CN110499466A - Yield strength 550MPa grade nickel-saving type high-strength weathering steel and its production method - Google Patents
Yield strength 550MPa grade nickel-saving type high-strength weathering steel and its production method Download PDFInfo
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- CN110499466A CN110499466A CN201910823463.0A CN201910823463A CN110499466A CN 110499466 A CN110499466 A CN 110499466A CN 201910823463 A CN201910823463 A CN 201910823463A CN 110499466 A CN110499466 A CN 110499466A
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel and its production method, weather-proof steel chemical composition composition and mass percentage are as follows: C:0.11~0.13%, Si:0.15~0.30%, Mn:1.10~1.30%, P≤0.010%, S≤0.010%, Ni:0.09~0.14%, Cr:0.40~0.45%, Cu:0.25~0.35%, Al:0.02~0.04%, Nb:0.02~0.03%, V:0.02~0.03%, surplus are Fe and inevitable impurity element；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, and the weathering steel of acquisition has high-intensitive, good low-temperature flexibility and excellent corrosion resistance, and production economy is feasible, is conducive to promotion and application.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel and
Its production method.
Background technique
Assembling type steel structure building is with its high-strength light, anti-seismic performance is good, short construction period, percentage of usable dwelling area are high and environmental-friendly
Conducive to recycling many advantages, such as and it is very popular, become the Main way of building trade future development.Assembling type steel structure house
It is widely used in developed countries such as America and Europes, but is still in infancy in China at present.Assembled architecture advantage is numerous,
However in its use process, the corrosion and protection of construction material are inevitable, especially in coastal area.As China is assembled
The application and development of formula steel building, the especially rise of the structural constructions such as high level, Super High, large span, are used for material
Material, especially supporting the steel material of its intensity, it is necessary to have higher intensity, longer service life and more useful weather-proof
Performance.However, the yield strength of domestic construction weathering steel is still based on 345MPa grades and 450MPa grades at present, higher intensity
The Eco-power weathering steel of rank is rarely reported.While the requirement in order to guarantee building aseismicity performance, GB 50011-2010 " building
Earthquake resistant design code " (version in 2016) in the basic demand-structural material and construction clause of Aseismic Design, steel are bent strong
Than having following mandatory provision: yield tensile ratio≤0.85, elongation >=20% with elongation percentage.
Patent No. CN 101994064A, CN 102409253A, CN 101792888A, CN 108486466A disclose in the wrong
550MPa grades of weathering steels of intensity and its manufacturing method are taken, however has been all made of the ingredient design of high Cr, Ni content, patent No. CN
101994064A, CN 102409253A, in CN 101792888A Cr elemental range be respectively 2.50~7.0%, 2.15~
4.0%, 2.50~3.50%.Cr content is greatly reduced in CN 108486466A, however Ni content range is 0.15~0.40%, is added
Add a large amount of Cr, Ni element, while increasing and making steel difficulty manufacturing cost is also improved a lot, is unfavorable for high-intensitive resistance to
Wait promotion and application of the steel in building.It is weather-proof that CN 108342662 also discloses a kind of yield strength 550MPa grade high-strength
Steel though using section Ni ingredient design, however is greater than by the yield tensile ratio of patented method high-strength weathering steel obtained
0.90, it is unable to satisfy Seismic Design of Building requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel and its
Production method.The invention is designed by reasonable ingredient and cooling controlling and rolling controlling process, in the lower situation of Ni content, obtains excellent
Weather resistance, be provided simultaneously with superhigh intensity and high tenacity, that is, there is high-intensitive, good low-temperature flexibility and excellent corrosion-resistant
Performance, and production economy is feasible, is conducive to promotion and application, meets modern assembling type steel structure building especially Super High well
The needs of building.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of yield strength 550MPa grade nickel-saving type
High-strength weathering steel, the weather-proof steel chemical composition composition and its mass percentage are as follows: C:0.11~0.13%, Si:0.15~
0.30%, Mn:1.10~1.30%, P≤0.010%, S≤0.010%, Ni:0.09~0.14%, Cr:0.40~0.45%, Cu:
0.25~0.35%, Al:0.02~0.04%, Nb:0.020~0.030%, V:0.020~0.030%, surplus are Fe and can not keep away
The impurity element exempted from.
Weathering steel of the present invention is organized with a thickness of 8~12mm as ferrite+bainite+pearlite heterogeneous structure.
Weather-proof Steel Properties of the present invention: 552~573MPa of yield strength, 698~729MPa of tensile strength, yield tensile ratio <
0.8, elongation after fracture >=24.5%, -40 DEG C of impact of collision function >=78.4J.
The relatively corrosive rate of weathering steel 72h alternate-immersion test of the present invention compared with Q345B≤40%.
The present invention also provides a kind of production method of yield strength 550MPa grade nickel-saving type high-strength weathering steel, the productions
Method includes smelting, continuous casting, slab heating, controlled rolling, control cooling process；The controlled rolling process, finish rolling open rolling temperature
Degree is 870~890 DEG C；The control cooling process, final cooling temperature are 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, 6 passes of roughing, single track
Secondary reduction ratio is 16~35%, roughing accumulation reduction ratio 80~83.3%, 1000~1020 DEG C of roughing finishing temperature.
Controlled rolling process of the present invention, 5 passes of finish rolling, single pass reduction ratio are 15~25%, finish rolling finish to gauge temperature
Degree is 800~830 DEG C.
Control cooling process of the present invention, using section cooling, cooling rate is 15~20 DEG C/s, is air-cooled to after end is cold
Room temperature.
Mentality of designing of the present invention: it for high intensity, low-temperature flexibility and the good corrosion resistance for guaranteeing weathering steel, takes
Following methods:
(1) by reasonable Cu, Cr, Ni Match of elemental composition, while guaranteeing its corrosion resisting property, production cost is reduced, improves warp
Ji benefit；
(2) vacuum metling process control technology is used, P, S content are controlled 0.010% hereinafter, reducing nonmetal inclusion in steel
Object content；
(3) the finish rolling start rolling temperature for using 870~890 DEG C guarantees the effect in the rolling of non-recrystallization zone and deformation refinement crystal grain,
Crystal grain after making phase transformation more refines, to improve the intensity and toughness of the weathering steel；
(4) 610~640 DEG C of final cooling temperatures are used, guarantee that the microscopic structure of the weathering steel is ferrite+bainite+pearlite
Heterogeneous structure, ferrite have good plasticity and toughness, bainite intensity with higher.
Yield strength 550MPa grade nickel-saving type high-strength weathering steel product standard of the present invention " is built with reference to GB/T 19879-2015
Building structure steel plate " and GB 50011-2010 " seismic design provision in building code " (version in 2016)；Product mechanical property detection method
Canonical reference GB/T 228.1-2010；Product atmospheric corrosion resistance detection method canonical reference People's Republic of China (PRC) railway
Professional standard TB/T 1979-2014；Weather resistance test experience is according to railway weathering steel alternate-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 obtains excellent weatherability, while improving intensity and low-temperature flexibility in the lower situation of Ni content, that is, have it is high-intensitive,
Good low-temperature flexibility and excellent corrosion resistance, and production economy is feasible, is conducive to promotion and application, meets well modern
The needs of assembling type steel structure building especially super high-rise building.2, yield strength 550MPa grade nickel-saving type high-strength weathering of the present invention
Steel 552~573MPa of yield strength, 698~729MPa of tensile strength, yield tensile ratio < 0.8, elongation after fracture >=24.5%, -40 DEG C
Impact of collision function >=78.4J.3, yield strength 550MPa grade nickel-saving type high-strength weathering steel 72h alternate-immersion test of the present invention
Relatively corrosive rate compared with Q345B≤40%, weather resistance is substantially better than ordinary carbon steel.
Detailed description of the invention
Fig. 1 is 1 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 2 is 2 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 3 is 3 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 4 is 4 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 5 is 5 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 6 is 6 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 7 is 7 yield strength 550MPa grade nickel-saving type high-strength weathering steel metallographic structure figure of embodiment；
Fig. 8 is 8 yield strength 550MPa grade nickel-saving type 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 yield strength 550MPa grade nickel-saving type high-strength weathering steel is with a thickness of 8mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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 1150 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
16.7%, 20%, 25%, 26.7%, 30.9% and 34.2%, roughing accumulation reduction ratio 83.3%, 1015 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 890 DEG C, and 5 passes of finish rolling, single pass reduction ratio are respectively 18%, 24.4%, 22.6%, 20.8%
With 15.8%, finish rolling finishing temperature is 820 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 15 DEG C/s, and final cooling temperature is 635 DEG C, cold rear air-cooled eventually
To room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 1 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, as shown in Figure 1,
Tissue is ferrite+bainite+pearlite heterogeneous structure.
Embodiment 2
The present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is with a thickness of 9.5mm, chemical component composition and quality
Percentage composition is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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 1050 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
16.7%, 20%, 25%, 26.7%, 30.9% and 31.6%, roughing accumulation reduction ratio 82.6%, 1000 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature be 880 DEG C, 5 passes of finish rolling, single pass reduction ratio difference 17.3%, 25.0%, 18.18%,
17.0% and 15.2%, finish rolling finishing temperature is 830 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 20 DEG C/s, and final cooling temperature is 612 DEG C, cold rear air-cooled eventually
To room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 2 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, as shown in Figure 2,
Tissue is ferrite+bainite+pearlite heterogeneous structure.
Embodiment 3
The present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is with a thickness of 12mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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 1090 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
16.7%, 20%, 25%, 26.7%, 29.1% and 23.1%, roughing accumulation reduction ratio 80%, 1009 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 870 DEG C, and 5 passes of finish rolling, single pass reduction ratio distinguish 16.7%, 20%, 15%, 16.4% and
15.5%, finish rolling finishing temperature is 805 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 18 DEG C/s, and final cooling temperature is 624 DEG C, cold rear air-cooled eventually
To room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 3 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, from the figure 3, it may be seen that its
Tissue is ferrite+bainite+pearlite heterogeneous structure.
Embodiment 4
The yield strength 550MPa grade nickel-saving type high-strength weathering steel of the present embodiment is with a thickness of 10mm, chemical component composition and quality
Percentage composition is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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: 1230 DEG C of slab heating temperature, soaking time 1.2h；
(3) controlled rolling process: roughing start rolling temperature is 1120 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
17.7%, 18.8%, 22%, 28.7%, 31.9% and 32.2%, roughing accumulation reduction ratio 80.3%, 1010 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 875 DEG C, and 5 passes of finish rolling, single pass reduction ratio distinguish 20%, 20.1%, 21.1%, 20% and
16.7%, finish rolling finishing temperature is 815 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 17 DEG C/s, and final cooling temperature is 615 DEG C, cold rear air-cooled eventually
To room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 4 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, as shown in Figure 4,
Tissue is ferrite+bainite+pearlite heterogeneous structure.
Embodiment 5
The present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is with a thickness of 11mm, chemical component composition and quality hundred
Point content is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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: 1210 DEG C of slab heating temperature, soaking time 1.5h；
(3) controlled rolling process: roughing start rolling temperature is 1100 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
17.0%, 18.2%, 25%, 29.7%, 30.9% and 33.2%, roughing accumulation reduction ratio 81.9%, 1012 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 885 DEG C, 5 passes of finish rolling, single pass reduction ratio difference 15.3%, 15.9%, 15.8%, 18.2
With 18.5%, finish rolling finishing temperature is 825 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 16 DEG C/s, and final cooling temperature is 625 DEG C, cold rear air-cooled eventually
To room temperature.
The mechanical property of the yield strength 550MPa grade nickel-saving type high-strength weathering steel of the present embodiment is shown in Table 2；It is resistance to big with Q345B
Gas corrosion performance comparison result is shown in Table 3.
Fig. 5 is shown in the metallographic structure of the yield strength 550MPa grade nickel-saving type high-strength weathering steel of the present embodiment, as shown in Figure 5,
It organizes to be ferrite+bainite+pearlite heterogeneous structure.
Embodiment 6
The yield strength 550MPa grade nickel-saving type high-strength weathering steel of the present embodiment is with a thickness of 9mm, chemical component composition and quality
Percentage composition is shown in Table 1.
The production method of the yield strength 550MPa grade nickel-saving type high-strength weathering steel of the present embodiment includes smelting, continuous casting, casting
Base heating, controlled rolling, control cooling process, specific process step are 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: 1240 DEG C of slab heating temperature, soaking time 1.8h；
(3) controlled rolling process: roughing start rolling temperature is 1080 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
17.3%, 19.2%, 23%, 32.7%, 30.9% and 31.2%, roughing accumulation reduction ratio 81.2%, 1018 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 878 DEG C, 5 passes of finish rolling, single pass reduction ratio difference 18.4%, 19.6%, 21.6%, 20.7%
With 21.7%, finish rolling finishing temperature is 820 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 19 DEG C/s, and final cooling temperature is 630 DEG C, cold rear air-cooled eventually
To room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 6 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, it will be appreciated from fig. 6 that its
Tissue is ferrite+bainite+pearlite heterogeneous structure.
Embodiment 7
The present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is with a thickness of 10.6mm, chemical component composition and quality
Percentage composition is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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: 1225 DEG C of slab heating temperature, soaking time 1.6h；
(3) controlled rolling process: roughing start rolling temperature is 1130 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
16.0%, 20.2%, 28%, 31.7%, 32.9% and 35.0%, roughing accumulation reduction ratio 83%, 1020 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 887 DEG C, 5 passes of finish rolling, single pass reduction ratio difference 18.6%, 16.3%, 16.7%, 16.7%
With 15.0%, finish rolling finishing temperature is 800 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 17.5 DEG C/s, and final cooling temperature is 610 DEG C, cold rear empty eventually
It is cooled to room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 7 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, as shown in Figure 7,
Tissue is ferrite+bainite+pearlite heterogeneous structure.
Embodiment 8
The present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is with a thickness of 11.5mm, chemical component composition and quality
Percentage composition is shown in Table 1.
The production method of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel includes smelting, continuous casting, slab
Heating, controlled rolling, control cooling process, specific process step are 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: 1245 DEG C of slab heating temperature, soaking time 1.7h；
(3) controlled rolling process: roughing start rolling temperature is 1070 DEG C, and 6 passes of roughing, single pass reduction ratio are respectively
16.1%, 20.5%, 26%, 32.7%, 30.9% and 31.0%, roughing accumulation reduction ratio 80%, 1020 DEG C of roughing finishing temperature；
Finish rolling start rolling temperature is 882 DEG C, 5 passes of finish rolling, single pass reduction ratio difference 18.3%, 20.4%, 15.4%, 17.0%
With 16.1%, finish rolling finishing temperature is 805 DEG C；
(4) control cooling process: using section cooling, and cooling rate is 19.5 DEG C/s, and final cooling temperature is 640 DEG C, cold rear empty eventually
It is cooled to room temperature.
The mechanical property of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel is shown in Table 2；With the resistance to atmosphere of Q345B
Corrosive nature comparison result is shown in Table 3.
Fig. 8 is shown in the metallographic structure of the present embodiment yield strength 550MPa grade nickel-saving type high-strength weathering steel, as shown in Figure 8,
Tissue is ferrite+bainite+pearlite heterogeneous structure.
The chemical component of 1 embodiment 1-8 yield strength 550MPa grade nickel-saving type high-strength weathering steel of table forms and its quality hundred
Divide content (%)
Ingredient surplus is Fe and inevitable impurity element in table 1.
The mechanical property of 2 embodiment 1-8 yield strength 550MPa grade nickel-saving type high-strength weathering steel of table
3 embodiment 1-8 yield strength 550MPa grade nickel-saving type 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 (9)
1. a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel, which is characterized in that the weather-proof steel chemical composition composition
And its mass percentage are as follows: C:0.11~0.13%, Si:0.15~0.30%, Mn:1.10~1.30%, P≤0.010%, S≤
0.010%, Ni:0.09~0.14%, Cr:0.40~0.45%, Cu:0.25~0.35%, Al:0.02~0.04%, Nb:0.020~
0.030%, V:0.020~0.030%, surplus are Fe and inevitable impurity element.
2. a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 1, which is characterized in that described
Weathering steel is organized with a thickness of 8~12mm as ferrite+bainite+pearlite heterogeneous structure.
3. a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 1, which is characterized in that described
Weather-proof Steel Properties: 552~573MPa of yield strength, 698~729MPa of tensile strength, yield tensile ratio < 0.8, elongation after fracture >=
24.5%, -40 DEG C of impact of collision function >=78.4J.
4. a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 1, which is characterized in that described
The relatively corrosive rate of weathering steel 72h alternate-immersion test compared with Q345B≤40%.
5. the production based on a kind of yield strength 550MPa grade nickel-saving type high-strength weathering steel described in claim 1-4 any one
Method, which is characterized in that the production method includes smelting, continuous casting, slab heating, controlled rolling, control cooling process；It is described
Controlled rolling process, finish rolling start rolling temperature are 870~890 DEG C；The control cooling process, final cooling temperature are 610~640 DEG C.
6. a kind of production method of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 5, special
Sign is, the slab heating process, 1200~1250 DEG C of slab heating temperature, 1~2h of soaking time.
7. a kind of production method of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 5, special
Sign is that the controlled rolling process, roughing start rolling temperature is 1050~1150 DEG C, 6 passes of roughing, single pass reduction ratio
It is 16~35%, roughing accumulation reduction ratio 80~83.3%, 1000~1020 DEG C of roughing finishing temperature.
8. a kind of production of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 5-7 any one
Method, which is characterized in that the controlled rolling process, 5 passes of finish rolling, single pass reduction ratio are 15~25%, finish rolling finish to gauge
Temperature is 800~830 DEG C.
9. a kind of production of yield strength 550MPa grade nickel-saving type high-strength weathering steel according to claim 5-7 any one
Method, which is characterized in that the control cooling process, using section cooling, cooling rate is 15~20 DEG C/s, cold rear air-cooled eventually
To room temperature.
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| CN111676429A (en) * | 2020-06-24 | 2020-09-18 | 南京钢铁股份有限公司 | Hot-rolled weather-resistant angle steel with good low-temperature toughness and production method thereof |
| CN112030070A (en) * | 2020-08-18 | 2020-12-04 | 马鞍山钢铁股份有限公司 | 420 MPa-grade hot-rolled H-shaped steel with excellent low-temperature toughness and production 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 |
| CN114381660A (en) * | 2021-12-07 | 2022-04-22 | 唐山中厚板材有限公司 | Galvanizing-free high-strength angle steel and production method thereof |
| CN115094342A (en) * | 2022-06-27 | 2022-09-23 | 宝武集团鄂城钢铁有限公司 | Low-yield-ratio 500MPa weather-resistant bridge steel and preparation method thereof |
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| CN115094342A (en) * | 2022-06-27 | 2022-09-23 | 宝武集团鄂城钢铁有限公司 | Low-yield-ratio 500MPa weather-resistant bridge steel and preparation method thereof |
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