| 摘要 |
PROBLEM TO BE SOLVED: To provide a tungsten stock for secondary working small in the anxiety of being increased in brittleness even in the case of being fed to a secondary working stage such as coiling, small in disconnection and breakage and having excellent durability even in the case bending, compression, twisting, tensile stress or the like is acted in the secondary working stage and capable of remarkably improving the yield in the secondary working. SOLUTION: In a tungsten stock 1 for secondary working essentially consisting of tungsten (W) and worked into a product through a secondary working stage such as coiling, the average spacing (Sm) of the ruggedness of a roughness curve in the case the 1/3 of the diameter D of the tungsten stock 1 is defined as a standard length L is√D/5 or more, and also, the spacing (Ry) between the crest line and bottom line of the roughness curve is D/50 or less.
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