How to quickly identify the steel grade

There are many kinds of iron and steel materials, and their properties can be different. Therefore, it is necessary to identify the steel grade. The commonly used methods of identifying steel grade are spark identification, color mark identification, fracture identification and timbre identification. For example, the identification method of 45# steel can be to make sparks with a grinder, and the sparks float disorderly and large; Using the iron block with moderate hardness to knock, the larger the trace is, the softer the material is.

There are many methods to identify the steel grade. The key is to have certain knowledge of steel products. The specific methods are as follows: 1. Checking the mill test certificate. 2. Checking the steel marks. 3. According to the appearance of steel, we can also simply distinguish the major categories. 4. Checking the metallographic structure. 5. Checking hardness. 6. Sparking. The most reliable method to identify the steel grade is chemical composition test.