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Malleable Iron vs Cast Iron

Malleable Iron vs Cast Iron  

Difference Between Malleable Iron and Cast Iron


  Malleable Iron Cast Iron
Composition
  • Iron (Fe),
  • 0.1% - 0.3% carbon (C)
  • silicon (Si)
  • manganese (Mn)
  • Iron (Fe)
  • 2% - 4% carbon (C)
  • silicon (Si)
  • sulfur (S)
  • phosphorus (P)
Properties
  • Can be bent or shaped without breaking
  • Stronger and more flexible
  • Breaks easily under stress
  • Good compressive strength
  • Low tensile strength
Surface Finish
  • Smooth finish
  • Suitable for machining and threading
  • Rougher surface due to graphite flakes
Wear Resistance
  • Good wear resistance
  • Good wear resistance
Machinability
  • Good machinability
  • Excellent machinability
Weight
  • Lighter than cast iron
  • Heavier due to higher carbon content
Microstructure
  • Nodular graphite structure, ductile
  • Flake graphite structure, brittle
Uses
  • Pipe fittings
  • Automotive parts
  • Hand tools
  • Engine blocks
  • Manhole covers
  • Heavy machinery parts
Cost
  • more expensive as compare to cast iron
  • Less expensive as compare to Malleable Iron

Find Difference Between Malleable Iron and Carbon Steel Below

Malleable Iron vs Carbon Steel  
  Malleable Iron Carbon Steel
Composition
  • Fe
  • 0.1% - 0.3% (C)
  • Si
  • Mn
  • Fe,
  • C (0.05% - 2.0%)
  • Mn,
  • P
  • S
  • Si
Strength
  • Lower yield and tensile strength compared to carbon steel
  • Higher tensile and yield strength
Microstructure
  • Nodular graphite structure, ductile
  • Crystalline structure
Surface Finish
  • Smooth
  • Suitable for machining and threading
  • Smooth,
  • Suitable for precision applications
Machinability
  • Good
  • Excellent
Hardness
  • Relatively soft
  • Soft to very hard (Varies)
Weldability
  • Welded with precautions due to lower carbon content
  • Easier to weld due to higher carbon content
Corrosion Resistance
  • Moderate,
  • Requires coatings or galvanizing
  • Varies widely
  • May require coatings or stainless additions
Weight
  • Lighter than carbon steels
  • Heavier than malleable iron
Cost
  • More expensive
  • Varies widely based on grade and application

Check Difference Between Malleable Iron and Galvanized Before Buying it

Malleable Iron vs Galvanized  
  Malleable Iron Galvanized
Materials
  • High quality  carbon steel or stainless steel
  • Carbon steel or low alloy steel
Coating
  • No coating is required (material itself has excellent corrosion resistanc)
  • Through galvanizing process, zinc metal is coated on the surface of steel pipe
Composition
  • Cast iron subjected to heat treatment
  • Iron / steel coated with a layer of zinc
Strength
  • Good strength
  • Moderate strength
Ductility
  • Ductile after heat treatment
  • Ductile due to base material; zinc coating
Corrosion Resistance
  • Prone to rust; often coated or painted
  • Excellent corrosion resistance due to zinc coating
Appearance
  • Grayish appearance
  • Shiny, metallic appearance due to zinc coating
Application
  • Agricultural equipment
  • Automotive components
  • Construction
  • Roofing
  • Gutters/ fences
  • Electrical conduit

Refer Malleable Iron Pipe Fittings Specification and ASTM A197 Fitting Equivalent Properties

MI Pipe Fittings Specification



Malleable Fitting Equivalent Properties


Grade JIS Standard ASTM Standard
Malleable Iron G 5702 FCMB 270 A197  
  A47 Class 32510
  FCMB 340 A47M Gr.22010
Cast Iron G 5501 FC 200 A126 Class B
FC 200 A48 Class No.30
G 5501 FC 250 A126 Class C
FC 250 A48 Class No.35
Carbon Steel G 3454 STPG 370 A53 Gr.E-A
A135 Gr.A
STPG 410 A53 Gr.E-B
A135 Gr.B
G 3460 STPL 380 A333 Gr.1
STPL 450 Gr.3
G 3452 SGP A53 Type F
G 3456 STPT 370 A106 Gr.A
  STPT 410 Gr.B
Get Black Malleable Iron Pipe For Gas in Variety of Sizes at Lowest Price in Mumbai, India
Black Malleable Iron Pipe For Gas  

Cast Iron Pipes Size Chart


Size(inch) 2 3 4 5 6 8 10 12 15
Nominal Thickness(inch) 0.17 0.17 0.18 0.18 0.18 0.23 0.28 0.28 0.36
Hub I.D. 2.94 3.94 4.94 5.94 6.94 9.25 11.38 13.5 16.95
Telescoping Length 2.5 2.75 3 3 3 3.5 3.5 4.24 4.25
Barrell I.D. 1.96 2.96 3.94 4.94 5.94 7.97 9.94 11.94 15.16
Barrell O.D. 2.3 3.3 4.3 5.3 6.3 8.38 10.5 12.5 15.88
View Cast Iron Pipe Weight Chart and ASTM A197 Chemical Composition

CI Pipe Weight Chart


Size 2 x 5 3 x 5 4 x 5 5 x 5 6 x 5 8 x 5 10 x 5 12 x 5 15 x 5
Length (Ft) 5 5 5 5 5 5 5 5 5
Weight(pounds) 22.5 31.8 41 52.5 69.2 101 150.9 185.7 287.5

ASTM A197 Chemical Composition


Carbon

2.9%

Silicon

1.9%

Manganese

0.65%

Phosphorus

0.1%

Sulphor

0.2%

Black Malleable Pipe Fittings Mechanical Properties


Tensile strength Hardness Elongation
300MPa 150HB 6%

MI Fittings Pressure Ratings


Temperature Temp °C -29 to 66 125 275 100 150 200 175 225 250 288
Temp °F -20 to 151 257 527 212 302 392 347 437 482 550
Class 150 bar 20.7 15.2 - 17.5 12.8 - 10.5 - - -
PSI 300.23 220.46 - 253.82 185.65 - 152.29 - - -
Class 300 2 1/2 - 3" bar 69 56.1 23.4 61.5 50.7 39.8 45.2 34.3 28.9 20.7
PSI 1000.8 813.66 339.39 891.98 735.34 577.25 655.57 497.48 419.16 300.23
1/4" - 1" bar 137.9 106.4 26.9 119.6 93.1 66.6 79.9 53.4 40.1 20.7
PSI 2000.1 1543.2 390.15 1734.7 1350.3 965.95 1158.9 774.5 581.6 300.23
11/4 - 2" bar 103.4 81.1 25.2 90.5 71.8 53.1 62.5 43.8 34.5 20.7
PSI 1499.7 1176.3 365.5 1312.6 1041.4 770.15 906.49 635.27 500.38 300.23

Galvanized Malleable Iron Fittings Size Chart


Malleable Iron Elbow  
  Size 1/8 3/8 1 1/2 1/4 3/4 1 1/2 1 1/4 2 3 2-1/2 4 6 5
90 Elbow A 0.69 0.95 1.50 1.12 0.81 1.31 1.94 1.75 2.25 3.08 2.70 3.79 5.13 4.50
45 Elbow A 0.63 0.80 1.12 0.88 0.73 0.98 1.43 1.29 1.68 2.17 1.95 2.61 3.46 3.05
90 Street Elbow A 0.69 0.95 1.50 1.12 0.81 1.31 1.94 1.75 2.25 3.08 2.70 3.79    
B 1.00 1.44 2.14 1.62 1.19 1.89 2.69 2.45 3.26 4.52 3.86 5.69    
Side Outlet Elbow A       1.10   1.30                
45 Street Elbow A 0.63 0.80 1.12 0.88 0.73 0.98 1.43 1.29 1.68 2.17 1.95 2.61    
B 0.83 1.03 1.47 1.15 0.94 1.29 1.88 1.71 2.22 3.00 2.57 3.70    

Reducing Elbow
Size A B
4x3 3.3 3.6
3/8x1/8 0.81 0.85
1/2x1/4 0.97 0.98
3/8x1/4 0.88 0.9
3/4x1/4 1.05 1.08
3/4x3/8 1.12 1.13
1/2x3/8 1.04 1.03
3/4x1/2 1.2 1.22
1x1/2 1.26 1.4
1-1/4x1/2 1.34 1.53
1x3/4 1.37 1.45
1-1/4x1 1.58 1.67
1-1/4x3/4 1.45 1.62
1-1/2x1/2 1.38 1.64
4x2 2.72 3.43
1-1/2x1 1.65 1.8
1-1/2x3/4 1.52 1.75
1-1/2x1-1/4 1.82 1.88
2x3/4 1.6 1.97
2x1/2 1.48 1.87
2x1 1.73 2.02
2x1-1/2 2.02 2.16
2x1-1/4 1.9 2.1
2-1/2x1-1/4 1.99 2.36
2-1/2x1-1/2 2.16 2.51
2-1/2x2 2.39 2.6
3x2-1/2 2.83 2.99
3x1-1/2 2.29 2.84
3x2 2.52 2.89
1/4x1/8 0.74 0.76

Malleable Iron Elbow  
  Size 1/4 1/8 1/2 3/8 3/4 1-1/4 1 1-1/2 2-1/2 2 3 5 4 6
Tee A 0.81 0.69 1.12 0.95 1.31 1.75 1.50 1.94 2.70 2.25 3.08 4.50 3.79 5.13
Street Service Tee A     1.12   1.31   1.50              
B     1.62   1.89   2.14              
Side Outlet Tee A     1.10   1.30                  

Reducing Tee
Size A B
1/2x3/8 1.04 1.03
1x1/4 1.11 1.22
1x3/8 1.18 1.28
3/4x3/8 1.12 1.13
1-1/4x3/4 1.45 1.62
1x1/2 1.26 1.4
1x3/4 1.37 1.45
1-1/4x1 1.58 1.67
1-1/2x3/4 1.52 1.75
2x1/2 1.49 1.88
2x3/4 1.6 1.97
2x1 1.73 2.02
2x1-1/4 1.9 2.1
2x1-1/2 2.02 2.16
2-1/2x3/4 1.74 2.32
2-1/2x1-1/2 2.16 2.51

Cast Iron Types and Its Properties


Types of cast iron  
Property Tensile Strength Fatigue Strength (MPa) Elasticity Modulus(GPa) Thermal Conductivity (W/(mK)) Yield Strength (0.2%) Hardness (Hv)
Gray cast irons 235 100 110 48 160 208
Diffrence 113% 105% 27% -27% 138% 13%
Cast iron graphite in veins 500 205 140 35 380 240
Spheroidal graphite cast iron 650 265 165 28 425 286
Difference 30% 29% 18% -20% 12% 20%