铸铁件笨重、粗大,若制作轻薄型则容易碎裂,这是因铸铁内石墨呈薄片状分布,薄片部位会产生裂纹所致。因此,这是铸件行业的一大难题。几年前国外曾有人研制成一种致密石墨铸铁,其结构呈蠕形,其强度比普通铸铁提高0.5～1倍。但由于原料中有镁、钛等,因此很难进行致密石墨铸铁的商业性生产。 Cast iron pieces bulky, thick, thin and easy to make if the production of fragmentation, which is due to the cast iron graphite flake distribution, the cracks will be caused by the sheet parts. Therefore, this is a major problem in the casting industry. A few years ago someone had developed a foreign dense graphite cast iron, its structure was vermicular, its strength than ordinary cast iron to improve 0.5 to 1 times. However, due to the raw materials of magnesium, titanium, etc., it is difficult to carry out commercial production of dense graphite cast iron.