According to ASTM B265 standard, the thickness tolerance for GR2 titanium plates should meet the following requirements:

1. For plates with a thickness less than 6.4mm, the tolerance is typically ±0.13mm.
2. For plates with a thickness greater than or equal to 6.4mm, the tolerance is typically ±0.25mm.

These tolerance ranges are based on general provisions specified in the standard. In practical applications, different tolerance ranges may be determined based on specific requirements or negotiation.

For a GR2 titanium plate with a thickness of 5mm, the standard tolerance range is likely to be ±0.13mm.

The steps to inspect the thickness of GR2 titanium plate are as follows:

1. Use appropriate measuring tools, such as calipers or thickness gauges, to measure the thickness of the titanium plate at various locations. Ensure the accuracy and precision of the measuring instruments.

2. Compare the measured thickness values with the specified tolerance range. In this case, check whether the measured value falls within the range of 5mm ±0.13mm.

3. If the measured value falls within the specified range, the titanium plate meets the thickness requirements of ASTM B265 standard. If the measured value exceeds the specified range, further evaluation is required to determine compliance.

4. Record the measurement results and report them. The report should include the measured values, tolerance range, and whether the titanium plate meets the standard requirements.

5. If there are other inspection items, such as surface quality or chemical composition, they should also be inspected according to the relevant requirements of ASTM B265 standard.

During the inspection, ensure that operators are properly trained and experienced, and use appropriate safety equipment. Use well-calibrated measuring tools and conduct tests under conditions that comply with standard operating procedures. If necessary, seek assistance from professionals or consult relevant quality control organizations.

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