CN115446115A - 一种提高b级船用中厚板轧制效率的方法 - Google Patents
一种提高b级船用中厚板轧制效率的方法 Download PDFInfo
- Publication number
- CN115446115A CN115446115A CN202211165119.5A CN202211165119A CN115446115A CN 115446115 A CN115446115 A CN 115446115A CN 202211165119 A CN202211165119 A CN 202211165119A CN 115446115 A CN115446115 A CN 115446115A
- Authority
- CN
- China
- Prior art keywords
- equal
- less
- percent
- rolling
- medium plate
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
-
- 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
- C22C38/08—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/16—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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
本发明提供一种提高B级船用中厚板轧制效率的方法,通过对B级船用中厚板成分及其轧制工艺进行局部优化,降低坯料加热温度减少煤气消耗,采用常规轧制工艺缩短吨钢轧制时间,提高了轧制效率和轧制节奏,进而缩短了坯料在加热炉内的总加热时间,进一步起到了降低吨钢煤气消耗的目的。
Description
技术领域
本发明属于金属轧制技术领域,涉及一种提高B级船用中厚板轧制效率的方法,具体为利用炉卷轧机生产厚度规格为6-18mm B级船用中厚板时提高轧制效率的方法。
背景技术
我国经历了四十余年的改进和创新,当前中厚板产品的生产工艺比较成熟,生产过程控制朝向标准化、数字化、自动化方向发展,品质稳定性大幅度提升,我国的钢铁产量已能满足市场需求。与此同时,钢铁产能提升的背后是巨大的能源消耗,给环保带来较大的压力,同时也带来了产品同质化严重的问题,尤其是船用中厚板产品,近年来其市场恶性化竞争逐渐显现。为此,今后中厚板产品尤其是船板的生产,急需进一步优化生产工艺,在现在的基础上进一步降低能源消耗,压缩生产成本,提高产品的市场竞争力。
发明内容
为了解决上述问题,本发明根据现有的中厚板炉卷轧线特点,针对6-18mm厚度规格B级船用中厚板进行成分及轧制工艺的优化,提高轧制效率,同时降低吨钢轧制成本。
本发明具体采用如下技术方案:
一种提高B级船用中厚板轧制效率的方法,其特征在于所述B级船用中厚板的化学成分及质量百分比如下:C≤0.20%, Mn:0.6%-1.2%,P≤0.04%,S≤0.04%,Si≤0.50%,Nb≤0.05%,Ni≤0.3%, Cr≤0.3%, Cu≤0.35%,Mo≤0.08%,Ti≤0.02%,其余为Fe和不可避免的杂质;
轧钢工艺采用非TMCP工艺,通过控制坯料加热制度,使钢板终轧温度命中预先设定的目标范围;其中,坯料加热制度为:总在炉时间≥90min,均热时间≥18min,温度均匀性≤15℃,出炉温度:1120℃-1160℃;钢板目标终轧温度为810℃±20℃。
优选地,所述B级船用中厚板的化学成分及质量百分比如下:C:0.16%-0.20%, Mn:0.6%-0.8%,P≤0.02%,S≤0.01%,Si:0.10%-0.30%,Nb≤0.05%,Ni≤0.1%, Cr≤0.1%, Cu≤0.1%,Mo≤0.08%,Ti≤0.02%,其余为Fe和不可避免的杂质。
优选地,坯料出炉后经过除鳞—轧制—矫直工序,轧制工序第1、2、6道次需对轧件上下表面进行精除鳞。
优选地,钢板拉伸断面伸长率≥22%、抗拉强度为400-520 MPa之间、屈服强度≥235 Mpa、冲击值≥18。
优选地,生产投用的坯料规格限定为:厚度150mm;宽度≤3200mm;长度≤17600mm。
优选地,生产的钢板规格限定为:厚度:6-18mm;宽度:1600-3150mm;长度:5-24m。
有益效果:
本发明对B级船用中厚板成分及其轧制工艺进行了局部优化,得到的钢板性能符合技术要求,主要成分范围要求如下:C≤0.20%, Mn:0.6%-1.2%,P≤0.04%,S≤0.04%,Si≤0.50%,Nb≤0.05%,Ni≤0.3%, Cr≤0.3%, Cu≤0.35%,Mo≤0.08%,Ti≤0.02%;轧制工艺方面,采用非TMCP工艺,即采用常规轧制方案轧制,通过控制坯料加热温度,使钢板终轧温度命中预先设定的目标范围,通过降低坯料加热温度(正常加热温度:1200±30℃)减少了煤气消耗,通过常规轧制工艺缩短了吨钢轧制时间,提高了轧制效率和轧制节奏,进而缩短了坯料在加热炉内的总加热时间,进一步起到了降低吨钢煤气消耗的目的,且最终得到的钢板性能与采用现有TMCP工艺生产时相同,产品整体质量满足技术要求。据测算,成分和工艺优化后中厚板炉卷轧线轧制6-18mm厚度规格B级船板时,轧钢效率可提高15%-20%,吨钢生产成本可降低5%-10%。
具体实施方式
以下结合实施例对本发明做近一步详细说明,应当理解的是,此处所描述的具体实施例仅用于解释和说明本发明,但本发明不局限于以下实施例。
实施例1
本实施例提供了一种提高B级船用中厚板轧制效率的方法,所使用的坯料化学成分如下:C:0.18%, Mn:0.65%,P:0.02%,S:0.006%,Si:0.2%,Nb:0.003%,Ni:0.02%, Cr:0.03%,Cu:0.02%,Mo:0.004%,Ti:0.002%,其余为Fe和不可避免的杂质。
轧钢工艺采用非TMCP工艺,通过控制坯料加热制度,使钢板终轧温度命中预先设定的目标范围。投用坯料的尺寸为150mm×2895mm×7715mm,加热过程的坯料入炉温度178℃,出炉温度1156℃,在炉总时间129min,均热时间≥18min,温度均匀性≤15℃,生产的钢板尺寸为8mm×2860mm×10000mm。
坯料出炉后通过辊道传输,首先进入除鳞箱,对上下表面进行粗除鳞,粗除鳞结束后通过辊道快速传输到轧机区域,进入轧制阶段。轧件由四辊可逆式炉卷轧机进行往复且连续轧制,轧制过程中在1、2、6道次对轧件精除鳞,经过11道次的轧制后,轧件温度为816℃。
轧制完成后轧件通过辊道传输到在线热矫直机区域进行矫直。矫直完成后的轧件上冷床,通过剪切、取样、喷印、表检、等工序,最终获得符合订单要求的产品并入库。钢板性能满足:拉伸断面伸长率≥22%、抗拉强度为400-520 MPa之间、屈服强度≥235 Mpa、冲击值≥18。
实施例2
本实施例提供了一种提高B级船用中厚板轧制效率的方法,所使用的坯料化学成分如下:C:0.17%, Mn:0.70%,P:0.02%,S:0.01%,Si:0.3%,Nb:0.005%,Ni:0.02%, Cr:0.08%,Cu:0.03%,Mo:0.004%,Ti:0.002%,其余为Fe和不可避免的杂质。
轧钢工艺采用非TMCP工艺,通过控制坯料加热制度,使钢板终轧温度命中预先设定的目标范围。投用坯料的尺寸为150mm×2635mm×7913mm,加热过程的坯料入炉温度172℃,出炉温度1149℃,在炉总时间127min,均热时间≥18min,温度均匀性≤15℃,生产的钢板尺寸为10mm×2800mm×12000mm。
坯料出炉后通过辊道传输,首先进入除鳞箱,对上下表面进行粗除鳞,粗除鳞结束后通过辊道快速传输到轧机区域,进入轧制阶段。轧件由四辊可逆式炉卷轧机进行往复且连续轧制,轧制过程中在1、2、6道次对轧件精除鳞,经过11道次的轧制后,轧件温度为823℃。
轧制完成后轧件通过辊道传输到在线热矫直机区域进行矫直。矫直完成后的轧件上冷床,通过剪切、取样、喷印、表检、等工序,最终获得符合订单要求的产品并入库。钢板性能满足:拉伸断面伸长率≥22%、抗拉强度为400-520 MPa之间、屈服强度≥235 Mpa、冲击值≥18。
实施例3
本实施例提供了一种提高B级船用中厚板轧制效率的方法,所使用的坯料化学成分如下:C:0.18%, Mn:0.80%,P:0.03%,S:0.01%,Si:0.5%,Nb:0.003%,Ni:0.01%, Cr:0.04%,Cu:0.02%,Mo:0.004%,Ti:0.002%,其余为Fe和不可避免的杂质。
轧钢工艺采用非TMCP工艺,通过控制坯料加热制度,使钢板终轧温度命中预先设定的目标范围。投用坯料的尺寸为150mm×2900mm×8235mm,加热过程的坯料入炉温度156℃,出炉温度1151℃,在炉总时间145min,均热时间≥18min,温度均匀性≤15℃。生产的钢板尺寸为8mm×2650mm×12000mm。
坯料出炉后通过辊道传输,首先进入除鳞箱,对上下表面进行粗除鳞,粗除鳞结束后通过辊道快速传输到轧机区域,进入轧制阶段。轧件由四辊可逆式炉卷轧机进行往复且连续轧制,轧制过程中在1、2、6道次对轧件精除鳞,经过11道次的轧制后,轧件温度为825℃。
轧制完成后轧件通过辊道传输到在线热矫直机区域进行矫直。矫直完成后的轧件上冷床,通过剪切、取样、喷印、表检、等工序,最终获得符合订单要求的产品并入库。钢板性能满足:拉伸断面伸长率≥22%、抗拉强度为400-520 MPa之间、屈服强度≥235 Mpa、冲击值≥18。
除上述实施例外,本发明还可用于其它规格产品的生产。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (6)
1.一种提高B级船用中厚板轧制效率的方法,其特征在于所述B级船用中厚板的化学成分及质量百分比如下:C≤0.20%, Mn:0.6%-1.2%,P≤0.04%,S≤0.04%,Si≤0.50%,Nb≤0.05%,Ni≤0.3%, Cr≤0.3%, Cu≤0.35%,Mo≤0.08%,Ti≤0.02%,其余为Fe和不可避免的杂质;
轧钢工艺采用非TMCP工艺,通过控制坯料加热制度,使钢板终轧温度命中预先设定的目标范围;其中,坯料加热制度为:总在炉时间≥90min,均热时间≥18min,温度均匀性≤15℃,出炉温度:1120℃-1160℃;钢板目标终轧温度为810℃±20℃。
2.如权利要求1所述的提高B级船用中厚板轧制效率的方法,其特征在于所述B级船用中厚板的化学成分及质量百分比如下:C:0.16%-0.20%, Mn:0.6%-0.8%,P≤0.02%,S≤0.01%,Si:0.10%-0.30%,Nb≤0.05%,Ni≤0.1%, Cr≤0.1%, Cu≤0.1%,Mo≤0.08%,Ti≤0.02%,其余为Fe和不可避免的杂质。
3.如权利要求1所述的提高B级船用中厚板轧制效率的方法,其特征在于坯料出炉后经过除鳞—轧制—矫直工序,轧制工序第1、2、6道次需对轧件上下表面进行 精 除鳞。
4.如权利要求1所述的提高B级船用中厚板轧制效率的方法,其特征在于钢板拉伸断面伸长率≥22%、抗拉强度为400-520 MPa之间、屈服强度≥235 Mpa、冲击值≥18。
5.如权利要求1所述的提高B级船用中厚板轧制效率的方法,其特征在于生产投用的坯料规格限定为:厚度150mm;宽度≤3200mm;长度≤17600mm。
6.如权利要求1所述的提高B级船用中厚板轧制效率的方法,其特征在于生产的钢板规格限定为:厚度:6-18mm;宽度:1600-3150mm;长度:5-24m。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211165119.5A CN115446115A (zh) | 2022-09-23 | 2022-09-23 | 一种提高b级船用中厚板轧制效率的方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211165119.5A CN115446115A (zh) | 2022-09-23 | 2022-09-23 | 一种提高b级船用中厚板轧制效率的方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
CN115446115A true CN115446115A (zh) | 2022-12-09 |
Family
ID=84306525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202211165119.5A Pending CN115446115A (zh) | 2022-09-23 | 2022-09-23 | 一种提高b级船用中厚板轧制效率的方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN115446115A (zh) |
-
2022
- 2022-09-23 CN CN202211165119.5A patent/CN115446115A/zh active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN109266815B (zh) | 在线淬火高强钢板的板形控制方法 | |
CN101265550B (zh) | 一种微合金高强度钢冲压用冷轧汽车板 | |
CN106636747B (zh) | 一种采用中厚板轧机二次退火生产工业纯钛板的制造方法 | |
CN110791712A (zh) | 一种核电站安全壳用SA738GrB钢板及制造方法 | |
CN114525453A (zh) | 一种薄规格桥梁用钢及其生产方法 | |
CN106702270B (zh) | 厚规格高表面质量热轧开平板及其制造方法 | |
CN114959458A (zh) | 一种dh36海洋工程结构用热轧h型钢的制造方法 | |
CN112077165B (zh) | 一种50Mn薄规格高碳冷轧钢板轧制方法 | |
CN109182918A (zh) | 一种钒铌微合金化低碳热轧窄带钢及其制备方法 | |
CN114405997B (zh) | 一种薄规格钢板的生产方法 | |
CN114369753B (zh) | 一种基于柔性轧制技术生产多强度级别合金结构钢的方法 | |
CN115446115A (zh) | 一种提高b级船用中厚板轧制效率的方法 | |
CN115446114A (zh) | 一种提高a36级船用中厚板轧制效率的方法 | |
CN115537524A (zh) | 一种提高a级船用中厚板轧制效率的方法 | |
CN101538681A (zh) | 一种生产屈服强度700MPa级高强钢的方法 | |
CN115537636A (zh) | 一种提高a32级船用中厚板轧制效率的方法 | |
CN115532848A (zh) | 一种提高q355中厚板结构钢轧制效率的方法 | |
CN110548763B (zh) | 一种减少厚板瓢曲的方法 | |
CN115430721A (zh) | 一种提高q345r中厚板容器钢轧制效率的方法 | |
CN115430720A (zh) | 一种提高q245r中厚板容器钢轧制效率的方法 | |
CN115555410A (zh) | 一种提高s275系列中厚板结构钢轧制效率的方法 | |
CN117816753A (zh) | 一种提高q235中厚板结构钢轧制效率的方法 | |
CN117772815A (zh) | 一种提高s355系列中厚板结构钢轧制效率的方法 | |
CN112536321A (zh) | 一种小规格轴承钢的控冷方法 | |
CN117816754A (zh) | 一种提高q345b中厚板结构钢轧制效率的方法 |
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 |