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Metallographic Etchants - Carbon Steel

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Metallographic Soft or Weldable Steel Etchants

Metallographic Etching

Low Carbon Steel Etchants

The most common etchant for low carbon steels or weld steels is Nital, however, there are a lot of other potential etchant for speicalized etching. A good resouce for additional etchants can be found with the etchant database provided by PACE Technologies, http://www.metallographic.com/Consumables/Etch.htm

Sample Preparation: Low carbon steels and welded steel must be properly prepared to reveal the true metallographic microstructure. A number of recommended procedures can be found at the following links:

http://www.metallographic.com/Etchants/Low%20carbon%20steel%20etchants.htm

http://www.metallographic.com/Brochures/Met-Manual-2b.pdf

CAUTION: Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacturers MSDS. Also review COMMENTS Section for each etchant.

Etchant

Conc.

Conditions

Comments

Nital
Ethanol
Nitric acid

100 ml
1-10 ml

Seconds to minutes

Do not exceed 10% nitric acid-explosive

Picral
Ethanol
Picric acid

100 ml
2-4 grams

Seconds to minutes

Do not let etchant dry-explosive


Metallographic metallograph for etched low carbon steels
1018 Low Carbon Steel (quenched), etched, Mag. 100X


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