(a) Process of manufacture.- The steel used for castings shall be made by the open hearth or electric furnace or any other process which gives steel having equivalent properties.

(b) Chemical analysis:- The ladle analysis shall conform to the following requirements, namely:-

A carbon content not exceeding 0.30% may be accepted subject to the agreement between the boiler maker and the Inspecting Authority.

(c) Heat Treatment.- All castings shall be supplied in the heat-treated condition. The heat-treatment shall consist of annealing, annealing and normalising, normalising, normalising and tempering, or hardening and tempering, either at the discretion of the manufacturer or the Inspecting Officer and shall be carried out at suitable temperatures to give the mechanical properties specified in Regulation 77.

(d) Fettling and Dressing.- All castings shall be properly fettled and dressed and all surfaces shall be satisfactorily cleaned for inspection purposes.

(e) Freedom from Defects.- All castings shall be free from injurious defects. In the event of any casting proving defective in the course of preparation, machining or erection, such casting may be rejected notwithstanding any previous certification of satisfactory testing.