News Center
02
2021
-
12
What are the main properties of ductile iron?
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.
Main properties of ductile iron:
Ductile iron castings have been applied in almost all major industrial sectors that require strength, plasticity, toughness, wear resistance, abrasion resistance, severe thermal and mechanical shock, high or low temperatures, corrosion resistance, dimensional stability, etc. In order to meet this variation in service conditions, there are many trademarks of ductile ink cast iron, providing a wide range of mechanical and physical properties.
Most ductile iron castings specified by the International Organization for Standardization ISO1083 are mainly produced in non-alloyed condition. Obviously, this range includes high-strength grades with tensile strengths greater than 800 N/mm2 and elongation of 2%. Another is a high plastic grade with an elongation of more than 17% and a low strength (at least 370 N/mm2). Strength and elongation are not the basis for designers to choose materials, other decisive properties include yield strength, modulus of elasticity, wear and fatigue strength, hardness and impact properties. In addition, corrosion resistance, oxidation resistance, and electromagnetic properties may be important to designers. To meet this special use, a set of austenitic ductile iron (usually Ni 1 Resis ductile iron) has been developed. This austenitic ductile iron is mainly alloyed with nickel, chromium and manganese and is incorporated into international standards.
Pearlite ductile iron has the advantages of good second-hand strength, medium toughness, plasticity, comprehensive performance, wear resistance, vibration damping, and casting process performance. Its properties can be changed by various heat treatments. It is mainly used for various power machinery crankshafts, camshafts, connecting shafts, connecting rods, gears, clutch seats, hydraulic cylinder blocks and other parts.
What are the precautions for ductile iron?
(1) Strictly require chemical composition, the carbon and silicon content required for the original molten iron is 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 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) Perform 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 tempered sorbite matrix structure and comprehensive mechanical properties such as spindles, crankshafts, connecting rods, etc. can be obtained.
Isothermal quenching. Parts with complex shapes and requiring comprehensive performance can ensure the matrix structure of the 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.
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