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基于非鋁脫氧工藝的高品質軸承鋼關鍵冶金技術研究

Key metallurgical technology for high-quality bearing steel production based on the nonaluminum deoxidation process

  • 摘要: 我國高品質軸承鋼生產技術已取得了長足進步,部分企業的軸承鋼質量處于世界先進水平,但質量穩定性與世界領先水平仍存在一定差距。目前,國內外主要采用鋁脫氧工藝生產軸承鋼,通過鋁脫氧和造高堿度渣快速降低鋼液中氧含量,高品質軸承鋼中全氧質量分數已經可以控制在5×10?6以下,但仍存在大顆粒球狀(Ds類)類夾雜物導致疲勞失效的難題,以及超低全氧和鈦含量難以穩定控制、小方坯連鑄水口堵塞等問題。針對上述問題,本研究提出了非鋁脫氧工藝生產軸承鋼,即在轉爐出鋼時加入硅錳合金預脫氧,鋼包精煉爐(LF)向渣面加入硅質脫氧劑擴散脫氧,真空循環脫氣精煉(RH)真空深脫氧,保證鋼液全氧質量分數在8×10?6左右。在保證鋼液低鋁低鈦的同時,利用低堿度渣改變夾雜物類型,控制夾雜物塑性化,從而有效地解決鋼液流動性問題。利用超聲疲勞試驗機對兩種工藝軸承鋼疲勞壽命進行測定,闡明了不同類型夾雜物對疲勞性能的影響,剖析了不同工藝軸承鋼的疲勞斷裂機理,研究了引起疲勞裂紋的夾雜物臨界尺寸。

     

    Abstract: Bearing steel is subjected to complex alternating stress conditions for a long time which requires excellent service properties such as high hardness, high wear resistance, high elastic limit, and high contact fatigue strength. Therefore, during bearing steel production, it is necessary to strictly control the process and improve the purity of steel to ensure high precision, long service life, and high reliability of bearings. China has made considerable progress in the production technology of high-quality bearing steel, and some enterprises can produce world-class bearing steel. However, the stability of bearing steel still requires improvement. Currently, the aluminum deoxidation process is mainly used to produce bearing steel at home and abroad. Through aluminum deoxidation and the production of high-alkalinity slag, the oxygen content in liquid steel can be rapidly reduced. The total oxygen mass fraction in high-quality bearing steel can be controlled below 5×10?6. However, fatigue failure caused by occasional Ds-type inclusions still occurs. Concurrently, other problems such as blockage of small billet continuous casting nozzle and difficulty in stable control of ultralow total oxygen and titanium content also occur. To circumvent the aforementioned problems, this study proposed a nonaluminum deoxidation process by adding silicon–manganese alloy for pre-deoxidation during converter tapping, adding silicon deoxidizer to the ladle furnace (LF) slag surface for diffusion deoxidation, and Ruhrstahl?Heraeus (RH) vacuum deep deoxidation to ensure that the total oxygen mass fraction of the molten steel was approximately 8×10?6, to produce bearing steel. While ensuring the low aluminum and low titanium contents of liquid steel, low-alkalinity slag is used to change the type of inclusions and control the plasticity of inclusions to effectively solve the problem of liquid steel fluidity. The fatigue life of bearing steels by two kinds of processes was evaluated using the ultrasonic fatigue testing machine, the effects of different types of inclusions on fatigue performance were verified, the fatigue fracture mechanism of bearing steels by different processes was analyzed, and the critical size of inclusions causing fatigue cracks was predicted. The application of the aforementioned key technologies plays a guiding role in the large-scale production of nonaluminum deoxidized high-quality bearing steel. However, its quality still lags behind the most advanced production level of bearing steel worldwide, including the poor desulfurization effect caused by the use of low-basicity slag in the refining process, which needs to be further investigated.

     

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