CN109161793A - A kind of low yield strength ratio high-strength weathering steel and its production method - Google Patents
A kind of low yield strength ratio high-strength weathering steel and its production method Download PDFInfo
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- CN109161793A CN109161793A CN201810997433.7A CN201810997433A CN109161793A CN 109161793 A CN109161793 A CN 109161793A CN 201810997433 A CN201810997433 A CN 201810997433A CN 109161793 A CN109161793 A CN 109161793A
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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
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C22C38/04—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
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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
-
- 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
Abstract
The invention discloses a kind of low yield strength ratio high-strength weathering steel and its production method, the weather-proof steel chemical composition composition and mass percentage are as follows: C:0.08~0.10%, Si:0.25~0.30%, Mn:1.30~1.50%, P≤0.010%, S≤0.010%, Ni:0.25~0.30%, Cr:0.45~0.50%, Cu:0.25~0.35%, Al:0.02~0.04%, Nb:0.020~0.030%, Ti:0.010~0.020%, surplus are Fe and inevitable impurity element；The production method includes smelting, continuous casting, slab heating, controlled rolling, control cooling process.The present invention is designed by ingredient and cooling controlling and rolling controlling process, ensure that the corrosion resisting property of steel, obtains ferrite+bainite+pearlitic structrure of fine uniform, improve the obdurability and shock resistance of steel.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of low yield strength ratio high-strength weathering steel and its production method.
Background technique
The etching problem of steel material is always a global problem, it does not only result in the report of metal equipment and material
It is useless, it results in significant economic losses, notably brings the social concern of the sternness such as environmental pollution, casualties.
Hot spot product weathering steel, that is, a kind of weather resisting steel of society research now and application, weather resistance is common
2~8 times of carbon steel have apparent protective action to corrosion.As advanced steel product of new generation, weathering steel, which also has, to be exempted to apply
Dress is thinned consumption reduction, the features such as saving of labor is energy saving, therefore has been widely used in the fields such as building, rail truck, bridge.With society
The progress and the development in epoch of meeting, demand of the people to weathering steel is increasing, mutually copes with its requirement and is also gradually increased.
Traditional weathering steel yield strength is based on 345MPa rank mostly at present, and intensity rank is lower, this restricts weather-proof
The promotion and application of steel；On the other hand taken place frequently due to China's earthquake, the higher weathering steel of intensity, yield tensile ratio is higher, shock resistance compared with
Difference is easy to happen brittle break in earthquake, is not suitable for the fields such as building.Therefore the exploitation tool of low yield strength ratio high-strength weathering steel
There are highly important Practical significance and economic value.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low yield strength ratio high-strength weathering steel and its production method, this method
The corrosion resisting property of steel is realized by adding the chemical elements such as appropriate Cu, Cr, Ni, and ferrite+shellfish is obtained by controlled rolling and controlled cooling
Family name's body+pearlitic structrure realizes that steel are high-strength, performance of low yield strength ratio.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of low yield strength ratio high-strength weathering steel, institute
State weather-proof steel chemical composition composition and its mass percentage are as follows: C:0.08~0.10%, Si:0.25~0.30%, Mn:1.30~
1.50%, P≤0.010%, S≤0.010%, Ni:0.25~0.30%, Cr:0.45~0.50%, Cu:0.25~0.35%, Al:
0.02~0.04%, Nb:0.020~0.030%, Ti:0.010~0.020%, surplus are Fe and inevitable impurity element.
Weathering steel of the present invention is with a thickness of 6~12mm；Weather-proof structure of steel is ferrite+bainite+pearlitic structrure.
Weather-proof Steel Properties of the present invention, yield strength: 428.5~444.3MPa, tensile strength: 663.2~
673.3MPa, yield tensile ratio≤0.66, elongation after fracture >=21%, -40 DEG C of impact of collision function >=66J.
The present invention also provides a kind of production method of low yield strength ratio high-strength weathering steel, the production method include smelt,
Continuous casting, slab heating, controlled rolling, control cooling process；The controlled rolling process, roughing start rolling temperature are 1050~1150
DEG C, roughing single pass reduction ratio is 20~30%, finish rolling start rolling temperature is 950~980 DEG C, finish rolling single pass reduction ratio be 20~
25%；The control cooling process, cooling rate are 15~20 DEG C/s, and final cooling temperature is 610~640 DEG C.
Slab heating process of the present invention, 1200~1250 DEG C of slab heating temperature, 1~2h of soaking time.
Controlled rolling process of the present invention, roughing start rolling temperature are 1050~1150 DEG C, and roughing single pass reduction ratio is
20~30%, roughing accumulation reduction ratio >=80%, 993~1088 DEG C of roughing finishing temperature.
Controlled rolling process of the present invention, finish rolling start rolling temperature are 950~980 DEG C, and finish rolling single pass reduction ratio is 20
~25%, finish rolling finishing temperature is 800~850 DEG C.
Control cooling process of the present invention, control is cooling to use section cooling, and cooling rate is 15~20 DEG C/s, cold eventually
Temperature is 610~640 DEG C, is air-cooled to room temperature later.
Each chemical component effect of the present invention and content:
C plays the role of solution strengthening in steel, very big to the intensity effect of steel；But too high levels can be to plasticity and toughness, corrosion resistance
Energy etc. is unfavorable, therefore controlling content is 0.08~0.10%.
Si can play the role of refining crystal grain, be conducive to the toughness for improving steel；But too high levels will lead to welding performance
Decline, therefore controlling content is 0.25~0.30%.
Mn can refine the microscopic structure of steel, be important Strengthening and Toughening element；But too high levels can make steel solderability and
Welding heat influence area toughness deteriorates, therefore controlling content is 1.30~1.50%.
P, S controls its content P≤0.010%, S≤0.010% as objectionable impurities elements respectively.
Ni can significantly improve the corrosion resisting property and low-temperature flexibility of steel, while can effectively prevent that Cu's is hot-short；But cost is too high,
Thus control content is 0.25~0.30%.
Cr can form fine and close oxidation film in steel surface, the corrosion resisting property of steel can be effectively improved, when it is added simultaneously with Cu
When in steel, effect is particularly evident；But the too high welding performance that can deteriorate steel of content, therefore controlling content is 0.45~0.50%.
Cu can effectively improve the corrosion resisting property of steel, but too high levels will lead to the hot-short of steel, therefore controlling content is 0.25
~0.35%.
Al is the deoxidier added in steel, and the Al of micro content is conducive to refine crystal grain, thus control content be 0.02~
0.04%。
Nb can significantly refine crystal grain in steel, improve the intensity of steel, but too high levels will affect toughness, therefore control contains
Amount is 0.020~0.030%.
Ti has the function of crystal grain refinement and precipitation strength in steel, and the intensity and the resistance to punching of low temperature of steel just can be improved in trace Ti
Performance is hit, therefore controls Ti content 0.010~0.020%.
Process design thinking of the present invention:
To guarantee that microalloy element carboritride can be completely dissolved in steel, billet heating temperature is 1200~1250 DEG C,
1~2h of soaking time.
To guarantee that monophase field rolling and deformation and recrystallization softening crystal grain effect, roughing start rolling temperature are 1050~1150
DEG C, 993~1088 DEG C of roughing finishing temperature, single pass reduction ratio is 20~30%, accumulates reduction ratio >=80%.
To guarantee to roll the effect with deformation refinement crystal grain in non-recrystallization zone, finish rolling start rolling temperature is 950~980 DEG C,
Finish rolling finishing temperature is 800~850 DEG C, and single pass reduction ratio is 20~25%.
To obtain soft phase ferrite, hard phase bainite structure, guarantee that steel are high-strength, performance of low yield strength ratio, using laminar flow
Cooling, cooling rate is 15~20 DEG C/s, and red temperature is 610~640 DEG C, and sky is cooled to room temperature again later.
Low yield strength ratio high-strength weathering steel product standard of the present invention refers to GB/T 19879-2015 " steel plate for building structure "；
Product mechanical property detection method canonical reference GB/T 228.1-2010；Product atmospheric corrosion resistance detection method standard ginseng
Examine People's Republic of China (PRC) railroad industry standard TB/T 1979-2014；Weather resistance test experience is all with weathering steel according to railway
Phase immersion test method TB/T 2375-1993.
The beneficial effects of adopting the technical scheme are that the 1, present invention passes through ingredient design and controlled rolling and controlled cooling work
Skill ensure that the corrosion resisting property of steel, obtains ferrite+bainite+pearlitic structrure of fine uniform, improves the tough of steel
Property and shock resistance.2, low yield strength ratio high-strength weathering steel yield strength of the present invention: 428.5~444.3MPa, tensile strength: 663.2
~673.3MPa, yield tensile ratio≤0.66, elongation after fracture >=21%, -40 DEG C of impact of collision function >=66J.3, low yield strength ratio of the present invention
The relatively corrosive rate of high-strength weathering steel 72h alternate-immersion test compared with Q345B≤53%, weather resistance is substantially better than general
Logical carbon steel.
Detailed description of the invention
Fig. 1 is 1 low yield strength ratio high-strength weathering steel metallographic structure figure of embodiment；
Fig. 2 is 2 low yield strength ratio high-strength weathering steel metallographic structure figure of embodiment；
Fig. 3 is 3 low yield strength ratio high-strength weathering steel metallographic structure figure of embodiment；
Fig. 4 is 4 low yield strength ratio high-strength weathering steel metallographic structure figure of embodiment；
Fig. 5 is 5 low yield strength ratio high-strength weathering steel metallographic structure figure of embodiment.
Specific embodiment
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment low yield strength ratio high-strength weathering steel is shown in Table 1 with a thickness of 10mm, chemical component composition and mass percentage.
The production method of the present embodiment low yield strength ratio high-strength weathering steel include smelting, continuous casting, slab heating, controlled rolling,
Cooling process is controlled, specific process step is as described below:
(1) smelt, continuous casting working procedure: molten steel is casting continuously to form slab, slab thickness 150mm after smelting；
(2) slab heating process: 1200 DEG C of slab heating temperature, soaking time 2h；
(3) controlled rolling process: roughing start rolling temperature is 1070 DEG C, roughing single pass reduction ratio is respectively 20.0%, 24.2%,
27.9%, 29.9%, 30.0% and 29.8%, roughing accumulation reduction ratio 84.9%, 1014 DEG C of roughing finishing temperature；Finish rolling start rolling temperature
It is 961 DEG C, finish rolling single pass reduction ratio difference 24.8%, 21.8%, 23.5% and 23.1%, finish rolling finishing temperature is 850 DEG C；
(4) control cooling process: control is cooling to use section cooling, and cooling rate is 15 DEG C/s, and final cooling temperature is 628 DEG C, it
After be air-cooled to room temperature.
The mechanical property of the present embodiment low yield strength ratio high-strength weathering steel is shown in Table 2；It is tied compared with Q345B atmospheric corrosion resistance
Fruit is shown in Table 3.
Fig. 1 is shown in the metallographic structure of the present embodiment low yield strength ratio high-strength weathering steel, and as shown in Figure 1, tissue is ferrite+shellfish
Family name's body+pearlitic structrure.
Embodiment 2
The present embodiment low yield strength ratio high-strength weathering steel is shown in Table 1 with a thickness of 6mm, chemical component composition and mass percentage.
The production method of the present embodiment low yield strength ratio high-strength weathering steel include smelting, continuous casting, slab heating, controlled rolling,
Cooling process is controlled, specific process step is as described below:
(1) smelt, continuous casting working procedure: molten steel is casting continuously to form slab, slab thickness 150mm after smelting；
(2) slab heating process: 1250 DEG C of slab heating temperature, soaking time 2h；
(3) controlled rolling process: roughing start rolling temperature is 1150 DEG C, roughing single pass reduction ratio is respectively 20.0%, 23.3%,
27.2%, 28.4%, 29.2% and 29.4%, roughing accumulation reduction ratio 84.0%, 1088 DEG C of roughing finishing temperature；Finish rolling start rolling temperature
It is 980 DEG C, finish rolling single pass reduction ratio is respectively 24.2%, 24.7%, 25.0% and 23.1%, and finish rolling finishing temperature is 800 DEG C；
(4) control cooling process: control is cooling to use section cooling, and cooling rate is 20 DEG C/s, and final cooling temperature is 614 DEG C, it
After be air-cooled to room temperature.
The mechanical property of the present embodiment low yield strength ratio high-strength weathering steel is shown in Table 2；It is tied compared with Q345B atmospheric corrosion resistance
Fruit is shown in Table 3.
Fig. 2 is shown in the metallographic structure of the present embodiment low yield strength ratio high-strength weathering steel, and as shown in Figure 2, tissue is ferrite+shellfish
Family name's body+pearlitic structrure.
Embodiment 3
The present embodiment low yield strength ratio high-strength weathering steel is shown in Table 1 with a thickness of 12mm, chemical component composition and mass percentage.
The production method of the present embodiment low yield strength ratio high-strength weathering steel include smelting, continuous casting, slab heating, controlled rolling,
Cooling process is controlled, specific process step is as described below:
(1) smelt, continuous casting working procedure: molten steel is casting continuously to form slab, slab thickness 150mm after smelting；
(2) slab heating process: 1200 DEG C of slab heating temperature, soaking time 1h；
(3) controlled rolling process: roughing start rolling temperature is 1050 DEG C, roughing single pass reduction ratio is respectively 20.0%, 23.3%,
27.2%, 28.4%, 29.2% and 29.4%, roughing accumulation reduction ratio 84.0%, 993 DEG C of roughing finishing temperature；Finish rolling start rolling temperature is
950 DEG C, finish rolling single pass reduction ratio is respectively 20.8%, 21.1%, 24.3% and 20.0%, and finish rolling finishing temperature is 846 DEG C；
(4) control cooling process: control is cooling to use section cooling, and cooling rate is 16 DEG C/s, and final cooling temperature is 632 DEG C, it
After be air-cooled to room temperature.
The mechanical property of the present embodiment low yield strength ratio high-strength weathering steel is shown in Table 2；It is tied compared with Q345B atmospheric corrosion resistance
Fruit is shown in Table 3.
Fig. 3 is shown in the metallographic structure of the present embodiment low yield strength ratio high-strength weathering steel, from the figure 3, it may be seen that its tissue is ferrite+shellfish
Family name's body+pearlitic structrure.
Embodiment 4
The present embodiment low yield strength ratio high-strength weathering steel is shown in Table 1 with a thickness of 8mm, chemical component composition and mass percentage.
The production method of the present embodiment low yield strength ratio high-strength weathering steel include smelting, continuous casting, slab heating, controlled rolling,
Cooling process is controlled, specific process step is as described below:
(1) smelt, continuous casting working procedure: molten steel is casting continuously to form slab, slab thickness 150mm after smelting；
(2) slab heating process: 1220 DEG C of slab heating temperature, soaking time 2h；
(3) controlled rolling process: roughing start rolling temperature is 1087 DEG C, roughing single pass reduction ratio is respectively 20.0%, 23.3%,
27.2%, 28.4%, 29.2% and 29.4%, roughing accumulation reduction ratio 84.0%, 1031 DEG C of roughing finishing temperature；Finish rolling start rolling temperature
It is 970 DEG C, finish rolling single pass reduction ratio is respectively 24.2%, 24.7%, 24.8% and 22.3%, and finish rolling finishing temperature is 819 DEG C；
(4) control cooling process: control is cooling to use section cooling, and cooling rate is 18 DEG C/s, and final cooling temperature is 610 DEG C, it
After be air-cooled to room temperature.
The mechanical property of the present embodiment low yield strength ratio high-strength weathering steel is shown in Table 2；It is tied compared with Q345B atmospheric corrosion resistance
Fruit is shown in Table 3.
Fig. 4 is shown in the metallographic structure of the present embodiment low yield strength ratio high-strength weathering steel, and as shown in Figure 4, tissue is ferrite+shellfish
Family name's body+pearlitic structrure.
Embodiment 5
The present embodiment low yield strength ratio high-strength weathering steel is shown in Table 1 with a thickness of 9mm, chemical component composition and mass percentage.
The production method of the present embodiment low yield strength ratio high-strength weathering steel include smelting, continuous casting, slab heating, controlled rolling,
Cooling process is controlled, specific process step is as described below:
(1) smelt, continuous casting working procedure: molten steel is casting continuously to form slab, slab thickness 150mm after smelting；
(2) slab heating process: 1250 DEG C of slab heating temperature, soaking time 1h；
(3) controlled rolling process: roughing start rolling temperature is 1122 DEG C, roughing single pass reduction ratio is respectively 20.0%, 23.3%,
23.9%, 24.3%, 24.5% and 25.0%, roughing accumulation reduction ratio 80%, 1052 DEG C of roughing finishing temperature；Finish rolling start rolling temperature is
964 DEG C, finish rolling single pass reduction ratio is respectively 20.0%, 20.8%, 22.6%, 23.1% and 20.4%, finish rolling finishing temperature 825
℃；
(4) control cooling process: control is cooling to use section cooling, and cooling rate is 17 DEG C/s, and final cooling temperature is 640 DEG C, it
After be air-cooled to room temperature.
The mechanical property of the present embodiment low yield strength ratio high-strength weathering steel is shown in Table 2；It is tied compared with Q345B atmospheric corrosion resistance
Fruit is shown in Table 3.
Fig. 5 is shown in the metallographic structure of the present embodiment low yield strength ratio high-strength weathering steel, and as shown in Figure 5, tissue is ferrite+shellfish
Family name's body+pearlitic structrure.
The chemical component of 1 embodiment 1-5 low yield strength ratio high-strength weathering steel of table forms and content (%)
The mechanical property of 2 embodiment 1-5 low yield strength ratio high-strength weathering steel of table
3 embodiment 1-5 low yield strength ratio high-strength weathering steel atmospheric corrosion resistance test result of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (8)
1. a kind of low yield strength ratio high-strength weathering steel, which is characterized in that the weather-proof steel chemical composition composition and its quality percentage contain
Amount are as follows: C:0.08~0.10%, Si:0.25~0.30%, Mn:1.30~1.50%, P≤0.010%, S≤0.010%, Ni:0.25
~0.30%, Cr:0.45~0.50%, Cu:0.25~0.35%, Al:0.02~0.04%, Nb:0.020~0.030%, Ti:
0.010~0.020%, surplus is Fe and inevitable impurity element.
2. a kind of low yield strength ratio high-strength weathering steel according to claim 1, which is characterized in that the weathering steel is with a thickness of 6
~12mm；Weather-proof structure of steel is ferrite+bainite+pearlitic structrure.
3. a kind of low yield strength ratio high-strength weathering steel according to claim 1, which is characterized in that the weather-proof Steel Properties are bent
Intensity: 428.5~444.3MPa is taken, tensile strength: 663.2~673.3MPa, yield tensile ratio≤0.66, elongation after fracture >=
21%, -40 DEG C of impact of collision function >=66J.
4. based on a kind of production method of low yield strength ratio high-strength weathering steel described in claim 1-3 any one, feature exists
In the production method includes smelting, continuous casting, slab heating, controlled rolling, control cooling process；The controlled rolling process,
Roughing start rolling temperature is 1050~1150 DEG C, and roughing single pass reduction ratio is 20~30%, and finish rolling start rolling temperature is 950~980
DEG C, finish rolling single pass reduction ratio is 20~25%；The control cooling process, cooling rate are 15~20 DEG C/s, and final cooling temperature is
610~640 DEG C.
5. a kind of production method of low yield strength ratio high-strength weathering steel according to claim 4, which is characterized in that the slab
Heating process, 1200~1250 DEG C of slab heating temperature, 1~2h of soaking time.
6. a kind of production method of low yield strength ratio high-strength weathering steel according to claim 4, which is characterized in that the control
Rolling process, roughing start rolling temperature are 1050~1150 DEG C, and roughing single pass reduction ratio is 20~30%, and reduction ratio is accumulated in roughing
>=80%, 993~1088 DEG C of roughing finishing temperature.
7. a kind of production method of low yield strength ratio high-strength weathering steel, feature according to claim 4-6 any one exist
In the controlled rolling process, finish rolling start rolling temperature is 950~980 DEG C, and finish rolling single pass reduction ratio is 20~25%, and finish rolling is whole
Rolling temperature is 800~850 DEG C.
8. a kind of production method of low yield strength ratio high-strength weathering steel, feature according to claim 4-6 any one exist
In, the control cooling process, control is cooling to use section cooling, and cooling rate is 15~20 DEG C/s, and final cooling temperature is 610~
640 DEG C, it is air-cooled to room temperature later.
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| CN111235472A (en) * | 2019-12-16 | 2020-06-05 | 首钢集团有限公司 | 420 MPa-grade low-alloy corrosion-resistant steel and preparation method and application thereof |
| CN112176259A (en) * | 2020-10-14 | 2021-01-05 | 邯郸钢铁集团有限责任公司 | 550 Mpa-grade high-strength weathering steel and production method thereof |
| CN112522620A (en) * | 2019-11-28 | 2021-03-19 | 新余钢铁股份有限公司 | Method for preparing weather-resistant bridge steel plates of different grades under same steel components |
| CN113846269A (en) * | 2021-09-29 | 2021-12-28 | 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 |
| CN114058973A (en) * | 2021-11-02 | 2022-02-18 | 河钢股份有限公司 | NM 450-grade low-carbon low-alloy bainite wear-resistant steel and preparation method thereof |
| CN114737124A (en) * | 2022-04-20 | 2022-07-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-yield-ratio and low-cost weathering steel and production method thereof |
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| CN112522620B (en) * | 2019-11-28 | 2022-04-19 | 新余钢铁股份有限公司 | Method for preparing weather-resistant bridge steel plates of different grades under same steel components |
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| CN114058973A (en) * | 2021-11-02 | 2022-02-18 | 河钢股份有限公司 | NM 450-grade low-carbon low-alloy bainite wear-resistant steel and preparation method thereof |
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