The ASTM A735 steel plate standard usually stipulates the hardness requirements for steel plates, which may include the following:

1. Hardness test method: Specifies which method (such as Rockwell hardness, Brinell hardness, etc.) is used to measure the hardness of the steel plate.

2. Hardness value range: Specify the hardness value range that the steel plate should reach after specific heat treatment or conditions.

3. Hardness test location: A specific location or multiple locations for hardness testing on the steel plate may be specified to ensure that the overall performance meets the requirements.

4. Hardness tolerance: For steel plates of different thicknesses or different parts, the hardness tolerance range may be specified to ensure product quality consistency.

5. Special hardness requirements: For steel plates with specific uses or special performance requirements, there may be additional hardness requirements or test methods.

Specific hardness requirements should be determined based on the latest version of the ASTM A735 steel plate standard and related specifications. It is recommended to consult the latest ASTM A735 steel plate standard document for detailed and specific hardness requirements.