CORRUGATED BAR COMPANY, INC. 



MANUFACTURERS' STANDARD SPECIFICATIONS FOR 



DEFORMED CONCRETE REINFORCEMENT BARS 



ROLLED FROM BILLETS 



REVISED APRIL 21, 1914 



Manufacture. Steel may be made by either the open-hearth or Bessemer process. 

 Bars shall be rolled from standard new billets. 



Chemical and Physical Properties. The chemical and physical properties 

 shall conform to the following limits: 



Properties Considered 



Phosphorus, maximum, 



Bessemer 



Open-hearth .... 



Ultimate tensile strength, lb. per sq. in. . 



Yield point, minimum, lb. per sq. in. . . 



Elongation, per cent in 8-in., minimum 



Gold Bend without Fracture: 



Bars under ^-in. in diameter or thickness 



Bars %-in. in diameter or thickness and 

 over 



The intermediate and hard grades will be used only when specified. 



Chemical Determinations. In order to determine if the material conforms to 

 the chemical limitations prescribed in the preceding tables, analysis shall be made by 

 the manufacturer from a test ingot taken at the time of the poiu-ing of each melt or 

 blow of steel, and a correct copy of such analysis shall be furnished to the engineer or 

 his inspector. 



Yield Point. For the purposes of these specifications, the yield point shall be 

 determined by careful observation of the drop of the beam of the testing machine, or 

 by other equally accurate method. 



Form of Specimens. Tensile and bending test specimens may be cut from 

 the bars as rolled, but tensile and bending test specimens of deformed bars may 

 be planed or turned for a length of at least nine inches if deemed necessary by the 

 manufacturer in order to obtain uniform cross-section. 



Number of Tests, (a) — At least one tensile and one bending test shall be made 

 from each melt of open-hearth steel rolled, and from each blow or lot of ten tons of 

 Bessemer steel rolled. In case bars differing ^-inch and more in diameter or thick- 

 ness are rolled from one melt or blow, a test shall be made from the thickest and 

 thinnest material rolled. Should either of these test specimens develop flaws, or should 

 the tensile test specimen break outside of the middle third of its gauged length, it 

 may be discarded and another test specimen substituted therefor. In case a tensile 

 test specimen does not meet the specifications, an additional test may be made. 



(6) — The bending test may be made by pressure or by light blows. 



188 



