Q195, Q235, Q345 hot - dipped galvanized steel plates are common steel products with the following characteristics:

Q195 Hot - Dipped Galvanized Steel Plate

Chemical Composition: The carbon content is 0.06 - 0.12%, manganese is 0.25 - 0.50%, silicon is no more than 0.3%, sulfur is no more than 0.05%, and phosphorus is no more than 0.045%.

Mechanical Properties: It has relatively low strength, with a yield strength of around 195MPa, a tensile strength of 315 - 430MPa, and good elongation, which is convenient for processing and forming.

Applications: Due to its low cost and good corrosion resistance after galvanizing, it is widely used in the manufacture of some low - strength structural parts, such as shed frames, simple roof trusses, and some components of household appliances.

Q235 Hot - Dipped Galvanized Steel Plate

Chemical Composition: The carbon content is generally 0.12 - 0.22%, manganese is 0.3 - 0.65%, silicon is 0.12 - 0.3%, sulfur is no more than 0.05%, and phosphorus is no more than 0.045%.

Mechanical Properties: The yield strength is 235MPa, the tensile strength is 370 - 500MPa, and it has good comprehensive mechanical properties, with certain strength, toughness, and plasticity.

Applications: It is one of the most widely used steel grades, suitable for various general - purpose structures and mechanical parts, such as building structures, bridge components, mechanical equipment shells, and various types of brackets. After hot - dip galvanizing, it is often used in outdoor - exposed structures that require corrosion resistance, such as guardrails and billboards.

 

 

 

 

 

Q345 Hot - Dipped Galvanized Steel Plate

Chemical Composition: It contains 0.2% maximum carbon, 1.0 - 1.6% manganese, 0.55% maximum silicon, 0.035% maximum sulfur, and 0.035% maximum phosphorus. Additionally, it may contain trace amounts of alloying elements such as vanadium, niobium, and titanium to improve its performance.

Mechanical Properties: It belongs to low - alloy high - strength steel, with a yield strength of no less than 345MPa and a tensile strength of 470 - 630MPa. It has higher strength and better toughness than Q195 and Q235, and can withstand greater loads.

Applications: It is mainly used in large - scale engineering structures and mechanical manufacturing that require high strength and good corrosion resistance, such as high - rise buildings, large - span bridges, pressure vessels, cranes, and some key components in the automotive industry.

 

 

 

 

 

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