CN114850426A - 一种提高连铸轴承钢心部致密性的方法 - Google Patents
一种提高连铸轴承钢心部致密性的方法 Download PDFInfo
- Publication number
- CN114850426A CN114850426A CN202210605017.4A CN202210605017A CN114850426A CN 114850426 A CN114850426 A CN 114850426A CN 202210605017 A CN202210605017 A CN 202210605017A CN 114850426 A CN114850426 A CN 114850426A
- Authority
- CN
- China
- Prior art keywords
- equal
- temperature
- less
- percent
- rolling
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- 238000005096 rolling process Methods 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000498 cooling water Substances 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052785 arsenic Inorganic materials 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 3
- 229910052729 chemical element Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052745 lead Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 238000002386 leaching Methods 0.000 abstract description 2
- 238000005204 segregation Methods 0.000 description 9
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
-
- 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
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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)
- Metal Rolling (AREA)
Abstract
本发明涉及轴承钢技术领域,尤其涉及一种提高连铸轴承钢心部致密性的方法。具体包括如下步骤:1)中间包温度1465~1480℃,拉速保持恒定,二冷水比水量0.20±0.02L/kg,结晶器电磁搅拌电流530±50A,末端电磁搅拌电流580±50A,频率6±0.5Hz;保温时间≥30h;2)预热段温度<600℃,加二段温度880℃~920℃,加一段温度1230℃~1260℃,均热段温度1200℃~1220℃,均热段保温时间≥2h,总加热时间≥9h;3)初轧温度1100℃~1200℃,在第4架连轧机前进行“等温操作”,等温时间2~3min;待表面温度降至950℃~970℃,入连轧机进行轧制,终轧温度≤950℃。工艺简单易行,对设备要求不高,使轴承钢心部在酸浸低倍检验下无缩孔,超声波探伤结果在B级以上。
Description
技术领域
本发明涉及轴承钢技术领域,尤其涉及一种提高连铸轴承钢心部致密性的方法。
背景技术
进入21世纪以来,随着我国交通运输、石油化工、重型机械、海洋工程、核电军工等行业的技术进步和迅猛发展,对钢铁产品的质量、性能、规格、尺寸等提出了更高的技术要求,从而大力推动了宽(特)板、大断面方(圆)坯等宽大断面连铸坯生产工艺与装备控制技术的发展。目前,国内外先进连铸机的断面均趋于宽大化,如日本住友和歌山、兴澄特钢、大连特钢、济源钢铁等分别建成投产了370mm×600mm、390mm×510mm、380mm×490mm、400mm×500mm大方坯连铸机。然而,由于大断面连铸坯多采用低拉速浇铸,不仅铸坯凝固速率大大降低,而且随着断面的增宽加厚,其内部冷却条件明显恶化,凝固组织中柱状晶发达,枝晶间富含溶质偏析元素的残余钢液流动趋于平衡,导致铸坯偏析、疏松和缩孔缺陷愈加严重。这些缺陷在后继加热、轧制过程中又难以有效消除,从而影响了最终产品质量。
目前,国内外研究者提出了通过连铸坯凝固末端压下,以挤压排出溶质偏析钢液,同时焊合中心缩孔的凝固末端压下技术。特别是重压下技术也已经成为全面提升连铸坯致密度与均质度,实现低轧制压缩比生产厚板的重要保障手段。然而,研究者们在研究过程中发现,由于铸坯加厚引起的变形抗力与变形量增大,铸坯增宽引起的溶质非均匀扩散与分布趋势加剧,以及重压下变形引起的内裂纹风险倍增等诸多条件的改变,宽大断面连铸坯凝固末端重压下量(率)实施过程中的两相区坯壳变形、凝固传热、溶质微观偏析、溶质宏观扩散等行为更加复杂多变,各行为之间的相互影响作用愈加突显且已无法忽略。实践证明,现有研究方法与常规压下工艺理论已难以指导连铸机压下参数设计,只能依靠反复的工业试验进行不断的优化和调试,严重制约着压下工艺的实施效果和稳定性。
发明内容
为了克服现有技术的不足,提供一种提高连铸轴承钢心部致密性的方法,工艺简单易行,对设备要求不高,使轴承钢心部在酸浸低倍检验下无缩孔,超声波探伤结果在B级以上。
为了达到上述目的,本发明采用以下技术方案实现:
一种提高连铸轴承钢心部致密性的方法,所述轴承钢由如下重量百分含量的化学元素组成:
C:0.95%~1.05%、Si:0.15%~0.35%、Mn:0.25%~0.45%、Cr:1.40%~1.65%、Mo≤0.10%、Ni≤0.25%、Cu≤0.25%、P≤0.025%、S≤0.020%、O≤0.0012%、Ti≤0.0050%、Alt≤0.050%、As≤0.04%、As+Sn+Sb≤0.075%、Pb≤0.002%,余量为铁和不可避免的杂质。
具体包括如下步骤:
1)连铸矩形坯
中间包温度1465~1480℃,拉速保持恒定,二冷水比水量0.20±0.02L/kg,结晶器电磁搅拌电流530±50A,末端电磁搅拌电流580±50A,频率6±0.5Hz;
全过程保护浇铸,结晶器保护渣使用高碳钢保护渣;
铸坯切割采用自动加人工相结合的方式,铸坯保温采用红钢垫底方式,保温时间≥30h。
2)铸坯在加热炉加热
采用步进梁式加热炉加热,采用冷装工艺,预热段温度<600℃,加二段温度880℃~920℃,加一段温度1230℃~1260℃,均热段温度1200℃~1220℃,均热段保温时间≥2h,总加热时间≥9h。
3)轧机控制轧制
轧制采用的是φ1150mm初轧机及连轧机组,初轧温度1100℃~1200℃,在第4架连轧机前进行“等温操作”,等温时间2~3min;待表面温度降至950℃~970℃,入连轧机进行轧制,终轧温度≤950℃。
与现有技术相比,本发明的有益效果是:
(1)本发明中间包温度控制在合理的范围内,以保证在较低的过热度下浇铸,连铸时拉速保持恒定,控制二冷水比水量、结晶器电磁搅拌及末端电磁搅拌参数,使其达到最佳配合,以改善铸坯的中心疏松及缩孔。采用步进梁式热炉加热,经初轧机开坯后,在第4架连轧机前进行“等温操作”,利用中间坯表面和心部冷速的差异,在“等温操作”后使中间坯表面温度低于心部温度,在随后的轧制过程中可使轧制力传导到心部,有利于提高心部的致密性。
(2)现有技术提高轴承钢心部致密性的方法是采用连铸重压下技术,需要在连铸机上新增额外的设备以实现此工艺,需要一定的资金投入,而且设备的调试和压下工艺的制定需要具备较高的技术水平才可实现。本发明连铸采用的是常规工艺,无需增加额外的设备,工艺及操作简单易行。本发明轧制工艺紧需在连轧机组前进行“等温操作”,只需计时和测温即可,操作直观简便,其它过程均与现行工艺相同,因此本发明工艺就简单易行,也无需额外的资金投入。
(3)本发明所述轴承钢,规格范围φ85mm~φ130mm,一般疏松≤0.5级,中心疏松≤0.5级,锭型偏析0级,残余缩孔为0级,碳化物液析0级,即无锭型偏析、残余缩孔和碳化物液析,碳化物带状≤2.0级,超声波探伤达到AA级及以上。满足了制备高等级轴承的心部致密性要求。
附图说明
图1是本发明实施例3低倍图;
图2是本发明实施例3金相图。
具体实施方式
本发明公开了一种提高连铸轴承钢心部致密性的方法。本领域技术人员可以借鉴本文内容,适当改进工艺参数实现。特别需要指出的是,所有类似的替换和改动对本领域技术人员来说是显而易见的,它们都被视为包括在本发明。本发明的方法及应用已经通过较佳实施例进行了描述,相关人员明显能在不脱离本发明内容、精神和范围内对本文所述的方法和应用进行改动或适当变更与组合,来实现和应用本发明技术。
一种提高连铸轴承钢心部致密性的方法,所述轴承钢由如下重量百分含量的化学元素组成:
C:0.95%~1.05%、Si:0.15%~0.35%、Mn:0.25%~0.45%、Cr:1.40%~1.65%、Mo≤0.10%、Ni≤0.25%、Cu≤0.25%、P≤0.025%、S≤0.020%、O≤0.0012%、Ti≤0.0050%、Alt≤0.050%、As≤0.04%、As+Sn+Sb≤0.075%、Pb≤0.002%,余量为铁和不可避免的杂质;
本发明所述轴承钢,规格范围φ85mm~φ130mm,一般疏松≤0.5级,中心疏松≤0.5级,锭型偏析0级,残余缩孔为0级,碳化物液析0级,即无锭型偏析、残余缩孔和碳化物液析,碳化物带状≤2.0级,超声波探伤达到AA级及以上。
一种提高连铸轴承钢心部致密性的方法生产过程如下:
1)连铸过程中间包温度控制在1465~1480℃,以保证在较低的过热度下浇铸,有利于心部质量的改善,连铸机采用4流浇钢,拉速保持在0.42m/min恒定,连铸坯横截面为350mm×470mm,二冷水比水量为0.20±0.02L/kg,结晶器电磁搅拌电流530±50A,末端电磁搅拌电流580±50A,频率6±0.5Hz,以改善铸坯的中心疏松及缩孔。
为防止钢液凝固时产生氧化,连铸全过程采用长水口、浸入式水口、中包吹扫措施,全程保护浇铸,结晶器保护渣使用高碳钢保护渣。
铸坯切割采用自动加人工相结合的方式,轴承钢冷却过程中易产生应力裂纹,因此需对铸坯进行保温,铸坯保温采用红钢垫底方式,保温时间≥30h。
2)铸坯加热采用步进梁式加热炉进行加热,铸坯加热采用冷装工艺,预热段温度<600℃,加二段温度880℃~920℃,加一段温度1230℃~1260℃,均热段温度1200℃~1220℃,均热段保温时间≥2h,总加热时间≥9h。保证高温扩散时间可以保证轴承钢碳化物液析、碳化物带状满足标准要求,均热段采用微还原性气氛,防止铸坯产生脱碳。
3)轧机控制轧制
轧制采用的是φ1150mm初轧机及连轧机组,初轧温度控制在1100℃~1200℃,在第4架连轧机前进行“等温操作”,等温时间2min~3min,待表面温度降至950℃~970℃后,入连轧机进行轧制,终轧温度控制在≤950℃,随后入保温坑保温。经初轧机开坯后,在连轧机前进行“等温操作”,利用中间坯表面和心部冷速的差异,在“等温操作”后使中间坯表面温度低于心部温度,在随后的轧制过程中可使轧制力传导到心部,提高了钢材的心部致密性。
实施例:
本发明实施例的化学成分见表1;相应实施例的连铸工艺见表2;相应实施例的加热工艺见表3;相应实施例的轧制工艺见表4;相应实施例的低倍、金相及超声波检验结果见表5。实施例3的低倍、金相如图1和图2所示。
表1本发明实施例的化学成分wt%
表2本发明实施例的连铸工艺
表3本发明实施例的加热工艺
表4本发明实施例的轧制工艺
实施例 | 初轧温度/℃ | 等温时间/min | 等温后表面温度/℃ | 终轧温度/℃ |
1 | 1153 | 2.6 | 964 | 945 |
2 | 1150 | 2.6 | 963 | 945 |
3 | 1148 | 2.5 | 955 | 940 |
4 | 1153 | 2.5 | 958 | 941 |
5 | 1146 | 2.5 | 953 | 941 |
6 | 1155 | 2.6 | 962 | 946 |
表5本发明实施例的低倍、金相及超声波检验结果
注:本发明低倍检验采用的腐蚀方法为,采用工业浓盐酸与水按体积比1:1进行混合,加热腐蚀,加热温度75℃,腐蚀时间为20分钟。
本发明金相组织检验采用钢材纵向截面试样,试样经过840℃保温30min淬火,然后在150℃保温1.5h回火处理,经过金相制样后用4%的硝酸酒精溶液腐蚀30s,然后用金相显微镜观察。
一般疏松、中心疏松、锭型偏析、残余缩孔、碳化物液析、碳化物带状的检验结果级别越低质量越好,0级说明没有此缺陷。
超声波探伤质量等级最高为AAA级,依次按AA级、A级、B级、C级递减。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (5)
1.一种提高连铸轴承钢心部致密性的方法,所述轴承钢由如下重量百分含量的化学元素组成:
C:0.95%~1.05%、Si:0.15%~0.35%、Mn:0.25%~0.45%、Cr:1.40%~1.65%、Mo≤0.10%、Ni≤0.25%、Cu≤0.25%、P≤0.025%、S≤0.020%、O≤0.0012%、Ti≤0.0050%、Alt≤0.050%、As≤0.04%、As+Sn+Sb≤0.075%、Pb≤0.002%,余量为铁和不可避免的杂质;
其特征在于,具体包括如下步骤:
1)连铸矩形坯
中间包温度1465~1480℃,拉速保持恒定,二冷水比水量0.20±0.02L/kg,结晶器电磁搅拌电流530±50A,末端电磁搅拌电流580±50A,频率6±0.5Hz;
全过程保护浇铸,结晶器保护渣使用高碳钢保护渣;
铸坯切割采用自动加人工相结合的方式,铸坯保温采用红钢垫底方式,保温时间≥30h;
2)铸坯在加热炉加热
采用步进梁式加热炉加热,采用冷装工艺,预热段温度<600℃,加二段温度880℃~920℃,加一段温度1230℃~1260℃,均热段温度1200℃~1220℃,均热段保温时间≥2h,总加热时间≥9h;
3)轧机控制轧制
初轧温度1100℃~1200℃,在第4架连轧机前进行“等温操作”,等温时间2~3min;待表面温度降至950℃~970℃,入连轧机进行轧制。
2.根据权利要求1所述的一种提高连铸轴承钢心部致密性的方法,其特征在于,步骤1)连铸矩形坯的尺寸为350mm×470mm。
3.根据权利要求1所述的一种提高连铸轴承钢心部致密性的方法,其特征在于,步骤1)拉速保持0.42m/min恒定,二冷水比水量0.20L/kg,结晶器电磁搅拌电流530A,末端电磁搅拌电流580A,频率6Hz。
4.根据权利要求1所述的一种提高连铸轴承钢心部致密性的方法,其特征在于,步骤3)轧制采用的是φ1150mm初轧机及连轧机组。
5.根据权利要求1所述的一种提高连铸轴承钢心部致密性的方法,其特征在于,步骤3)终轧温度≤950℃。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210605017.4A CN114850426B (zh) | 2022-05-31 | 2022-05-31 | 一种提高连铸轴承钢心部致密性的方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210605017.4A CN114850426B (zh) | 2022-05-31 | 2022-05-31 | 一种提高连铸轴承钢心部致密性的方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN114850426A true CN114850426A (zh) | 2022-08-05 |
CN114850426B CN114850426B (zh) | 2023-11-17 |
Family
ID=82640615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202210605017.4A Active CN114850426B (zh) | 2022-05-31 | 2022-05-31 | 一种提高连铸轴承钢心部致密性的方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN114850426B (zh) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101642774A (zh) * | 2009-09-15 | 2010-02-10 | 邢台钢铁有限责任公司 | GCr15轴承钢大方坯连铸动态轻压下工艺 |
CN104057051A (zh) * | 2013-09-13 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种小方坯连铸轴承钢的生产方法 |
CN105363799A (zh) * | 2015-10-21 | 2016-03-02 | 钢铁研究总院 | 一种组织与性能均匀化钢材的非均温控轧控冷工艺 |
CN107350445A (zh) * | 2017-06-16 | 2017-11-17 | 中原特钢股份有限公司 | 渗碳轴承钢G20Cr2Ni4连铸圆坯的生产方法 |
WO2020253335A1 (zh) * | 2019-06-20 | 2020-12-24 | 江阴兴澄特种钢铁有限公司 | 一种大厚度抗层状撕裂屈服强度960MPa级高强钢板及其生产方法 |
CN113714280A (zh) * | 2021-08-23 | 2021-11-30 | 南京钢铁股份有限公司 | 一种改善高碳铬轴承钢100Cr6棒材显微孔隙的生产工艺 |
CN114012055A (zh) * | 2021-11-11 | 2022-02-08 | 建龙北满特殊钢有限责任公司 | 一种高均质高碳铬轴承钢矩形大方坯的连铸工艺 |
-
2022
- 2022-05-31 CN CN202210605017.4A patent/CN114850426B/zh active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101642774A (zh) * | 2009-09-15 | 2010-02-10 | 邢台钢铁有限责任公司 | GCr15轴承钢大方坯连铸动态轻压下工艺 |
CN104057051A (zh) * | 2013-09-13 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种小方坯连铸轴承钢的生产方法 |
CN105363799A (zh) * | 2015-10-21 | 2016-03-02 | 钢铁研究总院 | 一种组织与性能均匀化钢材的非均温控轧控冷工艺 |
CN107350445A (zh) * | 2017-06-16 | 2017-11-17 | 中原特钢股份有限公司 | 渗碳轴承钢G20Cr2Ni4连铸圆坯的生产方法 |
WO2020253335A1 (zh) * | 2019-06-20 | 2020-12-24 | 江阴兴澄特种钢铁有限公司 | 一种大厚度抗层状撕裂屈服强度960MPa级高强钢板及其生产方法 |
CN113714280A (zh) * | 2021-08-23 | 2021-11-30 | 南京钢铁股份有限公司 | 一种改善高碳铬轴承钢100Cr6棒材显微孔隙的生产工艺 |
CN114012055A (zh) * | 2021-11-11 | 2022-02-08 | 建龙北满特殊钢有限责任公司 | 一种高均质高碳铬轴承钢矩形大方坯的连铸工艺 |
Also Published As
Publication number | Publication date |
---|---|
CN114850426B (zh) | 2023-11-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6883096B2 (ja) | 連続鋳造鋼片により製造された厚さが最大で177.8mmであるギアラック鋼板及びその製造方法 | |
CN105755375B (zh) | 一种连铸坯生产低压缩比高性能特厚钢板及其制造方法 | |
CN101481778B (zh) | 一种奥氏体不锈钢带及其制造方法 | |
CN109112423B (zh) | 一种优良低温韧性特厚合金钢板及其制备方法 | |
CN110935827B (zh) | 一种较大规格细晶奥氏体不锈钢SNCrW棒材的锻造方法 | |
CN113481427B (zh) | 一种连铸坯生产冷镦模块用中碳低合金CrMnSiB系钢锻、轧制棒材及其制造方法 | |
WO2022227891A1 (zh) | 一种大规格直接切削用非调质钢的制备方法 | |
CN110616360A (zh) | 一种辊套用32Cr3Mo1V连铸大圆坯生产方法 | |
CN114250402A (zh) | 一种低碳含氮奥氏体不锈钢棒的制造方法 | |
CN114635058A (zh) | 一种镍基高温合金电渣锭及其制造方法 | |
CN114015847A (zh) | 采用控轧控冷工艺生产一种直接切削用45钢的方法 | |
CN113621897A (zh) | 一种含稀土耐热合金钢及其板坯连铸工艺 | |
CN109825769B (zh) | 一种含钼不锈钢焊条钢及其制备方法 | |
CN1285749C (zh) | 铝铸轧机用辊套钢和热处理方法 | |
WO2024051758A1 (zh) | 一种发动机传动链用钢50CrVA的制备方法 | |
CN108950134B (zh) | 冷轧辊用电渣锭的重熔方法 | |
CN114850426A (zh) | 一种提高连铸轴承钢心部致密性的方法 | |
CN108015255B (zh) | 一种高速工具钢的制备方法 | |
CN116065010A (zh) | 一种超高强度马氏体时效钢的均匀化处理方法 | |
WO2023137842A1 (zh) | 一种具有高热扩散系数模具钢及其制备方法 | |
CN115740378A (zh) | 承压件用奥氏体不锈钢0Cr19Ni10连铸大圆坯的制备方法 | |
CN114905010A (zh) | 镍基合金线材及其制备方法 | |
CN114657441A (zh) | 一种低密度高强高韧热轧钢板的制造方法 | |
CN112921154A (zh) | 一种制作高合金马氏体气阀钢的方法 | |
CN115627408B (zh) | 基于薄带铸轧的高磁感无取向硅钢的生产方法 |
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 |