Austenitic Ductile Cast Irons

The materials are austenitic stainless steel (Hereafter,it is said SUS304), ductile cast iron (Hereafter, it is said FCD500), and pure Ni. The composition of the materials is shown in Table. 1. Moreover, the sound characteristic of the materials and air as the defect are shown in Table.2. 

Gray cast irons do not have the abrupt ductile to brittle fraction transition down to -40°C as takes place in steels. Special austenitic nodular cast iron similar to the AUS 203 grade, but with a higher manganese content of about 4%, has been obtained for cryogenic purposes for temperatures down to -253°C. 

Pipes for circulating hot (>40 °C) acid around the plant are usually constructed of either ductile cast iron (MondF or Meehanite ) or high silicon austenitic stainless steel. The advantages of using stainless steel for acid piping are ... 

Nickel—Iron. A large amount of nickel is used in alloy and stainless steels and in cast irons. Nickel is added to ferritic alloy steels to increase the hardenabihty and to modify ferrite and cementite properties and morphologies, and thus to improve the strength, toughness, and ductihty of the steel. In austenitic stainless steels, the nickel content is 7—35 wt %. Its primary roles are to stabilize the ductile austenite stmcture and to provide, in conjunction with chromium, good corrosion resistance. Nickel is added to cast irons to improve strength and toughness. 

Temperature, op Carbon steel, carbon-molybdenum low-chromium (through 3 Cr Mo) 5Cr Mo through 9 Cr Mo Austenitic stainless steels, 18 Cr, 8 Ni 12 Cr 17 Cr 27 Cr 25 Cr, 20 Ni Monel 67 Ni, 30Cii 3V2 Nickel Aluminum Gray cast iron Bronze Brass 70Cii, 30 Ni Ni-Fe-Cr Ni-Cr-Fe Ductile iron... 

ASTM A439 Austenitic ductile iron castings 1694 3468 NFA 32301 G5510... 

Ni resist ASTM A 436, Type 1,2, or 3, UNS F41 000 1 F41002 / F41004 respectively (austenitic cast iron)-, ASTM A 439, Type 02, UNS F43000 (austenitic ductile iron)... 

Hardness of Gray Cast Irons Hardness of Gray Cast Iron Bars Hardness of Malleable Iron Castings Hardness of Ductile Irons Hardness of Tool Steels Hardness of Austenitic Stainless Steels Hardness of Ferritic Stainless Steels Hardness of Martensitic Stainless Steels Hardness of... 

The high-alloy cast irons are generally divided into three groups austenitic, austenitic ductile, and high-silicon cast irons. Each will be discussed separately. 

HIgh-nIckel austenitic oast Irons. High-nickel austenitic cast irons contain large percentages of nickel and copper and are fairly resistant to acids. When nickel levels exceed 18%, austenitic cast irons are nearly immune to alkalies or caustics, although SCC can occur. High-nickel cast irons can be nodularized to yield ductile irons. 

ASTM A 312/A 312M, Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipes ASTM A 395, Standard Specification for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures ... 

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