SPECIFICATIONS FOR STEEL CASTINGS. 



611 



I. MANUFACTURE. 



4. Process. The steel may be made by the open-hearth, crucible, or any other process 



approved \>y the pun h.i 



5. Heat Treatment, (a) Class A castings need not be annealed miles-, otherwise specified. 

 (b) ( l.i^ I! i aMiiiijs shall IK- allowed to become cold. They shall then l>e uniformly reheated 



to the proper teiii|HT.iture to refine the grain (a group thus reheated l.< in^ known ass an " annealing 

 chaise "), and allowed to cool uniformly and slowly. If, in the opinion of the purchaser or his 

 itati\e, a casting is not properly annealed, he may at his option require the casting to Ix.- 

 re*aniiealed. 



II. CHEMICAL PROPERTIES AND TESTS. 



6. Chemical Composition. The castings shall conform to the following requirements as to 

 chemical composition: 



CLASS A. CLASS B. 



Carbon not over 0.30 per cent .... 



Phosphorus " ' 0.06 not over 0.05 per cent 



Sulphur ' 0.05 



7. Ladle Analyses. An analysis to determine the percentages of carbon, manganese, phos- 

 phorus and sulphur shall be made by the manufacturer from a test ingot taken during the pouring 

 of each melt, a copy of which shall be given to the purchaser or his representative. This analysis 

 shall conform to the requirements specified in Section 6. Drillings for analysis shall be taken not 

 less than J in. beneath the surface of the test ingot. 



8. Check Analyses, (a) Analyses of Class A castings may be made by the purchaser, in 

 which case an excess of 20 per cent above the requirement as to phosphorus specified in Section 6 

 shall be allowed. Drillings for analysis shall be taken not less than j in. beneath the surface. 



(b) Analyses of Class B castings may be made by the purchaser from a broken tension or 

 bend test specimen, in which case an excess of 20 per cent above the fequirements as to phos- 

 phorus and sulphur specified in Section 6 shall be allowed.. Drillings for analysis shall be taken 

 not less than } in. beneath the surface. 



III. PHYSICAL PROPERTIES AND TESTS. 



(FOR CLASS B CASTINGS ONLY.) 



9. Tension Tests, (a) The castings shall conform to the following minimum requirements 

 as to tensile properties: 



HARD. 



Tensile strength, Ib. per sq. in 80 ooo 



Yield point, Ib. per sq. in 36 ooo 



Elongation in 2 in., per cent 15 



Reduction of area, " 20 



MEDIUM. 

 70 ooo 



31 500 

 18 



25 



SOFT. 

 60 OOO 

 27 ooo 



22 

 30 



1 (b) The yield point shall be determined by the drop of the beam of the testing machine. 



10. Bend Tests, (a) The test specimen for soft castings shall bend cold through 120 deg., 

 and for medium castings through 90 deg., around a I -in. pin, without cracking on the outside of 

 the bent portion. 



(6) Hard castings shall not be subject to bend test requirements. 



11. Alternative Tests to Destruction. In the case of small or unimportant castings, a test to 

 destruction on three castings from a lot may be substituted for the tension and bend tests. This 



test shall show the material to be ductile, free from injurious defects, and suitable for the purpose 

 intended. A lot shall consist of all castings from one melt, in the same annealing charge. 



12. Test Specimens, (a) Sufficient test bars, from which the test specimens required in 

 Section 13 (a) may be selected, shall be attached to castings weighing 500 Ib. or over, when the 



