The following contents shall be included in the inspection and test of steel pipe material calibration performance.
(1) When inspecting the steel pipe, if one of the following situations is encountered, the verification inspection shall be carried out
(1) The certificate is inconsistent with the furnace number or steel number of the received steel pipe;
(2) There is no steel number or furnace number on the steel pipe or plate;
③ When the chemical composition or mechanical properties on the certificate are incomplete, the missing items should be tested.
(2) Regulations on steel pipe calibration inspection.
(1) The outer diameter, wall thickness and length of all steel pipes should be measured one by one, and their dimensions should conform to the provisions of relevant standards;
(2) All steel pipes should be numbered and checked for hardness one by one;
③ From each batch of steel pipe with high and low hardness of each one, each one prepared 5 samples, including two tensile test, two impact test, flattening or cold bending test, test methods and evaluation standards comply with the relevant provisions of the state.
(4) Chemical analysis is carried out by sampling steel tubes or specimens for mechanical properties test.
