Hainan Steel tells you: construction steel materials site acceptance requirements

Steel use steel, welding materials, coating materials and fasteners should have quality certificate, must meet the design requirements and existing standards. Raw materials approach, in addition must have a manufacturer's quality certificate outside, and should be in accordance with contract requirements and the existing provisions under the witness of the Party, supervision, on-site witness sampling, sample, test and inspection, carry out inspection records. Supply and supervision of the Party to the inspection report.
Steel surface must not have scars, cracks, folding and delamination defects; steel end side or the fracture should not have layers, slag. These defects should be piled separately, in order to study treatment. Corrosion depth of the steel surface, the thickness of no more than 1/2 of the negative deviation value; and shall conform to the national standards for Class C and above. Do not use dropped or solder coating core rod rust, moisture caking or molten solder and burnt rusty wire.
Steel engineering alternative materials. Because individual steel varieties, specifications, performance can not meet the need for information on alternative design requirements, to be agreed by the design unit and the Department of Alternative A document, generally high strength materials is an alternative low-intensity data, thin to thick generations. High strength bolts should be torque coefficient retest. Hainan Steel