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轴承钢国内需求速增,新技术需同步
发布日期:2024-02-07

十二五期间国内需求增速10%以上,2011年预计350万吨左右。未来重点看好风电轴承用钢、高铁轴承用钢、大飞机轴承用钢三大领域。国内行业集中度较高,宝特、东特、中信泰富、锡钢集团、郑州永通占国内80%以上的份额。

为适应高温、高速、高负荷、耐蚀、抗辐射的要求,需要研制一系列具有特殊性能的新型轴承钢。为了降低轴承钢的氧含量,发展了真空冶炼、电渣重熔、电子束重熔等轴承钢的冶炼技术。而大批量轴承钢的冶炼由电弧炉熔炼,发展成各种类型初炼炉加炉外精炼。目前,采用容量大于60吨初炼炉+LFVDRH+连铸+连轧工艺生产轴承钢,以达到高质量、高效率、低能耗之目的。在热处理工艺方面,由车底式炉、罩式炉发展成连续可控气氛退火炉热处理。目前,连续热处理炉型最长为150m,加工生产轴承钢的球化组织稳定和均匀,脱碳层小,消耗能量低。

20世纪70年代以来,随着经济发展和工业技术进步,轴承的应用范围扩大;而国际贸易的发展,又推动了轴承钢标准国际化和新技术、新工艺及新装备的开发和应用,效率高、质量高、成本低的配套技术和工艺装备应运而生。日本和德国等均建成了高洁净度、高质量的轴承钢生产线,使钢的产量迅速增加,钢的质量和疲劳寿命大度提高。日本和瑞典生产的轴承钢的含量降到10ppm以下。80年代末期,日本山阳特钢公司的先进水平为5.4ppm,达到了真空重熔轴承钢的水平。

针对GCr15SiMn钢淬透性低的弱点,我国开发了高淬透性和淬硬性轴承钢GCr15SiMo,其淬硬性HRC≥60,淬透性J60≥25mmGCr15SiMo的接触疲劳寿命L10L50分别比GCr15SiMn提高73%和68%,在相同使用条件下,用G015SiMo钢制造的轴承的使用寿命是GCr15SiMo钢的两倍。近年来,我国还开发了能节约能源、节约资源和抗冲击的GCr4轴承钢。与GCr15相比,GCr4的冲击值提高了66%~104%,断裂韧性提高了67%,接触疲劳寿命L10提高了12%。GCr4钢轴承采用高温加热表面淬火热处理工艺。与全淬透的GCr15钢轴承相比,GCr4钢轴承的寿命明显提高,可用于重载高速列车轴承。

今后轴承钢主要向高洁净度和性能多样化两个方向发展。提高轴承钢的洁净度,特别是降低钢中的氧含量,可以明显延长轴承的寿命。氧含量由28ppm降低到5ppm,劳寿命可以延长1个数量级。为了延长轴承的寿命,人们多年来一直致力于开发应用精炼技术来降低钢中的氧含量。通过不懈的努力,轴承钢中的最低氧含量已从20世纪60年代的28ppm降低到90年代的5ppm。目前,我国可以将轴承钢中的最低氧含量控制在10ppm左右。轴承使用环境的变化要求轴承钢必须具备性能的多样化。如设备转速的提高,需要准高温用(200以下)轴承钢(通常采用在SUJ2钢的基础上提高Si含量、添加VNb的方法来达到抗软化和稳定尺寸的目的);腐蚀应用场合,需要开发不锈轴承钢;为了简化工艺,应该开发高频淬火轴承钢和短时渗碳轴承钢;为了满足航空航天的需要,应开发高温轴承钢。

基本 文件 流程 错误 SQL 调试
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  13. SELECT `id`,`catid`,`title`,`thumb` FROM `zzw_news` WHERE `id` < 5098 AND `deltime` = '' AND `catid` = 108 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000556s ]
  14. SELECT `id`,`catid`,`title`,`thumb`,`addtime`,`fbtime` FROM `zzw_news` WHERE `deltime` = '' AND `is_recommend` = 1 ORDER BY `id` DESC LIMIT 0,4 [ RunTime:0.004079s ]
  15. SELECT `id`,`catid`,`title`,`thumb`,`addtime`,`fbtime` FROM `zzw_news` WHERE `deltime` = '' AND `is_recommend` = 0 ORDER BY `id` DESC LIMIT 0,10 [ RunTime:0.000542s ]
  16. SHOW FULL COLUMNS FROM `zzw_news_cat` [ RunTime:0.001628s ]
  17. SELECT * FROM `zzw_news_cat` WHERE `parent_id` = 0 AND `deltime` = '' [ RunTime:0.000390s ]
  18. SELECT COUNT(*) AS think_count FROM `zzw_news` WHERE `deltime` = '' AND `catid` = 84 [ RunTime:0.026213s ]
  19. SELECT `id`,`catid`,`title`,`thumb`,`addtime`,`fbtime` FROM `zzw_news` WHERE `deltime` = '' AND `catid` = 84 ORDER BY `id` DESC [ RunTime:0.031518s ]
  20. SELECT COUNT(*) AS think_count FROM `zzw_news` WHERE `deltime` = '' AND `catid` = 85 [ RunTime:0.006733s ]
  21. SELECT `id`,`catid`,`title`,`thumb`,`addtime`,`fbtime` FROM `zzw_news` WHERE `deltime` = '' AND `catid` = 85 ORDER BY `id` DESC [ RunTime:0.007155s ]
  22. SELECT * FROM `zzw_config` WHERE `id` = 2 LIMIT 1 [ RunTime:0.000645s ]
0.125602s