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The objective of this research is to examine the mechanical properties and micro structure of body valve bolts using the alloy steel grade B7 material after being applied for more than 12 months on offshore location. The experimental steps conducted in the research were specimens check based on maker specification, preparation of specimens, tensile and hardness tests for mechanical properties and metallography for micro structure, analysis and conclusion. The total specimens were 18 bolts. Based on the research, it was found that the tensile strength 94.9 kgf/mm2 and hardness 30.0 HRC, the micro structure was consisting of ferit and pearlit. Comparing the result of testing of the used bolts to the new ones and the standard ones by ASTM A193, it can be concluded the used bolts remained applicable on condition that there is no defect and corrosion existing.

Analysis of Mechanical Properties and Micro Structure of Body Valve Bolts, Alloy Steel Grade B7 Material as a Result of Offshore Application