SPRINGS 



125 



CHROME-VANADIUM-STEEL SPRING WIRE, S.A.E. 6150 SPECIFICATIONS 



Generally used for same range of sizes of spring wire as covered by carbon-steel 

 spring wire, and where the higher physicals of the chrome-vanadium-steel wire make 

 its use specially desirable or necessary. 



1. Steel Manufacture 



This steel is to be made according to approved practice by the electric-furnace or 

 open-hearth process. 



2. Chemical Composition 



Carbon 0.45-0.55 Sulphur 0.5 max. 



Manganese 0.50-0.90 Phosphorus 0.04 ma.\. 



Chromium 0.80-1.10 Sihcon 0.15-0.30 



Vanadium 0.15 min. 



3. Physical Properties 



Reduction of area, 48 per cent minimum. Elongation in 8 in., 3}i per cent minimum. Rockwell C, 42-46. 



4. Surface Conditions 



Upon etching with a hot solution of hydrochloric acid sufficiently to disclose 

 surface defects, no seams, hairhne or otherwise, pits, gouges, die marks, or other 

 imperfections shall be revealed. Decarburization must be held to a minimum. 



5. Limits of Variation in Diameter 



Wire diameter 0.1620 in. and less — plus or minus 0.0015 

 Wire diameter 0.177 in. and over — plus or minus 0.002 



6. Inspection, Rejections, and Replacements 



All springs will be rigidly inspected at the plants as received. If more than a 

 total of 10 per cent of the springs on any one purchase order are made of steel that 

 faUs to comply mth the above specifications, or with the specifications on the detail 

 drawing, the entire lot will be rejected. All springs rejected shall be replaced by the 

 seller without further cost to the purchaser. 



