Research on Wear Resistance of H400 and NM400 Low Alloy Steel
Description of H400 and NM400 Low Alloy Steels
H400 is an ultra high-strength steel alloy characterized by its balanced combination of hardness, toughness and strength. It is primarily composed of carbon, manganese, silicon, phosphorous and sulfur. The alloy contains 12%-15% chromium as well as additions of nickel and molybdenum to further enhance its wear resistance abilities. It is used typically in the production of thick steel plate, allowing for the creation of structures that possess improved wear resistance and tensile strength.
NM400 is also an ultra high-strength steel alloy, however, it differs slightly from H400 in its composition. It is composed mostly of carbon, manganese, silicon and sulfur, with a higher than average chromium content (12%-14%). The alloy is also stated to contain trace amounts of copper and niobium, both of which enhance its toughness and wear resistance capabilities. Due to its high chromium content, NM400 has outstanding corrosion resistance compared to H400, making it ideal for use in harsher environments. It is commonly used in applications such as mining, construction, and quarrying.
Comparison of Wear Resistance of H400 and NM400
The wear resistance of H400 and NM400 has been studied extensively, and the results of these studies suggest that the two alloys possess similar wear resistance. Both alloys are classified as abrasion-resistant steels and offer excellent wear resistance in a variety of conditions. In general, both steels show greater wear resistance than standard structural steel.
When compared directly, however, NM400 shows a slight increase in wear resistance over H400. This is due to the elevated chromium content of the alloy, which results in a stronger protective layer when exposed to abrasive conditions. Furthermore, NM400 also exhibits greater corrosion resistance than H400 due to its higher chromium content. This improved corrosion resistance is beneficial in applications where H400 may be prone to corrosion-related wear.
Conclusion
In conclusion, the wear resistance of H400 and NM400 low alloy steels has been shown to be similar when compared directly. Both alloys are highly wear-resistant and offer improved strength and toughness compared to standard structural steel. NM400 shows slightly greater wear resistance than H400 due to its higher chromium content, in addition to improved corrosion resistance. As a result, NM400 is preferable in environments where wear resistance and corrosion resistance are both factors in consideration.
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