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Dura-Bar grade 201 Type 1 offered by Dura-Bar Metal Services #

Ni-Resist Iron 201 Type 1

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.


Depiction of Dura-Bar microstructure

100x, etched in 5% Nitol Center view of Dura-Bar 201 Type 1 microstructure

100x, etched in 5% Nitol Edge view of Dura-Bar 201 Type 1 microstructure

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 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.

Chemical Composition
C% Si% Mn% Ni% Cu% Cr% S%
3.00 max 1.00-2.80 0.50-1.50 13.50-17.50 5.50-7.50 1.50-2.50 0.12 max

Typical Uses of Ni-Resist (ASTM A436) Cast Iron

Insecticide Pumps, Piston Ring Inserts, Sea Water Valves
Valve Guides

Grade Properties of Ni-Resist (ASTM A436) Cast Iron

Mechanical: 201 Type 1
Tensile Strength (psi) 20,000
Yield Strength (psi) N/A
Elongation (%) N/A
Machinabilty Rating (1212=100%) N/A
Hardness (BHN) (AVG) 157
Relative Wear Resistance N/A
Heat-Treat Response (Rc) N/A
Machining Guidelines: 201 Type 1
Machining Operation Maching Speed (sfm) Feed (ipr) Depth of Cut (inches)
Rough Turn (OD & ID) Contact Dura-Bar Metal Services
Finish Turn (OD & ID)
Drilling/Milling (indexable)
(solid carbide)