Structural steel and cold-formed steel are two commonly used steel materials. Q235A and Q235B are two grades of structural steel, and SPCC and DC01 are two grades of cold-formed steel.
Structural steel mainly bears heavy loads, such as buildings and bridges, and has strength requirements. Cold-formed steel is used to make simple shapes, such as home appliance parts, and does not require high strength.
Today we will take a closer look at these 4 grades and the differences between the two types of steel.
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Q235A and Q235B
Structural steel plays a vital role in the fields of construction, machinery manufacturing, etc. Q235A and Q235B are two common carbon structural steel grades specified in my country's standard GB/T 700-2006 "Carbon Structural Steel". There are mandatory requirements for yield strength: not less than 235MPa, and their main difference lies in the requirements for low-temperature impact performance. Q235A steel has no special requirements for low-temperature impact performance. This means that in a low-temperature environment, the toughness and plasticity of Q235A may be reduced, but there is no specific standard to specify its impact value. Therefore, Q235A is mainly suitable for structural parts that have no special requirements for low-temperature impact performance. Q235B steel has requirements for low-temperature impact performance at a normal temperature of 20 degrees. This means that at a normal temperature of 20 degrees, the impact value of Q235B must meet certain standards to ensure its toughness and plasticity in a low-temperature environment. Therefore, Q235B is mainly suitable for structural parts that have special requirements for low-temperature impact performance.
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SPCC and DC01
Unlike structural steel, cold-formed steel is mainly used to make simple shapes, such as equipment parts, home appliances, etc., and there is no special requirement for strength. SPCC and DC01 are two commonly used cold-rolled steel plate grades, which follow Japanese standards and European standards respectively. SPCC is a Japanese standard grade, and the standard it follows is JIS G 3141 "Cold-rolled steel plates and strips". SPCC steel has good processing properties and is suitable for manufacturing various stampings and cold-bent parts, such as automotive parts, home appliances, etc. Since the strength and hardness of SPCC steel are relatively low, it is not suitable for application scenarios with special requirements for strength. DC01 is a European standard grade, and the standard it follows is EN 10130 "Cold-rolled non-alloy steel plates and strips". DC01 steel also has good processing properties and is suitable for manufacturing various stampings and cold-bent parts, such as buildings, furniture, electrical appliances, etc. Compared with SPCC, DC01 has different chemical composition and mechanical properties, but it is also not suitable for application scenarios with special requirements for strength and is an approximate grade.
