CAMBRIA STEEL. 



393 



MANUFACTURERS' STANDARD SPECIFICATIONS. 



REVISED APRIL 22, 1919 



STRUCTURAL STEEL. 



Orades. 



1. These specifications cover three classes of structural steel, namely: 



Class A steel, to be used for railway bridges and ships. 

 Class B steel, to be used for buildings, highway bridges, train sheds and 

 similar structures. 



Class C steel, to be used for structural rivets. 



I. MANUFACTURE. 

 Process. 



2. Steel for Classes A and C shall be made by the open-hearth process. 

 Steel for Class B may be made either by the open-hearth or by the Bessemer 

 process. 



II. CHEMICAL PROPERTIES AND TESTS. 

 Chemical Composition. 



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

 composition: 



Ladle Analyses. 



4. To determine whether the material conforms, to the requirements 

 specified in section 3, an analysis shall be made by the manufacturer from a 

 test ingot taken during the pouring of each melt. A copy of this analysis 

 shall be given to the purchaser or his representative, if requested. 



Check Analyses. 



5. A check analysis of Class A and Class C steel may be made by the pur- 

 chaser from finished material representing each melt, in which case an excess 

 of 25 per cent, above the requirements specified in section 3 shall be allowed. 



