CN107326304A - A kind of TMCP types surrender 500MPa grades of bridge steel plates and production method - Google Patents
A kind of TMCP types surrender 500MPa grades of bridge steel plates and production method Download PDFInfo
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- CN107326304A CN107326304A CN201710480911.2A CN201710480911A CN107326304A CN 107326304 A CN107326304 A CN 107326304A CN 201710480911 A CN201710480911 A CN 201710480911A CN 107326304 A CN107326304 A CN 107326304A
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C22C38/44—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
- C22C38/46—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
-
- 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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- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention discloses a kind of TMCP types and surrenders 500MPa grades of bridge steel plates and production method, and steel plate chemical composition composition and weight/mass percentage composition are：C：0.06 0.08%, Si：0.2 0.4%, Mn：1.45 1.55%, P≤0.01%, S≤0.002%, Nb：0.045 0.055%, V：0.035 0.045%, Ni：0.18 0.25%, Cr：0.20 0.25%, Mo：0.15 0.2%, Cu：0.15 0.2%, Alt：0.02~0.04%, surplus is Fe and inevitable impurity；Production method includes heating, rolling, cooling, tempering process.Steel plate yield strength >=500MPa of the present invention, tensile strength all >=630MPa, yield tensile ratio≤0.85,40 DEG C ballistic work >=120J, steel plate maximum gauge can reach 80mm.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of TMCP types surrender 500MPa grades of bridge steel plates and producer
Method.
Background technology
At present, it is domestic to lead to bridge, Pingtan bridge in the Shanghai built and the Wufeng Mount bridge project of construction be started, represent
The highest level of domestic bridge manufacture, its design side is middle iron bridge innings group.In recent years, the dragon that bridge is manufactured at home
In head enterprise under the common promotion of iron Shanhai Pass bridge factory and University On The Mountain Of Swallows, the condition of delivery of bridge steel is energetically to the TMCP easily welded
Type transition, this also represent the developing direction of Bridges in Our Country steel.
The GB714-2015 of newest promulgation is by thermo-mechanical rolling（TMCP or TMCP+ tempering）The bridge composition of steel of delivery is independent
List, carbon content, carbon equivalent, weld crack Sensitivity Index are limited to lower value, intensity, quality scale arrive for Q345qC
Q500qF.All strength grade bridge Impact Toughness of Steel averages are promoted to more than 120J simultaneously, and yield tensile ratio is not higher than into 0.85
As recommendation, good profile is also by as the importance for weighing product quality.Required according to the Bridge Design of latest domestic,
370MPa, 420MPa and 500MPa are surrendered by as the primary intensity rank used.370MPa will turn into main flow, and key position will
Using 420MPa grades, part large bridge will use 500MPa grades.
The content of the invention
500MPa grades of bridge steel plates are surrendered the technical problem to be solved in the present invention is to provide a kind of TMCP types；The present invention is also carried
A kind of TMCP types have been supplied to surrender the production method of 500MPa grades of bridge steel plates.
In order to solve the above technical problems, the present invention is adopted the technical scheme that：A kind of TMCP types surrender 500MPa grades of bridges
Steel plate, the steel plate chemical composition composition and weight/mass percentage composition are：C：0.06-0.08%, Si：0.20-0.40%, Mn：1.45-
1.55%, P≤0.010%, S≤0.002%, Nb：0.045-0.055%, V：0.035-0.045%, Ni：0.18-0.25%, Cr：
0.20-0.25%, Mo：0.15-0.20%, Cu：0.15-0.20%, Alt：0.020~0.040%, surplus is Fe and inevitable
Impurity.
Carbon equivalent of the present invention is 0.40~0.46%, and steel plate is organized as ferrite+granular bainite+lath bayesian
The complex tissue of body.
Steel plate steel plate maximum gauge of the present invention can reach 70mm.
Steel plate yield strength >=500MPa of the present invention, tensile strength >=630MPa, yield tensile ratio≤0.85, -40 DEG C of punchings
Hit work(>=120J.
Present invention also offers the production method that a kind of TMCP types surrender 500MPa grades of bridge steel plates, methods described includes adding
Heat, rolling, cooling, tempering process；The rolling process uses recrystallization zone+Unhydrated cement two benches controlled rolling process.
Heating process of the present invention, 1240-1250 DEG C of the maximum heating temperature of steel billet, 1200-1220 DEG C of soaking temperature,
Total heat time >=330min, soaking zone time inside furnace >=60min.
Rolling process of the present invention, using recrystallization zone+Unhydrated cement two benches controlled rolling process, the first stage rolls
Temperature processed is 1000~1100 DEG C, and single pass rolling reduction is 10~20%, and it is 30~50% to add up reduction ratio.
Rolling process of the present invention, second stage rolling temperature is 850~880 DEG C, and it is 30~50% to add up reduction ratio.
Refrigerating work procedure of the present invention, uses ACC water coolings after rolling, it is 800-820 DEG C to enter coolant-temperature gage, and red temperature 500~
550℃。
Tempering process of the present invention, 500-550 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mentality of designing of the present invention and method is as follows：Carbon, manganese solution strengthening；Add appropriate Nb, V, Ni, Cr, Mo, Cu thin
Change crystal grain, its carbonitride plays dispersion-strengthened action；By subsequently accurately controlled rolling and controlled cooling and sample hardening and tempering process, make steel plate
With good mechanical property.Wherein, the effect of each component and content in the present invention is：
C：Carbon makes a significant impact on the surrender of steel, tensile strength, welding performance, and carbon can significantly improve steel plate by gap solid solution
Intensity, but carbon content is too high, and the welding performance and toughness of steel can be influenceed again.
Si：As reducing agent and deoxidier in steelmaking process, while Si can also play solution strengthening effect, but exceed
When 0.5%, the toughness of steel can be caused to decline, reduce the welding performance of steel.
Mn：Manganese is with low cost, can increase the toughness, intensity and hardness of steel, improves the quenching degree of steel, improves the hot-working of steel
Performance；Manganese amount is too high, center segregation easily occurs for big thickness steel plate.
P、S：In general, p and ses are all harmful elements in steel, increase the fragility of steel；Phosphorus becomes welding performance
It is bad, reduce plasticity；Sulphur reduces the ductility and toughness of steel, and crackle is caused in rolling；Therefore reduction p and ses should be tried one's best in steel
In content.
Al：Aluminium is to add a small amount of aluminium in the deoxidier commonly used in steel, steel, can crystal grain thinning, improve impact flexibility；Aluminium is also
It is too high then to influence hot-working character, welding performance and the machinability of steel with inoxidizability and corrosion resistance.
Nb：In order to promote the crystal grain refinement of steel rolling microscopic structure, intensity and toughness can be improved simultaneously, and niobium can be in controlled rolling
By suppressing austenite recrystallization, effective refinement microstructure in journey, and pass through precipitation strength matrix；In welding process, niobium
The segregation of atom and precipitation can hinder the roughening of austenite crystal during heating, and ensure to obtain relatively fine hot shadow after welding
Ring district's groups to knit, improving welding property.
V：Main function is the alternate precipitation in γ-α transition processes and the precipitation strength in ferrite.
Ni：Main function is to ensure steel plate low-temperature flexibility.
Cr：Quenching degree and solution strengthening can be improved, it is possible to increase intensity and hardness of the steel under condition of heat treatment；But also make
Steel plate toughness decreases, and increases temper brittleness, therefore can be required according to obdurability, it is determined that rational Cr contents, according to
The obdurability of steel requires that different additions are different.
Mo：Main function improves temper resistance, significantly improves the elevated temperature strength of steel.
Cu：It is the element often added in low-carbon bainite steel, Cu is added in big thick and high-strength degree steel to be significantly improved
Because of low-carbon, roll reduction is not enough, roll caused by the low factor of rear cooling rate the thick thick bayesian brought of austenite crystal in steel
Body is so that after the tempering of intensity decreases phenomenon, especially steel plate, have stronger precipitation strength effect, in order to prevent copper in cyrystal boundary segregation
Cause strand and steel plate to ftracture, typically add a certain amount of nickel.
TMCP types of the present invention surrender 500MPa grades of bridge steel plate product standards and refer to GB/T 714-2015.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the Design of Chemical Composition of steel plate of the present invention is using low
C, it is ensured that the good weldability of steel plate；Designed using Nb, V microalloying, being aided with the alloying elements such as Mo ensures armor plate strength, toughness
Matching and resistance to elevated temperatures.2nd, steel plate of the present invention has good cryogenic property, and iron is obtained using controlled rolling and controlled cooling+tempering process skill
The complex tissue of ferritic+granular bainite+ferrite bainite.3rd, there is 500MPa grades of Q500qE steel plates of the present invention surrender low-carbon to work as
Amount and the features such as crack-sensitivity sex index, low yield strength ratio, low temperature rush good-toughness, weldability is good, Ceq：0.40~0.46%；
Steel plate yield strength >=500MPa of the present invention, tensile strength >=630MPa, yield tensile ratio≤0.85, -40 DEG C of ballistic works >=
120J, steel plate maximum gauge can reach 70mm.
Brief description of the drawings
Fig. 1 is the micro-organization chart of the steel plate of embodiment 1；
Fig. 2 is the micro-organization chart of the steel plate of embodiment 2；
Fig. 3 is the micro-organization chart of the steel plate of embodiment 3；
Fig. 4 is the micro-organization chart of the steel plate of embodiment 4；
Fig. 5 is the micro-organization chart of the steel plate of embodiment 5；
Fig. 6 is the micro-organization chart of the steel plate of embodiment 6.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
TMCP types are surrendered 500MPa grades of bridge steel plates and produced using following methods：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 4-5m/t steel during refining；Molten steel
Temperature reaches that 1530-1550 DEG C is transferred to before VD stove Fruit storages, Fruit storage and adds CaSi blocks >=1.0kg/t steel and change
Become inclusion morphology, vacuum≤66.6Pa of Fruit storage, vacuum retention time >=20min；Tap molten steel chemistry into
It is grouped into and weight/mass percentage composition is：C：0.06-0.08%, Si：0.20-0.40%, Mn：1.45-1.55%, P≤0.010%, S≤
0.002%, Nb：0.045-0.055%, V：0.035-0.045%, Ni：0.18-0.25, Cr：0.20-0.25%, Mo：0.15-
0.20%, Cu：0.15-0.20%, Alt：0.020~0.040%, surplus is Fe and inevitable impurity.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1240~1250 DEG C of the maximum heating temperature of steel billet, 1200-1220 DEG C of soaking temperature, total heating
Time >=330min, soaking zone time inside furnace >=60min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1000~1100 DEG C, and this stage single pass rolling reduction is 10~20%, and accumulative reduction ratio is
30~50%；Second stage rolling temperature is 850~880 DEG C, and it is 30~50% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 800-820 DEG C of coolant-temperature gage, 500~550 DEG C of red temperature.
（6）Tempering process：500-550 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
Embodiment 1
It is 20mm, its chemical composition composition and weight/mass percentage composition that the present embodiment TMCP types, which surrender 500MPa grades of bridge steel plate thickness,
It is shown in Table 1.
The present embodiment TMCP types surrender 500MPa grade bridge steel plates production method including smelting, continuous casting, heating, rolling,
Cooling, tempering process, concrete technology step are as described below：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 5m/t steel during refining；Molten steel temperature
Degree reaches that 1540 DEG C are transferred to addition CaSi block 1.2kg/t steel change field trash before VD stove Fruit storages, Fruit storage
Form, the vacuum 66.6Pa of Fruit storage, vacuum retention time 20min；Ladle chemistry of tapping is constituted and quality
Percentage composition is shown in Table 1.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1250 DEG C of the maximum heating temperature of steel billet, 1220 DEG C of soaking temperature, total heat time 331min,
Soaking zone time inside furnace 63min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1030 DEG C, and this stage single pass rolling reduction is 20%, and it is 50% to add up reduction ratio；Second-order
Section rolling temperature is 850 DEG C, and it is 30% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 810 DEG C of coolant-temperature gage, 510 DEG C of red temperature.
（6）Tempering process：511 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mechanical property of bridge steel plate obtained by the present embodiment：Yield strength 535MPa, tensile strength 652MPa, yield tensile ratio
0.82, the average 268J of -40 DEG C of ballistic works；Fig. 1 sees in micro-organization chart, as seen from Figure 1 its be organized as ferrite+granular bainite+
The complex tissue of ferrite bainite.
Embodiment 2
It is 30mm, its chemical composition composition and weight/mass percentage composition that the present embodiment TMCP types, which surrender 500MPa grades of bridge steel plate thickness,
It is shown in Table 1.
The present embodiment TMCP types surrender 500MPa grade bridge steel plates production method including smelting, continuous casting, heating, rolling,
Cooling, tempering process, concrete technology step are as described below：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 4m/t steel during refining；Molten steel temperature
Degree reaches that 1535 DEG C are transferred to addition CaSi block 1.0kg/t steel change field trash before VD stove Fruit storages, Fruit storage
Form, the vacuum 66.6Pa of Fruit storage, vacuum retention time 22min；Ladle chemistry of tapping is constituted and quality
Percentage composition is shown in Table 1.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1242 DEG C of the maximum heating temperature of steel billet, 1205 DEG C of soaking temperature, total heat time 335min,
Soaking zone time inside furnace 62min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1020 DEG C, and this stage single pass rolling reduction is 12%, and it is 33% to add up reduction ratio；Second-order
Section rolling temperature is 860 DEG C, and it is 37% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 820 DEG C of coolant-temperature gage, 520 DEG C of red temperature.
（6）Tempering process：521 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mechanical property of bridge steel plate obtained by the present embodiment：Yield strength 545MPa, tensile strength 662MPa, yield tensile ratio
0.82, the average 258J of -40 DEG C of ballistic works；Fig. 2 sees in micro-organization chart, as seen from Figure 2 its be organized as ferrite+granular bainite+
The complex tissue of ferrite bainite.
Embodiment 3
It is 40mm, its chemical composition composition and weight/mass percentage composition that the present embodiment TMCP types, which surrender 500MPa grades of bridge steel plate thickness,
It is shown in Table 1.
The present embodiment TMCP types surrender 500MPa grade bridge steel plates production method including smelting, continuous casting, heating, rolling,
Cooling, tempering process, concrete technology step are as described below：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 4.5m/t steel during refining；Molten steel
Temperature reaches that 1532 DEG C are transferred to before VD stove Fruit storages, Fruit storage to add CaSi block 1.1kg/t steel and change and are mingled with
Thing form, the vacuum 66.6Pa of Fruit storage, vacuum retention time 25min；Ladle chemistry of tapping is constituted and matter
Amount percentage composition is shown in Table 1.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1250 DEG C of the maximum heating temperature of steel billet, 1220 DEG C of soaking temperature, total heat time 338min,
Soaking zone time inside furnace 65min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1040 DEG C, and this stage single pass rolling reduction is 15%, and it is 40% to add up reduction ratio；Second-order
Section rolling temperature is 870 DEG C, and it is 39% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 805 DEG C of coolant-temperature gage, 530 DEG C of red temperature.
（6）Tempering process：531 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mechanical property of bridge steel plate obtained by the present embodiment：Yield strength 555MPa, tensile strength 672MPa, yield tensile ratio
0.83, yield tensile ratio 0.83, the average 248J of -40 DEG C of ballistic works；Fig. 3 sees in micro-organization chart, as seen from Figure 3 its be organized as ferrite+
The complex tissue of granular bainite+ferrite bainite.
Embodiment 4
It is 50mm, its chemical composition composition and weight/mass percentage composition that the present embodiment TMCP types, which surrender 500MPa grades of bridge steel plate thickness,
It is shown in Table 1.
The present embodiment TMCP types surrender 500MPa grade bridge steel plates production method including smelting, continuous casting, heating, rolling,
Cooling, tempering process, concrete technology step are as described below：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 4m/t steel during refining；Molten steel temperature
Degree reaches that 1545 DEG C are transferred to addition CaSi block 1.2m/t steel change field trash shape before VD stove Fruit storages, Fruit storage
State, the vacuum 66.6Pa of Fruit storage, vacuum retention time 30min；Ladle chemistry of tapping is constituted and quality hundred
Point content is shown in Table 1.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1246 DEG C of the maximum heating temperature of steel billet, 1212 DEG C of soaking temperature, total heat time 345min,
Soaking zone time inside furnace 67min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1050 DEG C, and this stage single pass rolling reduction is 17%, and it is 45% to add up reduction ratio；Second-order
Section rolling temperature is 865 DEG C, and it is 40% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 811 DEG C of coolant-temperature gage, 525 DEG C of red temperature.
（6）Tempering process：535 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mechanical property of bridge steel plate obtained by the present embodiment：Yield strength 515MPa, tensile strength 642MPa, yield tensile ratio
0.80, the average 227J of -40 DEG C of ballistic works；Fig. 4 sees in micro-organization chart, as seen from Figure 4 its be organized as ferrite+granular bainite+
The complex tissue of ferrite bainite.
Embodiment 5
It is 60mm, its chemical composition composition and weight/mass percentage composition that the present embodiment TMCP types, which surrender 500MPa grades of bridge steel plate thickness,
It is shown in Table 1.
The present embodiment TMCP types surrender 500MPa grade bridge steel plates production method including smelting, continuous casting, heating, rolling,
Cooling, tempering process, concrete technology step are as described below：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 4.5m/t steel during refining；Molten steel
Temperature reaches that 1530 DEG C are transferred to before VD stove Fruit storages, Fruit storage to add CaSi block 1.1kg/t steel and change and are mingled with
Thing form, the vacuum 66.6Pa of Fruit storage, vacuum retention time 20min；Ladle chemistry of tapping is constituted and matter
Amount percentage composition is shown in Table 1.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1240 DEG C of the maximum heating temperature of steel billet, 1200 DEG C of soaking temperature, total heat time 330min,
Soaking zone time inside furnace 60min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1000 DEG C, and this stage single pass rolling reduction is 10%, and it is 30% to add up reduction ratio；Second-order
Section rolling temperature is 850 DEG C, and it is 30% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 800 DEG C of coolant-temperature gage, 500 DEG C of red temperature.
（6）Tempering process：550 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mechanical property of bridge steel plate obtained by the present embodiment：Yield strength 520MPa, tensile strength 649MPa, yield tensile ratio
0.80, the average 297J of -40 DEG C of ballistic works；Fig. 5 sees in micro-organization chart, as seen from Figure 5 its be organized as ferrite+granular bainite+
The complex tissue of ferrite bainite.
Embodiment 6
It is 80mm, its chemical composition composition and weight/mass percentage composition that the present embodiment TMCP types, which surrender 500MPa grades of bridge steel plate thickness,
It is shown in Table 1.
The present embodiment TMCP types surrender 500MPa grade bridge steel plates production method including smelting, continuous casting, heating, rolling,
Cooling, tempering process, concrete technology step are as described below：
（1）Smelting procedure：Molten steel is first through electric furnace smelting, and feeding LF refining furnace refining feeds Al line 5m/t steel during refining；Molten steel temperature
Degree reaches that 1550 DEG C are transferred to addition CaSi block 1.2m/t steel change field trash shape before VD stove Fruit storages, Fruit storage
State, the vacuum 66.6Pa of Fruit storage, vacuum retention time 25min；Ladle chemistry of tapping is constituted and quality hundred
Point content is shown in Table 1.
（2）Continuous casting working procedure：Become a useful person using 300mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm.
（3）Heating process：1250 DEG C of the maximum heating temperature of steel billet, 1220 DEG C of soaking temperature, total heat time 350min,
Soaking zone time inside furnace 70min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product
Steel plate；First stage rolling temperature is 1100 DEG C, and this stage single pass rolling reduction is 20%, and it is 50% to add up reduction ratio；Second-order
Section rolling temperature is 880 DEG C, and it is 50% to add up reduction ratio.
（5）Refrigerating work procedure：ACC water coolings are used after rolling, enter 820 DEG C of coolant-temperature gage, 550 DEG C of red temperature.
（6）Tempering process：500 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
The mechanical property of bridge steel plate obtained by the present embodiment：Yield strength 545MPa, tensile strength 659MPa, yield tensile ratio
0.83, the average 247J of -40 DEG C of ballistic works；Fig. 6 sees in micro-organization chart, as seen from Figure 6 its be organized as ferrite+granular bainite+
The complex tissue of ferrite bainite.
The embodiment 1-6 light plates chemical composition of table 1 is constituted and weight/mass percentage composition（%）
In table 1, the surplus of chemical composition is Fe and inevitable impurity.
From above-described embodiment, this method production 500MPa grades of high-ductility bridge steel plates of surrender have low carbon equivalent,
The features such as low yield strength ratio, low temperature rush good-toughness, weldability is good.
Above example is only used to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacement, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
Among sharp claimed range.
Claims (10)
1. a kind of TMCP types surrender 500MPa grades of bridge steel plates, it is characterised in that the steel plate chemical composition composition and quality hundred
Point content is：C：0.06-0.08%, Si：0.20-0.40%, Mn：1.45-1.55%, P≤0.010%, S≤0.002%, Nb：
0.045-0.055%, V：0.035-0.045%, Ni：0.18-0.25%, Cr：0.20-0.25%, Mo：0.15-0.20%, Cu：
0.15-0.20%, Alt：0.020~0.040%, surplus is Fe and inevitable impurity.
2. a kind of TMCP types according to claim 1 surrender 500MPa grades of bridge steel plates, it is characterised in that the carbon is worked as
Measure as 0.40~0.46%, the complex tissue for being organized as ferrite+granular bainite+ferrite bainite of steel plate.
3. a kind of TMCP types according to claim 1 surrender 500MPa grades of bridge steel plates, it is characterised in that the steel plate
Steel plate maximum gauge can reach 70mm.
4. a kind of TMCP types according to claim 1 surrender 500MPa grades of bridge steel plates, it is characterised in that the steel plate
Yield strength >=500MPa, tensile strength >=630MPa, yield tensile ratio≤0.85, -40 DEG C of ballistic work >=120J.
5. the production method of 500MPa grades of bridge steel plates is surrendered based on a kind of TMCP types described in claim 1-4 any one,
It is characterized in that, methods described includes heating, rolling, cooling, tempering process；The rolling process is using recrystallization zone+not
Recrystallization zone two benches controlled rolling process.
6. a kind of TMCP types according to claim 5 surrender the production method of 500MPa grades of bridge steel plates, it is characterised in that
The heating process, 1240-1250 DEG C of the maximum heating temperature of steel billet, 1200-1220 DEG C of soaking temperature, total heat time >=
330min, soaking zone time inside furnace >=60min.
7. a kind of TMCP types according to claim 5 surrender the production method of 500MPa grades of bridge steel plates, it is characterised in that
The rolling process, using recrystallization zone+Unhydrated cement two benches controlled rolling process, first stage rolling temperature is 1000~
1100 DEG C, single pass rolling reduction is 10~20%, and it is 30~50% to add up reduction ratio.
8. a kind of TMCP types according to claim 5-7 any one surrender the production method of 500MPa grades of bridge steel plates,
Characterized in that, the rolling process, second stage rolling temperature is 850~880 DEG C, it is 30~50% to add up reduction ratio.
9. a kind of TMCP types according to claim 5-7 any one surrender the production method of 500MPa grades of bridge steel plates,
Characterized in that, the refrigerating work procedure, uses ACC water coolings after rolling, it is 800-820 DEG C, red temperature 500~550 to enter coolant-temperature gage
℃。
10. a kind of TMCP types according to claim 5-7 any one surrender the production method of 500MPa grades of bridge steel plates,
Characterized in that, the tempering process, 500-550 DEG C of heating-up temperature, soaking time coefficient 1.5min/mm.
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| CN109759445A (en) * | 2019-01-25 | 2019-05-17 | 舞阳钢铁有限责任公司 | Control the production method of TMCP shape steel plate performance difference end to end |
| CN110423938A (en) * | 2019-07-24 | 2019-11-08 | 舞阳钢铁有限责任公司 | TMCP type surrenders 500MPa level structure steel plate and its production method |
| CN115807192A (en) * | 2022-12-12 | 2023-03-17 | 湖南华菱湘潭钢铁有限公司 | Low-carbon 420 MPa-level TMCP structural steel and production method thereof |
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