ASTM A447-11(R2021) pdf free download

ASTM A447-11(R2021) pdf free download.Standard Specification for Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature Service
1. Scope
1.1 This specification covers iron-base, heat-resisting alloy castings ofthe 25 % chromium, 12 % nickel class, intended for structural elements, containers, and supports in electric furnaces, petroleum still tube supports, and for similar appli- cations up to 2000 °F [1095 °C]. 1.2 In the absence of significant proportions of elements other than those prescribed in Section 5, the two types ofalloys covered by this specification may in general be distinguished as follows: 1.2.1 Type I—Alloys characterized by relatively low limit- ing creep stress at temperatures between 1500 and 2000 °F [815 and 1095 °C], and relatively high ductility at ordinary temperatures after aging for short periods at temperatures between 1300 and 1500 °F [705 and 815 °C]. 1.2.2 Type II—Alloys having relatively high limiting creep stress but which may develop low ductility at ordinary tem- peratures when aged for short periods at temperatures between 1350 and 1500 °F [730 and 815 °C]. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3.1 Within the text, the SI units are shown in brackets. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. General Conditions for Delivery
3.1 Except for investment castings, material furnished to this specification shall conform to the requirements of Speci- fication A781/A781M, including any supplementary require- ments that are indicated in the purchase order. Failure to comply with the general requirements of Specification A781/ A781M constitutes nonconformance with this specification. In case of conflict between the requirements of this specification and Specification A781/A781M, this specification shall pre- vail. 3.2 Investment castings furnished to this specification shall conform to the requirements of Specification A957/A957M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general require- ments of Specification A957/A957M constitutes nonconfor- mance with this specification. In the case of conflict between the requirements of this specification and Specification A957/ A957M, Specification A957/A957M shall prevail.
8. Sampling
8.1 Material for the tests specified in Sections 11, 13, and 14 may be taken from separately cast test blocks ofa form such as that shown in Fig. 2 of Specification A1067/A1067M, from another type of test block, from the castings, or from coupons attached to the castings as may be agreed upon between the manufacturer and the purchaser. 8.2 Material for the magnetic permeability test specimen (Section 12) may be taken, prior to heat treatment, from the same coupon as the specimen for the tension test after aging; from suitable specimens cast as parts of separately cast test blocks; or, by agreement between the manufacturer and the purchaser, from castings representing the melt. 8.3 In the case of castings for unusual or severe service, the test coupons shall be attached to the castings at convenient locations as may be agreed upon between the manufacturer and the purchaser. 8.4 In all cases, it shall be the manufacturer’s duty to provide a sufficient number of samples for the specified tests.
9. Number of Tests
9.1 The purchaser shall specify not more than two tests selected from the following list, with the restriction that not more than one of the tension tests at high temperature (that is, 9.1.3 or 9.1.4) may be required: 9.1.1 Tension test after aging, 9.1.2 Magnetic permeability test, 9.1.3 Stress-rupture test, and 9.1.4 Short-time, high-temperature tension test.
10. Retests
10.1 Mechanical Tests—If any of the specimens first chosen for any of the mechanical tests agreed upon fails to conform to the specified requirements, an additional specimen from the same melt may be tested. This additional specimen shall conform to the requirements prescribed for the test in question. 10.2 Magnetic Test—If the magnetic permeability of the specimen first tested does not conform to the requirement prescribed in 12.1, three additional specimens from the same melt may be tested. At least two of these shall conform to the prescribed requirement.