FERRITIC CAST IRON HAVING SPHEROIDAL GRAPHITE

Abstract

The invention relates to ferritic cast iron comprising spheroidal graphite, containing, in % by mass, from 3.4 to 3.8% of carbon (C) from 1.5 to 2.1% of silicon (Si) not more than 0.25% of manganese (Mn) not more than 0.05% of sulfur (S) up to 0.6% of usual accompanying elements balance iron (Fe)

In order to achieve a notched impact energy of at least 20 J at a temperature of 10 C. in the case of such a ferritic cast iron comprising spheroidal graphite, the invention proposes that the accompanying elements chromium (Cr), vanadium (V), niobium (Nb) and titanium (Ti) in total be limited to 0.05% by mass. This results in a graphite nodule count of less than or equal to 160/mm.sup.2 in this cast iron. The invention further relates to the use of such a cast iron for cold-sensitive components, in particular in ships or wind power plants.

Claims

1. A ferritic cast iron comprising spheroidal graphite, containing, in % by mass, from 3.4 to 3.8% of carbon (C) from 1.5 to 2.1% of silicon (Si) not more than 0.25% of manganese (Mn) not more than 0.05% of sulfur (S) not more than 0.6% of usual accompanying elements balance iron (Fe) wherein the accompanying elements chromium (Cr), vanadium (V), niobium (Nb) and titanium (Ti) in total are limited to 0.05% by mass.

2. The use of ferritic cast iron as claimed in claim 1 for cold-sensitive components.

3. The use of ferritic cast iron as claimed in claim 2 in ships or wind power plants.

Description

EXAMPLE 1

[0019] Ferritic cast iron comprising spheroidal graphite and having the following composition:

TABLE-US-00001 Carbon (C) 3.600% Silicon (Si) 1.530% Manganese (Mn) 0.198% Sulfur (S) 0.007% Phosphorus (P) 0.010% Magnesium (Mg) 0.052% Nickel (Ni) 0.359% Molybdenum (Mo) 0.001% Copper (Cu) 0.010% Aluminum (Al) 0.014% Zirconium (Zr) 0.005% Antimony (Sb) 0.001% Tin (Sn) 0.001% Lead (Pb) 0.001% Cerium (Ce) 0.001% Bismuth (Bi) 0.001% Tellurium (Te) 0.002% Chromium (Cr) 0.028% Titanium (Ti) 0.003% Vanadium (V) 0.002% Niobium (Nb) 0.001% Balance iron (Fe)

[0020] In the case of such a composition, a graphite nodule count of 160/mm.sup.2 and a notched impact energy of more than 20 J at a temperature of 10 C. are established in the ferritic cast iron produced in this way.

EXAMPLE 2

[0021] Ferritic cast iron comprising spheroidal graphite and having the following composition:

TABLE-US-00002 Carbon (C) 3.580% Silicon (Si) 1.600% Manganese (Mn) 0.124% Sulfur (S) 0.007% Phosphorus (P) 0.011% Magnesium (Mg) 0.060% Nickel (Ni) 0.208% Molybdenum (Mo) 0.001% Copper (Cu) 0.011% Aluminum (Al) 0.012% Zirconium (Zr) 0.005% Antimony (Sb) 0.001% Tin (Sn) 0.001% Lead (Pb) 0.001% Cerium (Ce) 0.003% Bismuth (Bi) 0.002% Tellurium (Te) 0.002% Chromium (Cr) 0.015% Titanium (Ti) 0.003% Vanadium (V) 0.002% Niobium (Nb) 0.002% Balance iron (Fe)

[0022] In the case of such a composition, a graphite nodule count of 130/mm.sup.2 and a notched impact energy of more than 20 J at a temperature of 10 C. are established in the ferritic cast iron produced in this way,

EXAMPLE 3

[0023] Ferritic cast iron comprising spheroidal graphite and having the following composition:

TABLE-US-00003 Carbon (C) 3.550% Silicon (Si) 1.600% Manganese (Mn) 0.202% Sulfur (S) 0.006% Phosphorus (P) 0.014% Magnesium (Mg) 0.034% Nickel (Ni) 0.436% Molybdenum (Mo) 0.001% Copper (Cu) 0.004% Aluminum (Al) 0.014% Zirconium (Zr) 0.006% Antimony (Sb) 0.001% Tin (Sn) 0.001% Lead (Pb) 0.001% Cerium (Ce) 0.006% Bismuth (Bi) 0.002% Tellurium (Te) 0.002% Chromium (Cr) 0.011% Titanium (Ti) 0.004% Vanadium (V) 0.002% Niobium (Nb) 0.003% Balance iron (Fe)

[0024] In the case of such a composition, a graphite nodule count of 110/mm.sup.2 and a notched impact energy of more than 20 J at a temperature of 10 C. are established in the ferritic cast iron produced in this way.