0.05~0.09wt%；Surplus be Fe and inevitably it is micro-
Secondary element.
2. yield strength 550MPa grade high-strength weathering steels as described in claim 1, which is characterized in that the yield strength
550MPa grade high-strength weathering steel chemical component weight percentages are C：0.054wt%, Si：0.057wt%, Mn：0.81wt%,
P：0.012wt%, S：0.002wt%, Alt：0.036wt%, N：0.29wt%, Cu：0.26wt%, Cr：0.35wt%, Ni：
0.09wt%, Ti：0.077wt%；Surplus is Fe and inevitably micro-, product yield strength ReL>=550MPa resists
Tensile strength RmFor 620~800MPa, elongation percentage A >=18%, -40 DEG C of impact absorbing energy Akv≥38J。
3. yield strength 550MPa grade high-strength weathering steels as described in claim 1, which is characterized in that the yield strength
550MPa grade high-strength weathering steel chemical component weight percentages are C：0.063wt%, Si：0.057wt%, Mn：1.24wt%,
P：0.013wt%, S：0.002wt%, Alt：0.037wt%, N：0.28wt%, Cu：0.26wt%, Cr：0.36wt%, Ni：
0.09wt%, Ti：0.058wt%；Surplus is Fe and inevitably micro-, product yield strength ReL>=550MPa resists
Tensile strength RmFor 620~800MPa, elongation percentage A >=18%, -40 DEG C of impact absorbing energy Akv≥38J。
4. yield strength 550MPa grade high-strength weathering steels as described in claim 1, which is characterized in that yield strength 550MPa
It includes the processing step that next coming in order carry out that grade high-strength weathering steel, which uses following manufacturing method, the manufacturing method,：Blast furnace iron
Hydrometallurgy refining, desulfurizing iron pretreatment, converter molten steel smelting, the processing of LF liquid steel refinings, the processing of RH liquid steel refinings, sheet billet continuous casting, heat
It is tandem rolling, smooth, wherein in converter molten steel smelting step：Enter stove molten iron requirement S≤0.040wt%；Smelting process is using whole bottom
Blowing argon gas；Converter terminal controls C≤0.05Wt%, P≤0.018Wt%.
5. yield strength 550MPa grade high-strength weathering steels as claimed in claim 4, which is characterized in that the processing of RH liquid steel refinings
In step：Vacuum 15~30min of total cycle time, end vacuum retention time 10min or more；Net circulation time 3min or more；
Soft 8~10min of argon blowing time after Calcium treatment；Molten steel calmness time >=18min.
6. yield strength 550MPa grade high-strength weathering steels as claimed in claim 4, which is characterized in that sheet billet continuous casting step
In：It is detected and is controlled using ladle roughing slag, basket pouring temperature is 1530~1560 DEG C, and tundish uses alkaline covering agent, makes
With low-carbon steel protecting slag, Casting speed is 1.00~1.42m/min.
7. yield strength 550MPa grade high-strength weathering steels as claimed in claim 4, which is characterized in that in hot continuous rolling step：
Control slab heating temperature be 1200~1250 DEG C, ensure strand under the conditions of furnace temperature >=1100 DEG C the retention time >=
180min makes titanium micro-alloyed abundant solid solution to control autstenitic grain size, utmostly plays the solution strengthening of titanium microalloying
Effect；Using seven rack continuous hot-rolling mills, finishing temperature control is at 880~920 DEG C, 590~630 DEG C of coiling temperature.
8. yield strength 550MPa grade high-strength weathering steels as claimed in claim 4, which is characterized in that finished product thickness 6mm,
1246 DEG C of heating furnace soaking temperature, in furnace temperature >=1100 DEG C retention time 196min, finishing temperature control is batched at 898 DEG C
608 DEG C of temperature.
9. yield strength 550MPa grade high-strength weathering steels as claimed in claim 4, which is characterized in that finished product thickness 6mm,
1250 DEG C of heating furnace soaking temperature, in furnace temperature >=1100 DEG C retention time 185min, finishing temperature control is batched at 895 DEG C
612 DEG C of temperature.
10. yield strength 550MPa grade high-strength weathering steels as claimed in claim 4, which is characterized in that finished product thickness is
6mm, 1248 DEG C of heating furnace soaking temperature, in furnace temperature >=1100 DEG C retention time 189min, finishing temperature control at 901 DEG C,
610 DEG C of coiling temperature.
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Cited By (6)
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| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN109338212A (en) * | 2018-09-26 | 2019-02-15 | 武汉钢铁有限公司 | Using the yield strength >=550MPa thin gauge weathering steel and method of short route production |
| CN110923403A (en) * | 2019-11-15 | 2020-03-27 | 柳州钢铁股份有限公司 | Control method for improving P center segregation of weathering steel |
| CN111101071A (en) * | 2020-02-25 | 2020-05-05 | 湖南华菱涟源钢铁有限公司 | High-strength weathering steel and production method thereof |
| CN111926261A (en) * | 2020-08-31 | 2020-11-13 | 日照钢铁控股集团有限公司 | High-strength weathering steel with yield strength of 550MPa and production method thereof |
| CN113234988A (en) * | 2021-04-15 | 2021-08-10 | 华南理工大学 | Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof |
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| CN111926261A (en) * | 2020-08-31 | 2020-11-13 | 日照钢铁控股集团有限公司 | High-strength weathering steel with yield strength of 550MPa and production method thereof |
| CN113234988A (en) * | 2021-04-15 | 2021-08-10 | 华南理工大学 | Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof |
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| CN108342662B (en) | 2020-03-10 |
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