FAQ's

Cold forming (rolling) of threads and NACE MR0175

 

ISO 15156-3:2015 says about threading:
A.1.5.2 Threading
Threads produced using a machine-cutting process are acceptable.
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.
Is the meaning:
a) it is acceptable in general to use a material that comply with the ISO 15156 series and produce a thread by cold forming with the material
or
b) specific tests are required on the thread produced by cold forming. If yes, which specifications and which threshold values shall be used?

Answer:

a) it is acceptable in general to use a material that comply with the ISO 15156 series and produce a thread by cold forming with the material.
Answer: Threads produced by cold forming are acceptable as long as the final threaded product meets the requirements, including chemical composition mechanical properties, etc.) of the specific material (employed for its manufacture) as described in ISO 15156-3:2015

b) specific tests are required on the thread produced by cold forming. If yes, which specifications and which threshold values shall be used?
Answer: Qualification of CRA materials (including manufactured products) that do not meet the requirements of ISO 15156-3:2015 shall be done per ISO 15156-3:2015 Annex B. It is the manufacturer 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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