CN113462968B - 一种节镍型奥氏体不锈钢制造工艺 - Google Patents
一种节镍型奥氏体不锈钢制造工艺 Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 5
- 239000010903 husk Substances 0.000 claims description 5
- 235000009566 rice Nutrition 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 230000001914 calming effect Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 13
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011733 molybdenum Substances 0.000 abstract description 4
- 239000011651 chromium Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 239000010949 copper Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 241000209094 Oryza Species 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
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- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
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- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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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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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/40—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
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- 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
- B21B2001/225—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 by hot-rolling
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- 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
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Abstract
本发明公开了一种节镍型奥氏体不锈钢制造工艺,按重量百分比其化学成分包括:C≤0.15%、Si≤0.5%、Mn≤8.5%、P≤0.05%、S≤0.003%、Cr≤13%、Ni≤0.8%、N≤0.15%、Cu≤0.25%、B≤0.0025%、Mo≤13%,余量为Fe和少量不可避免的杂质,一种节镍型奥氏体不锈钢制造工艺包括AOD炉熔炼、LF炉精炼、连铸、热轧加热、粗轧、精轧、卷取,本发明提高解决奥氏体不锈钢加工性能的同时进一步优化控制镍含量,在奥氏体不锈钢中增加钼元素,使各化学元素配比更加合理,使奥氏体不锈钢能够展示出较为优良的耐孔蚀性。
Description
技术领域
本发明属于奥氏体不锈钢加工技术领域,特别涉及一种节镍型奥氏体不锈钢制造工艺。
背景技术
在现有的节镍型奥氏体不锈钢中,不锈钢生产企业也在积极开发节镍型奥氏体不锈钢,但大部分节镍型不锈钢在节镍的同时添加了较高含量的铜元素,造成的热加工性能恶化,以出现边裂等缺陷,影响成材率,且由于钢水纯净度不够及夹杂物较多,在装饰等使用过程中表面缺陷较多,影响客户使用;还有为了强化耐腐蚀性,通过高铬含量和氮来提高奥氏体不锈钢的耐腐蚀性,但在特定环境中,例如在氯化物的环境当中,其耐孔蚀性会有明显的下降。
发明内容
本发明的目的是克服现有技术中不足,提供一种节镍型奥氏体不锈钢制造工艺,解决奥氏体不锈钢加工性能的同时进一步优化控制镍含量,在奥氏体不锈钢中增加钼元素,使各化学元素配比更加合理,使奥氏体不锈钢能够展示出较为优良的耐孔蚀性。
为了实现上述目的,本发明采用的技术方案是:
一种节镍型奥氏体不锈钢制造工艺,按重量百分比其化学成分包括:C≤0.15%、Si≤0.5%、Mn≤8.5%、P≤0.05%、S≤0.003%、Cr≤13%、Ni≤0.8%、N≤0.15%、Cu≤0.05%、B≤0.0025%、Mo≤13%,余量为Fe和少量不可避免的杂质;
节镍型奥氏体不锈钢的制造工艺,包括以下步骤:
步骤1、AOD炉熔炼:各化学元素按重量百分比依次加入C≤0.1%、0.3%≤Si≤0.5%、7.0%≤Mn≤9%、Cr≤13.5%、Ni≤0.8%、N≤0.15%、Mo≤13%,其余为低磷废钢铁水与高碳锰铁铁水,出钢温度1600~1650℃;
步骤2、LF炉精炼:进站时间≥60min/炉,强吹时间≥12min,弱吹时间≥15min,镇静时间≥15min,出钢温度1550~1600℃;
步骤3、连铸,钢水不断地通过水冷结晶器,凝成硬壳后从结晶器下方出口连续拉出,经喷水冷却,全部凝固后切成坯料;
步骤4、热轧加热:板坯厚度180mm~220mm,入炉温度520~560℃,预热段温度750℃~900℃,加热时间20min~30min,预热段结束进入一加热段,一加热段温度1010℃~1050℃,时间控制在45min~55min,一加热段结束进入二加热段,二加热段温度1165℃~1185℃,时间控制在55min~65min,二加热段结束进入均热段,均热段温度1285℃~1295℃,时间控制在40min~50min,炉内加热总时间控制在160min~200min;
步骤5、粗轧:采用5道次轧制,首道次压下率控制在27.1%~29.5%,二道次压下率控制在32.1%~35.3%,三道次压下率控制在36.5%~38.4%,四道次压下率控制在32.3%~33.1%,五道次压下率控制在22.3%~23.7%,第一、三道次除鳞,除鳞速度0.8m/s-1.8m/s;
步骤6、精轧:精轧投用水同时使用蒸汽除鳞,精轧入口温度1020~1120℃,精轧出口温度>980℃,采用8架精轧机道次压下率分别为F1:40.1%~42.1%、F2:38.1%~39.2%、F3:35.1%~37.1%、F4:30.1%~33.4%、F5:25.2%~28.5%、F6:21.4%~22.3%、F7:19.1%~20.8%、F8:15.2%~18.1%;
步骤7、卷取:投用层流冷却,卷取温度>680℃,黑皮卷成卷后立即堆垛缓冷,温度<100℃方可进行开卷测厚、取样。
优选的,步骤3、连铸:目标温度对应目标拉速:定尺为三尺,中包温度1468℃~1479℃,对应拉速1.20~1.25m/min,定尺为四尺,中包温度1468℃~1479℃,对应拉速1.20~1.25m/min,定尺为五尺,中包温度1468℃~1479℃,对应拉速为1.05~1.10m/min,结晶器保护渣使用量控制在0.4~0.5kg/吨钢,中包覆盖剂为碳化稻壳。
本发明与现有技术相比较有益效果表现在:
1)本发明将奥氏体不锈钢中镍含量进一步控制优化,降低不锈钢中的镍含量,使生产成本能够进一步降低,同时保证奥氏体不锈钢的生产稳定性,同时通过在精轧的过程中,提高入口温度,黑皮成卷后堆垛缓冷,提高后续奥氏体不锈钢的加工性能。
2)通过增加奥氏体不锈钢中的钼元素,形成含有铬、氮、钼的奥氏体不锈钢,扩大使用范围,耐腐蚀性进一步加强,即使在腐蚀性较强的环境中,也能够展示出较为优良的耐孔蚀性以及耐间隙腐蚀性。
具体实施方式
为方便本技术领域人员的理解,下面结合实施例1~3,对本发明的技术方案进一步具体说明。
实施例1:
按重量百分比其化学成分包括:C=0.15%、Si=0.5%、Mn=8.5%、P=0.05%、S=0.003%、Cr=13%、Ni=0.8%、N=0.15%、Cu=0.05%、B=0.0025%、Mo=13%,余量为Fe和少量不可避免的杂质;
节镍型奥氏体不锈钢的制造工艺,包括以下步骤:
步骤1、AOD炉熔炼:各化学元素按重量百分比依次加入C=0.1%、Si=0.5%、Mn=9%、Cr=13.5%、Ni=0.8%、N=0.15%、Mo=13%,其余为低磷废钢铁水与高碳锰铁铁水,出钢温度1600~1650℃;
步骤2、LF炉精炼:进站时间≥60min/炉,强吹时间≥12min,弱吹时间≥15min,镇静时间≥15min,出钢温度1550~1600℃;
步骤3、连铸,钢水不断地通过水冷结晶器,凝成硬壳后从结晶器下方出口连续拉出,经喷水冷却,全部凝固后切成坯料;
步骤4、热轧加热:板坯厚度180mm~220mm,入炉温度520~560℃,预热段温度750℃~900℃,加热时间20min,预热段结束进入一加热段,一加热段温度1010℃~1050℃,时间控制在45min,一加热段结束进入二加热段,二加热段温度1165℃~1185℃,时间控制在55min,二加热段结束进入均热段,均热段温度1285℃~1295℃,时间控制在40min,炉内加热总时间控制在160min;
步骤5、粗轧:采用5道次轧制,首道次压下率控制在27.1%,二道次压下率控制在32.1%,三道次压下率控制在36.5%,四道次压下率控制在32.3%,五道次压下率控制在22.3%,第一、三道次除鳞,除鳞速度1.5m/s;
步骤6、精轧:精轧投用水同时使用蒸汽除鳞,精轧入口温度1020~1120℃,精轧出口温度>980℃,采用8架精轧机道次压下率分别为F1:40.1%、F2:38.1%、F3:35.1%、F4:30.1%、F5:25.2%、F6:21.4%、F7:19.1%、F8:15.2%;
步骤7、卷取:投用层流冷却,卷取温度>680℃,黑皮卷成卷后立即堆垛缓冷,温度<100℃方可进行开卷测厚、取样。
其中,步骤3连铸:目标温度对应目标拉速如下表:
定尺 | 中包温度℃ | 对应拉速/m/min |
三尺 | 1470 | 1.21 |
四尺 | 1470 | 1.21 |
五尺 | 1475 | 1.05 |
中包覆盖剂及结晶器保护渣,保护渣使用量控制在0.4kg/吨钢:
中包覆盖剂 | 结晶器保护渣 |
碳化稻壳 | LY~200 |
实施例2:
与实施例1相比所不同的是:
步骤4、热轧加热:板坯厚度180mm~220mm,入炉温度520~560℃,预热段温度750℃~900℃,加热时间25min,预热段结束进入一加热段,一加热段温度1010℃~1050℃,时间控制在50min,一加热段结束进入二加热段,二加热段温度1165℃~1185℃,时间控制在60min,二加热段结束进入均热段,均热段温度1285℃~1295℃,时间控制在45min,炉内加热总时间控制在180min;
步骤5、粗轧:采用5道次轧制,首道次压下率控制在28.5%,二道次压下率控制在34.3%,三道次压下率控制在37.4%,四道次压下率控制在33.1%,五道次压下率控制在23.7%,第一、三道次除鳞,除鳞速度1.3m/s;
步骤6、精轧:精轧投用水同时使用蒸汽除鳞,精轧入口温度1020~1120℃,精轧出口温度>980℃,采用8架精轧机道次压下率分别为F1:41.1%、F2:38.5%、F3:36.1%、F4:32.4%、F5:27.5%、F6:22.3%、F7:19.5%、F8:17.1%。
其中,步骤3连铸:标温度对应目标拉速如下表:
定尺 | 中包温度℃ | 对应拉速/m/min |
三尺 | 1475 | 1.22 |
四尺 | 1476 | 1.22 |
五尺 | 1478 | 1.08 |
中包覆盖剂及结晶器保护渣:
保护渣使用量控制在0.45kg/吨钢
中包覆盖剂 | 结晶器保护渣 |
碳化稻壳 | ST~SP200 |
实施例3:
与实施例1相比所不同的是:
步骤4、热轧加热:板坯厚度180mm~220mm,入炉温度520~560℃,预热段温度750℃~900℃,加热时间25min,预热段结束进入一加热段,一加热段温度1010℃~1050℃,时间控制在55min,一加热段结束进入二加热段,二加热段温度1165℃~1185℃,时间控制在60min,二加热段结束进入均热段,均热段温度1285℃~1295℃,时间控制在50min,炉内加热总时间控制在190min;
步骤5、粗轧:采用5道次轧制,首道次压下率控制在29.5%,二道次压下率控制在35.3%,三道次压下率控制在38.4%,四道次压下率控制在33.1%,五道次压下率控制在23.7%,第一、三道次除鳞,除鳞速度1.6m/s;
步骤6、精轧:精轧投用水同时使用蒸汽除鳞,精轧入口温度1020~1120℃,精轧出口温度>980℃,采用8架精轧机道次压下率分别为F1:42.1%、F2:39.2%、F3:37.1%、F4:33.4%、F5:28.5%、F6:22.3%、F7:20.8%、F8:18.1%。
其中,步骤3连铸:目标温度对应目标拉速如下表:
定尺 | 中包温度℃ | 对应拉速/m/min |
三尺 | 1478 | 1.25 |
四尺 | 1478 | 1.22 |
五尺 | 1468 | 1.05 |
中包覆盖剂及结晶器保护渣:
保护渣使用量控制在0.5kg/吨钢
中包覆盖剂 | 结晶器保护渣 |
碳化稻壳 | ST~SP200 |
对比例1:
CN102943220B,一种节镍型奥氏体不锈钢及其制造方法,其成分按重量百分比为:C<0.10%、Si≤1.00%、9.0%≤Mn≤12.0%、S≤0.045%、P≤0.060%、1.0%≤Ni≤3.0%、13.0%≤Cr≤16.0%、0.1%≤Cu≤1.0%、N≤0.2%、B≤30×10~4%、20×10~4%≤Ca≤60×10~4%,余量为Fe。
对比例2:
与实施例1不同的是:一种节镍型奥氏体不锈钢,其化学成分不包含钼元素,其化学元素按重量百分比为:C=0.13%、Si=0.45%、Mn=8.7%、P=0.05%、S=0.003%、Cr=9.7%、Ni=0.6%、N=0.14%、Cu=0.25%、B=0.0025%。
试验例:
板坯厚度200mm钢坯轧制成钢卷,分别将四种实施方式制得的不锈钢带钢进行取样,分别置于潮湿环境与含有氯化物的环境中,进行表面观察,以下是样品观察记录表:
综上所述,本发明通过增加奥氏体不锈钢中的钼元素,形成含有铬、氮、钼的奥氏体不锈钢,可使奥氏体不锈钢的耐腐蚀性进一步加强,即使在腐蚀性较强的环境中,也能够展示出较为优良的耐孔蚀性以及耐间隙腐蚀性。
以上内容仅仅是对本发明的结构所作的举例和说明,所属本技术领域的技术人员对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代,只要不偏离发明的结构或者超越本权利要求书所定义的范围,均应属于本发明的保护范围。
Claims (5)
1.一种节镍型奥氏体不锈钢制造工艺,其特征在于按重量百分比其化学成分包括:C≤0.15%、Si≤0.5%、Mn≤8.5%、P≤0.05%、S≤0.003%、Cr≤13%、Ni≤0.8%、N≤0.15%、Cu≤0.05%、B≤0.0025%、Mo≤13%,余量为Fe和少量不可避免的杂质;
节镍型奥氏体不锈钢的制造工艺,包括以下步骤:
步骤1、AOD炉熔炼:出钢温度1600~1650℃;
步骤2、LF炉精炼:出钢温度1550~1600℃;
步骤3、连铸,钢水不断地通过水冷结晶器,凝成硬壳后从结晶器下方出口连续拉出,经喷水冷却,全部凝固后切成坯料;
步骤4、热轧加热:板坯厚度180mm~220mm,入炉温度520~560℃,预热段温度750℃~900℃,加热时间20min~30min,预热段结束进入一加热段,一加热段温度1010℃~1050℃,时间控制在45min~55min,一加热段结束进入二加热段,二加热段温度1165℃~1185℃,时间控制在55min~65min,二加热段结束进入均热段,均热段温度1285℃~1295℃,时间控制在40min~50min,炉内加热总时间控制在160min~200min;
步骤5、粗轧:采用5道次轧制,首道次压下率控制在27.1%~29.5%,二道次压下率控制在32.1%~35.3%,三道次压下率控制在36.5%~38.4%,四道次压下率控制在32.3%~33.1%,五道次压下率控制在22.3%~23.7%,第一、三道次除鳞,除鳞速度0.8m/s-1.8m/s;
步骤6、精轧:精轧投用水同时使用蒸汽除鳞,采用8架精轧机道次压下率分别为F1:40.1%~42.1%、F2:38.1%~39.2%、F3:35.1%~37.1%、F4:30.1%~33.4%、F5:25.2%~28.5%、F6:21.4%~22.3%、F7:19.1%~20.8%、F8:15.2%~18.1%;
步骤7、卷取:投用层流冷却,卷取温度>680℃,黑皮卷成卷后立即堆垛缓冷,温度<100℃方可进行开卷测厚、取样。
2.根据权利要求1所述的一种节镍型奥氏体不锈钢制造工艺,其特征在于步骤1、AOD炉熔炼:各化学元素按重量百分比依次加入C≤0.1%、0.3%≤Si≤0.5%、7.0%≤Mn≤9%、Cr≤13.5%、Ni≤0.8%、N≤0.15%、Mo≤13%,其余为低磷废钢铁水与高碳锰铁铁水。
3.根据权利要求1所述的一种节镍型奥氏体不锈钢制造工艺,其特征在于步骤2、LF炉精炼:进站时间≥60min/炉,强吹时间≥12min,弱吹时间≥15min,镇静时间≥15min。
4.根据权利要求1所述的一种节镍型奥氏体不锈钢制造工艺,其特征在于步骤3、连铸:目标温度对应目标拉速:定尺为三尺,中包温度1468℃~1479℃,对应拉速1.20~1.25m/min,定尺为四尺,中包温度1468℃~1479℃,对应拉速1.20~1.25m/min,定尺为五尺,中包温度1468℃~1479℃,对应拉速为1.05~1.10m/min,结晶器保护渣使用量控制在0.4~0.5kg/吨钢,中包覆盖剂为碳化稻壳。
5.根据权利要求1所述的一种节镍型奥氏体不锈钢制造工艺,其特征在于步骤6、精轧:精轧入口温度1020~1120℃,精轧出口温度>980℃。
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