Q355GNH weathering steel details

Q355GNH is a kind of high weather resistance low alloy structural steel plate with excellent mechanical properties and corrosion resistance.

Q355GNH weathering tempering chemical components

The chemical composition of Q355GNH mainly includes two parts: conventional elements and alloy elements. Conventional elements with carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), alloy elements including copper (Cu), molybdenum (Mo), titanium (Ti), vanadium (V), niobium (Nb), chromium (Cr), nickel (Ni), etc. The specific chemical composition content range is as follows:

Carbon (C) : ≤0.12%

Silicon (Si) : 0.20%~0.75%

Manganese (Mn) : ≤1.00%

Phosphorus (P) : 0.07%~0.15%

Sulfur (S) : ≤0.020%

Copper (Cu) : 0.25%~0.55%

Molybdenum (Mo) : ≤0.30%

Titanium (Ti) : ≤0.10%

Vanadium (V) : ≤0.12%

Niobium (Nb) : 0.015%~0.060%

Chromium (Cr) : 0.30%~1.25%

Nickel (Ni) : ≤0.65%

Q355GNH weathering steel mechanical properties

The mechanical properties of Q355GNH mainly include tensile strength, yield strength, elongation, etc. The specific mechanical properties are as follows:

Tensile strength: ≥510 MPa (The tensile strength range provided by some data is 490~630 MPa, which may be related to the specific production process and heat treatment state)

Yield strength: ≥355 MPa

Elongation: ≥19% (usually with a high elongation rate to ensure that the steel can undergo large plastic deformation without damage when stressed)

Q355GNH weathering steel delivery status and smelting method

Q355GNH steel plates are usually delivered in hot rolled, controlled rolled or normalized condition. These delivery conditions can ensure the mechanical properties and weather resistance of the steel. In terms of smelting methods, Q355GNH steel is smelted by oxygen converter or electric furnace, and adopts off-road refining process to ensure the quality and performance of steel.

Q355GNH weatherability of weathering steel

Q355GNH has good weather resistance and can resist atmospheric corrosion and oxidation for a long time outdoors. This is due to the addition of alloying elements in the smelting process, which can form a dense protective film on the surface of the metal, thereby improving its atmospheric corrosion resistance. Its weather resistance is 2 to 8 times that of ordinary carbon steel, and its coating property is 1.5 to 10 times that of ordinary carbon steel.

Q355GNH weathering steel application field

Q355GNH is widely used in various fields due to its excellent corrosion resistance and mechanical properties, including but not limited to:

Rolling stock

Oil derrick

Harbour building

Production platform

Chemical petroleum equipment containing hydrogen sulfide corrosion medium container and other structural parts

At the same time, the Q355GNH is also suitable for the manufacture of various mechanical parts, equipment bases and supports. In the construction industry, Q355GNH Angle steel is widely used in the manufacture of various structural components, such as beams, columns, frames, etc. Its high strength and good toughness make the building more stable and safe.