ASTM-A447/A447M:11(R2021) pdf free download – Standard Specification for Steel Castings, Chromium-Nickel-lron Alloy (25-12 Class), for High-Temperature Service.
4. Ordering Information
4.1 The inquiry and order should include or indicate the following:
4.1.1 A description of the casting by pattern number or drawing (dimensional tolerances shall be included on the casting drawing).
4.1.2 Which standard (A447 or A447M) applies,
4.1.3 The version of the alloy, that is. Type I or Type 11. to be supplied (Sections I. II. 12, 13, and l4).
4.1.4 Options in the specification
4.1.5 The supplementary requirements desired, including the standards of acceptance.
5. Process
5.1 The alloy for the castings shall be made by the electric- furnace process or by any other process approved by the purchaser.
6. heat Treatment
b. I Except as otherwise agreed upon between the manufacturer and the purchaser. the manufacturer shall not be required to heat treat the castings.
7. Chemical Composition
7.1 The castings shall conform to the requirements of Table I as to chemical composition.
8. Sampling
8.l Material for the tests specified in Sections 11, 13, and 14 may be taken from separately Cast test blocks of a form such as that shown in Fig. 2 of Specification A 1067/A 1067M. from another type ol 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 Lest specimen (Section 12) may be taken, prior to heat treatment, from the same coupon as the specimen for the tension lest after aging:
from suitable specimens cast as pans 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 sesere service, the lest coupons shall be attached to the castings at convenient locations as may be agreed upon between the manufacturer and the purchaser.
14.2 The test specimen shall conform to the dimensions shown in Fig. 8 of Test Methods F/E8M.
14.3 The specimen in the as-cast condition, that is, without any heat treatment after cooling from the casting temperature, shall he subjected to a short-time tension test during which the eiuperaiure shall be maintained at 16(X) ± 10 ‘F 1870 ± 5.5 °CI. The specimen shall he mounted in the testing furnace and held within this range of temperature for I h, and the test load then applied.
14.4 The test shall be made in accordance with Test Methods h2l except that the speed of hud of the testing machine
shall be so adjusted that the rate of separation of the gage
marks on the test specimen shall not exceed 0.03 in.
10.8 mrnj4nin.
15. Defective Test Specimens
15.1 It. any specimen shows defective machining or develops flaws, it may be discarded and another specimen from the same melt substituted.
15.2 If any part of the fracture in any of the specimens subjected to tension tests is more than ¾ in. 19.0 mml from the center of the gage length as indicated by gage marks placed on the specimen before testing, another specimen may be substituted.
16. Repair by Welding
16.1 Weld repairs shall be inspected to the same quality standards as arc used to inspect the castings.
16.2 When heat treatment is specified, the castings shall be heat treated after welding.
17. Key words
17.1 austenitic stainless steel: high temperature applications; stainless steel; steel castings
REQUIREMENTS.