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Ductile Iron Grades of UNS, ASTM, AMS, SAE and MIL

The ASTM has five standards covering Ductile Iron castings.

ASTM A 536 is the most frequently used, covering the general engineering grades of Ductile Iron. The other standards cover austenitic and special Ductile Iron applications. The ASTM has issued in 1990 a new specification defining the properties of Austempered Ductile Iron.

The SAE standard J434 is commonly used for specifying automotive Ductile Iron castings. In an attempt to create a single, comprehensive system for designating metals and alloys the ASTM and SAE have jointly developed the Unified Numbering System (UNS).

While not itself a specification, the UNS designation is gaining some degree of acceptance in North America as a useful means of simplifying and correlating the various existing specifications.

The UNS designations for Ductile Irons, cross referenced to the corresponding ASTM, AMS, SAE and MIL specifications, are shown below.

UNS numbers and corresponding American specifications

Standard

Numbers/Grades

UNS

F3000

F32800

F32900

F33100

F33101

F33800

F34100

ASTM A395

  

60-40-18

  

  

  

  

  

ASTM A536

  

60-40-18

  

65-45-12

  

80-55-06

  

ASTM A476

  

  

  

  

  

   

80-60-03

ASTM A716

  

  

******

  

  

  

  

AMS

  

  

  

  

5315

  

5316

SAE J434

DQ & T

D4018  

  

D4512

  

D5506

  

MIL-I-24137

  

  

  

  

(A)

  

  

  

UNS

F34800

F36200

F43000

F43001

F43002

F43003

F43004

ASTM A439

  

  

D-2

D-2B

D-2C

C-3

C-3A

ASTM A536

100-70-03

120-90-02

  

  

  

  

  

SAE J434

D7003

  

  

  

  

  

  

  

UNS

F43005

F43006

F43007

F43010

F43020

F43021

F43030

ASTM A439

D-4

D-5

D-5B

  

  

  

  

ASTM A571

  

  

  

D-2M

  

  

  

AMS

  

  

  

  

  

  

5395

MIL-I-24137

  

  

  

  

(B)

(C)

  

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