monel k500 plate A further sizeable issue to look at is the cost. Monel 400 is normally more expensive than Duplex. For that reason, if cost is A serious issue in your job, contemplate Duplex. The MONEL alloy generally known as MONEL K500 was made by the Worldwide Nickel Organization (INCO) being an upgrade to the initial MONEL 400 alloy. T