CN116287969B - 一种低裂纹率低合金高强度钢异型坯的生产方法 - Google Patents
一种低裂纹率低合金高强度钢异型坯的生产方法 Download PDFInfo
- Publication number
- CN116287969B CN116287969B CN202211100378.XA CN202211100378A CN116287969B CN 116287969 B CN116287969 B CN 116287969B CN 202211100378 A CN202211100378 A CN 202211100378A CN 116287969 B CN116287969 B CN 116287969B
- Authority
- CN
- China
- Prior art keywords
- equal
- less
- temperature
- section
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 14
- 239000000956 alloy Substances 0.000 title claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002893 slag Substances 0.000 claims description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 12
- 238000010079 rubber tapping Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 208000029154 Narrow face Diseases 0.000 claims description 3
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 230000003031 feeding effect Effects 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000010287 polarization Effects 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
本发明公开了一种低裂纹率低合金高强度钢异型坯的生产方法,其化学成分的质量百分含量包括C0.18‑0.21%、Si0.35‑0.45%、Mn1.30‑1.40%、P≤0.030%、S≤0.008%、V0.010‑0.020%、Cr≤0.01%、Ni≤0.01%、Mo≤0.01%、Cu≤0.01%、N≤0.012,其余为Fe和杂质,质量分数共计100%;所述其冶炼工艺为:转炉冶炼、LF精炼、异型坯连铸,通过炼钢各工艺优化控制,轧后铸坯裂纹产生率低于0.3%。
Description
技术领域
本发明涉及冶炼技术领域,尤其涉及一种低裂纹率低合金高强度钢异型坯的生产方法及其生产方法。
背景技术
异型坯横截面形状复杂,不同部位热量散失的速度差异大,温度分布的均匀性较常规铸坯差,导致其裂纹敏感性增强,铸坯缺陷比例增大。包钢异型坯铸机自投产以来,主要以生产普碳钢和低合金钢为主,其中产量最大的钢种为Q235B和Q355B。异形坯质量缺陷产生率远大于常规铸机,主要缺陷为铸坯纵向裂纹。据不完全统计,国内异型坯轧后裂纹比率为2%-4%。
发明内容
为了解决上述技术问题,本发明的目的是提供一种低裂纹率低合金高强度钢异型坯的生产方法,解决的问题。
为解决上述技术问题,本发明采用如下技术方案:
本发明一种低裂纹率低合金高强度钢异型坯的生产方法,其化学成分的质量百分含量包括C 0.18-0.21%、Si 0.35-0.45%、Mn 1.30-1.40%、P≤0.030%、S≤0.008%、V0.010-0.020%、Cr≤0.01%、Ni≤0.01%、Mo≤0.01%、Cu≤0.01%、N≤0.012,其余为Fe和杂质,质量分数共计100%;其生产工艺具体包括:
复吹转炉冶炼:铁皮球必须前期5min以内加入;入炉铁水硫不大于0.050%;出钢碳目标:C>0.08%;转炉供精炼目标就位铝0.005%-0.015%,具体脱氧剂加入量根据转炉碳及硫含量进行适当调整;终点控制:T≥1600℃;出钢时间>4min;全程挡渣,P差≤0.004%;
LF精炼:精炼喂线量要求在70-100m,严格控制喂线速度;喂线前必须调节氩气,保证吹开渣液面在25-30cm,喂线前必须调整好炉渣粘度,保证喂线效果,确保线打到钢水里,软吹时间大于15min,脱氧剂用铝铁、铝粒和硅钙钡脱氧;硅钙钡每炉的使用量不得超过50kg,关注转炉出钢S情况,保证及时成渣;过热度控制:BB1、BB2、BB3、BB4断面过热度≤35℃;控制成品S≤0.008%以下,同时满足Mn/S值大于60;精炼处理时间≥40min,上钢温度1570℃-1585℃;
连铸:结晶器与Ⅰ段对弧精度控制在0.2mm以内;铸机保证水口对中,杜绝偏流;严格执行长水口吹氩;中包液位必须满包操作;中包渣厚不得超过100mm;保护渣使用前需进行烘烤,保护渣厚度控制在40-50mm;保证使用保护渣水分≤0.5%;结晶器与扇形I段对弧≤0.3mm;保证吹水器吹水效果;结晶器水量:压力≥0.8Mpa,BB1:宽面1300L/min、窄面850L/min;
BB2:宽面2200L/min、窄面1200L/min;BB3:宽面2400L/min、窄面900L/min;
BB4:宽面2500L/min、窄面1000L/min;大包长水口采用加石棉碗及氩封保护浇注;结晶器内液位自动控制,液位波动控制在±3mm;过热度控制在20-35℃;长水口***深度:150-200mm,浸入式水口***深度50-70mm;拉速控制BB1断面:1.0-1.1m/min,BB2断面:0.75-0.85m/min,BB3断面:0.75-0.90m/min,BB4断面:0.7-0.80m/min;
加热工艺:预热段温度≤900℃,加热Ⅰ段温度≤1200℃,加热Ⅱ段温度为1100℃-1330℃,均热段温度为1200℃-1300℃,出炉温度≥1150℃;在炉时间≥2小时20分;
轧制工艺:BD1开坯,开轧温度≥1150℃;CCS万能轧制,终轧最后一道次温度控制在940℃以下;冷床自然冷却,成品温度低于100℃以后进行矫直、锯切。
进一步的,其特征在于:保护浇筑时氩封压力:1.1Mpa,流量:20-30L/s。
进一步的,适用于异型坯断面350×290×100mm(BB1)、555×440×105mm(BB2)、730×370×90mm(BB3)、1024×390×120mm(BB4)。
进一步的,其特征在于:二冷采用弱冷水表,保护渣为斯多伯格73A,保护渣厚度控到40-50mm。
进一步的,其特征在于:结晶器及喷淋水水质必须符合标准要求,浊度(NTU)<10、钙硬度(mg/l)<20、总铁(mg/l)<0.5;喷淋水压力不得低于0.80Mpa,结晶器进水温度要求20-35℃,进出水温差4-6℃;扇形I、II段对弧不得大于0.5mm,振动偏振测试要求≤0.20mm。
与现有技术相比,本发明的有益技术效果:
通过本方法的生产方法,异型坯轧后裂纹比率低于0.3%。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为原生产工艺下热酸铸坯裂纹裂貌。
图2为现生产工艺下热酸铸坯形貌。
具体实施方式
下面结合实施例对本发明做进一步详细说明
本发明一种低裂纹率低合金高强度钢异型坯及其生产方法,其化学成分的质量百分含量包括:C 0.18-0.21%、Si 0.35-0.45%、Mn 1.30-1.40%、P≤0.030%、S≤0.008%、V 0.010-0.020%、Cr≤0.01%、Ni≤0.01%、Mo≤0.01%、Cu≤0.01%、N≤0.012,其余为Fe和杂质,质量分数共计100%。
本发明一种低裂纹率低合金高强度钢异型坯及其生产方法的冶炼工艺为:转炉冶炼、LF精炼、异型坯连铸。
复吹转炉冶炼,铁皮球必须前期5min以内加入;入炉铁水硫不大于0.050%;出钢碳目标:C>0.08%;转炉供精炼目标就位铝0.005%-0.015%,具体脱氧剂加入量根据转炉碳及硫含量进行适当调整;终点控制:T≥1600℃;供精炼目标成分0.13%≤C≤0.18%,0.30%≤Si≤0.45%,1.25%≤Mn≤1.40%,P<0.025%。出钢时间>4min;全程挡渣,P差≤0.004%。
LF精炼:精炼喂线量要求在70-100m,严格控制喂线速度。喂线前必须调节氩气,保证吹开渣液面在25-30cm左右,喂线前必须调整好炉渣粘度,保证喂线效果,确保线打到钢水里,必须保证软吹效果(300mm左右),且软吹时间大于15min,脱氧剂用铝铁、铝粒和硅钙钡脱氧。硅钙钡每炉的使用量不得超过50kg,关注转炉出钢S情况,保证及时成渣;过热度控制:BB1、BB2、BB3、BB4断面过热度≤35℃。控制成品S≤0.008%以下,同时满足Mn/S值大于60。精炼处理时间≥40min,上钢温度1570℃-1585℃。
连铸:结晶器与Ⅰ段对弧精度控制在0.2mm以内。铸机保证水口对中,杜绝偏流。严格执行长水口吹氩;中包液位必须满包操作。中包渣厚不得超过100mm。保护渣使用前需进行烘烤,保护渣厚度控制在40-50mm;保证使用保护渣水分≤0.5%。结晶器与扇形I段对弧≤0.3mm。保证吹水器吹水效果。结晶器水量:压力≥0.8Mpa,BB1:宽面1300L/min、窄面850L/min;
BB2:宽面2200L/min、窄面1200L/min;BB3:宽面2400L/min、窄面900L/min;
BB4:宽面2500L/min、窄面1000L/min;大包长水口采用加石棉碗及氩封(压力:1.1Mpa,流量:20-30L/s)保护浇注;结晶器内液位自动控制,液位波动控制在±3mm。过热度控制在20-35℃。长水口***深度:150-200mm,浸入式水口***深度50-70mm。拉速控制BB1断面:1.0-1.1m/min,BB2断面:0.75-0.85m/min,BB3断面:0.75-0.90m/min,BB4断面:0.7-0.80m/min。
二冷采用弱冷水表,保护渣为斯多伯格73A(密度:0.81g/ml;熔点:1139℃;粘度:3.36Poise),保护渣厚度控到40-50mm。
结晶器及喷淋水水质必须符合标准要求,浊度(NTU)<10、钙硬度(mg/l)<20、总铁(mg/l)<0.5。喷淋水压力不得低于0.80Mpa,结晶器进水温度要求20-35℃,进出水温差4-6℃。扇形I、II段对弧不得大于0.5mm,振动偏振测试要求≤0.20mm。
适用于异型坯断面350×290×100mm(BB1)、555×440×105mm(BB2)、730×370×90mm(BB3)、1024×390×120mm(BB4)。
轧制工艺为:步进加热炉、BD开坯、CCS万能轧制、步进冷床冷却。
加热工艺:预热段温度≤900℃,加热Ⅰ段温度≤1200℃,加热Ⅱ段温度为1100℃-1330℃,均热段温度为1200℃-1300℃,出炉温度≥1150℃。在炉时间≥2小时20分。
轧制工艺:BD1开坯,开轧温度≥1150℃。CCS万能轧制,终轧最后一道次温度控制在940℃以下。冷床自然冷却,成品温度低于100℃以后进行矫直、锯切。
表1各实施例化学成分
表2各实施例铸坯断面、过热度及拉速
表3各实施例在炉时间、开轧温度、终轧温度
表4各实施例轧后裂纹比例
如图1所示,为原生产工艺下铸坯裂纹裂纹形貌;如图2所示,本发明的工艺下铸坯热酸未发现裂纹。
以上所述的实施例仅是对本发明的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (5)
1.一种低裂纹率低合金高强度钢异型坯的生产方法,其特征在于:其化学成分的质量百分含量包括C 0.18-0.21%、Si 0.35-0.45%、Mn 1.30-1.40%、P≤0.030%、S≤0.008%、V0.010-0.020%、Cr ≤0.01%、Ni ≤0.01%、Mo ≤0.01%、Cu ≤0.01%、N ≤0.012,其余为Fe和杂质,质量分数共计100%;其生产工艺具体包括:
复吹转炉冶炼:铁皮球必须前期5min以内加入;入炉铁水硫不大于0.050%;出钢碳目标:C>0.08%;转炉供精炼目标就位铝0.005%-0.015%,具体脱氧剂加入量根据转炉碳及硫含量进行适当调整;终点控制:T≥1600℃;出钢时间>4min;全程挡渣,P差≤0.004%;
LF精炼:精炼喂线量要求在70-100m,严格控制喂线速度;喂线前必须调节氩气,保证吹开渣液面在25-30cm,喂线前必须调整好炉渣粘度,保证喂线效果,确保线打到钢水里,软吹时间大于15min,脱氧剂用铝铁、铝粒和硅钙钡脱氧;硅钙钡每炉的使用量不得超过50kg,关注转炉出钢S情况,保证及时成渣;过热度控制:BB1、BB2、BB3、BB4断面过热度≤35℃;控制成品S≤0.008%,同时满足Mn/S值大于60;精炼处理时间≥40min,上钢温度1570℃-1585℃;
连铸:结晶器与Ⅰ段对弧精度控制在0.2mm以内;铸机保证水口对中,杜绝偏流;严格执行长水口吹氩;中包液位必须满包操作;中包渣厚不得超过100mm;保护渣使用前需进行烘烤,保护渣厚度控制在40-50mm;保证使用保护渣水分≤0.5%;结晶器与扇形I段对弧≤0.3mm;保证吹水器吹水效果;结晶器水量:压力≥0.8Mpa,BB1:宽面1300L/min、窄面850L/min;
BB2:宽面2200L/min、窄面1200L/min;BB3:宽面2400L/min、窄面900L/min;
BB4:宽面2500L/min、窄面1000L/min;大包长水口采用加石棉碗及氩封保护浇注;结晶器内液位自动控制,液位波动控制在±3 mm;过热度控制在20-35℃;长水口***深度:150-200mm,浸入式水口***深度50-70mm;拉速控制BB1断面:1.0-1.1m/min,BB2断面:0.75-0.85m/min,BB3断面:0.75-0.90m/min,BB4断面:0.7-0.80m/min;
加热工艺:预热段温度≤900℃,加热Ⅰ段温度≤1200℃,加热Ⅱ段温度为1100℃-1330℃,均热段温度为1200℃-1300℃,出炉温度≥1150℃;在炉时间≥2小时20分;
轧制工艺:BD1开坯,开轧温度≥1150℃;CCS万能轧制,终轧最后一道次温度控制在940℃以下;冷床自然冷却,成品温度低于100℃以后进行矫直、锯切。
2.根据权利要求1所述的低裂纹率低合金高强度钢异型坯的生产方法,其特征在于:保护浇筑时氩封压力:1.1Mpa,流量:20-30L/s。
3.根据权利要求1所述的低裂纹率低合金高强度钢异型坯的生产方法,其特征在于:适用于异型坯断面350×290×100mm BB1、555×440×105mm BB2、730×370×90mm BB3、1024×390×120mm BB4。
4.根据权利要求1所述的低裂纹率低合金高强度钢异型坯的生产方法,其特征在于:二冷采用弱冷水表,保护渣为斯多伯格73A,保护渣厚度控到40-50mm。
5.根据权利要求1所述的低裂纹率低合金高强度钢异型坯的生产方法,其特征在于:结晶器及喷淋水水质必须符合标准要求,浊度NTU<10、钙硬度<20mg/l、总铁<0.5mg/l;喷淋水压力不得低于0.80Mpa,结晶器进水温度要求20-35℃,进出水温差4-6℃;扇形I、II段对弧不得大于0.5mm,振动偏振测试要求≤0.20mm。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211100378.XA CN116287969B (zh) | 2022-09-08 | 2022-09-08 | 一种低裂纹率低合金高强度钢异型坯的生产方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211100378.XA CN116287969B (zh) | 2022-09-08 | 2022-09-08 | 一种低裂纹率低合金高强度钢异型坯的生产方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN116287969A CN116287969A (zh) | 2023-06-23 |
CN116287969B true CN116287969B (zh) | 2024-03-08 |
Family
ID=86800102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202211100378.XA Active CN116287969B (zh) | 2022-09-08 | 2022-09-08 | 一种低裂纹率低合金高强度钢异型坯的生产方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN116287969B (zh) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007169688A (ja) * | 2005-12-20 | 2007-07-05 | Kobe Steel Ltd | 冷間切断性と疲労特性に優れた冷間成形ばね用鋼線とその製造方法 |
JP2007197777A (ja) * | 2006-01-27 | 2007-08-09 | Jfe Steel Kk | 耐延性亀裂発生特性と耐疲労亀裂伝播特性に優れた高強度鋼材およびその製造方法 |
CN108048625A (zh) * | 2017-12-14 | 2018-05-18 | 南阳汉冶特钢有限公司 | 一种减少热装热送钢坯轧制钢板裂纹的生产工艺 |
CN111676414A (zh) * | 2020-05-13 | 2020-09-18 | 包头钢铁(集团)有限责任公司 | 一种具有低表面裂纹率的高强含磷耐候异型铸坯的制备方法 |
CN112517634A (zh) * | 2020-10-20 | 2021-03-19 | 包头钢铁(集团)有限责任公司 | 一种生产低成本355MPa热轧H型钢的工艺 |
WO2022017545A1 (zh) * | 2020-09-18 | 2022-01-27 | 莱芜钢铁集团银山型钢有限公司 | V-n微合金钢及v-n微合金化的无表面裂纹连铸坯的生产方法 |
WO2022099680A1 (zh) * | 2020-11-16 | 2022-05-19 | 何满潮 | Npr锚杆或锚索新材料转炉及连铸小方坯的生产方法 |
-
2022
- 2022-09-08 CN CN202211100378.XA patent/CN116287969B/zh active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007169688A (ja) * | 2005-12-20 | 2007-07-05 | Kobe Steel Ltd | 冷間切断性と疲労特性に優れた冷間成形ばね用鋼線とその製造方法 |
JP2007197777A (ja) * | 2006-01-27 | 2007-08-09 | Jfe Steel Kk | 耐延性亀裂発生特性と耐疲労亀裂伝播特性に優れた高強度鋼材およびその製造方法 |
CN108048625A (zh) * | 2017-12-14 | 2018-05-18 | 南阳汉冶特钢有限公司 | 一种减少热装热送钢坯轧制钢板裂纹的生产工艺 |
CN111676414A (zh) * | 2020-05-13 | 2020-09-18 | 包头钢铁(集团)有限责任公司 | 一种具有低表面裂纹率的高强含磷耐候异型铸坯的制备方法 |
WO2022017545A1 (zh) * | 2020-09-18 | 2022-01-27 | 莱芜钢铁集团银山型钢有限公司 | V-n微合金钢及v-n微合金化的无表面裂纹连铸坯的生产方法 |
CN112517634A (zh) * | 2020-10-20 | 2021-03-19 | 包头钢铁(集团)有限责任公司 | 一种生产低成本355MPa热轧H型钢的工艺 |
WO2022099680A1 (zh) * | 2020-11-16 | 2022-05-19 | 何满潮 | Npr锚杆或锚索新材料转炉及连铸小方坯的生产方法 |
Non-Patent Citations (2)
Title |
---|
H型钢表面裂纹成因分析;***;包燕平;孙维;黄社青;周杰;;钢铁(第08期);全文 * |
包钢Q690D钢板斜Y坡口焊接裂纹试验研究;黄利;董瑞峰;吴鹏飞;;包钢科技(第05期);全文 * |
Also Published As
Publication number | Publication date |
---|---|
CN116287969A (zh) | 2023-06-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101225453A (zh) | 低碳低硅钢的电炉冶炼方法 | |
CN110592480B (zh) | 心部低温冲击韧性优异的厚规格q345r钢板及制造方法 | |
CN110117747A (zh) | 一种高Al渗氮钢的生产方法 | |
CN114892094B (zh) | 一种预硬型镜面塑料模具钢及其生产方法 | |
CN111334718A (zh) | 一种欧洲标准R260Mn钢轨及其生产方法 | |
CN116287969B (zh) | 一种低裂纹率低合金高强度钢异型坯的生产方法 | |
CN116422853B (zh) | 一种模具钢及其连铸生产方法 | |
CN113699431A (zh) | 一种减少低合金钢表面裂纹的方法 | |
CN112813355B (zh) | 一种减少含钛包晶钢连铸板坯角部裂纹的方法 | |
CN113817968B (zh) | 一种中碳高铝钢的方坯连铸生产方法 | |
EP3674424B1 (en) | Smelting method for ultra-low carbon 13cr stainless steel | |
CN114875334B (zh) | 一种预硬型镜面塑料模具钢及其冶炼方法 | |
CN114645217B (zh) | 易切削钢及其制备方法 | |
CN115418442B (zh) | 一种lf炉冶炼降钛方法 | |
CN109913755B (zh) | 一种包晶钢及其制备方法 | |
CN116287978A (zh) | 一种低裂纹率碳素结构钢异型坯及其生产方法 | |
CN116732273A (zh) | 一种降低连铸坯裂纹率的连浇生产方法 | |
CN114438395A (zh) | 一种低成本预硬化塑料模具钢的冶炼连铸方法 | |
CN113718081A (zh) | 一种提高含硫齿轮钢连拉炉数的方法 | |
CN108286020B (zh) | 一种可用于制造大型结构部件的特厚高强高致密度钢板及其制造方法 | |
CN111663083A (zh) | 一种含钒热轧盘圆钢及其生产方法 | |
CN115491457B (zh) | 一种应用于螺纹钢生产的转炉造渣工艺 | |
CN115415495B (zh) | 一种csp薄板坯连铸连轧产线生产q355b加钛钢边裂缺陷的控制方法 | |
CN116213668A (zh) | 一种vn微合金钢连铸坯表面裂纹控制方法 | |
CN117926137A (zh) | 一种汽车轴承用钢及其制备方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |