사워 서비스 볼팅
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ASTM A193 등급 B7M 합금강 헤비 육각 볼트
ASTM A193 Grade B7M alloy steel heavy hex bolts combine chromium-molybdenum bolting chemistry with restricted hardness for pressure-equipment connections where the project requires B7M.
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ASTM A320 등급 L7M 합금강 헤비 육각 볼트
ASTM A320 Grade L7M alloy steel heavy hex bolts combine low-temperature impact requirements with restricted hardness for pressure-equipment joints where the project specifies L7M.