What factors will affect the performance of GBT 8162 Q345B seamless steel pipes

GBT 8162 Q345B seamless steel pipes are made up of various elements. The different proportions combination of the elements decide distinct mechanical properties of GBT 8162 Q345B seamless steel pipes. The amount of any one element will directly affect the mechanical properties of Q345B seamless pipe. Let's learn about the elements that affect the performance of Q345B seamless pipes.

Carbon: with the increase of carbon content, the yield point and tensile strength of GBT 8162 Q345B seamless steel pipes will also increase, but plasticity and impact properties will decrease. High carbon content easily leads to intergranular corrosion failure.

Silicon: Si is a deoxidizer and desulfurizer. It has high strength and hardness, and can improve the hot workability of Q345B steel.

Chromium: Cr can significantly improve the strength, hardness and wear resistance of Q345B steel, but at the same time, it will reduce the steel plasticity and toughness.

Nickel: Ni can improve the strength of GBT 8162 Q345B seamless steel pipes, and make the Q345B steel maintain good plasticity and toughness.

Molybdenum: the added Mo can improve the mechanical properties of GBT 8162 Q345B seamless steel pipes.

Titanium: Ti is a deoxidizer in steel, which reduces effectiveness sensitivity and cold brittleness. A certain amount of titanium has the ability to resist intergranular corrosion.

Phosphorus: P is a harmful element in steel, which increases the cold brittleness of the steel, degrades the welding performance, reduces the plasticity, and makes the cold bending property deteriorate. Under normal circumstances, the lower the content of phosphorus in steel is, the better.

Sulfur: S is a harmful element in steel, which causes the steel to produce thermal brittleness, reduce the ductility and toughness of steel, easily cause cracks in forging, and also reduce the corrosion resistance of steel. So the content of sulfur must be controlled as low as possible.

Nitrogen: N can improve the strength, low temperature toughness and weldability of GBT 8162 Q345B seamless steel pipes.

The above elements have a great influence on the performance of GBT 8162 Q345B seamless steel pipes.