scope:

This standard describes requirements for quenched and tempered steel plates, known as Q1 (Navy) from 6mm thick up to and including 150mm thick.

The standard covers the quality control checks to be carried out on each production plate by approved manufacturers of Q1 (Navy) plate.

Q1 (Navy) plate can only be produced by suppliers who have successfully obtained route approval. The method of obtaining route approval is described in ANNEXES A and B.

This Def Stan comprises the following Parts:

Part 1 Plates

Part 2 Forgings

Part 3 Castings

Part 4 Rolled

It should be noted that Part 4 (Thickness measurements) and Part 6 (Ultrasonic Acceptance Standards) of NES 736 Issue 2 have now been incorporated into this standard.