Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C1/00—Refining of pig-iron; Cast iron
  • C21C1/10—Making spheroidal graphite cast-iron
  • C21C1/105—Nodularising additive agents
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C1/00—Refining of pig-iron; Cast iron
  • C21C1/10—Making spheroidal graphite cast-iron

Definitions

• the present invention relates to the sphere of alloys intended for improving cast iron, including the inoculation of grey or spheroidal cast irons with an'alloy having the following composition:
• the present invention relates to alloys intended for improving cast iron.
• the variation in mechanical characteristics, as a function of the chemical composition of a lamellar grey iron, is well known.
• the composition of the cast iron is generally expressed by its equivalent carbon and it is, for example, known that the tensile strength increases with decrease in carbon equivalent.
• inoculating alloys is not limited to grey cast iron and that such alloys used on spheroidal graphite cast iron permit the improvement in such characteristics as:
• ferro-silicons of different grades are among the inoculating alloys which are most frequently employed in the practice of inoculation.
• the object of the invention is an inoculating alloy of a novel Fe-Si-Ca-C type, which is more effective than ferro-silicons to which carbon or calcium has been added.
• the alloy of this invention contains 55 to 85 percent of silicon, 0.2 to 1 percent of carbon, 2 to 5 percent of calcium and up to 2 percentof aluminum, the remainder being iron plus its usual impurities which originate mainly from the initial materials.
• Commercial ferrosilicons are known which contain 1.3 to 1.5 percent of Al, 0 to 0.03 percent of Ti, 0 to 0.20 percent of Mn, 0 to 0.10 percent of Ni, 0 to 0.02 percent of Cr, 0 to 0.003 percent of S, 0 to 0.003 percent of P, 0 to 0.002 percent of Cu.
• the alloy contains to percent of silicon, 0.3 to 0.7 percent of carbon, 2.0 to
• This alloy can be introduced into the cast iron by using the different procedures employed for the inoculation and peculiar to the foundry art.
• Such an alloy can particularly be obtained by a process which consists in adding the carbon to a liquid alloy containing Si and Ca, by the addition of cast iron.
• Example 1 Into a synthesis induction furnace are introduced 12 kg of an SiCa alloy (Ca 31.8 percent) and kg of industrial silicon (Si 97.7 percent); When the metal is liquid, 20 kg of small pieces of a hypereutectic cast iron titrating 5.6 percent of carbon are added. When the iron is dissolved, it is quickly poured. The product which is obtained contains:
• Example 3 Graphite in grain form 0.3 percent by ht In a ladle containing 607 kg of an industrial alloy in the liquid state and having the composition of: Si h percent Fe-S' IS the same that Tests I and 90.1 percent, Ca 2.8 percent, AI 1.22 percent, the 5 balance being iron and impurities, there are dissolved, Test 1 as before, 120 kg of a cast iron containing 3.14 percent Th d H d h h C and 2.3 percent Si. When the iron is dissolvedin the ls :7 a 91% f gi t e starting alloy, it is quickly poured. The product which "39? w cum: 6 m ca mm an as t e comis obtained contains:
• test IV representing the practice of this invention, gives the best results.
• E.L. e1astic limit (kg/mm?)
• R tensile strength (kg/mini).
• E, percent elongation percent.
• the variation is different from that which it would have been possible to allow for when the effects of the carbon and calcium are added separately.
• the carbon and the calcium by themselves lead to a reduction in the tensile strength, whereas their presence together in the alloy results in an improvement in this characteristic.
• Example 5 The products of tests l, II and IV of Example 4 are used this time for inoculating, for comparison purposes, a spheroidal graphite cast iron containing C 3.9 percent and Si 1.3 percent. It is known that the introduction of graphite, as in the tests HA and "B of. the preceding example, is not recommended with this type of cast iron. After nodulization treatment with a magnesium alloy, the spheroidal graphite iron is inoculated, for comparison purposes, with the three products I, II and IV, all three being used in the amount of inoculation temperature: 1460 5 C pouring temperature of the elements: 1420 5 C The compared results are set out in Table III.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
• Micro-Organisms Or Cultivation Processes Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9059094

Family Applications (1)

Country Status (17)

Cited By (8)

Families Citing this family (6)

Citations (9)

• 1970
  • 1970-07-23 FR FR7027144A patent/FR2109058A5/fr not_active Expired
• 1971
  • 1971-07-19 US US00164031A patent/US3765875A/en not_active Expired - Lifetime
  • 1971-07-21 DE DE2136508A patent/DE2136508C3/de not_active Expired
  • 1971-07-21 SE SE7109384A patent/SE387371B/xx unknown
  • 1971-07-21 IT IT51795/71A patent/IT939330B/it active
  • 1971-07-21 GB GB1301238D patent/GB1301238A/en not_active Expired
  • 1971-07-22 AT AT638871A patent/AT312647B/de not_active IP Right Cessation
  • 1971-07-22 ES ES393532A patent/ES393532A1/es not_active Expired
  • 1971-07-22 NL NLAANVRAGE7110105,A patent/NL172344C/xx not_active IP Right Cessation
  • 1971-07-22 IL IL37366A patent/IL37366A/xx unknown
  • 1971-07-22 CH CH1081771A patent/CH526637A/fr not_active IP Right Cessation
  • 1971-07-22 NO NO02791/71A patent/NO127979B/no unknown
  • 1971-07-22 BE BE770336A patent/BE770336A/fr not_active IP Right Cessation
  • 1971-07-22 LU LU63594D patent/LU63594A1/xx unknown
  • 1971-07-22 JP JP5490571A patent/JPS5411243B1/ja active Pending
  • 1971-07-22 CA CA118,893A patent/CA973716A/en not_active Expired
  • 1971-07-23 AU AU31573/71A patent/AU459631B2/en not_active Expired

Patent Citations (9)

Non-Patent Citations (1)

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