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发表于 2013-6-16 12:16:13
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Dura-Bar G2 Continuously Cast Gray Iron Bar Stock ASTM A48
Categories: Metal; Ferrous Metal; Cast Iron; Alloy Cast Iron; Gray Cast Iron
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 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.
Gray iron bar stock’s microstructure consists of graphite flakes in a solid metal matrix. The solid metal matrix, in the class 40 grades (Dura-Bar grade G2), is pearlite.
The flake graphite provides excellent vibration damping for gears and machine tool components. Textile plant machinery utilize a lot of gray cast iron, because the damping coefficient dramatically reduces the factory noise The same holds true for machine tool components and automotive gears.
Compared to ductile iron, which has strengths closer to carbon steel, gray iron is the weaker, more brittle member of the cast iron family. Dura-Bar G2 is still considered an engineered material, having properties that are more than suitable for a wide variety of applications.
Information provided by Dura-Bar.
Key Words: Cast iron, gray iron, class 40, DuraBar
Composition: Typical chemical composition and ranges, actual values depend on cross section size
Vendors:
Available Properties
Density, Approximately 10% lighter than carbon steel
Hardness, Brinell, Depends on cast section size and location of test
Tensile Strength, Ultimate, Typical
Elongation at Break, Typical
Reduction of Area
Tensile Modulus, Typical
Compressive Yield Strength, Compressive yield = compressive ultimate, approx 3X tensile strength
Fatigue Strength, rotating beam
Shear Strength, Shear strength will be 1.2 X tensile strength
Charpy Impact, Gray iron usually not recommended in high impact loading applications
Volume Resistivity, At 2.50% Silicon
Magnetic Permeability, 25 Oersteds, High hysteresis loss
CTE, linear, Mean
CTE, linear, Mean
CTE, linear, Mean
CTE, linear, Mean
Specific Heat Capacity
Thermal Conductivity
Melting Point, Eutectic temp
Maximum Service Temperature, Air, Brittle behavior throughout temperature range
Minimum Service Temperature, Air
Antimony, Sb
Carbon, C
Chromium, Cr
Copper, Cu
Iron, Fe
Manganese, Mn
Phosphorous, P
Silicon, Si
Sulfur, S
Tin, Sn
Property Data
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Manufacturer Notes:
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发表于 2013-6-15 21:14:00
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