ASTM A type D-2M class 1 is a type of austenitic nodular cast iron. Cited properties are appropriate for the annealed condition. It has the. See the chemical composition and physical properties of ASTM A Grade D- 2M-1, find alternative materials, and connect with suppliers. Find the most up-to-date version of ASTM A at Engineering
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Silicon-Molybdenum Ductile Irons C. Austenitic Ductile Irons D. Introduction The purpose of standard specifications for Ductile Iron castings is to provide a body of aetm which can be used with confidence by both designer and foundry to select, define and agree upon a set of specific properties which will ensure that the castings meet the intended use of the designer.
The use of standard specifications simplifies the purchase of castings from multiple suppliers because it defines a standard casting whose properties meet the designer’s needs, regardless of where, or how the castings were produced. Specifications should be chosen carefully and used sparingly to ensure that they adequately define the designer’s needs without adding superfluous constraints which needlessly restrict the suppliers’ options, complicate the casting process and increase the cost of the casting.
It is the responsibility of both the designer and the foundry to be aware of the role and the limitations of specifications and to agree upon a specification that provides the optimum ratio of performance to cost. It is up to the designer to specify a set of properties – mechanical, physical, asrm or dimensional – which best suit the casting to its purpose.
Once the specification has been selected, the foundry must ensure that all castings delivered meet or exceed the specification.
The raw asfm and production methods used by the foundry to provide conforming castings are not normally restricted by the designer or the specification unless the specification includes such instructions, or the designer and foundry agree to append additional instructions to a specification.
Such instructions should be used judiciously, because they almost invariably increase the casting cost and restrict the number of foundries which can provide competitive bids. The other standards cover austenitic and special Ductile Iron applications. 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.
Other Standards This section also summarizes the national standards for Ductile Iron for the other major industrialized countries and the international ISO standard. This standard, and its replacement, the Astn standard EN will become increasingly important with the formation of the European Community.
There are many additional standards for Ductile Iron, some national, and others valid only within a specific technical or commercial organization. While each specification may have its own distinguishing characteristics, there are also many similarities between specifications.
ASTM A571/A571M – 01(2015)
Before using any specification, the designer should obtain a complete copy of the current issue from the specifying body to familiarize himself with both the properties specified and the conditions under which they are to be measured.
Standard specifications for Ductile Iron are normally based on mechanical properties, except for those defining austenitic Ductile Iron, which are based on composition. Mechanical property values are given in the units normal to the particular specifying body. Conversions for SI, metric non-SI, and non-metric units are given at the end of this section to assist in comparing specifications.
Chemical Requirements The castings shall conform to the following requirements for chemical composition Note 3: Physical Requirements Tensile Properties – The Ductile Iron as represented by the test specimens shall conform to the following requiremenets for tensile properties: B Not intentionally added.
This standard specifies that all castings shall be heat treated by annealing between and o F for 1 hour per inch of casting section and furnace cooling.
SAE specification for Ductile Iron casting and austempered Ductile Iron casting are currently being revised so they were not available as of the time of this printing.
Grade Tensile strength, R m1 min. Yield strength, Proof stress, R po. Minimum properties are specified by agreement between manufacturer and purchaser. The mechanical properties are given for information only.
FCD min. FCD 15 min. FCD A Over 30, up to and incl. The values for these maerials apply to castings cast in sand moulds of comparable thermal diffusivity.
Subject to amendments to be agreed upon in the order, they can apply to castings obtained by alternative methods. Whatever the method used for obtaining the castings, the grades are based on the mechanical properties measured on test pieces taken from samples separately cast in a sand mould or a mould of comparable thermal diffusivity.
Minimum impact resistance values measured on V-notch test pieces machines from separately cast samples. The properties of a cast-on test piece cannot exactly the properties of the casting itself, but can be a better approximation than those obtained on a separtely cast sample.
Further values are given in annex D for guidance. The material designation is in accordance with EN Minimum impact resistance values measured on V-notched test pieces machined from cast-on samples. The values for the materials normally apply to castings with thicknesses between 30 mm and mm and with a mass greater than kg or when the relevant wall thickness may vary between 30 mm and mm. The properties of a cast-on test piece cannot reflect exactly the properties of the casting itself, but can be a better approximation than those obtained on a separately cast sample.
Mechanical properties measured on test pieces machined from separately cast samples. The values for the materials apply to castings cast in sand moulds of comparable thermal diffusivity. English, SI units, and non-SI metric units. Beyond Specifications Standards and specifications ensure uniformity and assist both the designer and the foundry in defining the most important properties of the castings. However, most of the specifications identify either minimum properties, or ranges of properties, inferring that all castings whose properties either exceed the minimum or lie anywhere within the range, are equally acceptable.
This inference is incorrect, and high quality castings, whose properties either consistently exceed requirements, or fall well within specified ranges, offer the designer a competitive edge.
Through commitments to SPC and continual quality improvement, many foundries have developed the capability to produce castings whose higher quality can be demonstrated statistically.
Designers should take advantage of these capabilities to obtain assured quality which is superior to that required by specifications. American Society of Automotive Engineers Inc. HB, kgf load to Test Coupon Section Thickness 1 in. Complete specifications may be obtained from: American Society for Testing Materials. Society of Automotive Engineers Inc.
FCAD min. Tensile strength R m min. Proof stress R p0. UNS numbers and corresponding American specifications. This standard specifies chemical, physical, and hardness requirements. A Additions of 0. Tensile strength, min, ksi MPa. The castings shall conform to the following chemical requirements: Test Coupon Section Thickness. The castings shall have a carbon equivalent of 3. Elongation in 2 in.
Tensile Requirements for Special Applications. Tensile strength, min, psi. Tensile strength, min, MPa.
Yield strength, min, psi. Yield strength, min, MPa. Mechanical Property Requirements A. Charpy V-notch, ft-lbf min, average 3 tests. Tensile strength, R m1 min. A wide variety of properties are possible. Range specified by agreement. Mechanical properties of separately cast test sample. Mean value of 3 pieces J. Pearlite or tempered structure.
Ductile Iron Data – Section 12
Mechanical properties of cast-on test sample. Chief thickness of iron casting mm. Over 30, up to and incl. Over 60, up to and incl. Minimum impact resistance asstm in J.
Mean value from 3 tests. Relevant wall thickness t mm. Brinell hardness range HB. Other properties for information only. Pearlite or temper structure. Minimum tensile strength R m MPa. Minimum proof stress R p0. Impact strength energy loss J. Boiling Point o F.