SU502946A1

SU502946A1 - Method for producing nodular cast iron

Info

Publication number: SU502946A1
Application number: SU1632264A
Authority: SU
Inventors: Юрий Николаевич Левченко; Николай Павлович Лыков
Original assignee: Институт Проблем Литья Ан Украинской Сср
Priority date: 1971-03-05
Filing date: 1971-03-05
Publication date: 1976-02-15

Description

1one

Изобретение относитс к литейному производству , в частности к технологии получени высокопрочного чугуна с шаровидным графитом путем модифицировани его магнием или лигатурами, содержащими магний.The invention relates to foundry, in particular, to the technology for producing high-strength nodular cast iron by modifying it with magnesium or ligatures containing magnesium.

Известен способ получени чугуна с шаровидным графитом, по которому чугун подвергаетс обработке магниевой лигатурой, а затем графитизирующей присадкой (ферросилицием или силикокальцием). Однако использование такой графитизирующей присадки не устран ет полностью отбела, особенно при повышенных скорост х охлаждени , что имеет место при изготовлении тонкостенных отливок .A known method for producing nodular cast iron, in which the cast iron is subjected to treatment with a magnesium ligature and then with a graphitizing additive (ferrosilicon or silicocalcium). However, the use of such a graphitizing additive does not completely eliminate chill, especially at higher cooling rates, which occurs in the manufacture of thin-walled castings.

Дл повышени механических свойств чугуна , размельчени шаровидных включений графита, устранени отбела в отливке, а также обеспечени стабильности процесса предлагаетс одновременно с графитизирующей присадкой, в качестве которой используют ферросиликостронций (или силикостронций), вводить в чугун редкоземельные металлы.To improve the mechanical properties of cast iron, crush spherical inclusions of graphite, eliminate chillings in the casting, as well as ensure the stability of the process, it is proposed simultaneously with a graphitizing additive, which uses ferrosilicostrontium (or silicostrontium), to introduce rare earth metals into the cast iron.

Графитизирующую присадку ввод т в чугун в количестве 0,05-1% от веса металла при температуре чугуна 1300-1400°С.The graphitizing additive is introduced into the cast iron in an amount of 0.05-1% by weight of the metal at a cast iron temperature of 1300-1400 ° C.

Claims

1. A method of producing nodular cast iron, including successively modifying it with a magnesium-containing ligature and a graphitizing additive, characterized in that, in order to improve the mechanical properties of the cast iron, crush the graphite spheroidal inclusions and eliminate chill in the cast iron, graphite is injected, and it is applied with graphite, it is used in a graphite, and it is used in a graphite, and it is applied in a graphite, and it is used in a graphite, a graphite is applied, and graphite is used to remove chromium in graphite, and graphite is eliminated by chasing in the cast iron. metals.

2. Method according to l. 1, characterized in that, in order to ensure the stability of the process, ferrosilicostrontium is used as a graphitizing additive and is introduced into iron in an amount of 0.05-1.0% by weight of the metal.