It usually stands for minimum design metal temperature.
MDMT is the acronym for Minimum Design Metal Temperature. It is one of the conditions of design for pressure vessels and machines that create metal designs.
The minimum design metal temperature (MDMT) of Grade 350W steel typically ranges from -30°C to -40°C, depending on the specific application and the manufacturer's specifications. This grade of steel is commonly used in structural applications and is designed to withstand low-temperature environments. It's important to consult relevant design codes and standards for precise MDMT values in specific conditions.
MDMT usually is used for decision of metal thickness. this is the most important to design such as a drum , tank, etc.. in plant business.