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Home Material Sciences Technology of Obtaining Ductile Iron by Modifying in the Mould

Technology of Obtaining Ductile Iron by Modifying in the Mould

Description

Work up technology to produce machine-building castings (bodies, crankshafts, diaphragms and other) of ductile iron, obtained in mould modifying process.

Advantages of offered technology

  • Elimination of smoke and reaction fumes as undesirable atmospheric conditions;
  • The efficiency of magnesium-containing alloy (7%Mg) is from 80% to 90% or above compared with 30% for ladle process, the inoculating alloy usage is from 0,6% to 0,7% of mass of metals entered the mould;
  • A gating systems design that allows separation of insoluble reaction products before they can enter the mold cavities of castings;
  • In structure thin-section casting free carbides (cementite) are absent;
  • Give a chance for obtaining castings of thickness section up 10-15mm without application feeder heads.

Special grades of ductile iron

ВЧ 600-10

  • Structure of metal base –––––––––––––––––––––– ferrite
  • Mechanical properties: σb, МПа ––––––––––––––– > 600
  • Mechanical properties: δ,% –––––––––––––––––– > 10
  • Mechanical properties: HB ––––––––––––––––––– 179–229
  • Types of castings: –––––––––––––––––––––––––– Bodies

ВЧ 800-3

  • Structure of metal base –––––––––––––––––––––– pearlite
  • Mechanical properties: σb, МПа ––––––––––––––– > 800
  • Mechanical properties: δ,% ––––––––––––––––––– > 3
  • Mechanical properties: HB ––––––––––––––––––– 241–302
  • Types of castings: –––––––––––––––––––––––––– Crankshafts

ВЧ 900-5

  • Structure of metal base –––––––––––––––––––––– beinite
  • Mechanical properties: σb, МПа ––––––––––––––– > 900
  • Mechanical properties: δ,% ––––––––––––––––––– > 5
  • Mechanical properties: HB –––––––––––––––––––– 269–311
  • Types of castings: –––––––––––––––––––––––––– Diaphragms




Areas of Application

Foundry industry

Contact Details

Organization: Physico-Technological Institute of Metals and Alloys of NASU.
Address: 34/1 Vernadsky Avenue, 03680, Kiev-142, Ukraine.
Tel. (044) 444-35-15.
Fax (044) 459-50-29.
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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