Is Q345R resistant to hydrogen corrosion?
Thread Content
Medium composition: H2: 73%, N2: 27%. Design pressure: 6.1 MPa, design temperature: 50. Is Q345R a suitable material for this application? Is Q345R resistant to hydrogen corrosion?
Not resistant to hydrogen corrosion. Q345R(H) should be selected.
Hydrogen corrosion is considered only when the temperature exceeds 200 degrees; Q345R can be used
At 50 degrees, there is no need to consider the hydrogen partial pressure; you can take a look at the Nelson curve. There’s no need to consider temperatures below 200 degrees
Hydrogen corrosion need not be considered below 200 degrees. If SCC caused by H2S is a concern, then Q345R (HIC) should be used
Up to 200 degrees is acceptable; above 200 degrees, it is not resistant to hydrogen corrosion
According to the Nelson curve, hydrogen corrosion becomes a concern above 200°C, and the hydrogen partial pressure needs to be taken into account. Hydrogen-resistant steel 1Cr0.5Mo of American grade ； 1.25Cr0.5Mo ； 2.25CrMo ； Corresponding to China’s 15CrMo grade respectively ； 14Cr1Mo and 12Cr2Mo.