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Concern about the content ration of Ni to Mn is useful to avoid toughness decrease.

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Carbon equivalents may be to estimate the susceptibility to hydrogen induced cracking.

Welding tests are required in weldability analysis.

Because cooling rate was too high, underbead cracks occurred in socket/pipe weldment.

Underbead cracks occurred in oil engine connecting rod because heat dissipation area was large and cooling rate was too high.

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