News Center
31
2022
-
01
What are the main properties of ductile iron?
What are the main properties of ductile iron? Ductile iron castings have been used in almost all major industrial sectors that require strength, plasticity, toughness, wear resistance, abrasion resistance, severe thermal and mechanical shock, high or low temperature, corrosion resistance, dimensional stability, etc. In order to meet this variation in service conditions, there are many trademarks of ink cast iron, providing a wide range of mechanical and physical properties.
What are the main working performance problems of ductile iron?
Ductile iron castings have been applied to almost all industrial management departments where we need strength, plasticity, toughness, wear resistance, abrasion resistance, severe thermal and mechanical shock, high or low temperature, corrosion resistance, dimensional stability, etc. To meet these varying conditions of use, ductile iron has many trademarks, providing a wide range of mechanical and physical properties.
Most ductile iron castings specified by the international logistics standardization organization ISO1083 are mainly produced in a non-alloyed state. Obviously, this range includes high-strength grades with tensile strengths greater than 800 N/mm2 and elongation of 2%. Another is the high-plastic grade with an elongation of more than 17% and a low strength (at least 370 N/square mm). Strength and elongation are not the basis for designers to choose materials. Other key properties include yield strength, modulus of elasticity, wear and fatigue strength, hardness, and impact strength.
Pearlitic ductile iron has the advantages of good strength, moderate toughness, plasticity, comprehensive technical performance, wear resistance, vibration damping, and casting process performance. Its performance can be changed by various heat treatments. It is mainly used for various power engineering machinery such as crankshafts, camshafts, connecting shafts, connecting rods, gears, clutch housings, hydraulic cylinder blocks and other parts.
What are the safety precautions for ductile iron?
(1) Strictly control the chemical composition. The carbon and silicon content required for the original molten iron is significantly higher than that of gray cast iron, and the content of manganese, phosphorus, and sulfur in ductile iron is reduced.
(2) The iron temperature is higher than that of gray cast iron to compensate for spheroidization and to compensate for the loss of iron liquid temperature during inoculation treatment.
(3) Spheroidizing treatment, that is, adding spheroidizing agent to the iron liquid.
(4) Add inoculant for inoculation treatment.
(5) Old ink cast iron has low fluidity and large shrinkage, so it is necessary to reasonably apply high pouring temperature and large pouring system size, riser, chill, and compliance principles.
(6) Heat treatment.
Annealing. Obtain ferrite gas, improve plasticity and toughness, eliminate stress, and improve cutting performance.
Positive fire. Obtain perlite gas to improve strength and wear resistance.
Quenching and tempering. The matrix structure and comprehensive mechanical properties of tempered sorbite can be obtained, such as spindles, crankshafts, connecting rods, etc.
Isothermal quenching. For parts with complex shapes and requiring comprehensive performance, it can ensure the matrix structure of Harvet body and comprehensive mechanical properties such as high strength, high hardness, and toughness, and prevent cracking of spindles, crankshafts, gears, etc. during heat treatment.
What are the main problems with ductile iron?
Due to the characteristics of dough solidification of ductile iron, the produced cast iron often has defects such as shrinkage holes and shrinkage due to poor shrinkage. In order to predict this defect situation before casting production, numerical analogy of the casting process has been carried out at home and abroad in the Indian era. The numerical analogy of the casting process adopts numerical analogy technology to simulate the formation process of actual castings in a computer virtual environment. Determine the filling process of metal liquid, the cooling and solidification process, the stress formation process, and the influence degree of main elements in the forming process. The organization, performance and possible defects are predicted, providing a basis for process optimization to reduce waste products.
Ductile iron
Previous Page
Next Page
Previous Page
Next Page
Shandong Gongchen Machinery Technology Co., Ltd.
Contact QQ: 258506508
Mobile Number:15621618888
Phone:0536-7691368 7691229
Fax: 0536-7691229
Contact Email:guisongzhng8@gmail.com
Website:www.shandonggongchen.com Gongchen.China Valve Castings.China
Address: Mucun Town, Fangzi District, Weifang City, Shandong Province
Public Account