Differences between National IV and National V diesel standards

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Differences between National IV and National V diesel: Find the quality standards for diesel products meeting National IV and National V requirements, present them in a list in order, and compare the differences in these quality standards: 1. Anti-knock property 2. Volatility 3. Flowability 4. Corrosivity 5. Stability. (1) Anti-knock property: An indicator of a diesel’s anti-knock property is its cetane number. A low cetane number means that it is difficult for the fuel to ignite, the combustion delay period is long, and the engine operates in a rough manner； High cetane number, good ignition performance, short afterflame period, uniform combustion, and stable engine operation ； If the cetane number is too high, combustion is incomplete in certain areas, resulting in black smoke. High-speed diesel engines: 40–60 ； Medium-speed diesel engine: 30–35 ； Low-speed diesel engine: