CN117144081B - 一种含Nb耐低温结构用热轧H型钢的轧制方法 - Google Patents
一种含Nb耐低温结构用热轧H型钢的轧制方法 Download PDFInfo
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- CN117144081B CN117144081B CN202311415311.XA CN202311415311A CN117144081B CN 117144081 B CN117144081 B CN 117144081B CN 202311415311 A CN202311415311 A CN 202311415311A CN 117144081 B CN117144081 B CN 117144081B
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
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- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
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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
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
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- C22C—ALLOYS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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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
- 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
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- Materials Engineering (AREA)
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- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
本发明公开了一种含Nb耐低温结构用热轧H型钢的轧制方法,包括以下步骤:铁水预处理、石墨烯添加剂的制备、转炉冶炼、LF炉外精炼、异型坯连铸、异型坯加热、轧制和冷却,所述冷却采用水冷,且冷却速度控制为10~20℃/s,终冷温度控制为100℃以下,用矫直机进行矫直、在上述矫直钢材表面涂覆粉末涂料,在紫外照射2h后,切定尺、打捆。本发明添加适量的Ce,有效改质夹杂物,形成细小含Ce稀土夹杂物,增强低温环境下钢的抗断裂能力,获得最优的低温韧性,该粉末涂料具有良好的韧性和低温性能,能进一步提高钢材的耐低温能力,石墨烯添加剂能够提高其防腐蚀的能力,使用寿命更长。
Description
技术领域
本发明属于钢材加工技术领域,具体涉及一种含Nb耐低温结构用热轧H型钢的轧制方法。
背景技术
近年来,随着高寒地区油气资源的不断开发,市场对于低温结构用热轧H型钢的需求越来越大。低温结构用热轧H型钢经常应用于环境条件十分恶劣的工作环境中,除受重力载荷外,还要考虑到风载荷、波浪载荷、河流载荷、冰载荷、地震载荷等的影响。
碳含量增加对钢的韧性、塑性和焊接性能有不利影响,一般控制碳≤0.09%;锰能够降低奥氏体转变为铁素体的相变温度,抑制先共析铁素体的形成,起到固溶强化的作用,但是过高的锰含量会使热影响区韧性变差,降低焊接性能;铌有显著的细化晶粒作用,主要体现在再加热过程中奥氏体晶粒的长大被抑制,在不损失韧性的情况下提高强度;添加少量的钛,与N结合在晶界沉淀析出TiN,抑制奥氏体晶粒长大和奥氏体晶界先共析铁素体的形成,起到强化的作用;铬能够提高强度和淬透性;镍可以提高钢板低温冲击韧性;磷易偏析,恶化低温用桥梁钢的焊接性能和低温冲击韧性;硫影响钢材的低温冲击韧性,增加各向异性,在生产中要严格控制磷和硫的含量。为了提高桥梁钢的综合性能,复合加入Nb-Ti-Cr-Ni,以获得比添加单一元素更好的微合金化处理效果。
专利文献CN112522601A(以下称文献1)公开一种生产含Nb低成本小中规格热轧H型钢的工艺方法,其通过合理的成分配比,并优化生产工艺方法,降低了热轧H型钢的生产成本,但得到的热轧H型钢在20℃的冲击功仅能满足≥34J,并不适合在高寒地区应用。
虽然说在低温地区使用时钢的腐蚀性影响较小,但是也会存在腐蚀的问题,随着使用时间推移,腐蚀对钢铁使用的影响格外重要,但是在钢铁加工过程中一般采用在金属表面镀一层保护层,但是这种在低温环境下会容易导致镀层与金属体分离,失去保护作用。
发明内容
本发明的目的在于提供一种含Nb耐低温结构用热轧H型钢的轧制方法,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:一种含Nb耐低温结构用热轧H型钢的轧制方法,包括以下步骤:
铁水预处理:包括脱硫、脱硅和脱磷;
石墨烯添加剂的制备:将粒径为2-5nm的石墨烯分散到无水乙醇中,并在紫外灯照射下1-2h,得到混合溶液,将Nb粉末加入到混合溶液中,在微波550W加热2h的条件下,并以1000rpm搅拌混合2-4h,得到混合溶液,利用离心机对上述混合溶液在5000rpm的转速下进行离心1h,获取底层粉末,然后将粉末放入真空干燥炉,在100-130℃下干燥24h,接着在220℃下冲入氢气30min,得到粉末,在上述粉末中添加熔炼添加剂进行研磨,得到石墨烯添加剂;
转炉冶炼:采用顶底复吹转炉冶炼,将铁水、金属原料和石墨烯添加剂加入到炉体中冶炼;
LF炉外精炼:精炼过程中先充分搅拌化渣,造黄白渣;
异型坯连铸:采用浸入式扁平水口全保护浇铸;
异型坯加热:将异型连铸坯在热炉中进行加热,铸坯的加热温度1200-1400℃,保温时间2-4小时,出炉后利用高压水进行除鳞;
轧制和冷却,所述冷却采用水冷,且冷却速度控制为10~20℃/s,终冷温度控制为100℃以下,用矫直机进行矫直;
在上述矫直钢材表面涂覆粉末涂料,在紫外照射2h后,切定尺、打捆。
优选的是,所述H型钢的化学成分按重量比计为:C 0.0610-0.0910%、Si 0.3100-0.6520%、Mn 1.2200-1.8320%、Cr 0.2100-0.2520%、Nb 0.0320-0.0480%、Ti 0.1120-0.1620%、Ce 0.0008-0.0010%、P≤0.020%、S≤0.020%,其余为铁和不可避免的杂质。
上述任一方案中优选的是,所述H型钢的化学成分按重量比计为:C 0.0750%、Si0.4500%、Mn 1.5500%、Cr 0.2300%、Nb 0.04100%、Ti 0.1340%、Ce 0.0009%、P 0.015%、S0.015%,其余为铁和不可避免的杂质,质量分数共计100%。
上述任一方案中优选的是,所述粉末涂料包括聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡,其中聚丙烯降解树脂、聚酯树脂将聚丙烯质量比为3:2-27。
上述任一方案中优选的是,所述粉末涂料的制备过程包括将聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡和颜料加入混料机,在常温下混合,然后经挤塑机挤出,压片机压片,磨粉过100-200目筛,即得粉末涂料。
上述任一方案中优选的是,所述脱硫的过程包括,向铁水中加入脱硫剂,便加入边以20rpm的速度进行搅拌30min,然后以5℃/min的速度升温,当升温至60℃时停止搅拌,并以10℃/min的速度升温,直至120℃停止升温,并以此温度保持20min,然后将脱硫后的铁水过脱硫滤芯,完成脱硫。
上述任一方案中优选的是,所述脱硫剂按重量份包括CaO 100-120份、SiO2 10-15份、Al 1-5份和BaO 0.5-1份。
上述任一方案中优选的是,所述脱硫滤芯包括活性碳酸钙8-11%、氧化钙48-55%、氧化镁0.3-0.7%、碳化钙17-22%、氧化钡2.5-3.5%、粉状硅酸钠4-6%、二氧化硅4.5-7%、石膏粉4-8%,将上述原料混合后,加水成型后放入到膨化箱,在9-12个大气压下,通入150-200℃热空气持续2-10分钟形成多孔状固体,即为脱硫滤芯。
上述任一方案中优选的是,所述脱磷的过程包括,向铁水中加入脱磷剂,静置30-60min后,然后以30rpm速度搅拌15-20min,接着再静置30min,完成脱磷,所述脱磷剂包括硫酸亚铁、氯化镁、聚合氯化铝,且三者按质量比为:1-2:6-7:3-4。
上述任一方案中优选的是,所述脱硅的过程包括,将脱硅剂提前加入到铁水罐空罐中,然后再向铁水罐中装入铁水,高炉受铁后到炼钢折铁时完成脱硅处理,所述脱硅剂的加入量为每吨铁水加入40-60kg,所述脱硅剂包括高炉除尘灰22-48%,萤石粉22-28%,其余为转炉除尘灰。
本发明的技术效果和优点:该含Nb耐低温结构用热轧H型钢的轧制方法在原料中添加了Ce,Ce的存在减小了铁素体的尺寸,改善了珠光体的形貌,Ce还能使Al2O3和MnS+Ti4C2S2夹杂物分别变质成椭球CeAlO3和球状Ce2O2S+Ti4C2S2复合夹杂物,更容易去除,形成的Ce2O2S夹杂物细小,可作为异质形核点细化钢的微观结构,而且Ce的添加量为0.0008-0.0010%,有效改质夹杂物,形成细小含Ce稀土夹杂物,增强低温环境下钢的抗断裂能力,获得最优的低温韧性,而且在钢材表面涂覆粉末涂料,粉末涂料包括聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡,该粉末涂料具有良好的韧性和低温性能,能进一步提高钢材的耐低温能力;在熔炼的过程中加入了石墨烯添加剂,使得石墨烯分布在钢材中,而不是贴附于表面形成保护层,保护层会发生脱落的情况,而石墨烯分布在钢铁中则不会出现这个情况,且分布在钢材中,能够提高其防腐蚀的能力,使用寿命更长。
具体实施方式
下面将结合本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例一
一种含Nb耐低温结构用热轧H型钢的轧制方法,包括以下步骤:
铁水预处理:包括脱硫、脱硅和脱磷;
石墨烯添加剂的制备:将粒径为2-5nm的石墨烯分散到无水乙醇中,并在紫外灯照射下1-2h,得到混合溶液,将Nb粉末加入到混合溶液中,在微波550W加热2h的条件下,并以1000rpm搅拌混合2-4h,得到混合溶液,利用离心机对上述混合溶液在5000rpm的转速下进行离心1h,获取底层粉末,然后将粉末放入真空干燥炉,在100-130℃下干燥24h,接着在220℃下冲入氢气30min,得到粉末,在上述粉末中添加熔炼添加剂进行研磨,得到石墨烯添加剂;
转炉冶炼:采用顶底复吹转炉冶炼,将铁水、金属原料和石墨烯添加剂加入到炉体中冶炼;
LF炉外精炼:精炼过程中先充分搅拌化渣,造黄白渣;
异型坯连铸:采用浸入式扁平水口全保护浇铸;
异型坯加热:将异型连铸坯在热炉中进行加热,铸坯的加热温度1200-1400℃,保温时间2-4小时,出炉后利用高压水进行除鳞;
轧制和冷却,所述冷却采用水冷,且冷却速度控制为10~20℃/s,终冷温度控制为100℃以下,用矫直机进行矫直;
在上述矫直钢材表面涂覆粉末涂料,在紫外照射2h后,切定尺、打捆。
粉末涂料包括聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡,其中聚丙烯降解树脂、聚酯树脂将聚丙烯质量比为3:2-27,其制备方法为将聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡和颜料加入混料机,在常温下混合,然后经挤塑机挤出,压片机压片,磨粉过100-200目筛,即得粉末涂料。
硫的过程包括,向铁水中加入脱硫剂,脱硫剂按重量份包括CaO 110份、SiO2 13份、Al 3份和BaO 0.8份,便加入边以20rpm的速度进行搅拌30min,然后以5℃/min的速度升温,当升温至60℃时停止搅拌,并以10℃/min的速度升温,直至120℃停止升温,并以此温度保持20min,然后将脱硫后的铁水过脱硫滤芯,完成脱硫,脱硫滤芯包括活性碳酸钙10%、氧化钙50%、氧化镁0.5%、碳化钙20%、氧化钡3%、粉状硅酸钠5%、二氧化硅4.5%、石膏粉7%,将上述原料混合后,加水成型后放入到膨化箱,在9-12个大气压下,通入150-200℃热空气持续2-10分钟形成多孔状固体,即为脱硫滤芯。
脱磷的过程包括,向铁水中加入脱磷剂,静置30-60min后,然后以30rpm速度搅拌15-20min,接着再静置30min,完成脱磷,脱磷剂包括硫酸亚铁、氯化镁、聚合氯化铝,且三者按质量比为:1:6:3,脱磷剂的制备方法:取硫酸亚铁、氯化镁、聚合氯化铝分别50Kg、300Kg、150Kg,在空气湿度小于50%的环境下将硫酸亚铁、氯化镁和聚合氯化铝搅拌均匀,再在45℃烘30分钟制备得到脱磷剂500Kg。
脱硅的过程包括,将脱硅剂提前加入到铁水罐空罐中,然后再向铁水罐中装入铁水,高炉受铁后到炼钢折铁时完成脱硅处理,所述脱硅剂的加入量为每吨铁水加入40-60kg,脱硅剂包括高炉除尘灰30%,萤石粉30%,其余为转炉除尘灰,脱硅剂制备为将所需原料破碎、碾压、研磨,使其中粒径小于0.074mm的比例达到70%以上;然后将混合料原料混料设备搅拌混合均匀,将混合粉料烘干备用。
对于生产后的H型钢屈服强度、拉伸强度、-40℃的冲击韧性、延伸率和耐酸碱性均进行测试,具体如下表2所示,其中耐酸碱性按照GB/T9274《色漆和清漆耐液体介质的测定》标准分别对上述耐腐蚀涂层L1-L8的耐酸性进行测定。浸泡法,将耐腐蚀涂层L1-L8分别浸泡在室温30℃下的酸、碱溶液中,各 浸泡24小时,容器加盖,结束后迅速用水清理耐腐蚀涂层L1-L8,并观察材料表面发生的现 象。酸溶液和碱溶液分别为浓度是10重量%的硫酸水溶液和10重量%的氢氧化钠水溶液。
对比例1:
对比例1按照实施例1的操作进行,不同之处仅在于含Nb耐低温结构用热轧H型钢的化学成分不同,具体如下表1所示。对对比例1得到的H型钢进行屈服强度、拉伸强度、-40℃的冲击韧性、延伸率和耐酸碱性均进行测试,具体如下表2所示。
对比例2:
本对比例与实施例1中H型的化学组分相同,不同之处在于没有添加石墨烯添加剂。对对比例2得到的H型钢进行屈服强度、拉伸强度、-40℃的冲击韧性、延伸率和耐酸碱性均进行测试,具体如下表2所示。
表1:各实例的H型钢的化学成分(重量比)
实例 | C(%) | Si(%) | Mn(%) | Cr(%) | Nb(%) | Ti(%) | Ce(%) | P(%) | S(%) |
实施例1 | 0.0750 | 0.4500 | 1.5500 | 0.2300 | 0.04100 | 0.1340 | 0.0009 | 0.015 | 0.015 |
对比例1 | 0.0750 | 0.4500 | 1.5500 | 0.2300 | 0.04100 | 0.1340 | 0.0000 | 0.015 | 0.015 |
对比例2 | 0.0750 | 0.4500 | 1.5500 | 0.2300 | 0.04100 | 0.1340 | 0.0009 | 0.015 | 0.015 |
表2:
实例 | 屈服强度(MPa) | 拉伸强度(MPa) | -40℃的冲击韧性(J) | 延伸率(%) | 耐酸碱性 |
实施例1 | 430 | 560 | 173 | 28 | 无失光、变色、脱落、起泡、斑点等情况 |
对比例1 | 390 | 503 | 98 | 22 | 无失光、变色、脱落、起泡、斑点等情况 |
对比例2 | 415 | 533 | 161 | 25 | 脱落 |
由表1和表2可以看出,实施例1生产的热轧H型钢具有优异的耐低温韧性和防腐蚀性,力学满足,屈服强度≥430MPa,拉伸强度≥560MPa,而且-40℃的冲击韧性≥170J,延伸率≥28%。对比例1失去了Ce之后其-40℃的冲击韧性能力损失很大,仅为98J。对比例2没有石墨烯添加剂的添加之后,其防腐蚀能力大大减弱。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (1)
1.一种含Nb耐低温结构用热轧H型钢的轧制方法,其特征在于:包括以下步骤:
铁水预处理:包括脱硫、脱硅和脱磷;
石墨烯添加剂的制备:将粒径为2-5nm的石墨烯分散到无水乙醇中,并在紫外灯照射下1-2h,得到混合溶液一,将Nb粉末加入到混合溶液一中,在微波550W加热2h的条件下,并以1000rpm搅拌混合2-4h,得到混合溶液二,利用离心机对上述混合溶液二在5000rpm的转速下进行离心1h,获取底层粉末,然后将粉末放入真空干燥炉,在100-130℃下干燥24h,接着在220℃下冲入氢气30min,得到粉末,在上述粉末中添加熔炼添加剂进行研磨,得到石墨烯添加剂;
转炉冶炼:采用顶底复吹转炉冶炼,将铁水、金属原料和石墨烯添加剂加入到炉体中冶炼;
LF炉外精炼:精炼过程中先充分搅拌化渣,造黄白渣;
异型坯连铸:采用浸入式扁平水口全保护浇铸;
异型坯加热:将异型连铸坯在热炉中进行加热,铸坯的加热温度1200-1400℃,保温时间2-4小时,出炉后利用高压水进行除鳞;
轧制和冷却,所述冷却采用水冷,且冷却速度控制为10~20℃/s,终冷温度控制为100℃以下,用矫直机进行矫直;
在矫直钢材表面涂覆粉末涂料,在紫外照射2h后,切定尺、打捆,得到H型钢;
所述H型钢的化学成分按重量比计为:C 0.0750%、Si 0.4500%、Mn 1.5500%、Cr0.2300%、Nb 0.04100%、Ti 0.1340%、Ce 0.0009%、P 0.015%、S 0.015%,其余为铁和不可避免的杂质,质量分数共计100%;
粉末涂料包括聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡,其中聚丙烯降解树脂、聚酯树脂将聚丙烯质量比为3:2-27,其制备方法为将聚丙烯降解树脂、聚酯树脂、固化剂、增光剂、流平剂、安息香、钛白粉、硫酸钡和颜料加入混料机,在常温下混合,然后经挤塑机挤出,压片机压片,磨粉过100-200目筛,即得粉末涂料;
脱硫的过程包括,向铁水中加入脱硫剂,脱硫剂按重量份包括CaO 110份、SiO2 13份、Al3份和BaO 0.8份,边加入边以20rpm的速度进行搅拌30min,然后以5℃/min的速度升温,当升温至60℃时停止搅拌,并以10℃/min的速度升温,直至120℃停止升温,并以此温度保持20min,然后将脱硫后的铁水过脱硫滤芯,完成脱硫,脱硫滤芯包括活性碳酸钙10%、氧化钙50%、氧化镁0.5%、碳化钙20%、氧化钡3%、粉状硅酸钠5%、二氧化硅4.5%、石膏粉7%,将上述原料混合后,加水成型后放入到膨化箱,在9-12个大气压下,通入150-200℃热空气持续2-10分钟形成多孔状固体,即为脱硫滤芯;
脱磷的过程包括,向铁水中加入脱磷剂,静置30-60min后,然后以30rpm速度搅拌15-20min,接着再静置30min,完成脱磷,脱磷剂包括硫酸亚铁、氯化镁、聚合氯化铝,且三者按质量比为:1:6:3,脱磷剂的制备方法:取硫酸亚铁、氯化镁、聚合氯化铝分别50Kg、300Kg、150Kg,在空气湿度小于50%的环境下将硫酸亚铁、氯化镁和聚合氯化铝搅拌均匀,再在45℃烘30分钟制备得到脱磷剂500Kg;
脱硅的过程包括,将脱硅剂提前加入到铁水罐空罐中,然后再向铁水罐中装入铁水,高炉受铁后到炼钢折铁时完成脱硅处理,所述脱硅剂的加入量为每吨铁水加入40-60kg,脱硅剂包括高炉除尘灰30%,萤石粉30%,其余为转炉除尘灰,脱硅剂制备为将所需原料破碎、碾压、研磨,使其中粒径小于0.074mm的比例达到70%以上;然后将混合料原料混料设备搅拌混合均匀,将混合粉料烘干备用;
所述H型钢的屈服强度=430MPa,拉伸强度=560MPa,而且-40℃的冲击韧性=170J,延伸率=28%,耐酸碱性为无失光、变色、脱落、起泡和斑点情况。
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