本发明公开了一种确定管线钢DWTT 减薄试样试验温度的方法，属于力学性能测试领域。本发明的方法，包括以下：1）取X70 或X80 管线钢，得到不同温度下的剪切面积百分数；拟合，得到SA%-T，得到FATT85%；2）减薄试样，得到一系列壁厚的试样，得到相应壁厚下温度与剪切面积百分数的对应值；将数据分别进行拟合，得到一系列试样的SA%-T 拟合曲线；根据SA%-T 拟合曲线，得到不同试样的FATT85%；3）将1）和2）中任意两个试样的壁厚和FATT85%求差，得到壁厚减薄量和温度降低量，将两个量进行回归，得到拟合曲线；4）进行试样测试时，根据试样壁厚减薄量和3）的曲线获取相应的温度降低量。

The invention discloses a method for determining the test temperature of pipeline steel DWTT thinning sample, belonging to the field of mechanical property test. The method of the invention comprises the following steps: Taking X70 or X80 pipeline steel to obtain the percentage of shear area at different temperatures; Fitting, SA% -T, FATT85%; Thin the sample to obtain a series of samples with wall thickness, and obtain the corresponding value of temperature and shear area percentage under the corresponding wall thickness; The data were fitted separately to obtain the SA% - T fitting curves of a series of samples; According to SA% - T fitting curve, fatt85% of different samples are obtained; Calculate the difference between the wall thickness and FATT85% of any two samples in 1) and 2) to obtain the wall thickness reduction and temperature reduction, and regress the two quantities to obtain the fitting curve; When testing the sample, obtain the corresponding temperature reduction according to the wall thickness reduction of the sample and the curve of 3).