CN102041435A - Hot rolling steel plate made of weldable fine grain structural steel S355ML and production method thereof - Google Patents
Hot rolling steel plate made of weldable fine grain structural steel S355ML and production method thereof Download PDFInfo
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Abstract
The invention discloses a steel plate made of weldable fine grain structural steel S355ML and a production method thereof. The steel plate contains the following chemical components in percentage by weight: 0.08-0.14% of C, 0.20-0.50% of Si, 1.20-1.60% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, less than or equal to 0.07% of micro-alloying element (Nb and Ti), less than or equal to 0.050% of Als and balance of Fe and residual elements. The production method provided by the invention comprises the steps of smelting with a rotating furnace, LF (Low Frequency) refining, vacuum refining, continuous casting, heating, rolling, controlled cooling and slow cooling. The substance quality of the product provided by the invention reaches the weldable fine grain structural steel S355ML capable of protecting properties and protecting flaw detection. The redundant amount of the properties of the S355ML is relatively large; the yield strength is 390-450MPa, and the redundant amount is more than 50MPa; the tensile strength is 520-570MPa, and the redundant amount is more than 45MPa; the extension amount is 25-28%, and the redundant amount is more than 3%; the redundant amount of the longitudinal impact power at 50 DEG C below zero is more than 150J; the redundant amount of the lateral impact power at 50 DEG C below zero is more than 130J; and the property indexes completely meet the requirements for the development of the weldable fine grain structural steel S355ML.
Description
Technical field
The present invention relates to steel, be specifically related to a kind of fine grained structural steel S355ML steel plate and production method thereof of welding.
Background technology
Quick progress along with the Iron and Steel Enterprises in China technology, the update of steel equipment and technology, the plate quality grade of producing improves fast, most of steel plate changes into homemade by import, require steel plate such as low-temperature pressure vessel steel ,-50 ℃ of ballistic works, in order to improve the market competitiveness, accelerate technological progress in enterprises, research and develop the direction that high-level steel grade becomes development of iron and steel enterprises.In the process of producing, need to add the Ni element, guarantee-50 ℃ of ballistic works, and provide certain intensity, the production cost height.
Summary of the invention
At the problems referred to above, the inventor does not add the Ni element through groping, and guarantees-50 ℃ of horizontal, impact of collision merits of steel plate, has obtained a kind of welding fine grained structural steel S355ML steel plate, thereby has finished the present invention.
Therefore, the object of the present invention is to provide a kind of welding fine grained structural steel S355ML steel plate.
Another object of the present invention is to provide the production method of this this steel plate.
For reaching above-mentioned first purpose, the technical scheme that the present invention takes be this welding fine grained structural steel S355ML steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.08～0.14, Si:0.20～0.50, Mn:1.20～1.60, P :≤0.018, S :≤0.005, micro alloying element (Nb+Ti)≤0. 07, Als :≤0.050, other is Fe and relict element.
The function analysis of above-mentioned chemical element is as follows:
C: be most basic strengthening element in the steel, improve intensity, but C influences the welding property of steel and influences toughness.Take all factors into consideration, the content of carbon is hanging down of control as far as possible.
Si: be the solution strengthening element, favourable to the intensity that improves steel plate.
Mn: be the solution strengthening element, all favourable to intensity and the toughness that improves steel plate.
P: unfavorable to welding, and have certain cold shortness, and in this steel grade, belong to harmful element, that should control is low as far as possible.
S: easily form the MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, that should control is low as far as possible.
, Ti:In steel, can combine, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of effective raising steel with C, N.
:Can play the crystal grain thinning strengthening effect.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, cold, the slow cooling of control.Described rolling in, start rolling temperature 1020-1100 ℃, adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, rolling line speed≤2.0m/s, and total draft is not less than 60%, stop rolling the steel that dries in the air when temperature is not less than 1000 ℃, the steel thickness that dries in the air is 3 times of finished product thickness; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm by 780～860 ℃ of controls, thickness＞50mm by 760～840 ℃ of controls; In described control is cold, return 620～700 ℃ of red temperature.
By reasonably taking the chemical composition design of polynary composite micro-alloyed element, LF technology guarantees the cleanliness factor of steel, reach each type impurity rank summation and be no more than 3.0, make the grain fineness number of steel reach 9.0～11.0 grades by controlled rolling and controlled cooling, by the above-mentioned effective enforcement that waits measure, successfully produce a kind of guaranteed cost, protect flaw detection welding fine grained structural steel S355ML steel plate.
Hot metal pretreatment to whole thermal treatment whole process, has been worked out strict process point control standard, and strict the execution, the quality in kind of product has reached a kind of guaranteed cost, has protected flaw detection welding fine grained structural steel S355ML.The performance surplus capacity of S355ML is bigger, yield strength is at 390～450Mpa, more than the 50Mpa more than needed, tensile strength 520～570Mpa, more than the 45Mpa more than needed, elongation is 25～28%, more than needed more than 3%, more than-50 ℃ of impact of collision merit 150J more than needed ,-50 ℃ of transverse impact merits are had more than needed more than 130J, and performance index have satisfied welding fine grained structural steel S355ML development requires fully.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 is the metallographic structure figure (ferrite+perlite 100X) of TMCP of the present invention after rolling.
Embodiment
A kind of guaranteed cost of the present invention, guarantor's flaw detection welding fine grained structural steel S355ML steel plate.Steel plate comprise following weight percent chemical ingredients (unit, wt%):
C:0.08～0.14, Si:0.20～0.50, Mn:1.20～1.60, P :≤0.018, S :≤0.005, micro alloying element (Nb+Ti)≤0. 07, Als :≤0.050, other is Fe and relict element.
The production method that the present invention takes comprises: converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, cold, the slow cooling of control, and in described converter smelting, in described converter smelting, tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 15min; By II group steel heating, two heating zone temperature are controlled at 1240～1280 ℃, and the soaking zone temperature is controlled at 1220～1260 ℃, heat-up time 9～12min/cm(soaking time＞30min); Described rolling in, start rolling temperature 1020-1100 ℃, adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, total draft is not less than 60%, stops rolling the steel that dries in the air when temperature is not less than 1000 ℃, the steel thickness that dries in the air is 3 times of finished product thickness; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm by 780～860 ℃ of controls, thickness＞50mm by 760～840 ℃ of controls; In described control is cold, return 620～700 ℃ of red temperature; In described slow cooling, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour.
Embodiment 1
By converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, cold, the slow cooling of control, the S355ML finished product steel plate chemical ingredients that acquisition is described in table 1 below, wherein each processing parameter and mechanical property are seen as following table 4,5.
The chemical ingredients of table 1 embodiment 1 steel
Technical process of the present invention:
Slow cooling → surface inspection → finishing → flaw detection → detection → judgement → salable product warehouse-in is aligned → is rolled off the production line in the dark desulfurization → converter smelting of molten iron KR → LF refining → VD vacuum-treat → continuous casting → heating → dephosphorization → controlled rolling → controlled chilling → control.
1.1 steel-making part
1.1 .1 composition design
The chemical composition design of steel plate of the present invention adopts low-carbon-equivalent, and Mn-Nb-Ti is ferrite+perlitic steel, and the strengthening mechanism of application is build up, refined crystalline strengthening, precipitation strength and solution strengthening.Main and other element formation carbide of C plays build up and precipitation strength effect, improves armor plate strength; Mn mainly plays solution strengthening and reduces transformation temperature, works to improve armor plate strength; Nb, Ti play the refined crystalline strengthening effect, and during heating, the Nb of solid solution can stop austenite crystal to be grown up; For guaranteeing flaw detection, take the Clean Steel smelting technology simultaneously, the steel grade of keeping under strict control [P], [S], [N], [H], [O] five big harmful element content.
1.1.3 converter smelting process point requirement
Control tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012% by Clean Steel smelting technology standard; Point blows number of times and must not avoid slag under the tapping process greater than 2 times.
1.1.4 LF refinery practice point requirement
Take the big quantity of slag to carry out slag making, really how the white slag hold-time is controlled at more than the 15min; Stop the rare phenomenon of slag; Carry out the Argon operation in strict accordance with the Argon standard, forbid blowing cruelly.
1.1.5 continuous casting process point requirement
Adopt the production of 250mm section, to guarantee compression ratio, the continuous casting superheating temperature is controlled at 10～20 ℃, adopts low pulling rate.
1.2 steel rolling process point control requirement
1.2.1 heating process point
By II group steel heating, two heating zone temperature are controlled at 1240～1280 ℃, and the soaking zone temperature is controlled at 1220～1260 ℃, heat-up time 9～12min/cm.
1.2.2 rolling technology
Adopt two stage rolling, 1020～1100 ℃ of stage start rolling temperatures adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, total draft is not less than 60%, stops rolling the steel that dries in the air when temperature is not less than 1000 ℃, and the steel thickness that dries in the air is 3 times of finished product thickness; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm by 780～860 ℃ of controls, thickness＞50mm by 760～840 ℃ of controls;
1.2.3 cooling control technology
Go into water temp 〉=740 ℃ after rolling, final cooling temperature is controlled at 620～700 ℃;
1.2.4 retarded cooling process
Carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature 〉=400 ℃; Cooling in heap time 〉=12 hour.
2.1 Chemical Composition
Main and other element formation carbide of C plays build up and precipitation strength effect, improves armor plate strength; Mn mainly plays solution strengthening and reduces transformation temperature, works to improve armor plate strength; Nb plays the refined crystalline strengthening effect, and during heating, the Nb of solid solution can stop austenite crystal to be grown up.P, S content are controlled in the lower scope, and in a word, whole Composition Control is more stable, satisfy the design requirements of welding fine grained structural steel S355ML composition.
Specifically see Table 2.
Table 2S355ML steel plate mechanical mechanics property
This produces 74 crowdes of the thick S355ML of 50～60mm altogether, the performance surplus capacity of S355ML is bigger, yield strength is at 390～450Mpa, more than the 50Mpa more than needed, and tensile strength 520～570Mpa, more than the 45Mpa more than needed, elongation is at 25-28%, and is more than needed more than 3%, more than-50 ℃ of impact of collision merit 150J more than needed,-50 ℃ of transverse impact merits are had more than needed more than 130J, can satisfy the S355ML standard-required fully.
2.3 examine outward and detect a flaw
The steel plate of being developed is examined outward, the percentage of A-class goods 100%, and unification level rate is 100%, has reached desired result.
2.4 metallographic examination
Table 3 metallographic structure
Associative list 3 and Fig. 1 analysis, the steel plate after rolling is organized as ferrite and perlite, and grain fineness number reaches 9.0～10.0 grades.
Claims (2)
1. one kind can be welded fine grained structural steel S355ML steel plate, this steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.08～0.14, Si:0.20～0.50, Mn:1.20～1.60, P :≤0.018, S :≤0.005, micro alloying element (Nb+Ti)≤0. 07, Als :≤0.050, other is Fe and relict element.
2. the production method that can weld fine grained structural steel S355ML steel plate according to claim 1, this method comprises: converter smelting, LF refining, vacuum refinement, continuous casting, heating, rolling, cold, the slow cooling of control; It is characterized in that described rolling in, start rolling temperature 1020-1100 ℃, adopt high temperature low speed to depress rolling mode greatly, reduction in pass is not less than 15mm, rolling line speed≤2.0m/s, total draft is not less than 60%, stops rolling the steel that dries in the air when temperature is not less than 1000 ℃, and the steel thickness that dries in the air is 3 times of finished product thickness; It is rolling to begin subordinate phase when the rolled piece temperature is 840～880 ℃, and last three percentage pass reductions are 〉=15%, and the accumulative total draft is not less than 60%, finishing temperature: thickness≤50mm by 780～860 ℃ of controls, thickness＞50mm by 760～840 ℃ of controls; In described control is cold, return 620～700 ℃ of red temperature.
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| CN102345060A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | S355J2 boron steel plate without surface crack and production method thereof |
| CN102345043A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | Q370qE thick plate and its production method |
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| CN102345060B (en) * | 2011-06-28 | 2014-07-30 | 南阳汉冶特钢有限公司 | S355J2 boron steel plate without surface crack and production method thereof |
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Application publication date: 20110504 |