The “ASTM D814-95 Standard Specification for Nickel-chromium-iron-molybdenum-tungsten Alloy (UNS N06920) for Dress, Sewing and Strip” standard, published by the American Society for Testing and Materials (ASTM) , describes the requirements for nickel-chromium-iron-molybdenum-tungsten alloy UNS N06920 in rolled sheet, plate and strip form for general corrosion service.
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The following types of products are covered by this specification:
For the purposes of this standard, the following definitions apply:
Orders for materials under this standard must include the following information:
The material must conform to the chemical composition in the table given in the standard. If a product (control) analysis has been performed by the purchaser, the material must conform to the specified conditions subject to the allowable tolerances shown in the table.
In terms of mechanical properties, the material must comply with the room temperature tensile properties specified in the table.
The density of 8,39 g/cm3 is used to calculate the weight of the material covered by this standard. The changes allowed in the plate thickness shall be as specified in the tables given in the standard. The changes allowed in the plate and strip thickness shall be as specified in the table. The thickness is measured with a micrometer spindle at any edge for material 25,4 mm or more in width and 25,4 mm or more in width at any point for material less than 9,525 mm in width.
The permitted changes in the width of rectangular plates shall be as specified in the table. The permitted differences in width for plates and strips shall be as specified in the table.
The permissible variations in the length of the rectangular plate shall be as specified in the table. Plates and strips can be ordered with a slight length, a variation of 0 mm is allowed on a given length with a tolerance of minus 3.175 in the bowl.
The curvature (beam depth) of flat sheet, strip and plate in the edge direction should not exceed the value described in the standard.
The evenness of the wrapped strips depends on the agreement between the manufacturer and the buyer.
The material must be uniform in quality and condition, free from stains and serious defects.
For samples, the batch for chemical analysis shall consist of a single heat. A number of sheets, plates or strips for mechanical testing are defined as material obtained from a single heat in the same condition and with the specified thickness.
A representative sample is taken from each heat for chemical analysis during bulk or subsequent processing. Product (control) analysis is the sole responsibility of the purchaser. Representative samples are taken from each finished material batch for mechanical testing.
Nickel-chromium-iron-molybdenum-tungsten alloy is one of several metal alloys marketed. It is generally available in almost any volume, as bars, ingots, strip, wire, shot, sheet, and foil.
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