Dura-Bar Ni-Resist irons contain an austenitic matrix of approximately 10% alloy carbides. The austenitic structure is suitable for corrosive environments in sour well oils, salts, salt water acids and alkalies. The iron is relatively soft and chrome is added to produce carbides that help improve wear resistance. Ni-Resist is denser than gray or ductile irons and has a higher coefficient of thermal expansion. Dura-Bar Type 1 Ni-Resist is manufactured to produce a material conforming to ASTM A436. To learn more, download the Dura-Bar 201 Type 1 Ni-Resist Iron Product Brief.
Visit our applications list for more detailed information on 201 Type 1 applications.
|Insecticide Pumps, Piston Ring Inserts, Sea Water Valves||Valve Guides|
The microstructure will consist of Type VII, A, size 4-6 graphite as defined in ASTM A247. The matrix will be austenite with 5-10% alloy carbide. The edge or rim will contain Type D graphite, size 6-8. Chill carbides are less than 5% in any field at 100x and will be well dispersed.
Carbon and silicon targets are specified for each bar size in order to control the size and shape of the graphite flake. Titanium is added as an inoculant in order to produce the Type D graphite structure.
|Silicon||1.00 - 2.80%|
|Manganese||0.50 - 1.50%|
|Nickel||13.50 -17.50% Max|
|Copper||5.50 - 7.50%|
|Chromium||1.50 - 2.50%|
Brinell hardness values for nominal as-cast diameters are shown in the table. Hardness properties listed are minimum, maximum across the bar. Hardness values for rectangles and squares are a function of the height and width ratios and will be supplied on request. BHN in the center of bars 1.750" and smaller may be lower than the values shown because of thermal center microshrinkage.
|1.000 - 6.000||25 - 152|
The tensile strength will be approximately 25,000 psi for bars up to 3.00" diameter and 20,000 psi for bars larger than 3.00". Tensile strength tests in bars 1.750" and smaller may not be accurate because of thermal center microshrinkage.
|Tensile strength psi (min)||20,000|
|Yield strength psi (min)||N/A|
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