CN106811704A - Low-yield-ratio bridge steel with yield strength of 500MPa and manufacturing method thereof - Google Patents
Low-yield-ratio bridge steel with yield strength of 500MPa and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000003466 welding Methods 0.000 abstract description 13
- 229910052719 titanium Inorganic materials 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 238000010791 quenching Methods 0.000 abstract description 3
- 230000000171 quenching effect Effects 0.000 abstract description 3
- 229910001566 austenite Inorganic materials 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 239000010955 niobium Substances 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910001563 bainite Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The invention provides a low yield ratio bridge steel with 500MPa grade yield strength and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by weight: 0.05 to 0.10 percent of C, 0.10 to 0.50 percent of Si, 1.20 to 2.00 percent of Mn, 0.02 to 0.045 percent of Nb, 0.005 to 0.025 percent of Ti, 0.40 to 1.00 percent of Cr, 0.05 to 0.20 percent of Ni, 0.10 to 0.5 percent of Cu, 0.08 to 0.25 percent of Mo, 0.010 to 0.050 percent of Als, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: the rolling process adopts TMCP technology, the heating temperature before rolling is 1140-1200 ℃, three-stage controlled rolling is adopted, accelerated cooling is carried out after rolling, the start cooling temperature is 650-770 ℃, the termination temperature of accelerated cooling of the steel plate is 200-550 ℃, and then air cooling is carried out. The steel plate produced by the invention has the yield ratio of below 0.85, low cost and good toughness, plasticity and welding performance of steel grades. The production operation is convenient, and the secondary two-phase zone quenching and other heat treatment processes are not needed.
Description
Technical field
The invention belongs to metal material field, more particularly to low yield strength ratio bridge steel and its manufacturer
Method.
Background technology
Japanese JFE iron companies have applied for patent in 2004《Low yield ratio, high strength high tenacity
Steel plate and welded still pipe and their manufacture method》(application number：200480016295.6),
It is disclosed that the steel plate and its manufacture method of a kind of low yield ratio, high strength high tenacity.Its group
Part contains C0.03~0.1, Si0.01~0.50, Mn1.20~2.50, Al based on quality %
≤ 0.08, additionally optionally add Nb0.005~0.070, V0.005~0.10, Mo0.05~
0.40th, below Ni0.50, Ti0.005~0.04, below Cu0.5, below B0.005, Cr0.50
Below, Ca0.0005~0.003, surplus is substantially made up of Fe.Its technique is for after hot rolling
Steel plate carries out acceleration and is cooled to 450~650 DEG C with the cooling velocity of 5 DEG C/S, after cooling immediately with
The firing rate of 0.5 DEG C/S carries out being again heated to 550~750 DEG C, and yield tensile ratio can be controlled in 0.80
Below.Its weak point is：The firing equipment for needing configuration special is reheated after cooling immediately,
Substantially increase the production cost of steel.
《High-strength steel plate and its manufacture method and high tensile steel tube》(application number：
200680010512.X) disclose yield tensile ratio and can be controlled in less than 0.85, but also in
Reheated, it is necessary to configure special firing equipment immediately after cooling.The addition of other B element
The toughness for being easily caused steel plate suffers damage.
《800MPa grade high ductility low-yield ratio thick steel plates and its manufacture method》(application number：
200610025127.4) steel plate disclosed in its Ingredient percent is：C0.05~0.09,
Si0.35~0.55, Mnl.50~1.90, Ni0.30~0.70, Nb0.04~0.08, Al0.02~
0.04, Ti0.01~0.04, remaining Fe and inevitable impurity.
《700MPa grade high ductility low-yield ratio thick steel plates and its manufacture method》(application number
200510029246.2) 700MPa grade high ductility low-yield ratio thick steel plates disclosed in, its composition
Mass percent is：C0.03~0.06, Si0.35~0.55, Mnl.00~1.55, Ni0.50~
0.70, Nb0.02~0.06, A10.02~0.04, Ti0.01~0.04, V0.04~0.07,
Cu0.50~0.70, remaining Fe and inevitable impurity, yield tensile ratio can be controlled in less than 0.70.
Noble element Ni and higher is added in two rank steel of person in above two pieces invention
Cu contents, cause steel grade cost substantially to increase.
Japanese kobe steel institute (application number：200810174556.7)《Welding heat affected zone and mother metal
Excellent in low temperature toughness low yield strength ratio high-tensile steel and its manufacture method》Disclose surrender strong
The low yield strength ratio high tension steel of below 440MPa is spent, yield tensile ratio can be controlled in less than 0.80, but
It is B content 0.0007-0.0015% in its steel, it is inevitable to the infringement of steel grade toughness.
《A kind of controllable high-strength high-toughness steel plate of inexpensive yield tensile ratio and its manufacture method》(Shen
Please number：CN201010276628.6 a kind of low yield strength ratio steel plate, composition) are provided：C
0.04%~0.10%, Si 0.10%~0.50%, Mn 1.20%~2.00%, Nb 0.02%~
0.045%th, Ti 0.005%~0.025%, Cr 0.40%~1.00%, Mo 0.08%~0.25%,
Als 0.010%~0.050%, the composition and technique that the invention is provided can not be completely secured production
The yield strength of all steel grades be all higher than 500MPa and tensile strength is all higher than 630MPa.
In view of above-mentioned weak point and the problem of presence, the invention provides one kind in addition
After Cu, Ni element, the obdurability of steel plate can be significantly improved, and yield strength is more than 500MPa
While -40 DEG C of ballistic works can be made to reach more than 200J.
The content of the invention
A kind of yield strength is provided it is an object of the invention to overcome above mentioned problem and deficiency
500MPa grades of low yield strength ratio bridge steel and its manufacture method, the yield tensile ratio of steel plate can effectively be entered
Row control, it is with low cost, and steel grade toughness, plasticity and welding performance are good.Production operation side
Just, it is not necessary to the Technology for Heating Processing such as secondary two-phase section quenching.Can be applied to bridge, building iron knot
Structure etc..
The object of the present invention is achieved like this：
A kind of yield strength 500MPa grades of low yield strength ratio bridge steel, the composition of the steel plate is by weight
Amount percentages are as follows：C 0.05%~0.10%, Si 0.10%~0.50%, Mn 1.20%~
2.00%th, Nb 0.02%~0.045%, Ti 0.005%~0.025%, Cr 0.40%~1.00%,
Ni 0.05~0.20, Cu 0.10%~0.5%, Mo 0.08%~0.25%, Als 0.010%~
0.050%, balance of Fe and inevitable impurity.
Steel plate yield tensile ratio is below 0.85.
The alloying element of present invention selection is moved in as follows in the Main Function and design in steel：
C：Carbon is very big on the intensity of steel, toughness, welding performance influence.C content is less than 0.05
During %, it is difficult to obtain the high intensity and low yield tensile ratio for needing；When carbon is higher than 0.10%, influence
The toughness and welding performance of steel.
Mn：Manganese has larger facilitation to bainite transformation, is to improve intensity and toughness
Effective element, and cost is very cheap, therefore in the present invention using Mn elements as main
Alloying element, Mn contents are controlled 1.20%~2.0%.
Nb：Niobium is the important addition element in steel of the present invention, and it being capable of effectively delayed deformation
The recrystallization of austenite, prevents Austenite Grain Growth, improves austenite recrystallization temperature, drop
The rolling load of low non-recrystallization rolling, shortens time of staying temperature, improves productivity ratio, while improving
Intensity and toughness.It can promote bainite transformation, be played to bainite transformation with Mo elements
And improve the effect of yield strength.Nb contents are less than 0.02%, and above-mentioned effect is not obvious.Nb
When content is higher than 0.045%, steel grade yield tensile ratio and welding performance, therefore control are influenceed
Nb0.02%~0.045%.
Cu：The intensity and toughness of steel are significantly improved, the weatherability of steel plate is improved, hot-working is easy
Generation is hot-short, but when the content of Cu is higher than 0.5%, plasticity is significantly reduced.
Ni：Nickel can improve the intensity of steel, and keep good toughness and plasticity, improve steel plate
Weatherability, Ni:Cu is more than 2:3 red brittleness that can reduce Cu.
Ti：Add micro titanium, be in order to titanium, nitrogen form titanium nitride, prevent steel billet heating,
Rolling, crystal grain is grown up in welding process, improves the toughness of mother metal and welding heat affected zone.Titanium
When during less than 0.005% or more than 0.025%, it is difficult to play a part of fining austenite grains,
It is excessive even harmful to steel grade toughness.
Si：Silicon is the essential elements of deoxidation in steel making, it may have certain invigoration effect, works as content
During less than 0.1%, difficulty increase is smelted；When content is more than 0.5%, the cleannes of steel decline,
Toughness reduction, solderability is poor, and temper brittleness increases.Therefore Si0.10%~0.50% is controlled.
Als：Aluminium is deoxidant element, can be used as AlN formation elements, effectively crystal grain thinning,
When its content is less than 0.01%, effect is smaller；During more than 0.05%, deoxidation tends to saturation,
Increase steel inclusion, it is harmful to mother metal and welding heat influence area toughness.Therefore control
Als0.010%~0.050%.
Cr：Chromium is the important addition element in steel of the present invention, to improve the tensile strength of steel, drop
Low yield strength ratio, but too high Cr is also easy to produce Carbide Precipitation, influences steel grade toughness.From warp
From the aspect of Ji property, welding performance and intensity, toughness etc., in the present invention by Cr content controls
System is in Cr0.40%~1.00%.
Mo：Molybdenum contributes to the refinement and the generation of fine bainite of austenite crystal during rolling,
But its high cost, and solderability and toughness reduction.Because it is noble element, as this hair
The alloying element that bright control is added, according to steel plate thickness and intensity targets, present invention control
Mo0.08%~0.25%.
Impurity element in steel the upper limit control P≤0.025%, S≤0.015%, [N]≤
0.0080% is advisable, and content is lower, and steel grade performance is better.
A kind of manufacture method of yield strength 500MPa grades of low yield strength ratio bridge steel, including molten iron
Pretreatment-converter smelting-refining-continuous casting-rolling,
The operation of rolling uses TMCP techniques, rolls preceding heating-up temperature for 1140 DEG C~1200 DEG C,
Using the controlled rolling of three stages, 1000 DEG C~1100 DEG C of first stage finishing temperature, deflection 20~
30%, can fining austenite grains.950 DEG C of second stage finishing temperature~980 DEG C, deflection
30%~40%, after after warm-rolling system, austenite crystal is entered by Recovery and recrystallization
Step refining.700 DEG C~830 DEG C of phase III finishing temperature, deflection 35%~40%,
By after preceding two benches Austenite Grain Refinement, two-phase section zerolling being carried out in temperature range,
The tissue of steel plate is further refined, and cooling is accelerated after rolling, and opens 650 DEG C~770 DEG C of cold temperature,
Laminar cooling process final temperature is 200 DEG C~550 DEG C, afterwards air cooling, and steel plate yield tensile ratio can
Control is below 0.85.
Yield strength >=500N/mm that the present invention is provided2, tensile strength >=630N/mm2Intensity
The controllable high-strength high-toughness steel plate of yield tensile ratio and its manufacture method of rank, low production cost, and
The matching of obdurability, plasticity and welding performance is good.
The beneficial effects of the present invention are：
(1) yield strength >=500N/mm is realized2, tensile strength >=630N/mm2Intensity
Rank, yield tensile ratio≤0.85, thickness reach the manufacture of the tough cut deal of high strength and low cost of 60mm；
(2) steel grade carbon content of the present invention is low, and C0.05%~0.10%, welding performance is excellent,
Welding procedure can be simplified；
(3) steel grade need not carry out reheating the Technologies for Heating Processing such as quenching.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention carries out molten iron pretreatment-converter according to the component proportion of technical scheme
Smelting-refining-continuous casting-rolling.The smelting composition of embodiment of the present invention steel is shown in Table 1.This hair
The main technologic parameters of bright embodiment steel are shown in Table 2.The service check result of embodiment of the present invention steel
It is shown in Table 3.
The smelting composition of the embodiment of the present invention steel of table 1
The main technologic parameters of the embodiment of the present invention steel of table 2
The service check result of the embodiment of the present invention steel of table 3
Claims (3)
1. a kind of yield strength 500MPa grades of low yield strength ratio bridge steel, it is characterised in that should
The composition of steel plate is as follows by weight percentage：C0.05%~0.10%, Si0.10%~0.50%,
Mn1.20%~2.00%, Nb0.02%~0.045%, Ti0.005%~0.025%, Cr0.40%~
1.00%th, Ni 0.05%~0.20%, Cu 0.10%~0.5%, Mo0.08%~0.25%,
Als0.010%~0.050%, balance of Fe and inevitable impurity.
2. yield strength 500MPa grades of low yield strength ratio bridge steel according to claim 1, its
It is characterised by, the steel plate yield tensile ratio is below 0.85.
3. yield strength 500MPa grades of low yield strength ratio bridge described in a kind of claim 1 or 2
The manufacture method of steel, including molten iron pretreatment-converter smelting-refining-continuous casting-rolling, its
It is characterised by：The operation of rolling uses TMCP techniques, and it is 1140 DEG C~1200 to roll preceding heating-up temperature
DEG C, using the controlled rolling of three stages, 1000 DEG C of first stage finishing temperature~1100 DEG C, deflection
20%~30%；950 DEG C~980 DEG C of second stage finishing temperature, deflection 30%~40%；
700 DEG C~830 DEG C of phase III finishing temperature, deflection 35%~40% accelerates cold after rolling
But, 650 DEG C~770 DEG C of cold temperature is opened, laminar cooling process final temperature is 200 DEG C~550
DEG C, air cooling afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510870383.2A CN106811704A (en) | 2015-12-02 | 2015-12-02 | Low-yield-ratio bridge steel with yield strength of 500MPa and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510870383.2A CN106811704A (en) | 2015-12-02 | 2015-12-02 | Low-yield-ratio bridge steel with yield strength of 500MPa and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
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Family
ID=59109089
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109550806A (en) * | 2017-09-27 | 2019-04-02 | 鞍钢股份有限公司 | Production method of 500 MPa-level low-yield-ratio bridge steel plate |
| CN110863139A (en) * | 2019-10-31 | 2020-03-06 | 鞍钢股份有限公司 | Ultralow-temperature-impact-resistant 420 MPa-grade weather-resistant bridge steel and production method thereof |
| CN112210719A (en) * | 2020-09-29 | 2021-01-12 | 南京钢铁股份有限公司 | Low-cost high-performance Q500 bridge steel and production method thereof |
| CN112553530A (en) * | 2020-12-04 | 2021-03-26 | 安阳钢铁股份有限公司 | Low-yield-ratio 700MPa high-strength bridge steel and manufacturing method thereof |
| CN116005076A (en) * | 2023-02-07 | 2023-04-25 | 安徽工业大学 | Nb-V-Ti composite microalloyed TMCP bridge weathering steel and manufacturing method thereof |
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| CN102400055A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Low-cost yield ratio controllable high-strength high-toughness steel plate and manufacturing method thereof |
| CN102851615A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Tensile strength 800 MPa-grade low-yield-ratio structural steel plate and manufacturing method thereof |
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| CN102400055A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Low-cost yield ratio controllable high-strength high-toughness steel plate and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109550806A (en) * | 2017-09-27 | 2019-04-02 | 鞍钢股份有限公司 | Production method of 500 MPa-level low-yield-ratio bridge steel plate |
| CN110863139A (en) * | 2019-10-31 | 2020-03-06 | 鞍钢股份有限公司 | Ultralow-temperature-impact-resistant 420 MPa-grade weather-resistant bridge steel and production method thereof |
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| CN116005076A (en) * | 2023-02-07 | 2023-04-25 | 安徽工业大学 | Nb-V-Ti composite microalloyed TMCP bridge weathering steel and manufacturing method thereof |
| CN116005076B (en) * | 2023-02-07 | 2023-09-12 | 安徽工业大学 | Nb-V-Ti composite microalloyed TMCP bridge weathering steel and manufacturing method thereof |
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