Marking of Stainless Steel and Titanium 3

[Seeker88]

Hi folks,

I have received a question from one of our inspectors relating to the use of marker pens on Stainless Steel and Titanium. Can anyone please advise if there are any standards relating to good practice etc when using markers on these materials. In particular, are low chloride markers OK for these material groups.

To add further information, the products will be seeing service in the chemical industry at temperatures of up to 350 deg C.

Many thanks for any advice or help you can offer.

 

[unclesyd]

Here is the old standard we used for component marking. We also required low sulphur markers for Nickel Alloys. I don't know if this is still the standard used or if something else has superseded it

RTD-F7-3T

http://www.osti.gov/bridge/purl.cov...4DEB18083E767ADD4DCB7B8?purl=/4191589-Tv22od/

Both of the links below reference this standard.

http://www.stoodyind.com/Catalogs/FISC/current/05catpg560.pdf

http://www.markingpendepot.com/highpurityactionmarker-fineline-checkourvolumediscounts.aspx

 

[eyec]

any inspector experienced with SS knows low/no chloride markers are required.

never known any problem with chloride containing markers on titanium.

 

[vanmorrison]

unclesyd,

Great references and examples! I am going to save it.

I also believe their is a SHARPIE that may meet halogen ppm limitations.

I am also interested in any more information pertaining to halogens on Titianium and sulphur on Nickel Alloys.

 

[unclesyd]

There is picture in the first link of cracking caused by Sulphur on a nickel alloy. The old yellow grease crayons were the worst offenders. One of our shop demonstrations was to put a mark on a Monel Alloy and weld across the mark. Nine out of ten times the Monel would crack at the mark. Lead and phosphorus also can cause cracking, but Sulphur is the worst offender.

http://www.stainless-steel-world.net/pdf/11012.pdf

http://www.markal.com/prod/137/dura-ink10-black.aspx

Here is a little information on the use of halogenated solvents on titanium. There is a very good paper that discusses the cracking of Titanium in various media, that I can't locate. The paper probably came off Metadex.

Our experience with environmental cracking of Titanium was with 1280 hole spinnerets. To insure cleanliness of same we ran them through a enclosed vapor degreaser using Perclean. We had had no problem until the Perclean got a little old. We started seeing cracking of the ligaments between the capillaries and cracking like radial flange cracking on the periphery,

http://www.ressuage-magnetoscopie-penetranttesting-magnetictesting-dpc.info/pdf/SpecifUK.pdf

http://www.casa.gov.au/wcmswr/_assets/main/download/orders/cao108/10810.pdf

 

[vanmorrison]

Unclesyd,
Thank you for sharing your knowledge and resources.

 

[EdStainless]

Black Sharpie is fine, but no colors and no other makes than Sanford.

Never let anyone use a paint marker. period
I feel the same way about grease pencils and other similar 'china markers'.

RDT-F7-3T is obsolete, but there is no replacement. We still use it as a guide and have written our internal practice to meet it.

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