Using ISO 15156-3:2015 Guidelines for Threading

Threads produced using a machine-cutting process are acceptable, and threads produced by cold forming (rolling) are acceptable on CRAs and other alloys if the material and the limits of its application otherwise comply with this part of ISO 15156.

But does this mean that it is generally acceptable to use a material that complies with the ISO 15156 series and produce a thread by cold forming with the material? Or do specific tests need to be done on the thread produced by cold forming, and which specifications and threshold values need to be used?

Understanding Cold Forming Threads with ISO 15156-3:2015

It is generally acceptable to use a material that complies with the ISO 15156 series and produce a thread by cold forming with the material. Threads produced by cold forming are acceptable as long as the final threaded product meets the requirements, including chemical composition and mechanical properties, of the specific material used for its manufacture, as described in ISO 15156-3:2015.

However, if the CRA materials (including manufactured products) do not meet the requirements of ISO 15156-3:2015, qualification shall be done per ISO 15156-3:2015 Annex B. It is the manufacturer’s responsibility, in close collaboration with the end-user, to define a suitable testing plan to ensure that the final manufactured product is appropriate and fit-for-purpose for the intended sour service application.

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