1. Lifting weight of the plant: 25 tons or more, which can be considered as heavy steel structure.
2, the amount of steel per square meter: greater than or equal to 50KG / m2, can be considered a heavy steel structure.
3, the main component steel plate thickness: greater than or equal to 10MM, light steel structure used less.
In addition, there are some reference values: such as cost per square meter, maximum component weight, maximum span, structural form, height, etc. These can provide empirical data when judging whether the plant is heavy steel or light steel. Of course, many buildings are light. Heavy steel has it. But there are some that we can say with certainty that it is heavy steel: eg petrochemical plant facilities, power plant buildings, large-span stadiums, exhibition centers, high-rise or super high-rise steel structures.