Atmosphere corrosion resistance of GBT 4171 Q295NH weatherproof steel sheets

GBT 4171 Q295NH weatherproof steel sheets have excellent atmosphere corrosion resistance and energy saving characteristics.

Therefore, GBT 4171 Q295NH weatherproof steel sheets are usually used to make containers, rolling stock, oil derrick, seaport building, oil extraction platform and containers containing hydrogen sulfide corrosion medium in chemical petroleum equipment.

The excellent atmosphere corrosion resistance of GBT 4171 Q295NH weatherproof steel sheets is mainly up to the trace elements such as phosphorus, copper, chromium and nickel in the steel. The trace elements promote Q295NH steel form a protective film with dense and strong adhesion on the surface, which prevents the rust from spreading and developing, and protects the underlying matrix of rust layer to slow down its corrosion rate. It greatly improve the atmosphere corrosion resistance of GBT 4171 Q295NH weatherproof steel sheets.