Report copyright - Steels for Oil- and Gas- Exploration · PDF fileAISI 4130/1.7216 (API 6A/NACE MR 01.75), Firmodur 7216 AISI 4140 H – L 80/1.7223 (API 6A/5 CT/NACE MR 01.75), Firmodur 7273
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