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Dura-Bar 120-90-02 Continuously Cast Ductile Iron Bar Stock ASTM A536

Category Metal , Ferrous Metal , Cast Iron , Alloy Cast Iron , Ductile Iron , Martensitic
Manufacturer Dura-Bar
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Dura-Bar 120-90-02 Continuously Cast Ductile Iron Bar Stock ASTM A536.pdf
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Material Notes:
Continuously cast ductile iron bar stock is produced in a wide variety of sizes and shapes, including rounds, rectangles and special shape cross sections.It often is used as a direct replacement for plain carbon steel and can offer dramatic cost reductions for parts that require a lot of machining. The machinability rating of ductile iron bar stock will be similar to free machining carbon steel grades, such as 12L14, 11L17, 86L20, 1141 and 1144, and achievable machining speeds will be significantly higher.Ductile iron contains graphite in the form of very small, round nodules that give the material free machining properties without the addition of lead, bismuth, sulfur or phosphorus. It often is used as an alternative to gray iron castings. The continuous casting process eliminates typical foundry defects, such as gas holes, hard spots, slag inclusions and inconsistent properties, that result from different molding methods. Bars are cast through a water-cooled graphite die mounted on the bottom of a large bar machine crucible. The ferrostatic head pressure created by the molten metal in the bar machine crucible forces iron into the die, producing a very fine-grained microstructure. The outer “rim” is the only part of the bar that is solid when it exits the die. The core is molten iron. Heat from the molten iron core reheats the rapidly chilled outer skin, producing a homogenized microstructure that is cooled to room temperature in still air.Ductile iron bar stock consists of a microstructure that is made up of graphite nodules in a solid metal matrix. The solid metal matrix will be similar to the matrix structure in carbon steel bars, and the amount of combined carbon determines the mechanical and physical properties of each grade. The 120-90-02 ductile iron grade must be heat treated and will contain a martensitic matrix. After quench and tempering, the hardness of this grade will range from Rc 20 - Rc 55 depending on the tempering temperature.Composition: Typical chemical composition and ranges, actual values depend on cross section size.Information provided by Dura-Bar
Physical Properties Metric English Comments
Density 6.64 - 7.20 g/cc
0.240 - 0.260 lb/in³
Approximately 10% lighter than carbon steel
Mechanical Properties Metric English Comments
Hardness, Rockwell C 30 - 55
30 - 55
Tensile Strength, Ultimate >= 827 MPa
>= 120000 psi
Mid-radius
Tensile Strength, Yield >= 621 MPa

@Strain 0.200 %
>= 90000 psi

@Strain 0.200 %
Elongation at Break >= 2.0 %
>= 2.0 %
Reduction of Area 2.0 %
2.0 %
Tensile Modulus 172 GPa
25000 ksi
Typical
Compressive Yield Strength >= 745 MPa
>= 108000 psi
Poissons Ratio 0.275
0.275
Generally accepted value
Shear Modulus 67.6 GPa
9800 ksi
calculated
Shear Strength 745 MPa
108000 psi
Shear strength is 90% of tensile strength for all ductile iron grades
Thermal Properties Metric English Comments
CTE, linear 12.2 µm/m-°C

@Temperature 21.0 - 300 °C
6.78 µin/in-°F

@Temperature 69.8 - 572 °F
Mean
13.5 µm/m-°C

@Temperature 21.0 - 500 °C
7.50 µin/in-°F

@Temperature 69.8 - 932 °F
Mean
13.7 µm/m-°C

@Temperature 21.0 - 900 °C
7.61 µin/in-°F

@Temperature 69.8 - 1650 °F
Mean
Specific Heat Capacity 0.460 - 0.602 J/g-°C

@Temperature 22.2 - 699 °C
0.110 - 0.144 BTU/lb-°F

@Temperature 72.0 - 1290 °F
Thermal Conductivity 32.31 W/m-K
224.2 BTU-in/hr-ft²-°F
Melting Point 1120 °C
2050 °F
Eutectic temp
Maximum Service Temperature, Air 649 °C
1200 °F
Minimum Service Temperature, Air -30.0 °C
-22.0 °F
Component Elements Properties Metric English Comments
Carbon, C 3.5 - 3.9 %
3.5 - 3.9 %
Chromium, Cr <= 0.050 %
<= 0.050 %
Copper, Cu 0.10 - 0.50 %
0.10 - 0.50 %
Iron, Fe 95 %
95 %
Manganese, Mn 0.15 - 0.35 %
0.15 - 0.35 %
Phosphorous, P <= 0.050 %
<= 0.050 %
Silicon, Si 2.25 - 2.75 %
2.25 - 2.75 %
Sulfur, S 0.010 - 0.025 %
0.010 - 0.025 %
Tin, Sn 0.010 - 0.050 %
0.010 - 0.050 %
Electrical Properties Metric English Comments
Volume Resistivity 0.0000060 ohm-cm
0.0000060 ohm-cm
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