ASTM-A859 › Historical Revision Information
Standard Specification for Age-Hardening Alloy Steel Forgings for Pressure Vessel Components
The following bibliographic material is provided to assist you with your purchasing decision:
This specification covers the standard requirements for low-carbon age-hardened nickel-copper-chromium-molybdenum-columbium alloy steel forgings for pressure vessel components. Materials shall be manufactured to a killed fine austenitic grain size, by vacuum degas melting process. Heat treatment shall be conducted, according to class, by: normalizing and precipitation hardening (Grade A, Class 1); liquid quenching and precipitation hardening (Grade A, Class 2); or double liquid-quenching, tempering, double austenitizing, and precipitation hardening (Grade B). Heat and product analyses shall be used to evaluate the conformance of forgings to required chemical compositions. Tensile, notch toughness, and Charpy impact requirements shall be examined, for which one of four sampling methods may be employed. One tension test and one impact test (for three samples) shall be made for each forging. Dimensions and finishes of the forgings shall conform to that specified by the purchaser. Repair welding shall also be performed only if permitted by the purchaser.
Scope
1.1 This specification covers requirements for low-carbon age-hardening nickel-copper-chromium-molybdenum-columbium alloy steel forgings for pressure vessel components.
1.2 Forgings under this specification are available as Grades A or B. Grade A may be ordered in one or two classes as follows:
1.2.1 Grade A Class 1Normalized-and-precipitation-heat-treated, providing a minimum yield strength of 55 ksi [380 MPa] and a minimum tensile strength of 65 ksi [450 MPa].
1.2.2 Grade A Class 2Quenched-and-precipitation-heat-treated, providing a minimum yield strength of 65 ksi [450 MPa] and a minimum tensile strength of 75 ksi [MPa].
1.2.3 Grade A was the original steel composition in this specification.
1.3 Although the material is readily weldable, welding procedures are of fundamental importance and must be such as not to affect adversely the properties of the material, especially in the heat-affected zone. It is presupposed that welding procedures will be suitable for the material being welded.
1.4 Supplementary requirements, including those applicable in Specification A 788, are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.5 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.6 This specification is expressed in both inch-pound and SI units. However, unless the order specifies the applicable "M" specification designation [SI units], the material shall be furnished to inch-pound units.
Keywords
precipitation hardening steel; pressure containing parts; pressure vessel service; steel forgings-alloy; ICS Number Code 77.140.30 (Steels for pressure purposes)
To find similar documents by ASTM Volume:
01.05 (Steel--Bars, Forgings, Bearing, Chain, Tool)
To find similar documents by classification:
This document comes with our free Notification Service, good for the life of the document.
This document is available in either Paper or PDF format.
Document Number
ASTM-A859/A859M-04
Revision Level
2004 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
March 1, 2004
Document Type
Specification
Page Count
5 pages
Committee Number
A01.06