low alloy steel plate

Low alloy steel plate is the umbrella name of steel plate with alloy content less than 3.5%. Generally, low alloy board is Q345B plate on the market. Alloy steel includes low alloy steel, medium alloy steel and high alloy steel depending on the alloy elements content. The alloy content less than 3.5% is called low alloy steel, 5 —10% is called medium alloy steel and more than 10% is called high alloy steel. On the domestic market, it calls special quality carbon steel and alloy as special steel. The standard is GB/T3274-1988, GB/T1591-1994 for low alloy plate.
 

16Mn is one of the largest consumption and production in our country of low alloy steel high strength steel. The organization of using state is fine pearlitic ferrite. The strength is higher 20%-30% than common carbon structure steel and the atmospheric corrosion resistance is higher 20%-38%.
15MnVN is common use in the medium strength steel grade. This steel has high strength and good toughness, weldability and low temperature toughness. So it is widely used in manufacturing bridges, boiler and ships etc.

When the strength grade is more than 500MPa, the organization of pearlitic ferrite is hard to meet requirements, which will form low carbon bainite steel. If adding Cr, Mo, Mn, B etc. will make much higher strength and good plastic and welding performance. This steel is often used to high pressure boiler and container.

Low Alloy High Strength Steel Plate