With a lack of quality responsibility and even a mercenary approach, which ultimately leads to frequent problems in the quality of painting projects. Therefore, the supervising engineer must attach great importance to the rust removal and coating work, and strictly inspect and accept each process, which is the foundation and guarantee to ensure the coating quality of steel structures. Regarding the coating quality of steel structure engineering, the following work should be done well:

Ⅰ. The raw materials can be recycled, contributing to environmental protection and sustainable development The development of steel structure is especially significant for China, which is in shortage of resources and energy, because China is the world's largest country in brick masonry and concrete construction. Steel is a high-strength, high-efficiency material with a high recycling value, and the corners are also valuable and do not need to be molded for construction. At present, the international attention of the new residential products have been introduced into China, its environmental protection and energy-saving features are mainly reflected in two aspects (1) the type of housing using a fully enclosed thermal insulation and moisture-proof system, small temperature changes, low heat loss. Regardless of winter and summer, it has comfortable when living environment. When the outdoor temperature is 0 degree Celsius, the indoor temperature can still be kept above 17 degree Celsius; when the outdoor temperature reaches 30 degree Celsius, the indoor temperature is only about 21 degree Celsius. (2) Compared with the brick and mortar structure, it can save more than 60% of energy, and the air-conditioning equipment can save more than 30% of electricity consumption in winter and summer, and the waste utilization of the structure is 100%. Compared with the brick and mortar structure, the steel structure maintains a small wall area under the same floor net height condition, which saves the energy required for air-conditioning and reduces the maintenance cost.

（1） Fabrication of steel members Steel structure fabrication includes deepening, setting out, marking, cutting, welding, correction, and other links. The anti-slip coefficient of the friction surface after high-strength bolt treatment shall meet the requirements. Shot blasting and spraying shall be carried out after the production is completed and the quality is qualified. The level of shot blasting and coating thickness must also meet the requirements of the drawing. Generally, 30~50mm shall be reserved at the installation weld for the time being.