CN116288072A - 一种非调质钢的生产方法 - Google Patents
一种非调质钢的生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 229910052717 sulfur Inorganic materials 0.000 claims description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 18
- 239000011575 calcium Substances 0.000 claims description 18
- 229910052791 calcium Inorganic materials 0.000 claims description 18
- 239000011593 sulfur Substances 0.000 claims description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000005266 casting Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 208000004434 Calcinosis Diseases 0.000 description 2
- 230000002308 calcification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- UMVBXBACMIOFDO-UHFFFAOYSA-N [N].[Si] Chemical compound [N].[Si] UMVBXBACMIOFDO-UHFFFAOYSA-N 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
-
- 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
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- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- 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
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- 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
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- 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
- C21C7/064—Dephosphorising; Desulfurising
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- 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
- C21C7/10—Handling in a vacuum
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- 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
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- 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
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- 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
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Abstract
一种非调质钢的生产方法,钢的化学组成重量百分比为C=0.36~0.40,Si=0.75~0.85,Mn=1.40~1.55,P≤0.015,S=0.055~0.075,Cr=0.12~0.16,Al=0.008~0.020,V=0.01~0.03,O≤0.0006,N≤0.018,余量为铁和不可避免的杂质;钢的晶粒度为9.0级以上,带状组织≤1.0级。本发明通过调控非调质钢的组成,并利用精准控制转炉下渣量,控制合金加入时机,调节LF精炼工艺,延长RH在站时间等方法实现氧化物的弥散分布,进而达到非调质钢中硫化锰均匀分布、且晶粒度为9.0级以上,带状组织为1.0级以下,非调质钢得到了更好的控制效果。
Description
技术领域
本发明属于冶金技术领域,涉及具体为一种非调质钢及其制备方法。
背景技术
非调质钢,是不经过调质处理就直接使用的钢材。为了获得和调质处理得到的钢材相似的机械性能,非调质钢通常使用微合金化和控制轧制相结合的生产方式来调整控制基体的组织形态,进一步得到符合要求的机械性能。采用微合金化非调质钢取代调质钢在汽车零部件上的应用能够省略调质热处理、矫直和去应力退火等工序,一方面能够节约热处理能源,另一方面还能提高锻件的成品率、生成率以及随后的切削加工性能。
易切削非调质钢通过添加硫元素改善其切削加工性能;但硫化锰作为易聚集塑性夹杂,容易在轧制后成为大尺寸长条状,在变形过程中与基体产生缝隙,破坏材料的横向性能,降低材料的横向断面收缩率。中硫非调质钢在生产过程中对硫化锰控制水平要求较高,硫化锰在轧材中分布均匀性情况、带状组织、晶粒度等直接影响着钢材质量。
中国专利CN202111421418.6公开了一种“发动机曲轴用非调质钢的生产方法”,针对非调质钢通常需要加入一定的V、Ni、Mo等微合金元素以起到细晶强化和析出强化的作用,但会增加非调质钢的生产成本的问题,省去了价格较为昂贵的V、Ni等微合金元素,以价格较低的Si、Mn合金元素为主,并加入少量较为经济的S、N、Al、Cr元素,生产的轧制圆钢产品的夹杂物含量低、硫化物分布均匀、晶粒细度达8级以上。但是经客户加工后,用于发动机曲轴仍然存在寿命达不到要求的情况,这主要是由于硫化锰作为易聚集塑性夹杂,容易在轧制后成为大尺寸长条状、分布不均。
发明内容
本发明的旨在提供一种非调质钢及其制备方法,所生产的非调质钢能达到非调质钢中硫化锰均匀分布且带状组织、晶粒度也得到更好控制的效果。
本发明提供了如下技术方案:
一种非调质钢的生产方法,其特征在于:钢的化学组成重量百分比为:C=0.36~0.40,Si=0.75~0.85,Mn=1.40~1.55,P≤0.015,S=0.055~0.075,Cr=0.12~0.16,Al=0.008~0.020,V=0.01~0.03,O≤0.0006,N≤0.018,余量为铁和不可避免的杂质;钢的晶粒度为9.0级以上,带状组织≤1.0级;包括如下工艺步骤:
S1.合格铁水进入转炉进行吹炼,控制元素含量终点C≥0.05%、P≤0.014%;
S2.LF工序快速造白渣、脱硫,精炼过程中采用SiC、铝丸进行扩散脱氧,并根据目标成分进行成分微调;钢水温度上升至≥1580℃后喂入氮线进行增氮;出站前喂入钙线进行钙处理,钙处理后再喂入硫线;
S3.RH在站时间≥45min,真空环流氮气,保持时间≥8min、软吹氩时间≥15min;
S4.连铸拉速0.80~0.90m/min,过热度15~35℃;结晶器电磁搅拌参数:电流强度300~400A、频率2.5HZ,末端电磁搅拌参数:电流强度300~400A、频率8HZ;铸坯凝固末端多点轻压下8~12mm;铸坯尺寸280mm×280mm×6m铸坯尺寸。
优选的,钢的化学组成重量百分比为C=0.38~0.40,Si=0.78~0.85,Mn=1.40~1.50,P≤0.012,S 0.060~0.070,Cr=0.12~0.15,Al=0.008~0.011,V=0.01~0.017,O≤0.0005,N≤0.015,余量为铁和不可避免的杂质。
进一步的,所述步骤S1中,控制元素含量终点C≥0.05%、P≤0.014%。
进一步地,所述步骤S2中,白渣碱度为3.0~5.0,白渣量为12~20kg/t,白渣保持时间≥30min。
进一步地,所述步骤S3中,在真空度0.5tor以下保持时间≥12min进行脱气。
进一步的,所述步骤S4中,钢水过热度控制在15~25℃,结晶器电磁搅拌参数:电流强度320~380A、频率2.5HZ,末端电磁搅拌电流强度320~380A、频率8HZ;铸坯凝固末端多点轻压下10~11mm。
本发明的有益效果:本发明提出一种中硫非调质钢及其制备方法,在中国专利CN202111421418.6的基础上,针对其存在的不足之处,通过调控非调质钢的组成,并利用精准控制转炉下渣量,控制合金加入时机,调节LF精炼工艺,延长RH在站时间等方法引入更多氧化物实现弥散分布,进而达到中硫非调质钢中硫化锰均匀分布、且带状组织、晶粒度也得到更好控制的效果,适用于所有中硫含量易切削非调质钢的制备。
具体实施方式
下面结合实施例和对比例进一步说明。
实施例1
本实施例的非调质钢,按重量百分比计,其组成为:C=0.38,Si=0.80,Mn=1.42,P=0.012,S=0.065,Cr=0.15,Al=0.010,V=0.015,O=0.0003,N=0.010,余量为铁和不可避免的杂质,其制备方法包括如下步骤:
S1.合格铁水进入转炉进行吹炼,终点C:0.07%,P:0.009%;
S2.LF工序快速造白渣、脱硫,白渣碱度为4.0,白渣量为15kg/t,白渣保持时间为35min;精炼过程中采用150kgSiC、30kg铝丸进行扩散脱氧,并根据目标成分加入5kg硅铁进行成分微调;钢水温度上升至1590℃后喂入514m氮线进行增氮;出站前喂入45m钙线进行钙处理,钙处理后再喂入160m硫线;
S3.RH在站时间为50min,在真空度0.5tor以下保持时间13min,RH出站前定H≤1.2ppm,并根据S含量检测结果补喂硫线;
S4.连铸过热度18~22℃,结晶器电磁搅拌参数:电流强度330A、频率2.5HZ,末端电磁搅拌参数:电流强度350A、频率8HZ;铸坯凝固末端多点轻压下10mm。
实施例2
本实施例的非调质钢,按重量百分比计,其组成为:C=0.40,Si=0.82,Mn=1.50,P=0.010,S=0.070,Cr=0.13,Al=0.012,V=0.02,O=0.0004,N=0.015,余量为铁和不可避免的杂质,其制备方法包括如下步骤:
S1.合格铁水进入转炉进行吹炼,终点C:0.10%,P:0.008%;
S2.LF工序快速造白渣、脱硫,白渣碱度为3.0,白渣量为12kg/t,白渣保持时间为38min;精炼过程中采用140kgSiC、34kg铝丸进行扩散脱氧,并根据目标成分加入3kg低碳铬铁、2kg钒铁进行成分微调;钢水温度上升至1600℃后喂入652m氮线进行增氮;出站前喂入50m钙线进行钙处理,钙处理后再喂入176m硫线;
S3.RH在站时间为46min,在真空度0.5tor以下保持时间15min,RH出站前定H≤1.1ppm,并根据S含量检测结果补喂硫线;
S4.连铸过热度19~24℃,结晶器电磁搅拌参数:电流强度350A、频率2.5HZ,末端电磁搅拌参数:电流强度320A、频率8HZ;铸坯凝固末端多点轻压下11mm。
实施例3
本实施例的非调质钢,按重量百分比计,其组成为:C=0.39,Si=0.68,Mn=1.48,P=0.008,S=0.068,Cr=0.14,Al=0.008,V=0.012,O=0.0004,N=0.018,余量为铁和不可避免的杂质,其制备方法包括如下步骤:
S1.合格铁水进入转炉进行吹炼,终点C:0.06%,P:0.011%;
S2.LF工序快速造白渣、脱硫,白渣碱度为5.0,白渣量为20kg/t,白渣保持时间为40min;精炼过程中采用130kgSiC、30kg铝丸进行扩散脱氧,并根据目标成分加入1.5kg钒铁进行成分微调;钢水温度上升至1595℃后喂入754m氮线进行增氮;出站前喂入48m钙线进行钙处理,钙处理后再喂入163m硫线;
S3.RH在站时间为46min,在真空度0.5tor以下保持时间12min,RH出站前定H≤1.0ppm,并根据S含量检测结果补喂硫线;
S4.连铸过热度16~22℃,结晶器电磁搅拌参数:电流强度380A、频率2.5HZ,末端电磁搅拌参数:电流强度380A、频率8HZ;铸坯凝固末端多点轻压下9mm。
对比例1
本对比例的非调质钢,按重量百分比计,其组成为:C=0.38,Si=0.53,Mn=1.62,P=0.010,S=0.068,Cr=0.28,Al=0.018,N=0.0177,其余为Fe和不可避免的杂质;其制备方法包括如下步骤:
S1.复吹转炉冶炼:铁水直接入炉,铁水和废钢总装入量147t,废钢占比32%,出钢温度1628℃,终点活度氧含量270ppm,出钢过程加入350kg铝铁进行沉淀脱氧,加入300kg高铝精炼合成渣+400kg石灰进行渣洗,采用滑板挡渣控制下渣量,确保钢包顶渣厚度38mm。
S2.精炼:LF炉精炼加入40kg铝粒+180kg碳化硅进行扩散脱氧,总渣量12.8kg/吨钢,白渣保持时间35min,精炼升温到1605℃时喂入803m硅氮线增氮;精炼脱氧完全后加入约200kg硅砂调整炉渣碱度,炉渣碱度4.2,调渣完成后先喂50m纯钙线进行钙化处理,喂完钙线后软吹氩气8min后再喂硫磺线增硫,喂线速度300m/min。
S3.真空脱气处理:在RH真空度0.5tor以下,保持时间13min,保真空全程环流吹氮气,破空后根据硫含量检测结果一次性喂入硫磺线调整到位,喂完硫线后先软吹氩气8min再喂80m纯钙线进行钙化处理,之后再软吹氩气15min上台浇注。
S4.连铸:采用0.80m/min恒拉速浇钢,一冷水2800L/min,二冷比水量为0.34L/kg,结晶器电磁搅拌参数:电流250A、频率2.5HZ,铸坯断面280mm×280mm。
对比例2
与实施例1的不同之处在于:非调质钢的组成不含V,制备方法不加入钒铁。
对比例3
与实施例1的不同之处在于:非调质钢的Si 0.70,制备方法顺钢流加入硅铁110kg,且LF工序未加入硅铁进行成分微调。
对比例4
与实施例1的不同之处在于:合金不顺钢流加入,在LF工序快速造白渣、脱硫之后加入。
对比例5
与实施例1的不同之处在于:RH在站时间为35min,在真空度0.5tor以下保持时间10min。
各实施例和对比例制备的非调质钢产品主要特性检测指标如表1所示。
表1实施例及对比例钢产品主要特性检测指标
检测表明:各实施例产品满足GB/T4162中AAA级超声波探伤缺陷检测质量合格要求。产品经客户试用,硫化锰分布均匀、带状组织、晶粒度也得到更好控制的效果。
Claims (6)
1.一种非调质钢的生产方法,其特征在于:钢的化学组成重量百分比为:C= 0.36~0.40,Si= 0.75~0.85,Mn =1.40~1.55,P≤0.015,S =0.055~0.075,Cr =0.12~0.16,Al =0.008~0.020,V= 0.01~0.03,O≤0.0006,N≤0.018,余量为铁和不可避免的杂质;钢的晶粒度为9.0级以上,带状组织≤1.0级;包括如下工艺步骤:
S1.合格铁水进入转炉进行吹炼,终点C≥0.05%、 P≤0.014%;
S2. LF工序快速造白渣、脱硫,精炼过程中采用SiC、铝丸进行扩散脱氧,并根据目标成分进行成分微调;钢水温度上升至≥1580℃后喂入氮线进行增氮;出站前喂入钙线进行钙处理,钙处理后再喂入硫线;
S3. RH在站时间≥45min,真空环流氮气,保持时间≥8min、软吹氩时间≥15min;
S4. 连铸拉速0.80~0.90m/min,过热度15~35℃;结晶器电磁搅拌参数:电流强度300~400A、频率2.5HZ,末端电磁搅拌参数:电流强度300~400A、频率8HZ;铸坯凝固末端多点轻压下8~12mm;铸坯尺寸 280 mm×280 mm×6m。
2.根据权利要求1所述的一种非调质钢的生产方法,其特征在于:钢的化学组成重量百分比为:C= 0.36~0.40,Si= 0.75~0.85,Mn =1.40~1.55,P≤0.015,S =0.055~0.075,Cr =0.12~0.16,Al =0.008~0.020,V= 0.01~0.03,O≤0.0006,N≤0.018,余量为铁和不可避免的杂质。
3.根据权利要求1所述的一种非调质钢的生产方法,其特征在于:所述步骤S1中,控制元素含量终点C≥0.05%、 P≤0.014%。
4.根据权利要求1所述的一种非调质钢的生产方法,其特征在于:所述步骤S2中,白渣碱度为3.0~5.0,白渣量为12~20kg/t,白渣保持时间≥30min。
5.根据权利要求1所述的一种非调质钢的生产方法,其特征在于:所述步骤S3中,在真空度0.5tor以下保持时间≥12min、软吹氩时间≥15min进行脱气。
6.根据权利要求1所述的一种非调质钢的生产方法,其特征在于:所述步骤S4中,拉速0.80~0.90m/min,钢水过热度控制在15~25℃,电流强度300~400A、频率2.5HZ,末端电磁搅拌参数电流强度300~400A、频率8HZ;铸坯凝固末端多点轻压下8~12mm;铸坯尺寸280 mm×280 mm×6m。
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