42CrMo4 rust resistance situaion

42CrMo4 rust resistance-First of all, we need to understand this material chemical conponent. The common anti-rust elements are Cr and nickel. The 42CrMo4  contains only 0.9 to 12.0 Cr.

Requirements of Ni are less than 0.3, general rust prevention Cr at least to reach more than 12.5, Ni to reach more than 5.00 have basic rust prevention ability.

42CrMo4 steel is a high-strength low-alloy steel with high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and resistance to multiple impact after quenching and tempering, and good low-temperature impact toughness. The steel is suitable for manufacturing large and medium-sized plastic mold which require certain strength and toughness.

This kind of steel is not corrosion-resistant to begin with, so it looks that it is easy to rust. Actually,we could not tell it’s a kind of steel that rust easily by this condition, mainly count on the packing preservation.

In order to prevent rust, it is necessary to carry out surface anti-corrosion treatment. If the surface is oiled, it is not easy to rust.

Let’s see the chemical conponent.

C:0.38~0.45;Si≤0.40;Mn：0.50~0.90；S：≤0.035；P≤0.035，Cr：0.9~1.2；Mo:0.15~0.25

We are the stockist of 42CrMo4 plate with most completely size in South of China,and we have 20 years experience,and cooperation with America,Latin America, Europe, Middle East, Southeast Asia etc.

And we place orders to factory every month,both foreign trade and domestic trade are available,Many domextic trading company are our regular customers.0 complain from them.

Most companies demand Hot roll black surface,and Hot roll ,black surface,Q+T condition.

If the thickness over 180mm,we shall offer forged&black surface, and forged&milling surface,some countries demand heat treatment Normalized.

There are 1500 tons regular inventory in our stock of 42CrMo4 plate,if you want to know more about it.No matter chemical component of mechanical component .

Your are welcome to talk with me.