CN100588734C - High-strength shipbuilding section and production method thereof - Google Patents
High-strength shipbuilding section and production method thereof Download PDFInfo
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- CN100588734C CN100588734C CN200710192423A CN200710192423A CN100588734C CN 100588734 C CN100588734 C CN 100588734C CN 200710192423 A CN200710192423 A CN 200710192423A CN 200710192423 A CN200710192423 A CN 200710192423A CN 100588734 C CN100588734 C CN 100588734C
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011572 manganese Substances 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 239000010955 niobium Substances 0.000 claims abstract description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 239000010936 titanium Substances 0.000 claims abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 239000011733 molybdenum Substances 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 54
- 229910052742 iron Inorganic materials 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 229910052698 phosphorus Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000003672 processing method Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 7
- 239000004615 ingredient Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 abstract description 18
- 239000000203 mixture Substances 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 238000009849 vacuum degassing Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 229910000640 Fe alloy Inorganic materials 0.000 description 3
- 229910000592 Ferroniobium Inorganic materials 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 108010038629 Molybdoferredoxin Proteins 0.000 description 2
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 206010012186 Delayed delivery Diseases 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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Abstract
The invention discloses a high strength ship plate and a production method thereof, and the mass percents of the main chemical compositions of the high strength ship plate are that: carbon is equal to0.05 percent to 0.10 percent, silicon is equal to 0.30 percent to 0.50 percent, manganese is equal to 1.20 percent to 1.60 percent, P is less than or equal to 0.02 percent, sulfur is less than or equal to 0.010 percent, niobium is equal to 0.02 percent to 0.05 percent, titanium is equal to 0.008 percent to 0.02 percent, aluminum is equal to 0.02 percent to 0.06 percent, nickel is equal to 0.0 percent to 0.40 percent, chromium is equal to 0 percent to 0.70 percent, molybdenum is equal to 0 percent to 0.60 percent, copper is equal to 0 percent to 0.70 percent, vanadium is equal to 0.0 percent to 0.05 percent, nitrogen is less than or equal to 0.008 percent. The production process flow is: preparation of raw materials (1), bessemerizing (2), LF refining (3), VD vacuum degassing (4), continuous casting (5), furnace heating (6), rough rolling (7), precision rolling (8), AGC cooling control (9) and finishing warehousing (10).
Description
Technical field
The present invention relates to a kind of special rolling-mill section and smelting process thereof, particularly relate to a kind of high-strength shipbuilding section and production method thereof that under cold condition, still has good mechanical properties.
Background technology
Development along with marine technology, boats and ships develop towards maximization, lightness, high speed direction, and the exploitation in marine oil gas field, the common intensity ship plate can not satisfy the needs of hull, and high-strength shipbuilding section has the characteristics of high strength, high tenacity, adapted to the specification of quality of modern ships fully to maximization, lightness, high speed development, therefore the ratio of high-strength shipbuilding section is listed as continuous lifting, it is predicted, to bring up to about 30% by present 10%, therefore developing serial high-strength shipbuilding section has vast market prospect.
For guaranteeing the security and the reliability of boats and ships, various countries surveying society has made strict regulation to chemical ingredients, mechanical property and the condition of delivery of the high-strength shipbuilding section of different size, the trade mark.Requiring yield strength to be not less than on the basis of 400MPa as the F40 deck of boat, also require its-60 ℃ of vertical V-type ballistic works to be not less than 41J,-20 ℃ of horizontal V-type ballistic works are not less than 27J, require the steel plate of each trade mark to have good welding property and sea water corrosion resistant simultaneously.
The high-strength shipbuilding section kind of domestic production at present mainly requires relatively low A32, A36, D32, D36 based on quality scale, its yield strength is up to 355Mpa, tensile strength 490Mpa, low-temperature impact toughness can only be protected-20 ℃, production technique adopts electrosmelting mostly, and needs could deliver goods after the normalizing thermal treatment, has increased the production cost of high-strength shipbuilding section greatly, simultaneously also delayed delivery date, seriously restricted high-strength shipbuilding section scale operation and met the need of market.And for the F40 kind that requires high strength and high tenacity simultaneously, the domestic maturation process of never finding out more can not be realized producing in batches.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide a kind of yield strength more than 400Mpa, more than the tensile strength 530Mpa, low temperature-60 ℃ impelling strength 〉=120J can satisfy the high-strength shipbuilding section and the production method thereof of 50～200kJ/cm large-line energy requirement of welding.
Purpose of the present invention is achieved by following technical proposals:
High-strength shipbuilding section: comprise alloying element, iron surplus and unavoidable impurities, the chemical component weight per-cent of alloying element is: carbon=0.05%～0.10%, silicon=0.30～0.50%, manganese=1.20%～1.60%, phosphorus≤0.02%, sulphur≤0.010%, niobium=0.02%～0.05%, titanium=0.008～0.02%, aluminium=0.02%～0.06%, nickel=0.0～0.40%, chromium=0～0.70%, molybdenum=0～0.60%, copper=0～0.70%, vanadium=0.0～0.05%, nitrogen≤0.008%.
The high-strength shipbuilding section production method: comprise that raw material is prepared and the finished product warehouse-in, the technical process between raw material preparation and finished product warehouse-in is: converter smelting, LF refining, VD vacuum outgas, continuous casting, process furnace heating, roughing, finish rolling and ACC control are cold.
Described LF purified processing method: refining temperature=1500～1650 ℃, refining time 〉=35 minute, the chemical ingredients fine setting, omnidistance Argon stirs, slag making deoxidation, refining slag basicity CaO/SiO2≤5.0.The processing method of described VD vacuum outgas: under the working vacuum degree condition of 0.5tor, kept vacuum time 15～25 minutes, molten steel is carried out denitrogenation, hydrogen, oxygen processing, nitrogen content≤45PPm in the departures molten steel, hydrogen richness≤2.5PPm, oxygen level≤30PPm.The processing method of described process furnace heating: Heating temperature is between 1170 ℃～1250 ℃, the 220mm thickness slab requires heat-up time 〉=3 hours 30 minutes, soaking time 〉=30 minute, 260mm thickness slab require heat-up time 〉=4 hour, soaking time 〉=40 minute.The processing method that described ACC control is cold: speed of cooling=5～15 ℃/S, final cooling temperature=600～680 ℃.
Compared with prior art, the present invention has the following advantages: under cold condition, still have good mechanical property, and good welding performance, the finished product steel plate does not need thermal treatment just can directly use.Be suitable for making novel ship and offshore platform.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Among the figure: the 1-raw material is prepared, the 2-converter smelting, and the 3-LF refining, the 4-VD vacuum outgas, the 5-continuous casting, the heating of 6-process furnace, the 7-roughing, 8-finish rolling, the 9-ACC control is cold, 10-finished product warehouse-in.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
The present invention includes alloying element, iron surplus and unavoidable impurities, the chemical component weight per-cent of alloying element is: carbon=0.05%～0.10%, silicon=0.30～0.50%, manganese=1.20%～1.60%, phosphorus≤0.02%, sulphur≤0.010%, niobium=0.02%～0.05%, titanium=0.008～0.02%, aluminium=0.02%～0.06%, nickel=0.0～0.40%, chromium=0～0.70%, molybdenum=0～0.60%, copper=0～0.70%, vanadium=0.0～0.05%, nitrogen≤0.008%.
With reference to accompanying drawing:
Technical process of the present invention is: raw material prepares 1, converter smelting 2, LF refining 3, VD vacuum outgas 4, continuous casting 5, process furnace heating 6, roughing 7, finish rolling 8, ACC control cold 9 and finished product warehouse-in 10.
Described raw material is prepared 1 processing method: routine operation.
The processing method of described converter smelting 2: add molten iron and steel scrap in the converter steelmaking process, molten iron and steel scrap proportioning are 85%～95%: 5%～15%; Add iron alloy ferrosilicon: Si 〉=72.0% then, Mn≤0.5%, S≤0.02%, P≤0.04%, C≤0.2%, Cr≤0.5%, iron surplus; Ferromanganese: Si≤1.5%, Mn 〉=78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron surplus; Ferrotianium: 25.0%≤Ti≤35.0%, Al≤8.0%, Si≤4.50%, Mn≤2.50%, P≤0.05%, S≤0.03%, C≤0.10%, Cu≤0.40%, iron surplus; Ferro-niobium: carbon≤0.05%, niobium 60～70%, silicon≤2%, aluminium≤2.5%, iron surplus; Ferro-aluminum: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron surplus; Ferrochrome: Cr 〉=60.0%, C≤2.0%, Si≤2.5%, P≤0.04%, S≤0.03%, iron surplus; Nickel plate: nickel 99.9%～100%, impurity surplus; Vanadium iron: 0.0～0.05%; Add the complex deoxidization alloy at last: aluminium ferromanganese: Si≤2.0%, 30.0%≤Mn≤35.0%, S≤0.05%, P≤0.20%, C≤2.0%, 20.0%≤Al≤26.0%, Cu≤0.5%, Fe surplus; Sial barium: Si 〉=35.00%, Al 〉=12.00%, Ba 〉=18.00%, Al+Ba 〉=30.00%, P≤0.05%, S≤0.10%.
The processing method of described LF stove refining 3: refining temperature: 1500～1650 ℃; Trimming, the slag making deoxidation, refining time 〉=35min, omnidistance Argon stirs, refining slag basicity CaO/SiO2≤5.0; Chemical ingredients is finely tuned, make it reach the internally controlling requirement of steel.
The processing method of described VD stove vacuum outgas 4: under the working vacuum degree condition of 0.5tor, keep vacuum time 15～25min, molten steel is carried out denitrogenation, hydrogen, oxygen processing, make departures molten steel nitrogen content≤45PPm, hydrogen richness≤2.5PPm, oxygen level≤30PPm increases substantially the molten steel purity.
The processing method of described continuous casting 5: adopt the whole process protection cast, carry out continuous casting at 1520～1550 ℃.
The processing method of described process furnace heating 6: the process furnace Heating temperature is between 1170 ℃～1250 ℃, the 220mm thickness slab requires heat-up time 〉=3 hours 30 minutes, soaking time 〉=30 minute, 260mm thickness slab require heat-up time 〉=4 hour, soaking time 〉=40 minute.
The processing method of described roughing 7: start rolling temperature 〉=1000 ℃, the single pass draught requires 〉=7%.
The processing method of described finish rolling 8: start rolling temperature≤900 ℃, accumulative total draught 〉=25% of last three passages, 790～850 ℃ of finish rolling finishing temperatures.
Described ACC is controlled cold 10 processing method: speed of cooling=5～15 ℃/S, final cooling temperature=600～680 ℃.
The processing method of described finished product warehouse-in 10: routine operation.
Embodiment 1:
Add molten iron and steel scrap in the converter steelmaking process, molten iron is 85%～95% to 5%～15% with the steel scrap proportioning; Add iron alloy ferrosilicon: Si 〉=72.0% then, Mn≤0.5%, S≤0.02%, P≤0.04%, C≤0.2%, Cr≤0.5%, iron surplus; Ferromanganese: Si≤1.5%, Mn 〉=78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron surplus; Ferrotianium: 25.0%≤Ti≤35.0%, Al≤8.0%, Si≤4.50%, Mn≤2.50%, P≤0.05%, S≤0.03%, C≤0.10%, Cu≤0.40%, iron surplus; Ferro-niobium: carbon≤0.05%, niobium 60～70%, silicon≤2%, aluminium≤2.5%, iron surplus; Molybdenum-iron: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron surplus; Nickel plate: nickel 99.9%～100%, impurity surplus; Add at last than classifying Si≤2.0%, 30.0%≤Mn≤35.0% as, S≤0.05%, P≤0.20%, C≤2.0%, 20.0%≤Al≤26.0%, Cu≤0.5%, Fe surplus complex deoxidization alloy aluminum ferromanganese is smelted.Through the refining of LF stove, refining temperature: 1500～1650 ℃; Trimming, the slag making deoxidation, refining time 〉=35min, omnidistance Argon stirs, and refining slag basicity CaO/SiO2 is 3.0; Chemical ingredients is finely tuned, make it reach the internally controlling requirement of steel; The vacuum outgas of VD stove is handled: under the vacuum of 0.5tor, keep vacuum time 20～25min, make departures molten steel hydrogen richness≤1.5PPm; Carry out continuous casting at 1520～1550 ℃, cast 260mm * 1860mm, 220mm * 2060mm slab.The process furnace Heating temperature is between 1200 ℃～1230 ℃; Roughing start rolling temperature 〉=1000 ℃, the single pass draught requires 〉=15%; Finish rolling start rolling temperature≤880 ℃, accumulative total draught 〉=45% of last three passages, 800～820 ℃ of finish rolling finishing temperatures, 5～8 ℃/S of ACC speed of cooling, 600～630 ℃ of final cooling temperatures.Adopt the high strength hull steel of above-mentioned explained hereafter, has tiny acicular ferrite+pearlitic structure, grain fineness number is controlled at 10～11 grades, organize grain fineness number difference to be controlled in 1.5 grades, mechanical property is even, and mechanical property reaches following index: yield strength 450Mpa, tensile strength 590Mpa, low-temperature impact toughness-60 ℃, the performance of Akv 240J can satisfy the superperformance of 100-200kJ/cm large-line energy welding.
Embodiment 2:
Add molten iron and steel scrap in the converter steelmaking process, molten iron is 85%～95% to 5%～15% with the steel scrap proportioning; Add iron alloy ferrosilicon: Si 〉=72.0% then, Mn≤0.5%, S≤0.02%, P≤0.04%, C≤0.2%, Cr≤0.5%, iron surplus; Ferromanganese: Si≤1.5%, Mn 〉=78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron surplus; Ferrotianium: 25.0%≤Ti≤35.0%, Al≤8.0%, Si≤4.50%, Mn≤2.50%, P≤0.05%, S≤0.03%, C≤0.10%, Cu≤0.40%, iron surplus; Ferro-niobium: carbon≤0.05%, niobium 60～70%, silicon≤2%, aluminium≤2.5%, iron surplus; Molybdenum-iron: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron surplus; Ferrochrome: Cr 〉=60.0%, C≤2.0%, Si≤2.5%, P≤0.04%, S≤0.03%, iron surplus; Add at last than classifying Si 〉=35.00% as, Al 〉=12.00%, Ba 〉=18.00%, Al+Ba 〉=30.00%, P≤0.05%, the complex deoxidization alloy sial barium of S≤0.10% is smelted, and passes through the refining of LF stove, refining temperature: 1500～1650 ℃; Trimming, the slag making deoxidation, refining time 〉=35min, omnidistance Argon stirs, and refining slag basicity CaO/SiO2 is 4.0; Chemical ingredients is finely tuned, make it reach the internally controlling requirement of steel; The vacuum outgas of VD stove is handled: under the vacuum of 0.5tor, keep vacuum time 15～22min, make departures molten steel hydrogen richness≤2.0PPm; Carry out continuous casting at 1520～1550 ℃.Cast 260mm * 1860mm, 220mm * 2060mm slab.The process furnace Heating temperature is between 1170 ℃～1200 ℃; Roughing start rolling temperature 〉=1000 ℃, the single pass draught requires 〉=11%; Finish rolling start rolling temperature≤1000 ℃, accumulative total draught 〉=35% of last three passages, 820～840 ℃ of finish rolling finishing temperatures, 8～10 ℃/S of ACC speed of cooling, 630～650 ℃ of final cooling temperatures.
Adopt the high-strength shipbuilding section of above-mentioned explained hereafter, have tiny acicular ferrite and pearlitic structure, grain fineness number is controlled at 9～10 grades, organize grain fineness number difference to be controlled in 1.5 grades, mechanical property is even, and mechanical property reaches following index: yield strength 455Mpa, tensile strength 600Mpa, low-temperature impact toughness-60 ℃, the performance of Akv 165J can satisfy the superperformance of 50～150kJ/cm large-line energy welding.
Claims (1)
1. high-strength shipbuilding section production method, the chemical ingredients mass percent of described high-strength shipbuilding section is: carbon=0.05%～0.10%, silicon=0.30～0.50%, manganese=1.20%～1.60%, phosphorus≤0.02%, sulphur≤0.010%, niobium=0.02%～0.05%, titanium=0.008～0.02%, aluminium=0.02%～0.06%, nickel=0.0～0.40%, chromium=0～0.70%, molybdenum=0～0.60%, copper=0～0.70%, vanadium=0.0～0.05%, nitrogen≤0.008%, iron surplus and unavoidable impurities, the production method of the above-mentioned high-strength shipbuilding section of described preparation is: comprise raw material preparation (1), converter smelting (2), LF refining (3), VD vacuum outgas (4), continuous casting (5), process furnace heating (6), roughing (7), finish rolling (8), ACC control cold (9) and finished product warehouse-in (10); The processing method of described LF refining (3): refining temperature=1500～1650 ℃, refining time 〉=35 minute, the chemical ingredients fine setting, omnidistance Argon stirs, slag making deoxidation, refining slag basicity CaO/SiO
2≤ 5.0; It is characterized in that:
The processing method of described VD vacuum outgas (4): under the working vacuum degree condition of 0.5tor, kept vacuum time 15～25 minutes, molten steel is carried out denitrogenation, hydrogen, oxygen processing, nitrogen content≤45ppm in the departures molten steel, hydrogen richness≤2.5ppm, oxygen level≤30ppm;
The processing method of described process furnace heating (6): Heating temperature is between 1170 ℃～1250 ℃, the 220mm thickness slab requires heat-up time 〉=3 hours 30 minutes, soaking time 〉=30 minute, 260mm thickness slab require heat-up time 〉=4 hour, soaking time 〉=40 minute;
The processing method of described ACC control cold (9): speed of cooling=5～15 ℃/S, final cooling temperature=600～680 ℃.
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