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 PDF

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CN106435368B
CN106435368B CN201611057390.1A CN201611057390A CN106435368B CN 106435368 B CN106435368 B CN 106435368B CN 201611057390 A CN201611057390 A CN 201611057390A CN 106435368 B CN106435368 B CN 106435368B
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temperature
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molten steel
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CN106435368A (en
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张青学
汤伟
刘丹
高擎
李玉路
杨云清
杨俊�
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Hunan Hualing Xiangtan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32Ferrous alloys, e.g. steel alloys containing chromium with boron

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

A kind of production method of anti-delayed fracture ultrahigh-strength steel plates
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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