SPECIFICATIONS 



Test Pieces. 



Annealed Test 

 Pieces. 



Marking. 



Physical 

 Properties. 



Rivet SteeL 



Soft SteeL 



Medium SteeL 



Full Size Test of 

 Steel Eye-Bars. 



No work shall be done on any steel between the tempera- 

 ture of boiling water and of ignition of hard wood saw dust. 



1 14. The tensile strength, limit of elasticity and ductility, 

 shall be determined from a standard test-piece, cut from the 

 finished material, of at least ^2 square inch section. All brok- 

 en samples must show a silky fracture of uniform color. 



115. Material which is to be used without annealing or 

 further treatment is to be tested in the condition in which it 

 comes from the rolls. When material is to be annealed or 

 otherwise treated before use, the specimen representing such 

 material is to be similarly treated before testing. 



1 1 6. Every finished piece of steel shall be stamped with 

 the blow number identifying the melt. 



117. Steel shall be of three grades: Rivet, Soft and 

 Medium. 



118. Rivet steel shall have: Ultimate strength, 50,000 

 to 58,000 pounds per square inch. Elastic limit, not less than 

 one-half the ultimate strength. Elongation, 26 per cent in 8 

 inches. Bending test, after or before heating to a light cherry 

 red and cooling in water, 180 degrees flat on itself, without 

 fracture on outside of bent portion. 



'119. Soft steel shall have: Ultimate strength, 54,000 

 to 62,000 pounds per square inch. Elastic limit, not less than 

 one-half the ultimate strength. Elongation, 25 per cent in 8 

 inches. Bending test, after or before heating to a light cherry 

 red and cooling in water, 180 degrees flat on itself, without 

 fracture on outside of bent portion. 



1 20. Medium steel shall have: Ultimate strength, 60,000 

 to 68,000 pounds per square inch. Elastic limit, not less than 

 one-half the ultimate strength. Elongation, 22 per cent in 8 

 inches. Bending test, 180 degrees to a diameter equal to 

 thickness of piece tested, without fracture on outside of bent 

 portion. 



121. Full size test of steel eye-bars shall be required to 

 show not less than 10 per cent elongation in the body of the 

 bar, and tensile strength not more than 5,000 pounds below 

 the minimum tensile strength required in specimen tests of the 

 grade of steel from which they are rolled. The bars will be 

 required to break in the body, but should a bar break in the 



