45 



Process 

 Discard 



Chemical 

 Composition 



Ladle 

 Analyses 



Check 

 Analyses 



Tension 

 Tests 



Yield Point 



Mod ifica t ion s 

 in Elongation 



SPECIFICATION FOR STRUCTURAL NICKEL STEEL 



(In substantial agreement with A.S.T.M. Specification A 8-21) 



MANUFACTURE 



1. The steel shall be made by the open-hearth process. 



2. A sufficient discard shall be made from each ingot to secure freedom from 

 injurious piping and undue segregation. 



CHEMICAL PROPERTIES AND TESTS 



3. The steel shall conform to the following requirements as to chemical composition: 



Structural Steel 



Carbon not over 0.45 



Manganese " 0.70 



Phosphorus/ Acid " " 0.05 



\Basic " " 0.04 



Sulphur ' 0.05 



Nickel . . not under 3.25 



Rivet Steel 

 not over 0.30 per cent 



" 0.60 " " 

 n 004 <i ii 



" 0.03 " " 



" 0.045 " " 



not under 3.25 " " 



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

 the percentages of the elements specified above. This analysis shall be made from a 

 test ingot taken during the pouring of the melt. The chemical composition thus deter- 

 mined shall be reported to the Engineer and shall conform to the requirements specified 

 above. 



5. Analyses may be made by the Engineer from finished material representing each 

 melt. The chemical composition thus determined shall conform to the requirements 

 specified above. 



PHYSICAL PROPERTIES AND TESTS 



6. The material shall conform to the following requirements as to tensile properties 

 except as modified hereinafter: 



7. Tests of annealed specimens of eyebar flats shall be made for information only. 



8. In the case of pins and rollers, whether annealed or unannealed, the elongation 

 shall be measured in 2 inches. 



9. The yield point shall be determined by the drop of the beam of the testing mach- 



ine. 



10. For plates, shapes, and unannealed bars over 1 inch in thickness, a deduction 

 of 0.25 from the percentage of elongation specified under "Tension Tests" above shall 

 be made for each increase of 1/32 inch in thickness above 1 inch, to a minimum of 14 

 per cent. 



