CN115369302A - 一种造纸辊用q235-t钢板的生产方法 - Google Patents
一种造纸辊用q235-t钢板的生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000010583 slow cooling Methods 0.000 claims abstract description 14
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 238000009489 vacuum treatment Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- 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
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
本发明公开了一种造纸辊用Q235B‑T钢板的生产方法,钢板的化学成分按质量百分比含量为C:0.15~0.18%;Mn:0.70~0.80%;Si:0.15~0.25%,S≤0.010%,P≤0.018%,Als 0.020~0.040%,Ti:0.01~0.02%,造纸辊材料的生产方法:转炉冶炼→LF精炼→真空冶炼→连铸→加热→轧制→缓冷;加热工序:厚度250mm板,坯在步进式加热炉加热,一加段温度工艺要求1100±50℃,二加段温度工艺要求1245±25℃,总在炉时间≥200min,均热时间≥42min;采用两阶段控制轧制控制,粗轧的开轧温度为1070‑1120℃,粗轧阶段的单道次压下率≥20%,精轧阶段的开轧温度≤950℃,中间坯待温厚度为成品厚度的2.2~4倍,精轧阶段的道次压下率为15%~18%以上,控轧的总压下率大于50%,终轧温度780‑850℃;缓冷工序缓冷时间≥24小时。
Description
技术领域
本发明涉及一种造纸辊用Q235-T钢板的生产方法。
背景技术
造纸辊的加工流程为:钢板加工成直缝焊管-焊缝探伤-焊管退火-焊管表面磨削3-5mm-粗磨-精磨-PT渗透探伤-辊面抛光-电镀铬,故造纸辊要求母材钢板具有表面质量高、冲击性能高、探伤质量好的特性,造纸辊用普通的Q235B钢板表面加工3-5mm后容易出现凹坑、白点等缺陷,无法满足造纸辊的高表面质量使用要求。
发明内容
本发明在于提供一种造纸辊用碳素结构钢Q235-T钢板生产方法。通过本方法生产的造纸辊用Q235B-T与造纸辊用普通Q235B 相比,具有高表面质量、高韧性、高探伤性能的优点,满足用户使用要求。
本发明的目的是通过以下技术方案来实现的:
一种造纸辊用Q235B-T钢板的生产方法,通过成分设计,控制轧制工艺技术获得高质量的造纸辊母材钢板;
1)、钢板的化学成分按质量百分比含量为C:0.15~0.18%; Mn:0.70~0.80%;Si:0.15~0.25%,S ≤0.010%, P≤0.018%,Als 0.020~0.040%,Ti:0.01~0.02%,其余为Fe和不可避免杂质元素;
2)、造纸辊材料的生产方法:转炉冶炼→LF精炼→真空冶炼→连铸→加热→轧制→缓冷;
炼钢工序:转炉采用脱磷钢水 P≤0.018%,LF脱硫钢水S ≤0.010%,真空处理脱除H、N有害元素,H≤0.0004%,N≤0.0060%,在连铸设备得到厚度250mm连铸坯;
3)、加热工序:厚度250mm板,坯在步进式加热炉加热,一加段温度工艺要求1100±50℃,二加段温度工艺要求1245±25℃,均热段温度工艺要求1225±25℃,总在炉时间≥200min,均热时间≥42min;
4)、轧制工序:采用两阶段控制轧制控制,粗轧的开轧温度为1070-1120℃,粗轧阶段的单道次压下率≥20%,精轧阶段的开轧温度≤950℃,中间坯待温厚度为成品厚度的2.2~4倍,精轧阶段的道次压下率为15%~18%以上,控轧的总压下率大于50%, 终轧温度780-850℃;
5)、缓冷工序:厚度≥20mm Q235B-T 钢板表面温度≥400℃下线堆垛缓冷,缓冷时间≥24小时。
本发明生产的最大厚度为40mm,钢板牌号为Q235B-T,力学性能满足GB/T700-2006标准的相关技术要求,表面质量、冲击和探伤性能较普通Q235B有较大提高。
为了保证造纸辊母材Q235B-T钢板表面加工3-5mm后,表面质量能满足使用要求,主要从以下两方面进行确保:(1)成分设计降低S、P有害元素,造纸辊普通Q235B 化学成分S≤0.030%,P≤0.030%,本发明造纸辊用Q235B-T化学成分S≤0.010%,P≤0.018%。(2)厚度≥20mm Q235B-T 钢板,表面温度≥400℃下线堆垛缓冷,缓冷时间≥24小时,保证钢板扩氢充分,脱除钢板中的氢,防止钢板表面和心部出现氢致裂纹,提高钢板表面和内部质量。
为了细化晶粒,改善钢板综合力学性能,中间坯待温厚度为成品厚度的2.2~4倍,精轧阶段的道次压下率为15%~18%以上,控轧的总压下率大于50%, 终轧温度780-850℃。
通过合理的成分设计、转炉冶炼,LF精炼、真空冶炼,连铸、加热、轧制、缓冷、剪切、取样、性能检测生产的造纸辊用Q235B-T钢板的综合力学性能合格率达到100%,尤其是冲击性能有较大富余量,实物冲击性能可以满达到D级要求,探伤合格率100%,表面经过加工后无凹坑和白点等缺陷,此发明方法生产的Q235B-T钢板满足造纸辊的高质量要求。
具体实施方式:
下面结合具体实施例对本发明进行更详细的说明。
本发明提供一种造纸辊用Q235-T钢板的生产方法,用下述成分配比以及生产方法:C:0.15~0.18%; Mn:0.70~0.80%;Si: 0.15~0.25%,S ≤0.010%, P≤0.018%,Als0.020~0.040%,Ti:0.01~0.02%,N:0~0.0060%其余为Fe和不可避免杂质元素。生产最大厚度为40mm。
实施例1:原料铁水经过铁水深度脱硫,转炉顶底吹炼,钢包吹氩,LF精炼、RH真空处理以及连铸工艺,得到表1的化学成分,板坯厚度为250mm,板坯均热段温度1230℃,加热时间200min,均热时间43min,第一阶段开轧温度1100℃,第二阶段开轧温度880℃,中间坯的厚度为78mm, 轧件厚度20mm,终轧温度792℃,轧后采用堆冷方式冷却,堆冷时间≥24小时,获得钢板力学性能检验结果见表2。
钢板经探伤检测后满足NB/T 47013.3 Ⅱ级要求。
实施例2
原料铁水经过铁水深度脱硫,转炉顶底吹炼,钢包吹氩,LF精炼、RH真空处理以及连铸工艺,得到表3的化学成分,板坯厚度为250mm,板坯均热段温度1235℃,加热时间200min,均热时间43min,第一阶段开轧温度1100℃,第二阶段开轧温度860℃,中间坯的厚度为88mm, 轧件厚度40mm,终轧温度811℃,轧后采用堆冷方式冷却,堆冷时间≥24小时,获得钢板力学性能检验结果见表4。
Claims (1)
1.一种造纸辊用Q235B-T钢板的生产方法,其特征在于:通过成分设计,控制轧制工艺技术获得高质量的造纸辊母材钢板;
1)、钢板的化学成分按质量百分比含量为C:0.15~0.18%; Mn:0.70~0.80%;Si: 0.15~0.25%,S ≤0.010%, P≤0.018%,Als 0.020~0.040%,Ti:0.01~0.02%,其余为Fe和不可避免杂质元素;
2)、造纸辊材料的生产方法:转炉冶炼→LF精炼→真空冶炼→连铸→加热→轧制→缓冷;
炼钢工序:转炉采用脱磷钢水 P≤0.018%,LF脱硫钢水S ≤0.010%,真空处理脱除H、N有害元素,H≤0.0004%,N≤0.0060%,在连铸设备得到厚度250mm连铸坯;
3)、加热工序:厚度250mm板,坯在步进式加热炉加热,一加段温度工艺要求1100±50℃,二加段温度工艺要求1245±25℃,均热段温度工艺要求1225±25℃,总在炉时间≥200min,均热时间≥42min;
4)、轧制工序:采用两阶段控制轧制控制,粗轧的开轧温度为1070-1120℃,粗轧阶段的单道次压下率≥20%,精轧阶段的开轧温度≤950℃,中间坯待温厚度为成品厚度的2.2~4倍,精轧阶段的道次压下率为15%~18%以上,控轧的总压下率大于50%, 终轧温度780-850℃;
5)、缓冷工序:厚度≥20mm Q235B-T 钢板表面温度≥400℃下线堆垛缓冷,缓冷时间≥24小时。
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WO2007079625A1 (fr) * | 2006-01-06 | 2007-07-19 | Angang Steel Company Limited | Tole d'acier a grain ultrafin obtenue par coulee continue et laminage d'une brame semi fine, et son procede de fabrication |
CN103509925A (zh) * | 2013-09-29 | 2014-01-15 | 南京钢铁股份有限公司 | 一种提升q345r钢板探伤合格率的低成本生产工艺 |
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CN114032468A (zh) * | 2021-11-18 | 2022-02-11 | 新疆八一钢铁股份有限公司 | 一种低成本q345e结构钢板的生产方法 |
CN114540580A (zh) * | 2022-03-11 | 2022-05-27 | 新疆八一钢铁股份有限公司 | 一种低成本Q345q系列桥梁钢板的生产方法 |
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Patent Citations (6)
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CN1614067A (zh) * | 2004-09-23 | 2005-05-11 | 攀钢集团攀枝花钢铁研究院 | 厚规格超细晶粒热轧钢板及其生产工艺 |
WO2007079625A1 (fr) * | 2006-01-06 | 2007-07-19 | Angang Steel Company Limited | Tole d'acier a grain ultrafin obtenue par coulee continue et laminage d'une brame semi fine, et son procede de fabrication |
CN103509925A (zh) * | 2013-09-29 | 2014-01-15 | 南京钢铁股份有限公司 | 一种提升q345r钢板探伤合格率的低成本生产工艺 |
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CN114032468A (zh) * | 2021-11-18 | 2022-02-11 | 新疆八一钢铁股份有限公司 | 一种低成本q345e结构钢板的生产方法 |
CN114540580A (zh) * | 2022-03-11 | 2022-05-27 | 新疆八一钢铁股份有限公司 | 一种低成本Q345q系列桥梁钢板的生产方法 |
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