In a concentrated sulfuric acid medium, the storage tank material can be 16MnDR

16MnDR is a low-alloy steel primarily used in important facilities such as pressure vessels and boilers. It possesses good mechanical and processability properties, but its corrosion resistance to highly corrosive media such as concentrated sulfuric acid is generally not satisfactory. Concentrated sulfuric acid exhibits varying degrees of corrosivity toward materials at different temperatures. Generally, low-carbon steel or ordinary carbon steel suffers severe corrosion in an environment with high-concentration sulfuric acid, even at room temperature. For 98% concentrated sulfuric acid, the commonly used materials for storage tanks are acid-resistant stainless steels (such as 304, 316 stainless steel, etc.), or steel with special corrosion-resistant coatings, such as those lined with lead, PTFE (polytetrafluoroethylene), or other special plastics or rubbers. These materials and coatings can provide better corrosion resistance, enabling them to withstand the attack of concentrated sulfuric acid. As a steel used for pressure vessels, 16MnDR is not suitable for storing 98% concentrated sulfuric acid without special corrosion protection. Under normal circumstances, containers used for storing concentrated sulfuric acid must meet certain corrosion resistance requirements, and at the design temperature of -25°C, the impact toughness of the material is also a factor that needs to be taken into account. When designing storage tanks, it is necessary to first refer to relevant standards and specifications for the chemical industry, pressure vessels, and corrosion protection. At the same time, taking into account the specific operating environment, thorough safety considerations, as well as potential extreme conditions (such as temperature fluctuations and concentration changes), an appropriate material for the tank should be selected. Therefore, in most cases, for 98% concentrated sulfuric acid, 16MnDR is not a suitable choice; a more corrosion-resistant material is required. Before selecting materials, it is recommended to consult experienced chemical engineers or material scientists in detail to ensure safety and economic efficiency. .

Carbon steel can be used as a storage tank for 98% concentrated sulfuric acid.

Is 16MnDR a low-alloy steel with good oxidation resistance? And does it have any impact on the oxide film formed during operation?

{:9022:}Thank you! Previously, Q235B was used for the local concentrated sulfuric acid storage tanks, but the lowest average daily temperature there is -34°C; it’s unclear how the design was conceived at that time. Could an expert please explain whether there is any difference in corrosion resistance between Q235B and 16MnDR, or rather Q345R, under these operating conditions? Does that mean 235B can be used, while Q345R and 16MnDR are also acceptable?

The choice of 16MnDR is based on the consideration that low-alloy steel can be used under low-temperature conditions

Sure, but attention is needed at the exit