How to Select an Ultrasonic Probe Suitable for A537CL2 Hot - Rolled Boiler Steel Plate and Coil: Consider the Material Thickness

 

Probe Selection for Thick Materials: For thicker A537CL2 hot - rolled boiler steel plates and coils (for example, with a thickness greater than 30mm), lower - frequency (such as 2 - 5MHz) ultrasonic probes are usually preferred. This is because low - frequency ultrasonic waves have less attenuation in the material and can penetrate thicker materials better. For example, when inspecting a 50 - mm - thick steel plate, a 2.5MHz straight - beam probe can effectively transmit ultrasonic waves into the material and receive the reflected signals from defects at deeper positions.

 

Probe Selection for Thin Materials: If the material is thin (with a thickness less than 10mm), in order to obtain higher resolution for accurately detecting tiny defects, higher - frequency (such as 5 - 10MHz) probes should be selected. For example, for a 5 - mm - thick steel coil, a 7.5MHz probe can clearly distinguish smaller pores or inclusions and other defects inside the material.

 

Select the Probe Type According to the Type of Defect to be Detected

 

Straight - Beam Probes for Detecting Parallel Defects: When the main focus is on defects inside the material that are parallel to the inspection surface, such as delamination and internal porosity, straight - beam probes are the appropriate choice. Straight - beam probes emit and receive ultrasonic waves perpendicular to the inspection surface and can effectively detect these types of defects. For example, when detecting possible delamination defects inside A537CL2 steel plates, the straight - beam probe can accurately detect the reflected signals of ultrasonic waves at the delamination interface.

 

Angle - Beam Probes for Detecting Tilted or Weld Defects: If it is necessary to detect defects that have a certain angle with the inspection surface, such as cracks in the welded parts or tilted cracks inside the material, angle - beam probes are more suitable. Angle - beam probes emit ultrasonic waves at a certain angle (such as 45°, 60°, etc.), enabling the ultrasonic waves to strike the defect surface at a suitable angle and making it easier to detect tilted cracks. When inspecting the welds of A537CL2 steel coils or plates, select an angle - beam probe with a suitable angle according to the angle of the weld and the possible direction of the defect. For example, for a V - shaped weld, a 45° angle - beam probe may be selected to detect cracks in the weld.

 

 

 

 

 

 

 

 

SA387GR22CL2

The technical conditions for the supply of SA387Gr22CL2 (2.25Cr-1Mo) steel plate for hydrogen production in China are produced by Wuyang Steel Plant using electric furnace steelmaking. The raw materials are of high purity, good quality, and relatively expensive in terms of cost and price. This technical condition is applicable to the production of SA387Gr22CL2 (2 1/4Cr-1Mo) steel plate for hydrogen equipment with a thickness of ≤ 150mm.

Execution standards

American standard: The size, shape, weight, and allowable deviation of ASTM ASME steel plates shall comply with the provisions of ASME SA387/SA387M standard.

Delivery status

The steel plate shall be delivered in a normalized (ensuring an accelerated cooling rate of ≥ 90% for bainitic structure) and tempered state, with a normalized temperature not exceeding 968 ºC and a tempering temperature not lower than 720 ºC

 

Combine the Detection Precision Requirements and Equipment Compatibility

 

Influence of Precision Requirements: If extremely high detection precision is required, for example, when inspecting A537CL2 steel plates used for high - precision boiler parts, it is necessary to select a probe with high resolution. There may be a tendency to choose a higher - frequency, more precisely - designed probe and match it with a high - precision ultrasonic testing instrument to ensure accurate detection and positioning of tiny defects.

 

Equipment Compatibility Consideration: The selected probe must be compatible with the ultrasonic testing instrument. Different brands and models of ultrasonic testing instruments have different requirements for the parameters of the probe (such as frequency range, impedance, etc.). When selecting a probe, it is necessary to ensure that it can work normally with the existing ultrasonic testing instrument to avoid problems such as poor signal transmission and inaccurate detection results. For example, some ultrasonic testing instruments can only support probes with a specific frequency range and interface type, and the appropriate probe should be selected according to the instrument's manual.

 

 

 

 

 

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