Perbandingan pengaruh temperatur dingin ekstrem (cryogenic) terhadap ketangguhan, kekerasan dan struktur mikro pada material SS 304L, SS316L dan aluminium AL 5052 untuk marine loading arm gas alam cair = Comparison of cryogenic temperature effect to the toughness, hardness, and micro structure between material SS304L, material SS316L and material aluminium AL5052 for LNG marine loading arm / Gatong Cahyono