Which steel type has no gas formation during solidification?

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Study for the AIT Welder 2nd Period Test. With flashcards and multiple choice questions, each question offers hints and explanations. Prepare confidently for your certification!

Multiple Choice

Which steel type has no gas formation during solidification?

Explanation:
The important idea here is how the level of deoxidation affects gas formation during solidification. When steel is fully deoxidized, as in killed steels, there’s very little dissolved hydrogen left to evolve as gas as the metal solidifies, so virtually no gas pockets form. Rimmed steels, by contrast, are less deoxidized and develop hydrogen porosity during solidification, leading to gas pockets, especially near the surface. Semi-killed and capped steels sit in between, with some tendency for porosity but not as pronounced as rimmed. So the type that has no gas formation during solidification is the fully deoxidized, killed steel.

The important idea here is how the level of deoxidation affects gas formation during solidification. When steel is fully deoxidized, as in killed steels, there’s very little dissolved hydrogen left to evolve as gas as the metal solidifies, so virtually no gas pockets form. Rimmed steels, by contrast, are less deoxidized and develop hydrogen porosity during solidification, leading to gas pockets, especially near the surface. Semi-killed and capped steels sit in between, with some tendency for porosity but not as pronounced as rimmed. So the type that has no gas formation during solidification is the fully deoxidized, killed steel.

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