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The three steel grades, P355GH, P355N, and P355NH, all exhibit good strength, toughness, and weldability, making them suitable for manufacturing pressure equipment in different working environments. However, due to differences in chemical composition and heat treatment conditions, their specific properties and applications vary. In practical applications, the appropriate steel grade should be selected based on specific engineering requirements and operating conditions.

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An LPG tank, also known as an LPG container, industrial gas tank, compressed gas tank, or liquefied gas tank, is a special device designed to store liquefied petroleum gas (LPG). LPG is a hydrocarbon gas mixture commonly used as fuel in industrial, agricultural, and commercial sectors.