Anti rust ability of 4140 ph plate

4140 ph plate，first of all,we need to understand this material.

Generally, the common antirust elements are Cr and nickel. The Cr content of 4140 ph plate is only 0.9-12.0; The requirement of Ni is less than 0.3. the antirust Cr should be 12.5% at least, and the basic antirust ability can only be obtained when Ni is more than %5.00.

4140 ph plate is a high-strength low-alloy steel with high strength and toughness, good hardenability, tempering brittleness is unobvious, high fatigue limit and multiple impact resistance after quenching and tempering treatment, and good low-temperature impact toughness. The steel is suitable for manufacturing large and medium-sized plastic molds requiring certain strength and toughness.

This kind of steel has no anti-corrosion performance.so,it might rust. It can’t be said that it is easy to rust. It mainly depends on preservation.

To prevent rust, it is necessary to carry out surface anti-corrosion treatment. If the surface is oiled, it is not easy to rust. The most common surface consition is black surface.