The external standard of GB/T 8163 Q345C carbon pipe is: GB 709, and the internal standard is: GB/ T1591-94. Due to the implementation of the standard, the GB/T 8163 Q345C carbon pipe allows negative tolerance delivery. The new standard is GB / T 1591-2008.
In addition, one of the most obvious changes of GB/T1591-2008, the latest standard of GB/T 8163 Q345C carbon pipe, is the change of Mn content, which is corrected from 1.0-1.60 to ≤ 1.70, canceling the limit of minimum value.
With the discovery of modern industry and the progress of science and technology, the application of trace elements in steel plate is more extensive. The content of mn is no longer the only factor affecting the strength and mechanical properties of GB/T 8163 Q345C carbon pipe. Therefore, the State Administration of quality Supervision, Inspection and Quarantine of the people’s Republic of China and the State Standardization Administration of China jointly issued and implemented the low alloy high strength structural steel standard.
For the testing of GB/T 8163 Q345C carbon pipe, on the one hand, it is whether the element content of steel meets the national standard, and the most important one is whether the mechanical properties (yield strength, tensile test) of GB/T 8163 Q345C carbon pipe can meet the standard through the professional organization.
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