Comparison Of Q235R And Q345R

Comparison of Q235R and Q345R

The table above shows that except for Element Si and Mn content are different, other elements' limitation of Q245R and Q345R are the same. As boiler steel weld performance is influenced by its chemical element content, especially for Carbon content. As carbon content in the steel increases, steel plasticity decreases, steel hardening tendency tends to increase, and crack would be easy to produce. Generally steel plate contains many alloy elements, together they have comprehensive influence on steel mechanical property. So Carbon Equivalent is key figure for calculating steel weld performance. Usually steel plate with Ceq<0.45% has good weld performance.

For Q345R has higher Mn content, its CeQ is 0.1% higher than Q245R. Q345R notch sensitivity is larger than Q245R, low fatigue strength made it easier to produce cracks when welding. So in some application environments, it shall be considered on the medium that can influence these 2 steel types. For example: in wet H2S stress corrosion environment, for low carbon steel q235r and Carbon Manganese steel q345r, Ceq<0.40%. As Q245R has lower Ceq, it has better H2S Stress Corrosion Resistance performance.

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