Chloride Stress Corrosion Cracking

[PAN]

Refer to ASM Handbook Vol. 11, chloride plus moisture contribute to stress-corrosion cracking (SCC) of high- strength steels.

Refer to API RP 571, carbon steels and low alloy steels are not susceptible to chloride stress corrosion cracking.

Please advise me about the discrepancy in these documents.

 

[unclesyd]

If you go back and read the section that you got your statements from you will find that the difference comes when you define carbon and low alloy steel and high strength steel. A value of f 160,000 ksi UTS is normally the break point used to differentiate the between the two families of steels. API is talking about below 160,000 ksi and ASM is talking about above 160,000 ksi strength levels.

This topic gets complex rather quickly. Look at the FAQ's under the Welding, Bonding & Fastener Engineering Forum for more information. If that doesn't answer your question or need more information please post.

 

[PAN]

unclesyd,

Thanks for the comment. I think you intend to specify 160 ksi instead of 160,000 ksi.

I cannot find such FAQ's under the Welding, Bonding & Fastener Engineering Forum. Could you please show me the link?

 

[unclesyd]

And everyone say's those Cosmic rays don’t affect people.

By the way if you find the 160,000 ksi steel let me know.

The 160 ksi is still a good number.

Check the references in faq725-600. I'll have to check the forum where I thought It was mentioned.

Sorry about that.

 

[PAN]

I found the context in ASM Metal Handbook Vol.1 (10 Edition). High-strength carbon and low alloy steels have yield strengths greater than 250 MPa (40 ksi). This is far from tensile strength of 160 ksi as unclesyd's comment.

From ASM Handbook Vol.11, steels with yield strengths of approximately 1379 MPa (200 ksi) or higher are especially susceptible to SCC. However, SCC failures of mild steel and low-strength alloy steels are also quite common.

I would like to ask for the comment especially for chloride SCC in high strength steel. Please share your experience.

 

[rnd2]

PAN

thread725-95071 is quite informative.