• 鍛錬たんれん

  tempering (metal), annealing, forging

• 錬金術れんきんじゅつ

  alchemy

• 錬金術師れんきんじゅつし

  alchemist

• 錬るねる

  to temper (steel)

• 錬鋼れんこう

  wrought steel

• 錬鉄れんてつ

  wrought iron

• 錬成れんせい

  training, drilling, strengthening

• 精錬せいれん

  refining, refinement, smelting

• 百錬ひゃくれん

  well-tempered, well drilled, well trained

• 精錬所せいれんしょ

  refinery, smelting works

• 百戦錬磨ひゃくせんれんま

  veteran, battle-worn, schooled by adversity in many battles, hard-bitten, rich in experience, very experienced

• 乾式製錬かんしきせいれん

  fire refining

• 自熔製錬じようせいれん

  flash smelting, autogenous smelting

• 自己鍛錬じこたんれん

  self-discipline, self-improvement

• 鋼の錬金術師はがねのれんきんじゅつし

  Fullmetal Alchemist (manga by Hiromu Arakawa; media franchise)