CN106435368B - A kind of production method of anti-delayed fracture ultrahigh-strength steel plates - Google Patents
A kind of production method of anti-delayed fracture ultrahigh-strength steel plates Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21C7/06—Deoxidising, e.g. killing
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- 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
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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Abstract
A kind of production method of anti-delayed fracture ultrahigh-strength steel plates, the production process route of steel is molten iron pretreatment → converter smelting → LF external refinings → VD vacuum processings → continuous casting → heating → rolling → quenching → tempering → finishing → service check → flaw detection, it is characterised in that：The chemical composition percentage composition of steel is：C=0.14~0.20,Si=0.15~0.35,Mn=1.0~1.50,P≤0.015,S≤0.003,Nb=0.020~0.040,V=0.040~0.070,Ti=0.010~0.025,Als=0.020~0.045,Cr=0.10~0.60,Mo=0.30~0.70,Ni=0.20~0.50,B=0.0008~0.0025,CEV≤0.53,Surplus is Fe and other trace elements,Gas content H≤0.0002%,N≤0.005%,The produced steel plate of O≤0.0015%. the method for the present invention is before gas flame cuttiug and plasma cut without preheating,Heat preservation or rear heat are not required to after cutting,Quality of cut face is good,Dye penetrant inspection zero-fault.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of production method of anti-delayed fracture ultrahigh-strength steel plates.
Background technology
As engineering machinery is to big quantization and lightweight development, super-high strength steel is used widely.At present in the world
Super-high strength steel carbon equivalent is high, and cold cracking inclination is big, and the pre-heat treatment is required before cutting stock, and capping thermal insulating material is generally taken after cutting
Material heat preservation avoids generating cold crack by stress-relieving by beat treatment.Heat treatment can increase the energy after preheating, cutting before cutting
Consumption and production cost；Meanwhile the increase of manufacturing procedure, the production efficiency of enterprise is produced bigger effect.
For energy saving cost, production efficiency is improved, part construction machinery production enterprise saves before cutting stock to be added
Thermal process does not keep the temperature after cutting or is not heat-treated, and causes to cut face colouring or magnetic powder inspection does not conform to, defect is steel plate thickness direction
Micro-crack at 1/2, crackle is more straight, and typical stress cracking feature is presented.The reason of generating this defect has：First, steel
There is the defect for causing stress concentration, such as non-metallic inclusion, loose and stomata in plate；Second, internal stress is big：Carbon equivalent high
Unimach in heating and cooling because of the thermal stress that the asynchronous generation expanded with heat and contract with cold is larger, geneva occurs for cooling procedure
Stress concentration is generated at the defects of body and bainitic transformation generate transformation stress, both stress are mingled in steel plate, works as stress
It then cracks when more than its tensile strength, this crack depth need to carry out polishing and remedy, cause generally between 0.5-1mm
The consequences such as process cost increases or even part is scrapped.
To meet the market requirement, meets the harsh use condition of client, Molten Steel Cleanliness need to be improved, reduce material internal and lack
It falls into, to improve material anti-delayed fracture performance.The present invention reduces from composition design generates cold cracking inclination, passes through rational essence
Sweetening process controls field trash, coordinates rationally rolling and heat treatment technics, produces with good anti-delayed fracture performance
Clean steel, and realize batch production.
Invention content
The present invention is intended to provide a kind of production method of anti-delayed fracture ultrahigh-strength steel plates, makes produced steel plate in flame
Without preheating before cutting and plasma cut, heat preservation or rear heat are not required to after cutting, quality of cut face is good, and dye penetrant inspection is intact
It falls into.
Technical scheme of the present invention：
A kind of production method of anti-delayed fracture ultrahigh-strength steel plates, the production process route of steel are：Molten iron pretreatment →
Converter smelting → LF external refinings → VD vacuum processings → continuous casting → heating → rolling → quenching → tempering → finishing → performance inspection
It tests → detects a flaw, it is characterised in that：The chemical composition percentage composition of steel is：C=0.14 ~ 0.20, Si=0.15~0.35, Mn=1.0~
1.50, P≤0.015, S≤0.003, Nb=0.020 ~ 0.040, V=0.040 ~ 0.070, Ti=0.010 ~ 0.025, Als=0.020
~0.045, Cr=0.10~0.60, Mo=0.30~0.70, Ni=0.20 ~ 0.50, B=0.0008 ~ 0.0025, CEV≤0.53,
Surplus is Fe and other trace elements, elemental gas content H≤0.0002%, N≤0.005%, O≤0.0015%；Including following work
Skill step：
（1）Enough silicomangan and aluminium alloy is added in converter tapping process, and carries out wash heat, tapping knot using synthetic slag
Aluminum steel is fed after beam, controls Als% >=0.040% in molten steel.
（2）LF smelting processes use CaO, CaC2、Al2O3Slag making, and by spreading aluminum shot to the top of the slag and feeding aluminum steel to molten steel
Deoxidation；Smelting process whole process Argon carries out big 5 ~ 10 min of argon gas strong mixing after making white slag；The outbound preceding feeding calcium line 100 of molten steel ~
200m；Als% >=0.060%, sulfur content≤0.005% are controlled at the end of LF smelts in molten steel.
（3）Molten steel whole blowing argon gas in VD vacuum process, keeps 12~20min, really under 50~70Pa pressure
Hydrogen content in molten steel is protected to control 0.0002% hereinafter, sulfur content≤0.003%；80~150m of calcium line, control are fed after vacuum breaker
Calcium sulfur ratio Ca/S >=1.2 keep 15~30min of soft blow state；
（4）During continuous casting, big packet long nozzle and submersed nozzle take argon gas-sealed, backpack cover plate in middle packet use
Completely cut off air with middle covering agent.
（5）At 1170~1250 DEG C, roughing start rolling temperature >=1070 DEG C, the operation of rolling uses two for slab heating temperature control
Stage big pressure rolling, roughing must assure that three percentage pass reductions are more than 20%；Finish rolling start rolling temperature 880~900 DEG C it
Between, finishing temperature is quickly cooled down after rolling by Mulpic between 800~850 DEG C, 30~35 DEG C/s of cooling rate, eventually cold temperature
200~350 DEG C of degree；
（6）Quenching：890~910 DEG C, the cool time is plate thickness mm × (1.8~2.1) min/mm, water cooling.
（7）Tempering：Shove charge is tempered in 24 hours after steel plate quenching；580~640 DEG C of temperature, tempering time is plate thickness
Mm × (2.0~2.5) min/mm, it is air-cooled.
The present invention is by technique adjustments such as converter smelting, LF refining and vacuum processings, ensureing Molten Steel Cleanliness, and pass through
The control of calcium sulfur ratio inhibits the precipitation of MnS during continuous casting and solidifying；Continuous casting low overheat, argon for protecting pouring, reasonable slighter compress
Use the slab for producing high quality；The big pressure of two benches rolls abundant crystal grain thinning；Steel plate high tempering fully disappears after quenching
De-stress.Final produced steel plate, without preheating, is not required to heat preservation or rear heat, cuts before gas flame cuttiug and plasma cut after cutting
Face quality is good, dye penetrant inspection zero-fault.So the present invention has the following advantages：Low-carbon-equivalent designs, and generates cold crack and inclines
To small；Plate blank coarse micro-grain is high-quality, C classes center segregation≤1.0 grade；Molten Steel Cleanliness is high, and thick system is mingled with grade≤0.5, thin system's folder
Miscellaneous grade≤1.0 grade, H≤0.0002, N≤0.005, O≤0.0015；Suitable rolling and heat treatment process, steel plate crystal grain are thin
Small, residual stress is small；It is not required to preheat before steel plate plasma cut or gas flame cuttiug, is not required to keep the temperature after cutting or is heat-treated, cutting
Face colouring flaw detection zero defect.
Description of the drawings
Fig. 1 is the not pre- thermal cutting dye penetrant inspection photo of common ultrahigh-strength steel plates.
Fig. 2 is the not pre- thermal cutting crack defect metallograph of common ultrahigh-strength steel plates.
Fig. 3 is plate blank coarse micro-grain photo.
Fig. 4 is 16mm anti-delayed fracture ultrahigh-strength steel plates dye penetrant inspection photos.
Fig. 5 is 50mm anti-delayed fracture ultrahigh-strength steel plates dye penetrant inspection photos.
Specific implementation mode
The content further illustrated the present invention with reference to embodiment.
Embodiment one：Refine 16mm ultrahigh-strength steel plates
The composition content mass percent of steel is：C=0.15, Si=0.28, Mn=1.35, P=0.011, S=0.0021, Nb=
0.030, V=0.055, Ti=0.020, Als=0.040, Cr=0.17, Mo=0.32, Ni=0.32, B=0.0018, CEV=0.51,
Surplus is Fe and other trace elements.Gas content：H=0.00015, N=0.0032, O=0.0012.
The production craft step of steel is：
（1）The deoxidation of silicomangan 2115kg and 212kg ferro-aluminum, 403kg lime, 105kg synthesis is added in converter tapping process
Slag, deoxidier and synthesis slag charge are initially added into tapping a quarter, and tapping is added to 3/4ths.Feed 230m's after tapping
Al lines, Als contents 0.045.
（2）Molten steel is smelted into LF stoves, lime and synthetic slag is added according to the 7.5kg/t quantity of slag, and 40kgCaC is added2With
100kgAl are diffused deoxidation, and initial smelting period~mid-term feeds 300m length Al lines, Als contents 0.065 in molten steel.LF smeltings
Refining latter stage feeds pure calcium line 150m, soft blow 10min, sulfur content 0.0045 in molten steel.
（3）Molten steel is vacuum-treated into VD, and whole blowing argon gas, keeps 15min, steel under 65Pa pressure in processing procedure
H content 1.5ppm in water；Sulfur content 0.0018；Calcium line 120m is fed after vacuum breaker, calcium sulfur ratio Ca/S=1.4 keep soft blow state
18min。
（4）12~15 DEG C of the continuous casting degree of superheat, whole argon for protecting pouring.
（5）Rolling：Steel slab, 1200 DEG C of heating temperature, 1090 DEG C of start rolling temperature, continuous three percentage pass reduction of roughing point
It Wei 20.7%, 22.6%, 24.5%.890 DEG C of finish rolling start rolling temperature, 840 DEG C of finishing temperature, 270 DEG C of final cooling temperature.
（6）Quenching：32min at a temperature of 890 DEG C, water cooling.
（7）Tempering：It is tempered after 0.5 hour after steel plate quenching, 35min at a temperature of 610 DEG C is air-cooled.
（8）Mechanical performance test such as table 1.
（9）Steel plate is according to GB/T2970 standards I grade of qualification of flaw detection；Gas flame cuttiug face colouring flaw detection zero-fault.
1 embodiment of table, one 16mm ultrahigh-strength steel plates mechanical performance detection datas
Embodiment two：Refine 50mm ultrahigh-strength steel plates
The composition content mass percent of steel is：C=0.14, Si=0.25, Mn=1.38, P=0.012, S=0.0018, Nb=
0.025, V=0.053%, Ti=0.022, Als=0.042, Cr=0.20, Mo=0.40, Ni=0.33, B=0.0017, CEV=0.52,
Surplus is Fe and other trace elements.Gas content：H=0.00013, N=0.0036, O=0.0009.
The production craft step of steel is with parameter：
（1）The deoxidation of silicomangan 2089kg and 215kg ferro-aluminum, 408kg lime, 110kg synthesis is added in converter tapping process
Slag, deoxidier and synthesis slag charge are initially added into tapping a quarter, and tapping is added to 3/4ths.Feed 220m's after tapping
Al lines, Als contents 0.042.
（2）Molten steel is smelted into LF stoves, lime and synthetic slag is added according to the 7.5kg/t quantity of slag, and 50kgCaC is added2With
90kgAl are diffused deoxidation, and initial smelting period~mid-term feeds 320m length Al lines, Als contents 0.061 in molten steel.LF smelts
Latter stage feeds pure calcium line 150m, soft blow 10min, sulfur content 0.003% in molten steel.
（3）Molten steel is vacuum-treated into VD, and whole blowing argon gas, keeps 15min, steel under 65Pa pressure in processing procedure
H content 1.3ppm in water；Sulfur content 0.0014%；Calcium line 105m is fed after vacuum breaker, calcium sulfur ratio Ca/S=1.3 keep soft blow shape
State 23min.
（4）10~13 DEG C of the continuous casting degree of superheat, whole argon for protecting pouring.
（5）Rolling：Steel slab, 1210 DEG C of heating temperature, 1090 DEG C of start rolling temperature, continuous three percentage pass reduction of roughing point
It Wei 20.1%, 20.8%, 22.3%.880 DEG C of finish rolling start rolling temperature, 835 DEG C of finishing temperature, 300 DEG C of final cooling temperature.
（6）Quenching：90min at a temperature of 890 DEG C, water cooling.
（7）Tempering：It is tempered after 2 hours after steel plate quenching, 610 DEG C, 100min, air-cooled.
（8）Mechanical performance test such as table 2.
（9）Steel plate is according to I grade of qualification of GB/T2970 standard ultrasounds wave inspection；Gas flame cuttiug face colouring flaw detection zero-fault.
2 embodiment of table, two 50mm ultrahigh-strength steel plates mechanical performance detection datas
Claims (1)
1. a kind of production method of anti-delayed fracture ultrahigh-strength steel plates, the production process route of steel are：Molten iron pretreatment → turn
Stove smelting → LF external refinings → VD vacuum processings → continuous casting → heating → rolling → quenching → tempering → finishing → service check
→ flaw detection, it is characterised in that：The chemical composition percentage composition of steel is：C=0.14 ~ 0.20, Si=0.15~0.35, Mn=1.0~
1.50, P≤0.015, S≤0.003, Nb=0.020 ~ 0.040, V=0.040 ~ 0.070, Ti=0.010 ~ 0.025, Als=0.020
~0.045, Cr=0.10~0.60, Mo=0.30~0.70, Ni=0.20 ~ 0.50, B=0.0008 ~ 0.0025, CEV≤0.53,
Surplus is Fe and other trace elements, elemental gas content H≤0.0002%, N≤0.005%, O≤0.0015%；Including following work
Skill step：
（1）Enough silicomangan and aluminium alloy is added in converter tapping process, and carries out wash heat using synthetic slag, after tapping
Aluminum steel is fed, Als% >=0.040% in molten steel is controlled；
（2）LF smelting processes use CaO, CaC2、Al2O3Slag making, and it is de- by spreading aluminum shot to the top of the slag and feeding aluminum steel to molten steel
Oxygen；Smelting process whole process Argon carries out big 5 ~ 10 min of argon gas strong mixing after making white slag；The outbound preceding feeding calcium line 100 of molten steel ~
200m；Als% >=0.060%, sulfur content≤0.005% are controlled at the end of LF smelts in molten steel；
（3）Molten steel whole blowing argon gas in VD vacuum process, keeps 12~20min, it is ensured that steel under 50~70Pa pressure
Hydrogen content is controlled 0.0002% hereinafter, sulfur content≤0.003% in water；80 ~ 150m of calcium line is fed after vacuum breaker, controls calcium sulfur ratio
Ca/S >=1.2 keep 15~30min of soft blow state；
（4）During continuous casting, big packet long nozzle and submersed nozzle take argon gas-sealed, and backpack cover plate is in middle packet use
Covering agent completely cuts off air；
（5）At 1170~1250 DEG C, roughing start rolling temperature >=1070 DEG C, the operation of rolling uses two benches for slab heating temperature control
Big pressure rolling, roughing must assure that three percentage pass reductions are more than 20%；Finish rolling start rolling temperature is between 880 ~ 900 DEG C, finish to gauge
Temperature is quickly cooled down after rolling by Mulpic between 800 ~ 850 DEG C, 30 ~ 35 DEG C/s of cooling rate, final cooling temperature 200 ~ 350
℃；
（6）Quenching：890~910 DEG C, the cool time is plate thickness mm × (1.8~2.1) min/mm, water cooling；
（7）Tempering：Shove charge is tempered in 24 hours after steel plate quenching；580~640 DEG C of temperature, tempering time be plate thickness mm ×
(2.0~2.5) min/mm, it is air-cooled.
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| CN107236901A (en) * | 2017-06-30 | 2017-10-10 | 合肥博创机械制造有限公司 | A kind of production technology of engineering machinery high strength steel |
| CN108359899A (en) * | 2018-03-27 | 2018-08-03 | 本钢板材股份有限公司 | A kind of super high strength construction steel BG960 and preparation method |
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