The steel inspection and control requirements in the ASTM A735 standard include the following aspects:

1. Chemical composition testing: Strictly control and test the chemical composition of steel to ensure compliance with standards.

2. Mechanical property testing: including testing of mechanical properties such as tensile strength, yield strength, elongation, etc. to ensure that the strength and toughness of the steel plate meet standard requirements.

3. Impact test: An impact test is performed to evaluate the toughness of ASTM A735 steel plate under low temperature conditions. Impact absorption energy is usually used to evaluate the impact resistance of the material.

4. Hardness test: Hardness test is performed to evaluate the surface hardness of ASTM A735 steel plate and the strength level of the material.

5. Dimensional tolerance control: Strictly control the thickness, width, length and other dimensions of ASTM A735 steel plate to ensure that they are within the tolerance range specified by the standard.

6. Heat treatment control: Control the heat treatment process to ensure that the steel plate reaches the required structure and performance.

7. Surface quality inspection: Inspect the surface of the ASTM A735 steel plate to ensure that there are no obvious defects or damage that would affect its use.

8. Non-destructive testing: It can include ultrasonic testing, radiographic testing and other methods to detect internal defects of ASTM A735 steel plates and ensure that the quality meets the requirements.

These testing and control requirements are designed to ensure that the ASTM A735 steel plates produced meet the requirements of the standard, have the required performance and quality, and are suitable for applications under high temperature and pressure service.