(english) A steel making method using an acid refractory-lined (usually silica) furnace. Neither sulfur or phosphorus is removed. ภาษาไทย ภาษาอังกฤษ Acid Process 2 0 0 ภาพประกอบ (english) A steel making method using an acid refractory-lined (usually silica) furnace. Neither sulfur or phosphorus is removed.