Industry Overview
Ductile iron casting is a process in which magnesium or cerium is added to molten cast iron to transform graphite from a laminar form into spheroidal nodules. First manufactured by K.D. Mills in 1943, ductile iron combines the processing advantages of grey iron, including low melting point, good fluidity, castability and machinability, with engineering properties associated with steel, such as high strength, ductility and wear resistance.
The near-spherical graphite nodules improve ductility, impact resistance, tensile strength and yield strength while reducing volumetric shrinkage compared with steel. This can reduce the need for feeders and melting energy and, in suitable applications, eliminate heat treatment. Different ductile iron grades are obtained through variations in ferrite and pearlite matrix structures, alloying additions and, where required, heat treatment.
Ductile iron castings range from a few grams to a hundred tons or more and are used in automobile safety components, pumps, machine tools, hydraulic components, pressure containers, pipe fittings and manhole covers. They are also replacing forged and fabricated steel components because of their combination of mechanical performance and economical production. Ferritic, pearlitic and ferritic-pearlitic grades provide different balances of strength, ductility, toughness, wear resistance and machinability, making ductile iron a versatile engineering and construction material.
Cost Estimation
| Particulars | Value |
|---|---|
| Plant Capacity | 40 MT/Day |
| Land & Building (10000 sq.mt) | Rs. 7.75 Cr |
| Plant & Machinery | Rs. 5.15 Cr |
| Working Capital for 2 Months | Rs. 11.21 Cr |
| Total Capital Investment | Rs. 24.85 Cr |
| Rate of Return | 23% |
| Break Even Point | 67% |
Content Index
- INTRODUCTION
- COMPOSITION OF DUCTILE IRON CASTINGS
- DUCTILE IRON
- FIG 1 TYPICAL MICRO STRUCTURE OF DUCTILE IRON
- COMPOSITION:
- COMMON DUCTILE IRON GRADES
- THE FAMILY OF DUCTILE IRON
- PROPERTIES OF DUCTILE IRONS
- BENEFITS OF DUCTILE IRON
- (A) DI MAN HOLE COVER
- GRADES
- 1. LIGHT DUTY (LD-2.5) SQUIRE, CIRCULAR OR REACTANGULAR SOLID TYPE
- 2. MEDIUM DUTY (MD-10) CIRCULAR, SQUIRE OR REACTANGULAR (SCRAPPER MAN HOLE)
- 3. HEAVY DUTY (HD 20) CIRCULAR, SQUIRE OR REACTANGULAR (SCRAPPER MAN HOLE)
- 4. EXTRA HEAVY DUTY (EHD 35) CIRCULAR, SQUIRE ORREACTANGULAR (SCRAPPER MAN HOLE)
- (B) DI PIPE FITTING
- TYPES OF D.I FITTING
- (1) PIPE ADAPTERS
- TYPES OF PIPE ADAPTERS:
- LOCKING PIPE ADAPTER:
- OFFSET PIPE ADAPTER:
- MALE ADAPTER:
- FEMALE PIPE ADAPTER:
- STRAIGHT THREAD ADAPTERS:
- (2) PIPE ELBOW FITTINGS
- (3) PIPE COUPLING
- PARTS OF PIPE COUPLING AS SHOWN BELOW:
- (4) PIPE UNION
- (5) PIPE REDUCER
- (6) PIPE TEE
- SIZE OF PIPE FITTING
- SIZES OF BEND PIPES
- DOUBLE SOCKET BEND
- DOUBLE FLANGED BEND
- DOUBLE FLANGED 90° LONG RADIUS BEND
- DOUBLE FLANGED 90° DUCKFOOT BEND
- DUCTILE IRON FITTINGS
- SIZES OF PIPE TEE
- ALL SOCKET TEE
- ALL FLANGED TEE
- ALL FLANGED 45° ANGLE BRANCHES
- ALL FLANGED RADIAL TEES
- ALL FLANGED 'Y' TEES
- DOUBLE SOCKET LEVEL INVERT TEE WITH FLANGED BRANCH
- DOUBLE SOCKET TEE WITH FLANGED BRANCH
- DOUBLE SOCKET TAPER
- SIZES OF TAPER (REDUCER)
- DOUBLE SOCKET TAPER
- DOUBLE FLANGED TAPER
- DUCTILE IRON COLLAR
- SIZES OF SHORT PIPES
- DUCTILE IRON FLANGE
- FLANGED PIPE
- DOUBLE FLANGED PIPES
- FLANGED SPIGOT
- FLANGED SOCKET
- DUCTILE IRON FITTINGS
- DOUBLE SOCKET BEND
- SIZES OF ADAPTORS
- FLANGE ADAPTOR
- DISMANTLING ADAPTOR
- FLEXIBLE COUPLING
- DIMENSIONS OF FLANGE
- USES AND APPLICATION
- B.I.S. SPECIFICATION
- PROCESS FLOW CHART
- MANUFACTURING PROCESS
- (A) FOR MAN HOLE COVER
- RAW MATERIALS
- DESIGN
- THE MANUFACTURING
- PROCESS
- PATTERN MAKING
- MOLD PREPARATION
- MELTING/POURING
- THE MANUFACTURING OF A MANHOLE COVERS USING A SAND MOLD.
- COOLING
- FINISHING
- QUALITY CONTROL (PLEASE REFER IS: 1726:1991)
- 1. COATING
- MARKING
- (B) FOR DI PIPE FITTING
- MANUFACTURING PROCESS
- SUB PROCESS
- DESULPHURIZATION
- SCRAP ADDITION & SUPER HEATING
- MAGNESIUM TREATMENT
- LOST FOAM CASTING
- PROCESS DESCRIPTION
- ADVANTAGES
- HEAT TREATMENT
- ZINC COATING
- HYDROSTATIC PRESSURE TESTING
- CEMENT LINING
- STEAM CURING
- BITUMEN COATING
- MARKING AND STENCILING
- QUALITY CONTROL (PLEASE REFER IS: 9523:2000)
- RAW MATERIAL
- INDUCTION FURNACE
- LADLE TREATMENT/CONVERTER FOR "MG" TREATMENT
- CASTING MACHINE
- GANTRY BEFORE ANNEALING FURNACE
- ANNEALING FURNACE
- SAMPLE CUTTING
- ZINC COATING
- GROOVE GRINDING
- HYDROSTATIC PRESSURE TESTING
- CEMENT LINING
- CEMENT CURING
- BITUMEN COATING
- MARKET OVERVIEW OF MANHOLE COVERS
- INDUSTRY ANALYSIS
- PREFERENCE OF PIPE MATERIALS
- INTER LINKING OF RIVERS (ILR) PROJECT
- EXPORT POTENTIAL
- DOMESTIC MANUFACTURERS OF DI PIPE
- DEMAND – SUPPLY GAP:
- ECONOMIC GROWTH
- DEMAND FOR WATER
- URBANIZATION
- DEMAND ANALYSIS FOR DI PIPES
- INVESTMENT IN WATER PROJECTS AND ROLE OF GOVERNMENT BODIES
- EXTERNAL AID
- EXPORT OF DI PIPE FITTINGS
- IMPORT OF DI PIPE FITTINGS
- EXPORT OF DUCTILE IRON MANHOLE
- IMPORT OF DUCTILE IRON MANHOLE
- PLANT LAYOUT
- MANUFACTURERS/SUPPLIERS OF DI MAN HOLE COVER
- MANUFACTURERS/SUPPLIERS OF DI PIPE FITTING
- SUPPLIERS OF RAW MATERIALS
- SUPPLIERS OF PIG IRON
- SUPPLIERS OF CAST IRON SCRAP
- SUPPLIERS OF STEEL SCRAP
- SUPPLIERS OF SILICON CARBIDE
- SUPPLIERS OF FERRO SILICON
- SUPPLIERS OF MAGNESIUM INGOT
- SUPPLIERS OF FERRO SILICON
- SUPPLIERS OF BENTONITE
- SUPPLIERS OF GRAPHITE POWDER
- SUPPLIERS OF SILICA SAND
- SUPPLIERS OF LIME STONE
- SUPPLIERS OF PLANT AND MACHINERIES
- SUPPLIERS OF ANNEALING FURNACE
- SUPPLIERS OF HEATREATMENT FURNACE
- SUPPLIERS OF INDUCTION FURNACE
- SUPPLIERS OF ALUMINIUM PATTERNS
- SUPPLIERS OF INTENSIVE SAND MIXTURE AND MULLER
- SUPPLIERS OF SAND SIEVING MACHINE
- SUPPLIERS OF SQUEEZE MOLDING MACHINE
- SUPPLIERS OF SHAKEOUT MACHINE
- SUPPLIERS OF CORE SHOOTER MACHINE
- SUPPLIERS OF DRYING OVEN
- SUPPLIERS OF FOUNDRY TOOLS
- SUPPLIERS OF MOLDING BOXES
- SUPPLIERS OF METAL TESTING MACHINE
- SUPPLIERS OF PRECISION MEASURING TOOLS
- SUPPLIERS OF PRECISION MEASURING TOOLS
- SUPPLIERS OF NDT INSPECTION EQUIPMENT
- SUPPLIERS OF DRILLING, LATHE, TAPING MACHINES
- SUPPLIERS OF GRINDING MACHINE
- SUPPLIERS OF EOT CRANE
- SUPPLIERS OF POWER TRANSFORMERS
- SUPPLIERS OF ELECTRICAL PANEL
- SUPPLIERS OF ELECTRIC MOTOR
- SUPPLIERS OF COOLING TOWER
- SUPPLIERS OF EFFLUENT TREATMENT PLANT (ETP PLANT)
- SUPPLIERS OF AIR POLLUTION CONTROL EQUIPMENTS
- SUPPLIERS OF AIR CONDITIONING EQUIPMENTS
- SUPPLIERS OF AIR COMPRESSORS
- SUPPLIERS OF PLATFORM WEIGHING MACHINE
- SUPPLIERS OF MATERIAL HANDLING EQUIPMENTS
- SUPPLIERS OF FIRE FIGHTING EQUIPMENTS
- SUPPLIERS OF SHOT BLASTING MACHINE
- SUPPLIERS OF JIGS AND FIXTURE
- SUPPLIERS OF SUBMERSIBLE WATER PUMP
Appendix
- 01. PLANT ECONOMICS
- 02. LAND & BUILDING
- 03. PLANT AND MACHINERY
- 04. OTHER FIXED ASSESTS
- 05. FIXED CAPITAL
- 06. RAW MATERIAL
- 07. SALARY AND WAGES
- 08. UTILITIES AND OVERHEADS
- 09. TOTAL WORKING CAPITAL
- 10. TOTAL CAPITAL INVESTMENT
- 11. COST OF PRODUCTION
- 12. TURN OVER/ANNUM
- 13. BREAK EVEN POINT
- 14. RESOURCES FOR FINANCE
- 15. INSTALMENT PAYABLE IN 5 YEARS
- 16. DEPRECIATION CHART FOR 5 YEARS
- 17. PROFIT ANALYSIS FOR 5 YEARS
- 18. PROJECTED BALANCE SHEET FOR (5 YEARS)
Frequently Asked Questions
Ductile iron casting is a foundry process that produces castings with spheroidal graphite nodules in an iron matrix. Magnesium or cerium is added to molten cast iron to change the graphite morphology from flakes to substantially spherical nodules. This structure provides a useful combination of strength, ductility, toughness, wear resistance and machinability. Ductile iron can therefore be used for components where conventional grey cast iron may not provide sufficient mechanical performance, while retaining several casting and production advantages.
Magnesium is added primarily to promote the formation of spheroidal graphite in molten cast iron. This nodular graphite structure interrupts crack propagation more effectively than the flake graphite found in conventional grey iron. As a result, the casting can achieve substantially improved ductility, impact resistance and strength. The treatment must be carefully controlled because the effectiveness of nodulization depends on factors such as melt chemistry, treatment practice, temperature and subsequent solidification conditions.
Ductile iron grades are differentiated mainly by their matrix structure and resulting mechanical properties. Ferritic ductile iron emphasizes ductility and low-temperature toughness, while pearlitic ductile iron provides higher strength and wear resistance with moderate ductility. Ferritic-pearlitic grades combine the characteristics of both structures and are widely used where a balanced combination of strength, ductility and machinability is required. Alloying additions and heat treatment can also be used in suitable applications to obtain the required performance.
Ductile iron castings are used for automobile components, pumps, machine tools, hydraulic components, pressure-related parts, pipe fittings and manhole covers. Their combination of strength, toughness, ductility and wear resistance also allows them to replace selected forged, fabricated and cast steel components. Applications can range from relatively small engineered parts to very large castings, with the appropriate grade and manufacturing process selected according to the required mechanical properties, dimensions and service conditions.
The manufacturing process generally involves preparing raw materials, melting the iron, treating the molten metal for graphite nodulization, preparing molds, pouring, solidification, cooling and finishing. Depending on the product, additional operations may include heat treatment, machining, coating, cement lining or pressure testing. Quality control is required throughout the process to maintain the required chemical composition, graphite morphology, microstructure, dimensions and mechanical performance of the finished casting.
Ductile iron generally offers significantly greater ductility and toughness than conventional grey cast iron while retaining important casting advantages. Its spheroidal graphite structure improves resistance to crack formation and supports higher tensile and yield strength. Ductile iron can also provide good machinability, wear resistance and economical production. Its lower volumetric shrinkage compared with steel can reduce feeding requirements, while suitable as-cast grades may avoid additional heat treatment, helping to control manufacturing costs.
Ductile iron is widely suited to pipes and fittings because it combines mechanical strength, toughness, durability and castability. These properties allow manufacturers to produce components in a range of shapes and sizes for demanding applications. Ductile iron pipe systems can incorporate fittings such as bends, tees, reducers, adapters, couplings and flanges. Depending on service requirements, products may also receive treatments such as zinc coating, cement lining, bitumen coating and other finishing operations, together with appropriate testing and quality control.
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