Issue of chloride content in hydrostatic testing of containers made of nickel and nickel alloys
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Dear experts, I have a question. Compared to GB/T150.4-2011, clause 11.4.2.1 of the new GB/T150.4-2024 adds requirements regarding chloride content for hydrostatic testing of containers made of nickel and nickel alloys. Does this mean that such containers (such as those with a surfacing layer of TP6625) are not suitable for use in seawater environments? Which surfacing material is more suitable for seawater use?
Most steel materials are not suitable for seawater environments.
In accordance with the requirements of the new GB/T150.4-2024, stricter regulations have been set regarding chloride content in pressure tests for containers made of nickel and nickel alloys; this indeed means that the use of these materials in seawater environments will be restricted. For seawater environments, stainless steel (such as 316L or Duplex stainless steel) or specific corrosion-resistant alloys (such as Hastelloy C276, C22, etc.) can be considered as surfacing materials, as they exhibit good corrosion resistance in seawater. When making a choice, the working environment and material properties must be considered comprehensively. .