ISO 9328-5:2011规定了压力设备用扁平产品的要求，扁平产品由热机械轧制可焊接细晶粒钢制成。这些钢不适合热成型。 到目前为止，还没有足够的数据来标准化这些钢的高温性能。如果打算在这样的温度下使用，相关方应特别约定使用条件。 ISO 9328的要求和定义- 1:2011也适用于ISO 9328-5:2011。

ISO 9328-5:2011 specifies the requirements for flat products for pressure equipment, made of thermomechanically rolled weldable fine grain steels. The steels are not suitable for hot forming. Until now, no sufficient data for the standardization of the elevated temperature properties of these steels are available. If their use at such temperatures is intended, the conditions for this are specially agreed upon between the interested parties. The requirements and definitions of ISO 9328-1:2011 also apply to ISO 9328-5:2011.