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Corrosion cracking of 304L stainless steel pipe clamps

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Case study of stainless steel components of a geothermal heating system failed prematurely. The crack surfaces were brittle in appearance and were predominately transgranular. The failure was determined to be caused by chloride induced stress corrosion cracking. Subsequent failures may be avoided by informed alloy selection.

More informations : Transgranular stress corrosion cracking of 304L stainless steel pipe clamps in direct use geothermal water heating applications.

Fatigue cracking of high pressure oil tube

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  • High pressure pipe failed by fatigue in the fusion line of longitudinal weld.
  • Fatigue was caused by vibration of the line due to clamp missing.
  • Crack initiated and propagated through the high concentration region of weld joint.
  • Change of specified material (UNS S31803) by AISI 304L contributed to the failure.
  • As recommendation, seamless tube of duplex stainless steel must be used.

More informations : Fatigue cracking of high pressure oil tube.

Failure Analysis of Rocker Liner used as a charging system of Blast Furnace

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In this study, failure analysis of rocker liners used for charging system of Blast Furnace was carried out. The failed rocker liner samples shows non-uniform distribution of carbides, resulted in variation of hardness as well as wear properties. After proper heat-treatment and chemistry modification, the Rocker Liner obtained high hardness (with uniformity) due to proper distribution of carbide phases in the tempered martensitic matrix. Thus proper heat treatment is needed to achieve optimum property with changing the material composition to deal with this stringent working condition. Rocker liner with modified microstructure was trailed in the Blast Furnace and it has given a life of around 20-22 months life.

More informations : Failure Analysis of Rocker Liner used as a charging system of Blast Furnace.