Yosun (Tianjin) Piping Engineering Co., Ltd. is one of the most credible manufacturers and suppliers of q345 low alloy steel pipe in China. Please feel free to wholesale customized q345 low alloy steel pipe at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.
Q345 steel is a national standard low alloy steel, carbon content is less than 0.2%, adding a small amount of alloy to improve strength, divided into five grades, has excellent mechanical properties, low temperature properties and processing properties. It is widely used in construction, Bridges, vehicles, ships and other fields. The yield strength of Q345 steel is greater than 345MPa, according to the standard requirements with the increase of material thickness, the lower yield limit will be reduced accordingly.
Process Flow
◆ Sanitary mirror tube process flow: Tube blank - Inspection - Peeling - Inspection - Heating - Piercing - Acid washing - Grinding - Lubrication and air drying - Welding head - Cold drawing - Solution treatment - Acid washing - Passivation - Inspection - Cold rolling - Degreasing - Head cutting - Air drying - Internal polishing - External polishing - Inspection - Marking - Finished product packaging
◆ Industrial tube process flow: Tube blank - Inspection - Peeling - Inspection - Heating - Piercing - Acid washing - Grinding - Lubrication and air drying - Welding head - Cold drawing - Solution treatment - Acid washing - Passivation - Inspection
Chemical Composition
The new version of the GB/T1591 standard replaces Q345 with Q355, emphasizing the optimization of carbon equivalent through increasing manganese and reducing carbon, while taking into account both mechanical properties and weldability.
Application in High-Cold Regions
In high-cold areas, Q345D steel is widely used, especially in transmission towers and building structures. In Tibet, China, the temperature difference between day and night can reach 40℃ in extreme cases, and the lowest temperature in winter can drop below -30℃. Q345D steel is used to manufacture the steel structures of transmission towers and buildings in this region (such as scenic area viewing platforms and tourist centers). These steel structures need to ensure toughness and strength in low-temperature environments.
Q345D steel has good low-temperature toughness and can maintain its performance in extremely low temperatures, which is crucial for ensuring the stable operation of power grids and the safety of buildings.
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