The prefab building of steel for architecture

Steel is a kind of material which is made into all kinds of shape, size and property we need by press working on steel ingot and billet. Architectural steel can be divided into steel structural steel and concrete structural steel. Steel structural steel is mainly low alloy steel (Q345 serious) and constructional steel panel (Q235 serious), part of the important structure design will be requested using Z-tropism performance material like z15, z25 and z35. Light steel frame use Q235 material most, heavy steel frame use Q345 material most, built-in foundation bolt use Q235 steel rod most and brace use hot-rolled steel bar most, besides, angle iron, U-bar and H steel have a small amount to use. The steel material of concrete structure are deformed steel bar, wire rod and structural steel.

Sand blast after the completion of the first response to the site to conduct a comprehensive inspection, second check the matrix steel cleanliness and roughness.Key check is not easy to injection parts, manual or power tool cleaning can be appropriately reduced requirements.The matrix steel cleanliness and roughness inspection, first, it is forbidden to touch;second it is to should be in a good or scattering sunlight illumination rather artificial lighting conditions, so as not to miss.

After sandblasting derusting, metal structure surface cleanliness should reach Sa21/2, should control the corrosion of steel surface before painting class and descaling grade provide photos in comparison, comparing each 2 m2 has at least one more point.

Sandblasting derusting, metal structure surface roughness should reach Ry60 ~ 100 μ m, should be in accordance with the technical requirements, the corresponding roughness model, mirror amplified compared with at least 7 times magnification, is at least every 2M2 has a point of comparison.

Surface roughness instrument for direct determination of 2M2, each surface must have at least one rating point, the length is 40mm, the length within the range of 5, the arithmetic average value for this assessment of the surface roughness value.