CN109554623A - 550MPa grades of Weather-resistance bridge steel plates of yield strength and its production method - Google Patents
550MPa grades of Weather-resistance bridge steel plates of yield strength and its production method Download PDFInfo
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- CN109554623A CN109554623A CN201811494831.3A CN201811494831A CN109554623A CN 109554623 A CN109554623 A CN 109554623A CN 201811494831 A CN201811494831 A CN 201811494831A CN 109554623 A CN109554623 A CN 109554623A
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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
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—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
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of yield strength 550MPa grades of Weather-resistance bridge steel plates and its production methods, its chemical component and its mass percentage are as follows: C 0.03%~0.07%, Mn 1.35%~1.45%, S≤0.005%, P 0.012%~0.018%, Si 0.25%~0.35%, Als 0.020%~0.050%, Nb 0.025%~0.034%, Ti 0.010%~0.025%, Cr 0.50%~0.70%, Ni 0.35%~0.45%, Cu 0.30%~0.45%, Mo 0.10%~0.30%, surplus are Fe and inevitable impurity.This plate property is excellent, solderability is good, with excellent low-temperature impact toughness, and has stronger weatherability；Production method does not need simply to carry out quenched (quenching+high tempering) processing, lower production costs；It is the highest Weather-resistance bridge steel of yield strength grade in current bridge steel standard.This method product has good weatherability, weather-proof sex index I >=6.5；With excellent welding performance, welding crack sensibility indices P cm≤0.24；With excellent notch impact toughness, -40 DEG C, v-notch ballistic work >=200J；Tensile strength >=670MPa, yield strength >=550MPa, elongation percentage A >=16%.
Description
Technical field
The invention belongs to metallurgical technology field more particularly to a kind of yield strength 550MPa grades of Weather-resistance bridge steel plate and
Its production method.
Background technique
Although the intensity rank of bridge steel is increased to 690MPa grades by the GB/T714-2015 standard newly revised, the country
The highest bridge steel intensity rank used so far is the Shanghai Changjiang River bridge for starting construction for 2014, strong for surrender
The Q500qE of 500MPa grades of degree.In terms of Weather-resistance bridge steel, the application development in China is slower, and Wuhan Iron and Steel Plant takes the lead within 1989
It patrols on Si Heqiao and has carried out the exposed use test of 345MPa grades of weathering steels of yield strength, but is undesirable.Recent Weather-resistance bridge steel
Develop into one of industrial hot spot, Anshan iron and steel plant etc. is carrying out 345MPa grades of Weather-resistance bridge steel semi-nudity application practices of yield strength；South
Steel Weather-resistance bridge has been applied to the Sichuan-Tibet railway built and has hidden the wooden grand bridge, and highest yield strength rank reaches Q420qDNH.
The bridge steel standard GB/T714-2015 newly revised for 2015 has re-started stroke the intensity rank of bridge steel
Point, Q550qNH is the highest yield strength grade in Weather-resistance bridge steel in the standard, and defined production method is to adjust
Matter (quenching+high tempering) production.Application No. is a kind of " high-strength tenacity structural steel for bridge of CN201711181307.6
Q550qFNH cut deal and its production method " in describe a kind of Q550qFNH and its production method, but its thickness specification is big
In 70mm, and the condition of delivery is quenched and tempered state (quenching+high tempering)；Although the steel grade also has certain weatherability, resistance to
Scaling index only exists in >=6.0 basic horizontal.
Summary of the invention
550MPa grades of yield strength the technical problem to be solved in the present invention is to provide a kind of fine corrosion resistance are weather-proof
Bridge steel plate；The present invention also provides a kind of production methods of yield strength 550MPa grades of Weather-resistance bridge steel plates.
In order to solve the above technical problems, chemical component adopted by the present invention and its mass percentage are as follows: C 0.03%
~0.07%, Mn 1.35%~1.45%, S≤0.005%, P 0.012%~0.018%, Si 0.25%~0.35%,
Als 0.020%~0.050%, Nb 0.025%~0.034%, Ti 0.010%~0.025%, Cr 0.50%~
0.70%, Ni 0.35%~0.45%, Cu 0.30%~0.45%, Mo 0.10%~0.30%, surplus are Fe and can not
The impurity avoided.
Steel plate thickness of the present invention is 12~60mm, and the condition of delivery is TMCP+ tempering.
Weather-proof sex index I >=6.5 of steel plate of the present invention, welding crack sensibility indices P cm≤0.24.
The method of the present invention includes continuous casting, heating, roughing, finish rolling, cooling process and tempering heat treatment process；
The roughing operation, 1000~1050 DEG C of start rolling temperature, finishing temperature >=970 DEG C, total reduction >=50%；
The finishing rolling step, start rolling temperature≤950 DEG C, total reduction >=50%, 770~810 DEG C of finishing temperature；
The cooling process, final cooling temperature are 350~550 DEG C；
The tempering heat treatment process, keeps the temperature 55~65min by 550~600 DEG C of tempering temperature.
Heating process described in the method for the present invention, slab enter heating furnace in room temperature, and heating time is 0.9~1.1min/mm
Slab thickness.
The beneficial effects of adopting the technical scheme are that the present invention is had excellent performance, solderability is good, it is excellent to have
Good low-temperature impact toughness, and there is stronger weatherability；Production method does not need simply to carry out quenched (quenching+high temperature time
Fire) processing, lower production costs；It is the highest Weather-resistance bridge steel of yield strength grade in current bridge steel standard.
The method of the present invention product has good weatherability, weather-proof sex index I >=6.5；With excellent welding performance,
Welding crack sensibility indices P cm≤0.24；With excellent notch impact toughness, -40 DEG C, v-notch ballistic work >=
200J；Tensile strength >=670MPa, yield strength >=550MPa, elongation percentage A >=16%；The condition of delivery is TMCP+ tempering, with
The condition of delivery of quenched (quenching+tempering), which is compared, has apparent cost advantage.
Specific embodiment
The present invention will be further described in detail with reference to the specific embodiments.
Embodiment 1-30: 550MPa grades of Weather-resistance bridge steel plates of this yield strength and its production method are described in detail below.
1, this method include molten iron pretreatment, it is converter smelting, LF refining, RH refining, continuous casting, heating, roughing, finish rolling, cold
But process and tempering heat treatment process, each process technique are as described below:
(1) continuous casting working procedure: the molten steel after molten iron pretreatment, converter smelting, LF refining, RH refining obtains thickness through continuous casting
Degree is 200~280mm slab；Continuous casting process is using electromagnetic agitation and weight Reduction Technology；The offline slow cooling of slab is to room temperature, slow cooling
Time >=36 hour.
(2) heating process: the slab of room temperature enters heating furnace, and heating time is 0.9~1.1min/mm slab thickness.
(3) roughing operation: 1000~1050 DEG C of start rolling temperature, finishing temperature >=970 DEG C, total reduction >=50%.
(4) finishing rolling step: start rolling temperature≤950 DEG C, total reduction >=50%, 770~810 DEG C of finishing temperature.
(5) cooling process: use ultrafast cooling, cooling velocity highest can be 120 DEG C/s, final cooling temperature be 350~
550℃。
(6) heat treatment procedure: radiant tube type tempering furnace is used, 550~600 DEG C of tempering temperature, keeps the temperature 55~65min.
The specific process parameter of the continuous casting of each embodiment, heating and roughing operation is shown in Table 1, finish rolling, cooling and heat treatment work
The specific process parameter of sequence is shown in Table 2.
Table 1: the concrete technology of continuous casting to roughing operation
Table 2: the concrete technology of finish rolling to heat treatment procedure
2, the chemical component of Weather-resistance bridge steel plate obtained by each embodiment and mass percentage are shown in Table 3, and surplus is for Fe and not
Evitable impurity.
Table 3: the chemical component and content (wt%) of steel plate obtained by each embodiment
3, the thickness of Weather-resistance bridge steel plate obtained by each embodiment, weather-proof sex index I, welding crack sensibility indices P cm,
Mechanical property and impact flexibility are shown in Table 4.
Table 4: the performance indicator of steel plate obtained by each embodiment
In table 4, embodiment 1-18 is whole plate stretching；Embodiment 19-21,25-27 is thickness direction a quarter position
The φ 10mm pole set stretches and impact；Embodiment 22-24,28-30 is the φ 10mm circle of thickness direction half position
Stick stretches and impact.
Claims (5)
1. a kind of yield strength 550MPa grades of Weather-resistance bridge steel plates, which is characterized in that its chemical component and its mass percentage
Are as follows: C 0.03%~0.07%, Mn 1.35%~1.45%, S≤0.005%, P 0.012%~0.018%, Si 0.25%~0.35%,
Als 0.020%~0.050%, Nb 0.025%~0.034%, Ti 0.010%~0.025%, Cr 0.50%~0.70%, Ni
0.35%~0.45%, Cu 0.30%~0.45%, Mo 0.10%~0.30%, surplus are Fe and inevitable impurity.
2. yield strength 550MPa grades of Weather-resistance bridge steel plates according to claim 1, it is characterised in that: the steel plate thickness
For 12~60mm, the condition of delivery is TMCP+ tempering.
3. yield strength 550MPa grades of Weather-resistance bridge steel plates according to claim 1 or 2, it is characterised in that: the steel plate
Weather-proof sex index I >=6.5, welding crack sensibility indices P cm≤0.24.
4. the production method of yield strength 550MPa grades of Weather-resistance bridge steel plate described in claim 1, it is characterised in that: it includes connecting
Casting, heating, roughing, finish rolling, cooling process and tempering heat treatment process；
The roughing operation, 1000~1050 DEG C of start rolling temperature, finishing temperature >=970 DEG C, total reduction >=50%；
The finishing rolling step, start rolling temperature≤950 DEG C, total reduction >=50%, 770~810 DEG C of finishing temperature；
The cooling process, final cooling temperature are 350~550 DEG C；
The tempering heat treatment process, keeps the temperature 60min by 550~600 DEG C of tempering temperature.
5. the production method of yield strength 550MPa grades of Weather-resistance bridge steel plates according to claim 4, it is characterised in that: institute
Heating process is stated, slab enters heating furnace in room temperature, and heating time is 0.9~1.1min/mm slab thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811494831.3A CN109554623A (en) | 2018-12-07 | 2018-12-07 | 550MPa grades of Weather-resistance bridge steel plates of yield strength and its production method |
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| CN201811494831.3A CN109554623A (en) | 2018-12-07 | 2018-12-07 | 550MPa grades of Weather-resistance bridge steel plates of yield strength and its production method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110863139A (en) * | 2019-10-31 | 2020-03-06 | 鞍钢股份有限公司 | Ultralow-temperature-impact-resistant 420 MPa-grade weather-resistant bridge steel and production method thereof |
| CN111118401A (en) * | 2020-02-28 | 2020-05-08 | 五矿营口中板有限责任公司 | High-performance large-thickness easy-to-weld bridge structural steel and manufacturing method thereof |
| CN111455287A (en) * | 2020-03-30 | 2020-07-28 | 南京钢铁股份有限公司 | 500 MPa-grade low-yield-ratio weather-resistant bridge steel and manufacturing method thereof |
| CN114262841A (en) * | 2021-10-26 | 2022-04-01 | 包头钢铁（集团）有限责任公司 | 420 MPa-level weather-resistant structural steel with impact work of more than 150J at-80 ℃ and production method thereof |
| CN114606436A (en) * | 2022-02-14 | 2022-06-10 | 包头钢铁（集团）有限责任公司 | 370 MPa-grade rare earth weather-resistant structural steel for polar region and production method thereof |
| CN114645201A (en) * | 2022-03-14 | 2022-06-21 | 安阳钢铁股份有限公司 | High-toughness Q500qNH bridge weather-resistant steel plate and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110863139A (en) * | 2019-10-31 | 2020-03-06 | 鞍钢股份有限公司 | Ultralow-temperature-impact-resistant 420 MPa-grade weather-resistant bridge steel and production method thereof |
| CN111118401A (en) * | 2020-02-28 | 2020-05-08 | 五矿营口中板有限责任公司 | High-performance large-thickness easy-to-weld bridge structural steel and manufacturing method thereof |
| CN111455287A (en) * | 2020-03-30 | 2020-07-28 | 南京钢铁股份有限公司 | 500 MPa-grade low-yield-ratio weather-resistant bridge steel and manufacturing method thereof |
| CN114262841A (en) * | 2021-10-26 | 2022-04-01 | 包头钢铁（集团）有限责任公司 | 420 MPa-level weather-resistant structural steel with impact work of more than 150J at-80 ℃ and production method thereof |
| CN114606436A (en) * | 2022-02-14 | 2022-06-10 | 包头钢铁（集团）有限责任公司 | 370 MPa-grade rare earth weather-resistant structural steel for polar region and production method thereof |
| CN114645201A (en) * | 2022-03-14 | 2022-06-21 | 安阳钢铁股份有限公司 | High-toughness Q500qNH bridge weather-resistant steel plate and manufacturing method thereof |
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Application publication date: 20190402 |