CN107604251A - A kind of low yield strength ratio Q460GJD steel plates and its production method - Google Patents
A kind of low yield strength ratio Q460GJD steel plates and its production method Download PDFInfo
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- CN107604251A CN107604251A CN201710725554.1A CN201710725554A CN107604251A CN 107604251 A CN107604251 A CN 107604251A CN 201710725554 A CN201710725554 A CN 201710725554A CN 107604251 A CN107604251 A CN 107604251A
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Abstract
A kind of low yield strength ratio Q460GJD steel plates and its production method, belong to technical field of steel production.The composition by weight percent composition of the steel plate：C：0.15~0.17%, Si：0.20~0.50%, Mn：1.15~1.25%, P≤0.020%, S≤0.010%, Ti：0.02~0.03%, Nb：0.03~0.04%, Al：0.02~0.05%, surplus is Fe and other inevitable impurity.The production method includes smelting, rolling process, and the rolling process uses two-stage controlled rolling process.The present invention is by rational Design of Chemical Composition, and the TMCP techniques being combined using II types controlled rolling rolling with control cooling, gained steel plate even tissue, stable performance, yield tensile ratio≤0.82, carbon equivalent≤0.41%, yield strength >=470MPa, specific good mechanical property, the market competitiveness are strong.
Description
Technical field
The present invention relates to a kind of low yield strength ratio Q460GJD steel plates and its production method, belong to technical field of steel production.
Background technology
Construction(al)steel is widely used in building field with the advantages that its good reliability, light weight, simple and quick construction, and
Increasing with the fast-developing demand of building trade, the construction(al)steel total amount in China accounts for the 20- of whole output of steels
25%, it has also become the maximum kind of domestic steel consumption.With the fast development of national economy, to the intensity requirement of construction(al)steel
More and more higher, Q460GJ turn into the high-rise, preferred material of high-rise building.
Yield tensile ratio, refer to the yield strength of steel and the ratio of tensile strength, be the important system for weighing steel strength deposit
Number.Generally, when the yield tensile ratio of ferrous materials is relatively low, show that the plasticity of this kind of material is preferable, there is stronger external force resistance impact energy
Power and good welding performance, the reliability of material are also higher.Therefore, to ensure the reliability of ferrous materials, fragility is avoided to break
The generation of thing is split, construction(al)steel clearly requires to yield tensile ratio, and the sheet metal yield tensile ratio of 25mm and following thickness controls
It is relatively difficult.
Therefore, to meet the needs of industry is to steel plate for building structure while solving the problems, such as thin plate yield tensile ratio, exploitation is needed badly
A kind of low yield strength ratio Q460GJD steel plates.
The content of the invention
It is an object of the present invention to provide a kind of low yield strength ratio Q460GJD steel plates；Present invention also offers a kind of low yield strength ratio
The production method of Q460GJD steel plates.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：A kind of low yield strength ratio Q460GJD steel plates, institute
State steel plate chemical composition composition and weight/mass percentage composition be：C：0.15~0.17%, Si：0.20~0.50%, Mn：1.15~
1.25%, P≤0.020%, S≤0.010%, Ti：0.02~0.03%, Nb：0.03~0.04%, Al：0.02~0.05%, surplus
For Fe and other inevitable impurity.
Steel plate thickness of the present invention is 10~25mm.
Steel plate yield tensile ratio≤0.82 of the present invention, carbon equivalent≤0.41%, the MPa of yield strength >=470.
Present invention also offers a kind of production method of low yield strength ratio Q460GJD steel plates, the production method includes smelting,
Rolling process；The rolling process uses two-stage controlled rolling process；In the smelting procedure molten steel chemical composition composition and again
Measuring percentage composition is：C：0.15~0.17%, Si：0.20~0.50%, Mn：1.15~1.25%, P≤0.020%, S≤0.010%,
Ti：0.02~0.03%, Nb：0.03~0.04%, Al：0.02~0.05%, surplus is Fe and other inevitable impurity.
Smelting procedure described in the inventive method is that the molten steel for smelting first furnace is sent into the refining of LF stoves, passes through VD stoves again afterwards
Application of vacuum, then by continuous casting into steel billet.
1270 ± 10 DEG C of maximum heating temperature in heating furnace of rolling process steel billet described in the inventive method, soaking zone temperature
1250 ± 10 DEG C, total heat time is 1~1.2min/mm in heating furnace.
In rolling process described in the inventive method, 1050~1100 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is H+（30
~50）Mm, the H are final steel plate thickness.
In rolling process described in the inventive method, second stage is the austenite non-recrystallization stage, start rolling temperature 850~
900 DEG C, 790~820 DEG C of finishing temperature, rear water cooling is rolled to 670~730 DEG C.
The mentality of designing of the present invention：
The present invention is by rational Design of Chemical Composition, and the TMCP works being combined using II types controlled rolling rolling with control cooling
Skill, solve the problems such as coarse grains are uneven, impact flexibility is low, intensity is uneven caused by common rolling easily, steel plate tool
The good combination property of body.
The effect of wherein micro intensified element Nb, Ti in the present invention is：
Nb：Niobium can promote the crystal grain refinement of steel microscopic structure, while improve intensity and toughness, can pass through suppression in During Controlled Rolling
The effective refinement microstructure of austenite recrystallization, improve mechanical property.
Ti：Titanium and nitrogen, oxygen, carbon have extremely strong affinity, stronger than iron with the affinity of sulphur.Therefore, it is a kind of good
Deoxidation getter and the effective element of fixed nitrogen and carbon.Although titanium is carbide, but other elements connection of getting along well
Conjunction forms complex chemical compound.Titanium carbide adhesion is strong, stable, is not easily decomposed, and carbonization titanium particulate plays the role of to prevent crystal grain from growing up.
Titanium is also one of strong ferrite formation element, the strong A1 and A3 temperature for improving steel.Titanium can carry in ordinary low-alloy steel
High-ductility and toughness.Because titanium secures nitrogen and sulphur and forms titanium carbide, the intensity of steel is improved, precipitation, which forms carbide, to be made
The plasticity and impact flexibility of steel significantly improve, the structural alloy steel of titaniferous, there is good mechanical property and processing performance.
It is using beneficial effect caused by above-mentioned technical proposal：
The low yield strength ratio Q460GJD steel plate Design of Chemical Composition of the present invention is reasonable, even tissue, stable performance, and yield tensile ratio≤
0.82, carbon equivalent≤0.41%, the MPa of yield strength >=470, there is good mechanical property and combination property, comply fully with GB/
The requirement of T19879-2015 standards, while can also meet the requirement that user is low to construction(al)steel yield tensile ratio, yield strength requirement is high,
The market competitiveness is strong.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
Q460GJD steel plate thickness obtained by the present embodiment is 10mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.15%, Si：0.30%, Mn：1.15%, P：0.010%, S：0.002%, Ti：0.02%, Nb：0.030%, Al：0.035%, remaining is
Fe and other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 200mm thickness steel billets.
2）Rolling process：Heating stove heat, 1265 DEG C of maximum heating temperature, 1250 DEG C of soaking temperature are total in heating furnace
Heat time is 220min.Using two-stage controlled rolling process, 1090 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
60mm.870 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 795 DEG C of finishing temperature, rolls rear water cooling to 680
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.8, carbon equivalent 0.360%, the MPa of yield strength 501.
Embodiment 2
Q460GJD steel plate thickness obtained by the present embodiment is 10mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.17%, Si：0.25%, Mn：1.25%, P：0.013%, S：0.006%, Ti：0.025%, Nb：0.035%, Al：0.030%, remaining
For Fe and other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 300mm thickness steel billets.
2）Rolling process：Heating stove heat, 1260 DEG C of maximum heating temperature, 1255 DEG C of soaking temperature are total in heating furnace
Heat time is 300min.Using two-stage controlled rolling process, 1060 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
40mm.900 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 790 DEG C of finishing temperature, rolls rear water cooling to 690
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.81, carbon equivalent 0.402%, the MPa of yield strength 539.
Embodiment 3
Q460GJD steel plate thickness obtained by the present embodiment is 25mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.17%, Si：0.35%, Mn：1.25%, P：0.011%, S：0.003%, Ti：0.028%, Nb：0.030%, Al：0.045%, remaining
For Fe and other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 250mm thickness steel billets.
2）Rolling process：Heating stove heat, 1270 DEG C of maximum heating temperature, 1260 DEG C of soaking temperature are total in heating furnace
Heat time is 260min.Using two-stage controlled rolling process, 1080 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
55mm.860 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 800 DEG C of finishing temperature, rolls rear water cooling to 670
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.77, carbon equivalent 0.397%, yield strength 515MPa.
Embodiment 4
Q460GJD steel plate thickness obtained by the present embodiment is 25mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.15%, Si：0.25%, Mn：1.15%, P：0.012%, S：0.002%, Ti：0.028%, Nb：0.033%, Al：0.025%, remaining
For Fe and other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 220mm thickness steel billets.
2）Rolling process：Heating stove heat, 1272 DEG C of maximum heating temperature, 1255 DEG C of soaking temperature are total in heating furnace
Heat time is 230min.Using two-stage controlled rolling process, 1060 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
75mm.860 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 810 DEG C of finishing temperature, rolls rear water cooling to 685
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.80, carbon equivalent 0.367%, yield strength 496MPa.
Embodiment 5
Q460GJD steel plate thickness obtained by the present embodiment is 20mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.16%, Si：0.20%, Mn：1.20%, P：0.016%, S：0.008%, Ti：0.026%, Nb：0.037%, Al：0.02%, remaining is
Fe and other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 200mm thickness steel billets.
2）Rolling process：Heating stove heat, 1275 DEG C of maximum heating temperature, 1260 DEG C of soaking temperature are total in heating furnace
Heat time is 220min.Using two-stage controlled rolling process, 1100 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
60mm.890 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 806 DEG C of finishing temperature, rolls rear water cooling to 674
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.79, carbon equivalent 0.393%, yield strength 522MPa.
Embodiment 6
Q460GJD steel plate thickness obtained by the present embodiment is 12mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.166%, Si：0.50%, Mn：1.17%, P：0.007%, S：0%, Ti：0.03%, Nb：0.04%, Al：0.04%, remaining be Fe and
Other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 260mm thickness steel billets.
2）Rolling process：Heating stove heat, 1280 DEG C of maximum heating temperature, 1244 DEG C of soaking temperature are total in heating furnace
Heat time is 280min.Using two-stage controlled rolling process, 1070 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
26mm.877 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 820 DEG C of finishing temperature, rolls rear water cooling to 600
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.82, carbon equivalent 0.380%, yield strength 476MPa.
Embodiment 7
Q460GJD steel plate thickness obtained by the present embodiment is 15mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.162%, Si：0.44%, Mn：1.23%, P：0.02%, S：0.01%, Ti：0.03%, Nb：0.032%, Al：0.05%, remaining is Fe
With other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 250mm thickness steel billets.
2）Rolling process：Heating stove heat, 1267 DEG C of maximum heating temperature, 1240 DEG C of soaking temperature are total in heating furnace
Heat time is 290min.Using two-stage controlled rolling process, 1088 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
37mm.893 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 814 DEG C of finishing temperature, rolls rear water cooling to 715
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.74, carbon equivalent 0.377%, yield strength 485MPa.
Embodiment 8
Q460GJD steel plate thickness obtained by the present embodiment is 18mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.157%, Si：0.39%, Mn：1.19%, P：0.003%, S：0.005%, Ti：0.022%, Nb：0.04%, Al：0.047%, remaining
For Fe and other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 200mm thickness steel billets.
2）Rolling process：Heating stove heat, 1266 DEG C of maximum heating temperature, 1258 DEG C of soaking temperature are total in heating furnace
Heat time is 240min.Using two-stage controlled rolling process, 1050 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
28mm.856 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 799 DEG C of finishing temperature, rolls rear water cooling to 730
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.76, carbon equivalent 0.378%, yield strength 551MPa.
Embodiment 9
Q460GJD steel plate thickness obtained by the present embodiment is 23mm, and the chemical composition composition and weight/mass percentage composition of steel plate are：C：
0.165%, Si：0.23%, Mn：1.21%, P：0%, S：0.01%, Ti：0.024%, Nb：0.038%, Al：0.043%, remaining is Fe
With other inevitable impurity.
The production technology of Q460GJD steel plates is as follows obtained by the present embodiment：
1）Steel making working procedure：The molten steel that first furnace is smelted is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then passes through
Continuous casting is into 280mm thickness steel billets.
2）Rolling process：Heating stove heat, 1277 DEG C of maximum heating temperature, 1251 DEG C of soaking temperature are total in heating furnace
Heat time is 325min.Using two-stage controlled rolling process, 1065 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is steel plate thickness
41mm.850 DEG C of second stage start rolling temperature, it is the austenite non-recrystallization stage, 812 DEG C of finishing temperature, rolls rear water cooling to 720
℃。
The mechanical property of gained steel plate：Yield tensile ratio 0.82, carbon equivalent 0.385%, yield strength 508MPa.
Above example is only 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 replacing, 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 (8)
- A kind of 1. low yield strength ratio Q460GJD steel plates, it is characterised in that：The chemical composition composition and weight percentage of the steel plate For：C：0.15~0.17%, Si：0.20~0.50%, Mn：1.15~1.25%, P≤0.020%, S≤0.010%, Ti：0.02~ 0.03%, Nb：0.03~0.04%, Al：0.02~0.05%, surplus is Fe and other inevitable impurity.
- 2. low yield strength ratio Q460GJD steel plates according to claim 1, it is characterised in that：The steel plate thickness be 10~ 25mm。
- 3. low yield strength ratio Q460GJD steel plates according to claim 1 or 2, it is characterised in that the steel plate yield tensile ratio≤ 0.82, carbon equivalent≤0.41%, yield strength >=470MPa.
- 4. based on a kind of production method of low yield strength ratio Q460GJD steel plates described in claim 1-3 any one, its feature exists In the production method includes smelting, rolling process；The rolling process uses two-stage controlled rolling process；The smelting procedure The chemical composition of middle molten steel forms and weight percentage is：C：0.15~0.17%, Si：0.20~0.50%, Mn：1.15~ 1.25%, P≤0.020%, S≤0.010%, Ti：0.02~0.03%, Nb：0.03~0.04%, Al：0.02~0.05%, surplus For Fe and other inevitable impurity.
- 5. the production method of low yield strength ratio Q460GJD steel plates according to claim 4, it is characterised in that：The smelter Sequence is that the molten steel for smelting first furnace is sent into the refining of LF stoves, passes through VD stove applications of vacuum again afterwards, then by continuous casting into Steel billet.
- 6. the production method of low yield strength ratio Q460GJD steel plates according to claim 4, it is characterised in that：The rolling work Sequence steel billet 1270 ± 10 DEG C of maximum heating temperature in heating furnace, 1250 ± 10 DEG C of soaking zone temperature, are always heated in heating furnace Time is 1~1.2min/mm.
- 7. the production method of low yield strength ratio Q460GJD steel plates according to claim 5, it is characterised in that：The rolling work In sequence, 1050~1100 DEG C of first stage start rolling temperature, the steel thickness that dries in the air is H+（30~50）Mm, the H are final steel plate thickness.
- 8. the production method of the low yield strength ratio Q460GJD steel plates according to claim 4-7 any one, it is characterised in that： In the rolling process, 850~900 DEG C of second stage start rolling temperature, 790~820 DEG C of finishing temperature, roll rear water cooling to 670~ 730℃。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797350A (en) * | 2019-02-26 | 2019-05-24 | 南京钢铁股份有限公司 | A kind of Q345 series low-alloy steel Mn content minimizing manufacturing method |
| CN111979481A (en) * | 2020-07-23 | 2020-11-24 | 张家港宏昌钢板有限公司 | Thin-gauge low-yield-ratio high-strength bridge steel and production method thereof |
| CN114669598A (en) * | 2022-04-07 | 2022-06-28 | 山东钢铁集团永锋临港有限公司 | Method for continuously casting 16m square billet and directly rolling bar |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603298A (en) * | 2016-02-03 | 2016-05-25 | 舞阳钢铁有限责任公司 | Low-yield-tensile-ratio steel plate for superwide bridges and production method thereof |
-
2017
- 2017-08-22 CN CN201710725554.1A patent/CN107604251A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603298A (en) * | 2016-02-03 | 2016-05-25 | 舞阳钢铁有限责任公司 | Low-yield-tensile-ratio steel plate for superwide bridges and production method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797350A (en) * | 2019-02-26 | 2019-05-24 | 南京钢铁股份有限公司 | A kind of Q345 series low-alloy steel Mn content minimizing manufacturing method |
| CN111979481A (en) * | 2020-07-23 | 2020-11-24 | 张家港宏昌钢板有限公司 | Thin-gauge low-yield-ratio high-strength bridge steel and production method thereof |
| CN114669598A (en) * | 2022-04-07 | 2022-06-28 | 山东钢铁集团永锋临港有限公司 | Method for continuously casting 16m square billet and directly rolling bar |
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Application publication date: 20180119 |