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Commonly used low alloy structural steel

Commonly used low alloy structural steel

16Mn is the most widely used and most productive type of low-alloy high-strength steel in my country. The structure in use state is fine-grained ferrite-pearlite, the strength is about 20%-30% higher than that of ordinary carbon structural steel Q235, and the atmospheric corrosion resistance is 20%-38% higher.

15MnVN is the most used steel in medium-strength steel. It has high strength, good toughness, weldability and low-temperature toughness, and is widely used in the manufacture of large structures such as bridges, boilers, and ships.

After the strength level exceeds 500MPa, the ferrite and pearlite structures are difficult to meet the requirements, so low carbon bainitic steel is developed. The addition of Cr, Mo, Mn, B and other elements is conducive to obtaining bainite structure under air cooling conditions, which makes the strength higher, the plasticity and welding performance are better, and are mostly used in high-pressure boilers, high-pressure vessels, etc.

 

Characteristics of heat treatment

This type of steel is generally used in a hot-rolled and air-cooled state and does not require special heat treatment. The microstructure in the use state is generally ferrite + sorbate.

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