The effects of hydrogen embrittlement ___________ with _________ temperatures.

Sigma phase occurs in Ferritic, martensitic, austenitic and duplex stainless steels when exposed to temperatures in the range of _____.

In most cases, brittle fracture occurs only at temperatures below the Charpy impact transition temperature. Steel cleanliness and ________ have a significant influence on toughness and resistance to brittle fracture.

Primarily hot-wall piping and equipment in the following units can be affected by graphitization. FCC, catalytic reformer and ______.

Most brittle failures appear as: