CN105603310B - A kind of low yield strength ratio Q420GJ steel plate for building and its production method - Google Patents
A kind of low yield strength ratio Q420GJ steel plate for building and its production method Download PDFInfo
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- CN105603310B CN105603310B CN201610034182.3A CN201610034182A CN105603310B CN 105603310 B CN105603310 B CN 105603310B CN 201610034182 A CN201610034182 A CN 201610034182A CN 105603310 B CN105603310 B CN 105603310B
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses a kind of low yield strength ratio Q420GJ steel plates for building and its production method, belong to construction(al)steel technical field.Chemical composition is by weight percentage：C：0.06~0.08%, Si:0.35~0.45%, Mn：1.45~1.55%, P≤0.015%, S≤0.010%, Nb：0.035~0.045%, V：0.05~0.06%, Ti：0.01~0.02%, Als：0.020~0.040%, remaining is Fe and impurity.Production method comprises the following steps：Step 1 is smelted, step 2 continuous casting, step 3 heats, step 4 rolls and cooling, step 5 finishing and flaw detection, shorten the production cycle, reduce cost, finished steel plate has good performance, can be applied to the fields such as high level, Super High, factories and miness, pylon, large span and large scale structure engineering construction.
Description
Technical field
Present invention relates particularly to a kind of low yield strength ratio Q420GJ steel plates for building and its production method, belong to construction(al)steel skill
Art field.
Background technology
Steel building has superior shock resistance, green, quick construction is convenient, space availability ratio is high, design model
The many advantages such as unique novelty, turn into the developing direction of building structure in the world.Steel plate for building is mainly used in high level
Building, high-rise building, large span stadiums, airport, railway station, conference and exhibition center, steel-structure factory building and power transmission and transformation high tower
Etc. the large-scale construction engineering that stress is complicated, reliability requirement is higher, it is desirable to which steel plate just has low yield strength ratio, good toughness and modeling
Property, narrow yield point fluctuation range and less thickness effect, anti-lamellar tearing ability (thickness directional properties), good weldability
Can, excellent extension property and low-Cycle Fatigue Characteristics, there is certain fire resistance.
Current domestic same level construction(al)steel patent and document have：
Chinese patent CN1O1343685A disclose " a kind of yield strength for 420MPa grade high-strength construction(al)steels heat at
Reason method ", ingredient percent are：C 0.12~0.18, Si 0.3~0.4%, Mn 1.4~1.5, Nb 0.03~
0.05th, V0.05~0.10, Ti 0.01~0.02, P ＜ 0.015, S ＜ 0.005, remaining be Fe and inevitable impurity.Continuous casting
Base controls cold method after controlled rolling and controlled cooling, normalizing and produces yield strength in 420-440MPa, yield tensile ratio<0.75, -60 DEG C of punchings
Hit work(up to the 120J thick steel plates for building of 45mm.This method and it is confined to 45mm steel plates.
Chinese patent CN101260495A discloses a kind of " system of 590MPa levels low yield ratio low carbon equivalent weight steel plate for building
Make method ", chemical component weight percentage is：C：0.15、Si：0.37、Mn：1.41、P0.014、S≤0.005、Nb：0.031、
V：0.081st, Alt0.029, remaining is Fe and inevitable impurity.After rolling using two-stage control and control cooling, then pass through
After 760-810 DEG C of two-phase section quenching and 500 DEG C of tempering, complex phase group of the metallographic structure for tempered sorbite and granular ferrite is obtained
Knit, tensile strength reaches the construction(al)steel of 590MPa levels.The invention is quenched using two-phase section and tempering process, is limited by production equipment
System, extends the production cycle, while add cost.
The document development and application of Q420GJC steel " skyscraper with " discusses Wuhan Iron and Steel Plant Q420GJC trial-production, chemical composition
For C：0.10~0.18%, Si：0.20~0.45%, Mn：1.30~1.60%, P≤0.015%, S≤0.010%, Nb≤
0.06, V≤0.07, Ti≤0.03, Als：0.015~0.050%, surplus is Fe and inevitable impurity.It is pre- using molten iron
Processing, converter smelting, LF refining, application of vacuum, continuous casting, rolling, cooling, the method for normalizing produce Q420GJC construction(al)steels.
This method weak point is to need normalized treatment, extends the production cycle, while add cost.
The content of the invention
Therefore, it is an object of the present invention to provide a kind of low yield strength ratio, there is good plasticity and toughness and excellent anti-stratiform
Tear resistance, and production cost is relatively low, is not limited by producing equipment, the process-cycle is short, the controllable low yield strength ratio Q420GJ of specification
Steel plate for building, yield strength >=420MPa, yield tensile ratio are less than 0.79, and -40 DEG C of impact of collision work(are more than 34J, its chemical composition
It is by weight percentage：C：0.06~0.08%, Si:0.35~0.45%, Mn：1.45~1.55%, P≤0.015%, S≤
0.010%th, Nb：0.035~0.045%, V：0.05~0.06%, Ti：0.01~0.02%, Als：0.020~0.040%,
Remaining is Fe and inevitable impurity element.
Present invention also offers the processing method of above-mentioned low yield strength ratio Q420GJ steel plates for building, methods described includes following
Step：
Step 1 is smelted：
Whole Argon pattern is used as raw material, bottom-blowing of converter using the molten iron Jing Guo desulfurization pretreatment and high-quality steel scrap,
Terminal hit at first time, cause molten steel nitrogen pick-up because re-blowing to reduce.The further deoxidation of LF ladle refining furnaces, desulfurization, removal are mingled with, adjusted
It is made into point and temperature, strictly controls Argon intensity, Argon curve is formulated according to the principle that early stage is strong, mid-term is weak compared with strong, later stage,
While deoxidation, deep desulfurization, alloying is ensured, secondary oxidation and the nitrogen pick-up of refining process are reduced.RH processes are deep using circulation
Degasification technique, the gas contents such as hydrogen, oxygen, nitrogen are greatly reduced on the premise of ensureing that liquid steel temperature is stable, reduce pernicious gas pair
The adverse effect of steel, the percentage by weight for finally giving molten steel are C：0.06~0.08%, Si:0.35~0.45%, Mn：
1.45~1.55%, P≤0.015%, S≤0.010%, Nb：0.035~0.045%, V：0.05~0.06%, Ti：0.01~
0.02%th, Als：0.020~0.040%, surplus is Fe and inevitable impurity.
Step 2 continuous casting：
Step 3 heats；
Plate slab is heated in heating furnace, fully ensures that plate slab heating-up temperature and soaking time.Heating and temperature control
At 1180 DEG C -1220 DEG C, heat time control ensures the abundant solid solution of alloying element in 200-240min, and board briquette is equal
It is even.
Step 4 rolls and cooling：
Rolling is rolled using two-stage control, i.e. austenite recrystallization area controlled rolling (commonly referred to as rough rolling step) and Ovshinsky
The non-recrystallization zone controlled rolling of body (commonly referred to as finish rolling stage).Increasing pass deformation during roughing, start rolling temperature is 1160~
1200 DEG C, single pass is controlled more than 20% with respect to reduction ratio at least more than two passages, strictly controls during finish rolling each passage to become
Shape amount, finish rolling start rolling temperature≤920 DEG C, open rolling thickness are 1.3-3.0 times of finished product thickness, last percentage pass reduction>10%.Finish to gauge temperature
870-880 DEG C of degree, roll rear steel plate and cooled down using control, 570-600 DEG C of final cooling temperature, metallographic structure is that crystal grain is tiny and uniform
Ferrite and pearlite.
Step 5 finishing and flaw detection.
Further, step 2 is specially：
Conticaster is straight circular-arc type continuous casting machine, using solidification end dynamic soft-reduction, electromagnetic agitation and the dynamic of optimization two
Refrigeration technique, by constant temperature, permanent pulling rate technique (0.9-1.1m/min), low overheat casting (15-25 DEG C), mitigate continuous casting billet center
The defects of segregation, center porosity, crackle, oscillation mark, final production go out the thick high-quality continuous casting steel billets of 250mm or 300mm.
Further, step 5 is specially：
Line flaw detection is all carried out after hot rolled steel plate cooling, steel plate keeps drying after flaw detection, for being unable to line flaw detection
Steel plate carries out offline flaw detection, carries out and judges according to non-destructive testing standard JB/T4730.3 regulation, and qualified rank is I grade.
The beneficial effects of the present invention are：A kind of low yield strength ratio Q420GJ steel plates for building of the present invention, by rational
Design of Chemical Composition so that finished steel plate obtains more preferable mechanical property, production method of the invention, is directly rolled using normalizing
System, it is heat-treated without offline normalizing, shortens the production cycle, while also reduce production cost, finished steel plate of the present invention has
Excellent comprehensive mechanical performance.It can be applied to high level, Super High, factories and miness, pylon, large span and large scale structure engineering construction etc.
Field.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the production method of low yield strength ratio Q420GJ steel plates for building of the present invention；
Fig. 2 is the metallographic structure figure at the thickness of 3 steel plate of embodiment 1/2.
Embodiment
The embodiment of the present invention is illustrated below in conjunction with the accompanying drawings：
The low yield strength ratio Q420GJ steel plates for building of the present invention, yield strength >=420MPa, yield tensile ratio are less than 0.79,0 DEG C
Impact of collision work(is more than 34J, and chemical composition is by weight percentage：C：0.06~0.08%, Si:0.35~0.45%, Mn：
1.45~1.55%, P≤0.015%, S≤0.010%, Nb：0.035~0.045%, V：0.05~0.06%, Ti：0.01~
0.02%th, Als：0.020~0.040%, remaining is Fe and impurity.The flow of steel plate processing method is as shown in Figure 1.
Embodiment 1
Raw material molten iron passes through Deep Desulphurization of Hot Metal, converter top and bottom blowing, ladle argon-blown, LF external refinings, RH application of vacuum and
Continuous casting process obtains the 250mm heavy slabs of chemical component weight percentage shown in table 1.1200 DEG C of slab heating temperature, during heating
Between 220min, 1180 DEG C of first stage start rolling temperature, single pass controlled with respect to reduction ratio at least more than two passages 20% with
On, when rolled piece thickness is 60mm, treat that temperature to 910 DEG C, then carries out second stage rolling, finishing temperature 870 on roller-way
DEG C, finished steel plate thickness is 20mm.After rolling terminates, steel plate, which enters, accelerates cooling (ACC) equipment, is cooled down with 5 DEG C/s speed
To 600 DEG C, cold bed cooling after heat is rectified.Line flaw detection and finishing processing are carried out afterwards, finally can obtain steel plate finished product.
Embodiment 2
Embodiment is 1200 DEG C, heat time 213min with embodiment 1, wherein heating-up temperature, first stage rolling
Start rolling temperature is 1180 DEG C, and the start rolling temperature of second stage rolling is 900 DEG C, and rolled piece thickness is 125mm, finishing temperature 876
DEG C, finished steel plate thickness is 50mm.Steel plate cooling velocity is 8 DEG C/s, and final cooling temperature is 580 DEG C.Cold bed cooling after heat is rectified.Afterwards
Flaw detection and finishing processing are carried out, finally can obtain steel plate finished product.
Embodiment 3
Embodiment is with embodiment 1, and using 300mm heavy slabs, wherein heating-up temperature is 1200 DEG C, the heat time
230min, the start rolling temperature of first stage rolling is 1185 DEG C, and the start rolling temperature of second stage rolling is 890 DEG C, rolled piece thickness
For 128mm, finishing temperature is 880 DEG C, and finished steel plate thickness is 80mm.Steel plate cooling velocity is 8 DEG C/s, final cooling temperature 570
℃.Cold bed cooling after heat is rectified.Flaw detection and finishing processing are carried out afterwards, finally can obtain steel plate finished product.The steel plate 1/2 of embodiment 3
Metallographic structure figure at thickness is as shown in Fig. 2 metallographic structure is that crystal grain is tiny and uniform ferrite+pearlitic structrure.
The chemical composition (wt%) of embodiment 1~3 is as shown in table 1.
Table 1
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Als |
| 1 | 0.06 | 0.35 | 1.45 | 0.006 | 0.003 | 0.035 | 0.050 | 0.010 | 0.020 |
| 2 | 0.07 | 0.40 | 1.50 | 0.010 | 0.005 | 0.040 | 0.055 | 0.015 | 0.030 |
| 3 | 0.08 | 0.45 | 1.55 | 0.012 | 0.006 | 0.045 | 0.060 | 0.020 | 0.040 |
Conventional mechanical property, Z-direction tensile property, impact property inspection are carried out to the steel plate of embodiment 1~3, the results are shown in Table
2。
Table 2
As can be seen from Table 2, steel plate normal tensile property of the present invention complies fully with this rank skyscraper steel plate requirement,
And there is larger surplus capacity, -40 DEG C of impact of collision work(are much larger than the 34J of standard requirement, and Z-direction Tensile fracture shrinkage factor is 47%
More than, Z35 steel plate ranks are fully met, illustrate that steel plate of the present invention has good anti-lamellar tearing ability.Steel plate yield tensile ratio
≤ 0.79, much smaller than the 0.85 of standard requirement, show that steel plate has excellent shock resistance, I grade of steel plate inspection is qualified, in a word,
Steel plate of the present invention has excellent comprehensive mechanical performance.It can be applied to high level, Super High, factories and miness, pylon, large span and large-scale
Structural Engineering etc..
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of production method of low yield strength ratio Q420GJ steel plates for building, it is characterised in that the low yield strength ratio Q420GJ is built
Yield strength >=420MPa with steel plate is built, yield tensile ratio is less than 0.79, and -40 DEG C of impact of collision work(are more than 34J, the low yield strength ratio
The chemical composition of Q420GJ steel plates for building is by weight percentage：C：0.06~0.08%, Si:0.35~0.45%, Mn：
1.45~1.55%, P≤0.015%, S≤0.010%, Nb：0.035~0.045%, V：0.05~0.06%, Ti：0.01~
0.02%th, Als：0.020~0.040%, remaining is Fe and impurity；
It the described method comprises the following steps：
Step 1 is smelted：
Whole Argon pattern, LF steel are used as raw material, bottom-blowing of converter using the molten iron Jing Guo desulfurization pretreatment and high-quality steel scrap
The further deoxidation of bag refining furnace, desulfurization, removal are mingled with, adjusting component and temperature, according to early stage is strong, mid-term compared with it is strong, the later stage is weak
Principle formulates Argon curve, and for RH processes using deep degasification technique is circulated, the percentage by weight for finally giving molten steel is C：0.06~
0.08%th, Si:0.35~0.45%, Mn：1.45~1.55%, P≤0.015%, S≤0.010%, Nb：0.035~
0.045%th, V：0.05~0.06%, Ti：0.01~0.02%, Als：0.020~0.040%, remaining is Fe and impurity；
Step 2 continuous casting：
Step 3 heats；
Plate slab is heated in heating furnace, at 1180 DEG C -1220 DEG C, the heat time controls in 200- heating and temperature control
240min；
Step 4 rolls and cooling：
Rolling is rolled using two-stage control, i.e. the non-recrystallization zone control of the controlled rolling of austenite recrystallization area and austenite is rolled
System, the controlled rolling of austenite recrystallization area are roughing, and the non-recrystallization zone controlled rolling of austenite is finish rolling, start rolling temperature during roughing
For 1160~1200 DEG C, single pass is controlled more than 20% with respect to reduction ratio at least more than two passages, is strictly controlled during finish rolling
Each pass deformation, finish rolling start rolling temperature≤920 DEG C, open rolling thickness are 1.3-3.0 times of finished product thickness, last percentage pass reduction>
10%, 870-880 DEG C of finishing temperature, roll rear steel plate and cooled down using control, 570-600 DEG C of final cooling temperature, obtain crystal grain it is tiny and
Uniform ferrite+pearlitic structrure；
Step 5 finishing and flaw detection.
2. the production method of low yield strength ratio Q420GJ steel plates for building as claimed in claim 1, it is characterised in that methods described
Middle step 2 is specially：
Conticaster is straight circular-arc type continuous casting machine, using solidification end dynamic soft-reduction, electromagnetic agitation and the dynamic secondary cooling of optimization skill
Art, by constant temperature, permanent pulling rate technique, pulling rate 0.9-1.1m/min, final production goes out the thick high-quality continuous casting steel billets of 250mm or 300mm.
3. the production method of low yield strength ratio Q420GJ steel plates for building as claimed in claim 1, it is characterised in that methods described
Middle step 5 is specially：
Line flaw detection is all carried out after hot rolled steel plate cooling, steel plate keeps drying, the steel plate for being unable to line flaw detection after flaw detection
Offline flaw detection is carried out, carries out and judges according to non-destructive testing standard JB/T4730.3 regulation, qualified rank is I grade.
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| CN201610034182.3A CN105603310B (en) | 2016-01-18 | 2016-01-18 | A kind of low yield strength ratio Q420GJ steel plate for building and its production method |
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| CN107604248B (en) * | 2017-08-11 | 2019-06-25 | 江阴兴澄特种钢铁有限公司 | A kind of high intensity Q500GJD quenched and tempered state steel plate for building structure and its manufacturing method |
| CN109483171A (en) * | 2018-12-05 | 2019-03-19 | 西安庄信新材料科技有限公司 | A kind of construction method of titanium building materials |
| CN111118257A (en) * | 2020-01-16 | 2020-05-08 | 包头钢铁（集团）有限责任公司 | Heat treatment method for improving impact toughness of boron-containing thick hydroelectric steel plate core |
| CN112662941B (en) * | 2020-11-13 | 2022-06-10 | 柳州钢铁股份有限公司 | Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
| CN113528966A (en) * | 2021-07-19 | 2021-10-22 | 新疆八一钢铁股份有限公司 | Production method of steel plate with thickness of 50-80mm for building structure |
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| CN101476081A (en) * | 2008-12-26 | 2009-07-08 | 首钢总公司 | 100mm and 400MPa grade high strength special heavy plate and manufacturing method thereof |
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