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OP here. MJCronin is correct. This relates to blending natural gas with hydrogen. The issue is that some legacy materials are martensitic SSTs and higher strength carbon and alloy steels. These materials are susceptible to hydrogen environment embrittlement. Note that a higher cost is okay...

Thanks Ed. I didn't realize I could use Nitronic 50 in the strain hardened condition with hydrogen.

Thanks for the reply. To get a little more specific, I'm adapting an existing product to meet a hydrogen application. The current product has some wetted trim parts made from high strength carbon and alloy steels that have considerably higher strength than austenitic SST. If I use a lower...

I know that in general low strength carbon steel, austenitic SST, copper alloys and aluminum alloys are resistant to hydrogen embrittlement caused by exposure to gaseous hydrogen. However, I'm in need of a stronger material than these. What higher strength materials that are compatible with...

ISO 11114-1:2020 Section 6.2 has the following statement: "For gas mixtures containing gases causing embrittlement the risk of hydrogen embrittlement only occurs if the partial pressure of the gas is greater than 5 MPa (50 bar) and the stress level of the cylinder material is high enough."...

I'm finding conflicting information when it comes to the suitability of some NACE MR0175 materials in hydrogen service. My specific application is hydrogen blended with natural gas. Pressures range from less than 1 psi to 1500 psi. Temperatures can be from -20F to 120F. Hydrogen...

Pressure - up to 1500 psi Temperature - 0 to 120F Hydrogen concentration - 5% to 100% with the balance being clean natural gas Thanks!

What are the recommended materials for wetted helical compression springs in hydrogen service? I've read that Elgiloy and MP35N are good. What about Inconel X-750 with precipitation heat treatment (4 hours @ 1200F)? Any others? Thanks!

The material is ASTM A276 S31600 Condition B.

A lot of studies recommend 316 SST for hydrogen service. However, the condition of the material is seldom mentioned so I assume it is annealed. My question is whether or not strain hardened 316 SST is suitable for hydrogen service. Does the stress state (e.g. pressure retaining component...