题目内容

Plain low carbon steels are susceptible to hydrogen induced cracking.

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Comparing with low carbon steels, high carbon steels are with better weldability.

It is advisable to take advantage of auto-tempering to avoid hydrogen induced cracking in HTLA steels welding.

Lower bainite may be found in postweld microstructure of QTLA steels.

Coarse grain in HAZ may cause toughness decrease.