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INVESTIGASI PENGARUH HEAT TREATMENT TERHADAP KEKERASAN BAJA KARBON S40C PADA PROGRESSIVE DIES. J.FO [Internet]. 2022 Mar. 31 [cited 2026 May 16];5(1):19-24. Available from: https://e-journal.polmanceper.ac.id/index.php/foundry/article/view/66