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 通过对不同厚度、不同抗拉强度的奥氏体不锈钢304箔材进行多种标距的拉伸试验，利用伸长率与比例系数进行回归拟合的方式，分析了影响304箔材n]值的主要因素，总结了Olive公式在固溶态和冷变形304箔材中的应用规律，拓宽了Olive伸长率换算公式的应用范围。结果表明：试样适宜的L0]取值范围为20～90 mm，试样厚度（宽厚比）与n] 值间无明显的相关性。另外对于Rm]≥750 MPa的冷变形304箔材，n]值与抗拉强度间呈正相关。同时分3个抗拉强度范围给出了n]值的预测值，当Rm]≤750 MPa时，n]＝0.130，与标准规定值完全吻合；760 MPa≤Rm]≤960 MPa时，n]＝0.160；1 050 MPa≤Rm]≤1 270 MPa时，n]＝0.378。

Discussion on the application of Olive elongation conversion expression in austenitic stainless steel 304 foil

Tensile tests were performed on austenitic stainless steel 304 foil samples with different thickness and multiple gauge length. Testing sheets were taken at solution and cold-forming states and with variant tensile strength. Using regression analysis on percentage elongation and ratio coefficient, the main influential factors on n] value of 304 foil were investigated and the application rule of Olive formula was summarized and its application range was developed. The results show the proper range of L0] is from 20 mm to 90 mm and the specimen thickness (flakiness ratio) has no clear correlation with n] value. In addition as the tensile strength of 304 cold-forming foil is greater than or equal to 750 MPa, the n] value has positive correlation with it. Meanwhile the predicted values of n] are presented according to the strength extent, i.e. When the tensile strength Rm] is less than or equal to 750 MPa, the n] value is 0.130 and completely consistent with specified value in the standard; As Rm] changes between 760 MPa and 960 MPa, the n] value is 0.160; While Rm] is within the range of 1 050-1 270 MPa, the n] value is 0.378.