一、序论钢铁一般都会随着温度的降低而减少延性、渐趋脆化。这样,钢材在低温下使用就受到了限制。在此情况下,问题在于以下两个方面:一是如何确定钢材所要求的韧性特性值,以使其与设计应力和最低使用温度相适应;二是在使用温度下,怎样生产出韧性 First, preface Steel generally decreases ductility as the temperature decreases, becoming increasingly brittle. In this way, the use of steel at low temperatures is limited. In this case, the problem lies in the following two aspects: First, how to determine the required toughness properties of steel values ​​to make it with the design stress and the minimum temperature to adapt; Second, at the use of temperature, how to produce toughness