Hainan Steel tells you: steel works, steel selection GENERAL PROVISIONS

1, when the steel ordered, the type, size, function, etc. should fit the existing national planning documents and steel standards set.
2, steel purchase contract deal with material trademark, size, function parameters, inspection requirements, size deviation clear agreement. Length of steel should be left a margin of sampling reinspection; delivery status of steel, should function according to planning documents for the steel requirements and supply manufacturers agree.
3, played acceptance of steel, in addition to the provisions of this standard should be fit, there should fit the current national standard "steel construction quality acceptance criteria" of the relevant provisions of GB 50205. Belonging to one of the following steel, should be sampled retest:
1) foreign steel imports;
2) mixed batch of steel;
3) thickness equal to or greater than 40mm, and the planning of slab Z to functional requirements;
4) building structural safety grade level, large span steel structure, the main force of the steel components used;
5) Plan are steel retest requirements;
6) any doubt on the quality of steel.
4, the content of steel retest should include mechanics function test and chemical analysis. Hainan Steel
5, when the planning documents no special requirements, steel construction steel sample used trademark approved retest inspection should be conducted as follows:
1) trademark Q235, Q345 and has a thickness of less than 40mm of steel, shall be the same manufacturer, the same trademark, same quality grades of steel composition inspection batches of components should not be greater than 150t; the same manufacturer, the same trademark for steel cargo weight exceeds 600t and all reinspection when passing Batch batch component can be expanded to 400t;
2) trademarks for Q235, Q345 and has a thickness greater than or equal to 40mm steel, should be the same manufacturer, the same trademark, same quality grades of steel composition checking batches of components should not be more than 60t; the same manufacturer, the same trademark Delivery of more than 600t of steel components and all the time reinspection qualified Batch batch component can be expanded to 400t;
3) the trademark Q390 steel, should be the same manufacturer, same quality grades of steel composition inspection batches of components should not be more than 60t; steel supplier component manufacturer over the same time all the reinspection 600t and qualified, each batch The grant component of the group can be extended to 300t;
4) the trademark Q235GJ, Q345GJ, Q390GJ steel, should be the same manufacturer, the same trademark, same quality grades of steel composition checking batches of components should not be more than 60t; the same manufacturer, supplier of steel components over the same trademark 600t and all reinspection when passing Batch batch component can be expanded to 300t;
5) trademark for Q420, Q460, Q420GJ, Q460GJ steel, each lot shall inspect the same trademark, same quality level, the same heat, the steel of the same thickness, the same delivery status of composition, each batch of components should not be more than 60t;
6) the requirements of the steel sheet in the thickness direction, should additional ultrasonic nondestructive testing by one retest.
6, sampling, sample preparation and experimental methods imported steel reinspection shall planning documents and contract provisions. After customs inspection results of the supervising engineer recognized as an effective material for re-inspection results. Hainan Steel