CN100516270C - Thick steel plate with high strength and low welding crack sensitivity and its production process - Google Patents

Thick steel plate with high strength and low welding crack sensitivity and its production process Download PDF

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CN100516270C
CN100516270C CNB2005100471960A CN200510047196A CN100516270C CN 100516270 C CN100516270 C CN 100516270C CN B2005100471960 A CNB2005100471960 A CN B2005100471960A CN 200510047196 A CN200510047196 A CN 200510047196A CN 100516270 C CN100516270 C CN 100516270C
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steel plate
steel
strength
rolling
cooling
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CNB2005100471960A
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CN1932063A (en
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苏国阳
张禄林
郝森
高亮
徐烈山
王丽慧
梁福鸿
李新玲
信昕
马成
刘曙光
马玉璞
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鞍钢股份有限公司
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Abstract

The present invention discloses one kind of thick steel plate with high strength and low welding crack sensitivity and its production process. The chemical composition includes C 0.06-0.09 wt%, Si 0.15-0.55 wt%, Mn 1.00-1.60 wt%, P not more than 0.015 wt%, S not more than 0.006 wt%, Ni 0.15-0.40 wt%, Cr not more than 0.30 wt%, Mo not more than 0.30 wt%, Cu not more than 0.30 wt%, V 0.02-0.06 wt%, Nb 0.005-0.05 wt% and Als 0.010-0.04 wt%, except Fe and inevitable impurities; and meets Pcm not higher than 0.20 % and Ceq not higher than 0.42 %. The production process includes two stage controlled rolling, on-line laminar flow cooling, off-line tempering and other steps. The produced steel plate has thickness up to 75mm, tensile strength not lower than 610 MPa and very low welding crack sensitivity.

Description

Thick steel plate with high strength and low welding crack sensitivity and production method thereof
Technical field
The invention belongs to low alloy steel and make the field, it relates to a kind of steel for welded structures, specifically is that a kind of tensile strength is 610Mpa level low welding crack sensibility high-strength steel and production method thereof.
Background technology
Before the present invention, the spy opens in clear 49-37814 communique and the special fair 4-13406 communique and has been disclosed as the reduction welding crack sensibility, the technology of falling C and adding Ti-B.So far, tensile strength 600Mpa level low welding crack sensibility high-strength steel plate adopts the quenching and tempering type production technology basically, nearly all is by adding the hardening capacity that B guarantees steel.Guarantee the intensity of steel with B, increase the hardening capacity of steel, chemical ingredients and create conditions and will change may cause the hardness of mother metal unstable properties, particularly welded heat affecting zone to significantly improve.The raising of welded heat affecting zone hardness degenerates the toughness of welding welded bonds.
Open clear 60-9086 the spy, the spy opens flat 2-254119, and the spy opens clear 59-113120, and the spy opens the technology that has proposed not add B in the clear 61-12970 communique.
Wherein the spy opens clear 60-9086, Te Kaiping 2-254119, the technology that the spy opens in the clear 59-113120 communique all is the technology of the non-modified shaped steel of 600Mpa level, but finds out that from embodiment the thickness of slab upper limit that these technology are suitable for all is about 20mm, and thicker steel plate is record not.
Te Kaiping 10-68045 communique is the production method with good welds crack sensitivity and large-line energy welding back HI high impact value steel of 570Mpa high intensity levels.This armor plate strength is on the low side.And to Nb in the steel, V content (effectively Nb)+250V+210Ceq 〉=t+40 (t is steel plate thickness mm) is limited, so the thickness of steel plate also will be restricted with formula 625.
Just also not record of the production of domestic relevant thick steel plate with high strength and low welding crack sensitivity (the thickest reaching more than the 75mm) at present.
Summary of the invention
The purpose of this invention is to provide a kind of low-welding crack-sensitive Wide and Heavy Plates and production method thereof, steel plate tensile strength 〉=610Mpa, the steel plate maximum width reaches 3900mm, and the steel plate maximum ga(u)ge reaches 75mm.Steel plate has the low-welding crack-sensitive excellent properties.
To achieve the above object, the present invention adopts following chemical ingredients (by weight percentage): C:0.06%~0.09%, Si:0.15%~0.55%, Mn:1.00%~1.60%, P: S≤0.015% :≤0.006%, Ni:0.15%~0.40%, Cr:0%~0.06%, Mo: Cu≤0.30% :≤0.30%, V:0.02%~0.06%, Nb:0.005%~0.05%, Als:0.010%~0.04%, surplus are Fe and inevitably are mingled with.
In addition, steel chemical composition of the present invention also must satisfy:
Pcm=C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%;
Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14≤0.42%;
When concrete scheme of the present invention has the 40mm of production with lower steel plate, C:0.06% in the steel~0.07%, Si:0.15%~0.30%, Mn:1.20%~1.50%, P≤0.015%, S≤0.006%, Ni:0.15%~0.25%, Mo:0.15%~0.25%, Cu:0.05%~0.15%, V:0.02%~0.04%, Nb:0.005%~0.02%, Als:0.010%~0.040%, surplus is Fe and inevitably is mingled with, Pcm maximum value 0.187%, Ceq maximum value 0.404%.
When concrete scheme of the present invention has the 40~75mm of production steel plate, C:0.07% in the steel~0.09%, Si:0.15%~0.30%, Mn:1.30%~1.50%, P≤0.015%, S≤0.006%, Ni:0.15%~0.25%, Mo:0.20%~0.30%, Cu:0.10%~0.20%, V:0.03%~0.06%, Nb:0.010%~0.04%, Als:0.010%~0.04%, surplus are Fe and inevitably are mingled with.Pcm maximum value 0.195%, Ceq maximum value 0.418%.
Details are as follows to the reason of C, Si, Mn, P, S, Als, Ni, Cr, Mo, V, Cu, Nb limited amount among the present invention:
C:C≤0.06% o'clock need add other and improve the hardening capacity element, and cost is raise, and toughness and weldability degenerate.Welding joint toughness for after guaranteeing welding crack sensibility and adding Nb is limited to 0.09% on the C.
Si: play a role in guaranteeing strength of parent and strength of welded joint for making Si, Si should be greater than 0.15%.
Mn: guaranteeing that for making Mn strength of parent and strength of welded joint play a role, its content answers 〉=1.20%.But Mn>1.60% o'clock degenerates welding crack sensibility, and owing to brings excessive hardening capacity that base metal tenacity and joint toughness are degenerated.
P, S:P, S are impurity elements.Be limited in P≤0.015%; S≤0.006%.
Als:Als can reduce the amount and the size thereof of M-A constituent element, has reduced solid solution N amount.The content of Al is 〉=0.010% generally speaking, is limited to 0.040% on the adding Als.
Ni, Cr:Ni, Cr help improving the intensity of mother metal and welding joint.Ni can further improve toughness.But surpass required amount Ceq is increased, cause the toughness reduction and the processibility of welding joint to degenerate, so the content of Ni be: 0.15%~0.40% as addition.Be limited to 0.06% on the Cr.
Mo: effective to improving strength of parent and strength of welded joint, on be limited to 0.30%.For guaranteeing required hardening capacity, the following of interpolation is limited to 0.15%.
Cu:Cu helps improving the intensity of mother metal and welding joint.Be limited to 0.30% on the Cu.
Nb: be to guarantee strength of parent and strength of welded joint, the dosage of Nb should 〉=0.005%, but Nb 〉=0.05% o'clock welding joint toughness degenerates, so will be defined as 0.05% on the Nb, is limited to 0.03% on preferably.The raising hardening capacity effect of solid solution Nb when utilizing rolling the heating.Can reduce the add-on that other improves the hardening capacity element with the direct quenching method.The precipitation-hardening effect of Nb carbonitride when utilizing temper after the direct quenching.This method can guarantee the intensity of speed of cooling less than the steel plate center on surface.That is to say that this method has guaranteed that not only necessary hardening capacity has also guaranteed the intensity of steel plate.
V:
V adds for guaranteeing strength of parent and strength of welded joint, and addition is 0.02~0.06%.But,, will make the welding crack sensibility variation, and diminish base metal tenacity as surpassing 0.1%.
B: to the chemical ingredients of steel and the variation of creating conditions, cause the hardness of mother metal unstable properties, particularly welded heat affecting zone to significantly improve for fear of B, and the toughness of welding welded bonds is degenerated, do not add B in the steel of the present invention.
Pcm:
Pcm represents the welding cold crack sensitivity coefficient, under common environment, does not need preheating during welding procedure, so be defined in≤0.20%.
Ceq:
Ceq is the carbon equivalent value.The 610N/mm of thicker specification 2The grade high-strength steel guarantees strength of parent and strength of welded joint by adding Nb, and the Ceq value can be no more than 0.42%.
Thickness range of the present invention, the i.e. scope of 23~75mm.
The production method of high-strength steel of the present invention adopts molten iron to give treatment technology, converter smelting, and LF stove+Clean Steel technologies such as VD stove vacuum-treat are smelted and continuous casting.
A) Heating temperature before the hot rolling:
Heating temperature is if surpass 1200 ℃, may cause steel original austenite grains thickization and can not guarantee the toughness of mother metal, so on be limited to 1200 ℃.The steel billet tapping temperature is 1150~1180 ℃.But consider the suitable dissolving of microalloy element, Heating temperature must guarantee to be lower than 1000 ℃.
B) rolling condition:
Rolling technology adopts austenite perfect recrystallization district+two the stage controlled rollings in austenite non-recrystallization district technology after the steel soaking of the present invention.
The austenite recrystallization district is rolling: the fs of controlled rolling, temperature range is between 1100~970 ℃.For guaranteeing base metal tenacity and avoid producing the thick crystal grain of local anomaly that should make every time draft greater than 8%, preferably greater than 10%, maximum single pass draft is 20%.
Austenite non-recrystallization district is rolling: the subordinate phase of controlled rolling, temperature range be controlled at≤and 930 ℃.For thereby the effect that guarantees grain refining reaches yield strength and the flexible purpose that improves steel, should guarantee cumulative deformation 〉=55% in this stage, the cumulative maximum deflection is 65%.
C) online laminar flow cooling (direct quenching):
After hot rolling finishes, with temperature at Ar 3Above steel plate is forced cooling (controlled chilling carries out) in the ACC device.When forcing cooling water is applied on the steel plate equably, the water temp of going into of steel plate is 745~780 ℃, and the final cooling temperature of steel plate is controlled at 420~500 ℃ of intervals.The speed of cooling of steel plate is controlled at 5~13 ℃/s interval.The speed of cooling that should make thickness of slab 1/2 place at least 1 ℃/more than the s.
D) temper:
The purpose of temper is implemented for eliminating stress.Also have in the present invention and make Nb and V carbide separate out the special role that improves and guarantee strength of parent.Can achieve the above object carrying out tempering more than 600 ℃.But tempering when the temperature that surpasses 650 ℃, intensity significantly reduces.
So advantage of the present invention and effect exist: chemical composition design is simple, by element addition and kind few principle of trying one's best, reasonably adjust the proportional quantity of each element, control welding cold crack sensitivity coefficient value Pcm≤0.20%, control carbon equivalent value Ceq≤0.42%, as long as the weld heat input input is satisfied≤the 40kJ/cm condition, can guarantee the performance of steel plate, reduce production cost; Adopt technologies such as austenite perfect recrystallization district+two stage controlled rollings in austenite non-recrystallization district, the cooling of online laminar flow and off-line tempering, the steel plate interior tissue is ferrite+bainite heterogeneous structure, is handling less than 600 ℃ of following stress-removals the welding back, organize and do not change, the thickness of this steel plate reaches 75mm, steel plate tensile strength 〉=610Mpa, and steel plate need not to carry out modifier treatment, possesses the low-welding crack-sensitive excellent properties.Production technique of the present invention is easy, is fit to produce in batches operation, and steel plate welding back is functional.
Description of drawings
Accompanying drawing 1 is 30mm steel plate full thickness hardness test result of the present invention,
Accompanying drawing 2 is 55mm steel plate full thickness hardness test result of the present invention,
Accompanying drawing 3 is 75mm steel plate full thickness hardness test result of the present invention,
Accompanying drawing 4 is Y of the present invention slope welding crack test principle figure.
Embodiment
The chemical ingredients of steel of the present invention is (by weight percentage), C:0.06%~0.09%, Si:0.15%~0.55%, Mn:1.00%~1.60%, P≤0.015%, S≤0.006%, Ni:0.15%~0.40%, Cr:0%~0.06%, Mo≤0.30%, Cu≤0.30%, V:0.02%~0.06%, Nb:0.005%~0.05%, Als:0.010%~0.04%, surplus are Fe and inevitably are mingled with.
In addition, steel chemical composition of the present invention also must satisfy:
Pcm=C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%;
Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14≤0.40%。
When concrete scheme of the present invention has the 40mm of production with lower steel plate, C:0.06% in the steel~0.07%, Si:0.15%~0.30%, Mn:1.20%~1.50%, P≤0.015%, S≤0.006%, Ni:0.15%~0.25%, Mo:0.15%~0.25%, Cu:0.05%~0.15%, V:0.02%~0.04%, Nb:0.005%~0.02%, Als:0.010%~0.040%, surplus are Fe and inevitably are mingled with.Pcm maximum value 0.187%, Ceq maximum value 0.404%.
When concrete scheme of the present invention has the 40~75mm of production steel plate, C:0.07% in the steel~0.09%, Si:0.15%~0.30%, Mn:1.30%~1.50%, P≤0.015%, S≤0.006%, Ni:0.15%~0.25%, Mo:0.20%~0.30%, Cu:0.10%~0.20%, V:0.03%~0.06%, Nb:0.010%~0.04%, Als:0.010%~0.04%, surplus is Fe and inevitable inclusion, the Pcm maximum value is 0.195%, and the Ceq maximum value is 0.418%.
Adopt molten iron to give treatment technology by above-mentioned composition, converter smelting, LF stove+Clean Steel technologies such as VD stove vacuum-treat are smelted the molten steel of producing, make continuously cast bloom through slab caster, the temperature control heating was carried out in shove charge after continuous casting steel billet arrived Thick Plate Plant, and the slab laggard horizontal high voltage water surface de-scaling of coming out of the stove is handled.Its rolling technology step is as follows:
A) Heating temperature before the hot rolling:
Billet heating temperature must guarantee to be lower than 1000 ℃, does not the highlyest surpass 1200 ℃, and best tapping temperature is 1150~1180 ℃.
B) rolling condition:
Rolling technology adopts austenite perfect recrystallization district+two the stage controlled rollings in austenite non-recrystallization district technology after the steel soaking of the present invention;
The austenite recrystallization district is rolling: the fs of controlled rolling, temperature range for guaranteeing base metal tenacity and avoiding producing the thick crystal grain of local anomaly, should make every time draft greater than 8% between 1100~970 ℃, maximum single pass draft is 20%, and optimum value is 12%~15%.
Austenite non-recrystallization district is rolling: the subordinate phase of controlled rolling, temperature range be controlled at≤and 930 ℃.For thereby the effect that guarantees grain refining reaches yield strength and the flexible purpose that improves steel, should guarantee cumulative deformation 〉=55% in this stage, the cumulative maximum deflection is 65%;
C) online laminar flow cooling (direct quenching):
After hot rolling finishes, with temperature at Ar 3Above steel plate is forced cooling (controlled chilling carries out) in the ACC device, should make water be applied on the steel plate equably when forcing cooling, the water temp of going into of steel plate is 745~780 ℃, laminar flow cooling roller bed speed 0.5~0.9m/s, and the final cooling temperature of steel plate is controlled at 420~500 ℃ of intervals; The speed of cooling of steel plate is controlled at 5~13 ℃/s interval, the speed of cooling at thickness of slab 1/2 place at least 1 ℃/more than the s;
D) temper:
The purpose of temper is implemented for eliminating stress, also have in the present invention and make Nb and V carbide separate out the special role that improves and guarantee strength of parent, can achieve the above object carrying out tempering more than 600 ℃, the highlyest be no more than 650 ℃, optimum tempering temperature is 610~630 ℃.
Table 1 is several embodiments of the present invention and testing performance index result.
The present invention has done corresponding test to other indexs of welding steel.
1. strain aging sensitivity test:
Sample is taken from TMCP+ Annealed Strip finished product steel plate, tests according to GB4160 " the strain aging sensitivity test method (summer is than ballistic method) of steel ", and the strain aged test result is as follows for steel plate (laterally sample):
30.0mm steel plate:
55.0mm steel plate:
75.0mm steel plate:
2. steel plate full thickness hardness test:
Test-results is shown in Fig. 1~3.
3.NDT test:
Carry out according to GB6803 " the nil-ductility temperature drop weight test method of ferritic steel " standard.Sample type is the P3 type, is of a size of 16mm * 50mm * 130mm.Heat-eliminating medium is dehydrated alcohol, dry ice and liquid nitrogen, and soaking time is 30 minutes, and blow energy is 400J (the thick test plate (panel) blow energy of 30.0mm is 450J).
Test-results is as follows:
Specification ??-40℃ ??-45℃ ??-55℃ ??-60℃ ??-78℃ -90 ℃ (reference) ??NDT(℃)
??30mm ??-- ??-- ??○○ ??○○ ??○○ ??○× ??-78~-90
??40mm ??-- ??-- ??○○ ??○× ??-60
??45mm ??-- ??-- ??○○ ??○○ ??○○ ??○× ??-78~-90
??50mm ??-- ??-- ??○○ ??○○ ??○○ ??○× ??-78~-90
??55mm ??-- ??-- ??○○ ??○○ ??○○ ??○× ??-78~-90
??67mm ??○○ ??○× ??-55
??75mm ??○○ ??○○ ??○× ??○× ??-55
Annotate: because the testing installation condition is limit ,≤-78 ℃ temperature can't accurately be controlled (only for reference).
4. steel plate welding test of the present invention
1) maximum hardness test: 30mm, 45mm, 55mm, 67mm, 75mm steel plate are tested by GB4675.5-84 " welded heat affecting zone maximum hardness test method ".
Welded heat affecting zone maximum hardness test result
2) oblique Y groove welding crack test
By GB4675.1-84 " tiltedly Y type groove welding crack test method " 30mm, 45mm, 55mm, 67mm, 75mm steel plate are tested, test principle figure as shown in Figure 4.
Oblique Y groove welding crack test result
Zero flawless produces
3) welding joint test
Utilize covered arc welding and shielded welding to carry out the jam welding of 30mm, 45mm, 55mm and 67mm steel plate, and take a sample and check by JB4708-2000 " steel pressure vessel welding technology evaluation ".
3.1 weldprocedure
Jam welding technology
The covered arc welding backing welding adopts φ 4.0mm welding rod, electric current 170A, voltage 25V, speed 110mm/min, heat input 2..2kJ/min.
3.2 the stretching of welding joint and cold bending test
The stretching of welding joint and cold bending test result
Zero is that clod wash is qualified.
3.3 the impact ductility test of welding joint
The impact ductility test result of welding joint
3.4 the serial impelling strength of weld seam and heat affected zone
The serial impact ductility test result of weld seam and heat affected zone

Claims (4)

1, a kind of thick steel plate with high strength and low welding crack sensitivity, it is characterized in that adopting following chemical ingredients, by weight percentage: C:0.06%~0.09%, Si:0.15%~0.55%, Mn:1.00%~1.60%, P: S≤0.015% :≤0.006%, Ni:0.15%~0.40%, Cr:0%~0.06%, Mo: Cu≤0.30% :≤0.30%, V:0.02%~0.06%, Nb:0.005%~0.03%, Als:0.010%~0.04%, surplus is Fe and inevitably is mingled with that the chemical ingredients of steel also must satisfy:
Pcm=C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.20%;
Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14≤0.42%。
2, a kind of thick steel plate with high strength and low welding crack sensitivity according to claim 1, when producing 40mm with lower steel plate, C:0.06% in the steel~0.07%, Si:0.15%~0.30%, Mn:1.20%~1.50%, P≤0.015%, S≤0.006%, Ni:0.15%~0.25%, Mo:0.15%~0.25%, Cu:0.05%~0.15%, V:0.02%~0.04%, Nb:0.005%~0.02%, Als:0.010%~0.040%, surplus is Fe and inevitably is mingled with, the Pcm maximum value is 0.187%, and the Ceq maximum value is 0.404%.
3, a kind of thick steel plate with high strength and low welding crack sensitivity according to claim 1, when producing 40~75mm steel plate, C:0.07% in the steel~0.09%, Si:0.15%~0.30%, Mn:1.30%~1.50%, P≤0.015%, S≤0.006%, Ni:0.15%~0.25%, Mo:0.20%~0.30%, Cu:0.10%~0.20%, V:0.03%~0.06%, Nb:0.010%~0.03%, Als:0.010%~0.04%, surplus is Fe and inevitably is mingled with, the Pcm maximum value is 0.195%, and the Ceq maximum value is 0.418%.
4, according to the production method of each described a kind of thick steel plate with high strength and low welding crack sensitivity in the claim 1~3, it is characterized in that, adopt molten iron to give treatment technology, converter smelting, the vacuum treated Clean Steel technology of LF stove+VD stove is smelted, continuous casting, and its rolling technology step is as follows:
A) Heating temperature before the hot rolling:
Billet heating temperature must guarantee to be lower than 1000 ℃, does not the highlyest surpass 1200 ℃, and the steel billet tapping temperature is 1150~1180 ℃;
B) rolling condition:
Rolling technology adopts austenite perfect recrystallization district+two the stage controlled rollings in austenite non-recrystallization district technology after the steel billet soaking;
The austenite recrystallization district is rolling: the fs of controlled rolling, temperature range is between 1100~970 ℃, for guaranteeing base metal tenacity and avoid producing the thick crystal grain of local anomaly that should make the single pass draft greater than 8%, maximum single pass draft is 20%;
Austenite non-recrystallization district is rolling: the subordinate phase of controlled rolling, temperature range is controlled at≤and 930 ℃, for thereby the effect that guarantees grain refining reaches yield strength and the flexible purpose that improves steel, should guarantee cumulative deformation 〉=55% in this stage, the cumulative maximum deflection is 65%;
C) online laminar flow cooling, i.e. direct quenching:
After hot rolling finishes, the steel plate of temperature more than Ar3 forced cooling, cooling is carried out in the ACC device, should make water be applied on the steel plate equably when forcing cooling, the water temp of going into of steel plate is 745~780 ℃, laminar flow cooling roller bed speed 0.5~0.9m/s, the final cooling temperature of steel plate is controlled at 420~500 ℃ of intervals; The speed of cooling of steel plate is controlled at 5~13 ℃/s interval, the speed of cooling at thickness of slab 1/2 place at least 1 ℃/more than the s;
D) temper: tempering temperature is at 610~630 ℃.
CNB2005100471960A 2005-09-12 2005-09-12 Thick steel plate with high strength and low welding crack sensitivity and its production process CN100516270C (en)

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CN110193678A (en) * 2019-06-24 2019-09-03 大唐郓城发电有限公司 A kind of heat resisting steel plate soldering method

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