Recipe lists as Velium Conversion Rapier in tradeskill window recipe list (was visible in list at skill level 25).
Velium Conversion Rapier (Trival 15)
1 x Velium Smithy Hammer
1 x Velium Rapier
Returns:
1 x Small Brick of Velium
1 x Small Piece of Velium
1 x Velium Smithy Hammer
Believe the recipe is no fail as at skill 25, failed zero times out of 20 attempts for conversion