Flaw detection of 09MnNiDR steel plate:A. The steel plate delivered in the normalized or normalized and tempered state with a thickness greater than 20mm and the steel plate delivered in the quenched and tempered state with a thickness greater than 16mm shall be subject to ultrasonic inspection one by one.
B. Other thickness steel plates can also be ultrasonically tested one by one after negotiation between the supplier and the buyer
C. The ultrasonic inspection standard of BBN steel 09MnNiDR steel plate shall be implemented in accordance with GB/T2970 or JB/T4730.3 or GB/T28297. The inspection standard and qualified level are indicated in the contract.
09MnNiDR steel plate quality description
A. No defects such as cracks, bubbles, scars, folds and inclusions on the surface of the steel plate are harmful to use. There must be no delamination of the steel plate. If the above surface defects are allowed to be cleaned, the cleaning depth should be no more than half of the steel plate thickness tolerance from the actual size of the steel plate, and the lower limit thickness of the steel plate should be guaranteed to be cleaned, and the defect cleaning should be smooth and without edges.
B. Other defects are allowed, and the depth shall not exceed half of the allowable tolerance of the thickness of the steel plate from the actual size of the steel plate, and the thickness of the steel plate at the defect shall not be less than the minimum allowable thickness of the steel plate.
Scope of application
09MnNiDR steel plates are mainly used in petroleum and chemical equipment deethanizers, CO2 absorption towers, medium pressure flash towers, coolers, deethanizers, reabsorption towers, compressor casings, propane cryogenic storage tanks, etc., petrochemical equipment , Power stations, boilers, etc., used to make reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, nuclear reactor pressure shells, boiler drums, liquefied petroleum gas cylinders, high-pressure water pipes of hydropower stations, and turbine worms Shell and other equipment and components.
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