摘要：940X不銹軸承鋼是由上海材料研究所開發的具有高硬度、耐海水腐蝕的一種新型不銹軸承鋼。940X不銹軸承鋼經熱處理后，室溫硬度HRC 56~58；屈服1410MPa, 抗拉1820MPa。在450℃和500℃高溫時，顯微硬度HV₅分別為504和471，相應的洛氏硬度HRC分別為49.5和47.2 , 940X不銹軸承鋼在高溫條件下也具有高的硬度。在模擬海水的NaCl溶液中的腐蝕試驗表明，940X不銹軸承鋼具有良好的耐海水腐蝕的能力。在35℃的5%NaCl溶液進行鹽霧試驗，940X不銹軸承鋼加工的軸承，經120h鹽霧試驗后無銹蝕；而對比材料9Cr18加工的軸承24h鹽霧試驗出現銹蝕。30℃的3.5%NaCl溶液中940X不銹軸承鋼點蝕電位+30mV/SCE，遠高于9Cr18不銹軸承鋼-230 mV/SCE。并結合化學成分及金相能譜分析研究了940X不銹軸承鋼的高硬度、耐海水腐蝕機理。

關鍵詞：940X不銹軸承鋼，耐海水腐蝕、高硬度

中圖分類號：TG174.2   文獻標識碼：A       DOI：10.6052/0459-1879-12-345
 
 

Abstract: A new stainless bearing steel 940X with high hardness and good corrosion resistance of seawater, is developed by Shanghai Research Institute of Materials. Stainless steel 940X had high hardness of 56~58 HRC, high yield strength of 1410 MPa and tensile strength of 1820 MPa at room temperature. The hardness of Steel 940X at 450℃ and 500℃ was 49.5 HRC and 47.1 HRC, which related to high temperature vickers microhardness 504 HV and 407 HV, respectively. So Steel 940X had high hardness at high temperatures. Results of corrosion tests in NaCl solutions showed that Steel 940X had good corrosion resistance of seawater. Results of spraying salt test in 5% NaCl solution at 35℃ showed that surface of steel 940X was not corroded after testing for 120 hours while surface of steel 9Cr18 was corroded after testing for 24 hours only. The pitting potential of Steel 940X was +30mV/SCE which being higher much than that -230 mV/SCE of Steel 9Cr18 in 3.5% NaCl solution at 30℃. Mechanism of high hardness and good corrosion resistance of seawater of Steel 940X was investigated by means of chemical composition, micrograph and EDS.
Key Words: Stainless bearing Steel 940X, good corrosion resistance of seawater, high hardness.