APPENDIX IX 



49 



Process 



Heat 

 Treatment 



SPECIFICATION FOR CAST STEEL 



(In substantial agreement with A.S.T.M. Specification A 27-21) 



MANUFACTURE 



1. The steel shall be made by one or more of the following processes: open-hearth, 

 electric furnace, side-blow converter, or crucible. 



2. Castings shall be properly annealed, the treatment depending upon the design 

 and chemical composition of the castings. A group thus annealed will be known as an 

 "annealing charge". 



CHEMICAL PROPERTIES AND TESTS 



Chemical 3. The castings shall conform to the following requirements as to chemical compo- 



Composition sition : 



Phosphorus /Acid not over 0.06 per cent. 



\Basic " " 0.05 " " 



Sulphur " " 0.06 " 



Ladle 4. An analysis of each melt of steel shall be made by the Manufacturer to determine 



Analyses the percentage of carbon, manganese, phosphorus and sulphur. This analysis shall be 



made from drillings taken at least 1/4 inch beneath the surface of a test ingot obtained 



during the pouring of the melt. The chemical composition thus determined shall be 



reported to the Engineer and shall conform to the requirements specified above. 



Check 5. Analyses of castings may be made by the Engineer from a broken tension or 



Analyses bend test specimen. The phosphorus and sulphur content thus determined shall not 



exceed that specified above, by more than 20 per cent. Drillings for analyses shall be 



taken not less than 1/4 inch beneath the surface. 



PHYSICAL PROPERTIES AND TESTS 



Tension Tests 6. The castings shall conform to the following minimum requirements as to tensile 



properties : 



Tensile Strength Ibs. per sq. inch 60 000 



Yield point Ibs. per sq. inch 0.45 tens. str. 



Elongation in 2 inches per cent. 22. 



Reduction of areas per cent. 30. 



Yield Point 7. The yield point shall be determined by the drop of the beam of the testing mach- 



ine. 



Bend Tests 8. The test specimens shall bend cold through 120 degrees around a one-inch pin, 



without cracking on the outside of the bent portion. 



Test 9. Sufficient test bars, from which the Engineer may select the test specimens re- 



Specimens quired for the tests specified below under "Number of Tests", shall be attached to cast- 



ings weighing 500 Ibs. or over, when the design of the castings will permit. If the cast- 

 ings weigh less than 500 Ibs., or are of such a design that test bars cannot be attached, 

 two test bars shall be cast to represent each melt. 



10. Test bars shall be annealed with the castings they represent. 



11. The Contractor and Engineer shall agree whether test bars can be attached to 

 castings, on the location of the bars on the castings, on the castings to which bars are 

 to be attached, and on the method of casting unattached bars. 



12. Tension test specimens shall conform to the dimensions shown in Fig. 1. The 

 ends shall be of a form to fit the holders of the testing machine in such a way that the 

 load shall be axial. 



