CN107299289B - Polar region ice-breaking cargo ship structural steel and manufacturing method - Google Patents
Polar region ice-breaking cargo ship structural steel and manufacturing method Download PDFInfo
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- CN107299289B CN107299289B CN201710439199.1A CN201710439199A CN107299289B CN 107299289 B CN107299289 B CN 107299289B CN 201710439199 A CN201710439199 A CN 201710439199A CN 107299289 B CN107299289 B CN 107299289B
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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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Abstract
The invention discloses a kind of polar region ice-breaking cargo ship structural steel and preparation methods, it is characterized by: the chemical element component and its weight percent that contain are as follows: carbon 0.11~0.25%, silicon 0.61~1.25%, manganese 0.10~0.39%, phosphorus≤0.008%, sulphur≤0.001%, chromium 0.35~0.89%, titanium 0.11~0.20%, nitrogen≤0.003%, surplus are iron and inevitable impurity.Structural steel yield strength >=500MPa, Cold Brittleness Transition Temperature≤- 70 DEG C, the polar region ice-breaking cargo ship comprehensive performance of construction is good, voyage can not only be shortened, and it is highly-safe, overcome that low temperature ship is unable to ice-breaking in the prior art and ice breaker does not have the defect of large cargo transport capacity, it is significant for the ocean shipping of China arctic.
Description
Technical field
The invention belongs to marine high strength steel manufacturing fields, and in particular to a kind of polar region ice-breaking cargo ship structural steel and manufacture
Method.
Background technique
South Pole Arctic is resourceful, exploits and transport these resources with regard to low temperature ship.China is through arctic navigation channel to west
The ocean voyage of Northern Europe and north america is than through the Gulf of Aden voyage few 15 days or so, moreover, conveying liquified, naturally to make the arctic leave with rage low
It is safer that warm navigation channel ratio walks equator sea route, remarkable benefit.Polar region navigation channel ship is low in addition to environment temperature, also by the impact of ice cube
And destruction of wave, hurricane or so.It is therefore desirable to which Ship Structure steel has yield strength >=500MPa high-intensitive and cold
Crisp transition temperature is lower than -70 DEG C of low-temperature flexibility, will not lead to brittle fracture because of low temperature in this way.In addition, ship is by cold ground
Area further encounters thick ice sea area, and therefore, polar low-temperature ship it is also desirable to have certain ice-breaking capacity, and ship is needed with structural steel
It is built using high strength steel.
Chinese invention patent application CN201610587965.4 disclose it is a kind of can Large Heat Input Welding polar region hull steel
Plate and preparation method thereof, chemical component be C0.03~0.07%, Si0.15~0.30%, Mn1.10~1.50%, P≤
0.0070%, S≤0.0030%, Ti0.008~0.020%, N0.0030~0.0060%, Cu0.10~0.30%, Ni0.10
~0.40%, Nb0.010~0.040%, Al0.020~0.050%, surplus Fe, steel matrix tissue are ferrite+pearly-lustre
Body, for medium pearlite Dispersed precipitate between ferrite crystal grain, ferrite grain size is 4~8um.Steel have it is excellent-
60 DEG C, -80 DEG C of low-temperature impact toughness, but the deficiency of the application for a patent for invention is, using the chemical component and preparation method system
The steel yield strength made is relatively low, is easy to happen surrender during ice-breaking, cannot plough the ice.
Chinese invention patent CN201210271624.8 discloses " High-strength high-tenacity steel for ship structure ", chemical component
Are as follows: C:0.015~0.10%, Si:0.005~0.6%, Mn:0.4~2.50%, P≤0.015%, S≤0.01%, Nb:
0.003~0.12%, Ti:0.003~0.02%, Al≤0.06%, N:0.001~0.006%, B:0.0005~
0.0025%, O≤0.008%, Zr:0.001~0.10%, surplus are Fe and inevitable other impurity elements, wherein C,
B, Ti, N meet C+10B=0.05-0.11, the requirement of Ti/N > 3.The manufacturing method of the steel plate includes: continuous casting steel billet hot rolling,
Wherein slab heating temperature: 1100~1200 DEG C, recrystallization zone rolling temperature: 920~1130 DEG C, non-recrystallization zone rolling temperature
Degree: 880~730 DEG C, termination cooling temperature: 200~550 DEG C, cooling velocity: 3~25 DEG C/s.Obtained steel plate yield strength >=
355MPa, tensile strength >=490MPa, -40 DEG C of low-temperature impact works are greater than 120J.Using the steel plate surrender of patented technology manufacture
Intensity is only 355MPa, and -40 DEG C of low-temperature impact works are greater than 120J, but are not suitable for the construction of polar region ice-breaking cargo ship.
The superelevation that Chinese invention patent application CN201210559488.2 discloses a kind of low-temperature resistance strain-age brittleness is strong
Spend the deck of boat and its production method, chemical component are as follows: C0.04%~0.08%, Si0.15%~0.45%, Mn0.8%~
1.2%, P0.005%~0.015%, S≤0.005%, Al0.02%~0.08%, N≤0.005%, there are also Cu0.05%~
0.50%, Ni0.05%~0.40%, V0.02%~0.10%, Nb0.005%~0.05%, Ti0.005%~0.05%,
It is two or more in Ca0.0005%~0.006%.1100~1150 DEG C of slab heating temperature, recrystallization zone start rolling temperature 1050
~1100 DEG C, 880~940 DEG C of finishing temperature, cumulative deformation >=60%, air-cooled to 810~840 DEG C beginning Unhydrated cements roll
System, 780~820 DEG C of finishing temperature, cumulative deformation >=50%；Roll rear section cooling, 8~15 DEG C/s of cooling rate, red temperature 550
~640 DEG C.But the application for a patent for invention deficiency is, polar region thickness ice larger using the steel internal stress of cooling controlling and rolling controlling process manufacture
There are risk of breakage during sea area ice-breaking navigation.
Chinese invention patent CN201210031780.7 discloses Ni system low-temperature steel and manufacturing method, LNG tank
With transport hull peculiar to vessel, the ingredient of steel are as follows: C:0.02~0.10%, Si:0.01~0.20%, Mn:0.50~0.75%, P :≤
0.010%, S :≤0.004%, Ni:8.50~9.50%, Al:0.005~0.040%, Ti:0.005~0.040%, O:
0.0005~0.003%, N:0.0010~0.012%, Ca:0.0005~0.004%, Cu:0.001~1.50%, Mo:
0.001~0.16%, surplus Fe.It is refined using BOF (or EAF) smelting+LF+VD (or RH) refinery practice；Using secondary cooling zone
Weak cold+stable low pulling rate technique cooperation carries out the continuous casting of steel；The rolling of steel is carried out using low-temperature heat+controlled rolling technology,
And in the above direct quenching of Ar3 temperature；Steel is heat-treated using critical hardening+tempering process.Through low-temperature impact, NDT,
The experiments such as DT, CTOD, K1a detection was proved according to the advantages of Ni system low temperature Steel material of the present invention: having good obdurability
Match, is more than 2 × 105m suitable for manufacture capacity3, thickest be more than ultra-large type 50mm, high to security requirement
LNG storage tank.The patent of invention is related to typical 9Ni steel, and production technology is complicated, and at high cost, steel strength is low, it is impossible to be used in builds broken
Ice boat body.
Summary of the invention
Present invention aim to provide a kind of polar region ice-breaking cargo ship structural steel and manufacturing method, overcome existing
Skill hypothermia ship is unable to ice-breaking and ice breaker does not have the defect of large cargo transport capacity.
To achieve the above object, the technical solution adopted by the present invention is that: polar region ice-breaking cargo ship structural steel, the change contained
Learn elemental composition and its weight percent are as follows: carbon 0.11~0.25%, silicon 0.61~1.25%, manganese 0.10~0.39%, phosphorus≤
0.008%, sulphur≤0.001%, chromium 0.35~0.89%, titanium 0.11~0.20%, nitrogen≤0.003%, surplus are iron and can not
The impurity avoided.
Further, the carbon is preferably 0.15~0.23%.
Further, the silicon is preferably 0.61~0.88%.
Further, the manganese is preferably 0.17~0.25%.
Further, the chromium is preferably 0.35~0.55%.
Further, the titanium is preferably 0.18~0.20%.
Polar region sea area temperature is low, hurricane is strong, wave is big, ice sheet is thick, and hull knot is transported in the ice-breaking navigated by water in the harsh environment
Structure requires good low-temperature flexibility and high intensity, and steel used require corresponding toughness and intensity index, avoid that accident occurs.
C (carbon): 0.11~0.25%, for the steel for obtaining some strength, suitable alloying element C is added, in addition to solid solution
Except reinforcing, also precipitated phases such as Ti (CN) can be formed with Ti, further increase intensity.
Si (silicon): 0.61~1.25%, silicon addition is added in steel, improves steel strength to replace solid solution mode, especially
It is remarkably improved yield strength.
P (phosphorus), S (sulphur): for impurity harmful element, reducing steel product quality and toughness, and the lower P, S content the better in steel, but
If it is too low to control content, production technology cost is caused to increase, sets P :≤0.008%, S≤0.001%.
Cr (chromium): 0.35~0.89%, appropriate Cr is added in steel, is reduced case temperature, is conducive to controlled rolling and finish rolling
Control is cooling to obtain expected heterogeneous microstructure and comprehensive mechanical property afterwards.
Ti (titanium): 0.11~0.20%, the Ti and C and surplus N that certain content is added in steel form precipitated phase Ti (CN), and one
The fixed free N of aspect, reduces steel timeliness tendency, and on the other hand, tiny precipitated phase can contain that crystal grain is grown up, and refines crystal grain,
The toughness of intensity is improved simultaneously, and there are also the effects of precipitation strength, further increase intensity.
The manufacturing method of ice-breaking cargo ship structural steel in polar region as described above, comprising the following steps:
1) it smelts, cast
It is uniformly mixed by the ingredient and weight percent and forms molten iron, then handled molten iron through deep de- S, pneumatic steelmaking
Process, except P is handled, then with RH vacuum system refined molten steel, is finally cast as slab using de- P agent；
2) it rolls
It is rolled into steel plate in two stages, slab cross rolling at finished steel plate width dimensions, is then carried out by the first rank
Two-stage rolling, finished steel plate thickness is longitudinally rolled into along slab；
3) cooling
400~620 DEG C are cooled under 10~20 atmospheric air environment after rolling, finally in sand pit slow cooling to room temperature shape
At required steel plate, it is therefore intended that precipitated phase is precipitated sufficiently, the purpose of sand pit slow cooling is to eliminate portion of residual stress, so that system
Obtain yield strength >=500MPa, Cold Brittleness Transition Temperature≤- 70 DEG C of steel.
Further, in the step 3), 460~510 DEG C are cooled under 10~20 atmospheric air environment after rolling.
Compared with prior art, the invention has the following advantages that structural steel yield strength >=500MPa of the invention, cold
The polar region ice-breaking cargo ship comprehensive performance of crisp transition temperature≤- 70 DEG C, construction is good, can not only shorten voyage, but also safety
Height, overcomes that low temperature ship is unable to ice-breaking in the prior art and ice breaker does not have the defect of large cargo transport capacity, for China
The shipping of arctic ocean is significant.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, convenient for more clearly understanding the present invention, but it
Limiting the invention.
According to the when production method requirement of chemical element component of the present invention, weight percent, five embodiments are prepared for, and
Two comparative examples, respectively embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, comparative example 1, comparison
Embodiment 2 smelts and has rolled 7 batches of steel plates.The chemical element component weight hundred of five embodiments and two comparative examples
Ratio is divided to be shown in Table 1, wherein surplus is Fe and inevitable impurity.Production process control parameter and plate quality situation are shown in Table 2.
The chemical component of 1 five embodiments of table and two comparative examples compares (wt%)
2 five embodiments of table and two comparative example production process controls and plate property situation
As can be seen from Table 2,550MPa, cold short transformation temperature are above by the steel yield strength that present component and technique produce
Degree is below -70 DEG C.Without the compared steel surrender in composition of steel range of the present invention or/and production technology not within the scope of the present invention
Intensity is only 516MPa, 492MPa, and Cold Brittleness Transition Temperature is respectively -17 DEG C, -20 DEG C.
Claims (7)
1. a kind of manufacturing method of polar region ice-breaking cargo ship structural steel, it is characterised in that: polar region ice-breaking cargo ship structural steel
The chemical element component and its weight percent contained are as follows: carbon 0.11~0.25%, silicon 0.61~1.25%, manganese 0.10~
0.39%, phosphorus≤0.008%, sulphur≤0.001%, chromium 0.35~0.89%, titanium 0.11~0.20%, nitrogen≤0.003%, surplus
For iron and inevitable impurity；Manufacturing method the following steps are included:
1) it smelts, cast
It is uniformly mixed by the ingredient and weight percent and forms molten iron, then handled molten iron through deep de- S, convertor steelmaking process
Using de- P agent except P processing, then with RH vacuum system refined molten steel, finally it is cast as slab；
2) it rolls
It is rolled into steel plate in two stages, slab cross rolling at finished steel plate width dimensions, is then carried out second-order by the first rank
Section rolling, finished steel plate thickness is longitudinally rolled into along slab；
3) cooling
400~620 DEG C are cooled under 10~20 atmospheric air environment after rolling, finally forms institute in sand pit slow cooling to room temperature
Need steel plate.
2. the manufacturing method of the polar region ice-breaking cargo ship structural steel according to claim 1, it is characterised in that: the step
It is rapid 3) in, be cooled to 460~510 DEG C under 10~20 atmospheric air environment after rolling.
3. the manufacturing method of the polar region ice-breaking cargo ship structural steel according to claim 1, it is characterised in that: the carbon
Preferably 0.15~0.23%.
4. the manufacturing method of the polar region ice-breaking cargo ship structural steel according to claim 1, it is characterised in that: the silicon
Preferably 0.61~0.88%.
5. the manufacturing method of the polar region ice-breaking cargo ship structural steel according to claim 1, it is characterised in that: the manganese
Preferably 0.17~0.25%.
6. the manufacturing method of the polar region ice-breaking cargo ship structural steel according to claim 1, it is characterised in that: the chromium
Preferably 0.35~0.55%.
7. the manufacturing method of the polar region ice-breaking cargo ship structural steel according to claim 1, it is characterised in that: the titanium
Preferably 0.18~0.20%.
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| CN102851591B (en) * | 2011-06-28 | 2016-01-13 | 鞍钢股份有限公司 | High-strength high-toughness low-temperature steel for ships and manufacturing method thereof |
| US9982331B2 (en) * | 2012-09-19 | 2018-05-29 | Jfe Steel Corporation | Abrasion resistant steel plate having excellent low-temperature toughness and excellent corrosive wear resistance |
| CN104711483B (en) * | 2015-03-31 | 2018-01-12 | 武汉钢铁有限公司 | A kind of stable Marine Engineering Steel of metallographic structure and production method |
| JP2016199778A (en) * | 2015-04-07 | 2016-12-01 | 株式会社神戸製鋼所 | Steel material and method for producing the steel material |
| CN106148819B (en) * | 2016-06-24 | 2017-11-21 | 南阳汉冶特钢有限公司 | A kind of high-tensile structural steel S690QL1 cut deals and its production method |
| CN106467951B (en) * | 2016-09-12 | 2019-06-18 | 武汉钢铁有限公司 | For -70 DEG C of high intensity, high tenacity, low yield strength ratio low-temperature steel and its manufacturing method |
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