SB 271 - SPECIFICATION FOR COPPER-BASE CENTRIFUGAL CASTINGS...

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Unformatted text preview: SPECIFICATION FOR COPPER-BASE CENTRIFUGAL CASTINGS SB-271 (Identical with ASTM Specification B 271-93a for the alloys covered. Certification has been made mandatory.) 1. Scope 3. General Requirements 1.1 This specification establishes requirements for centrifugally cast copper-base alloys having the nominal compositions shown in Table 1. 1.2 The values stated in inch-pound units are to be regarded as the standard. Metric values in parentheses are given for information only. 3.1 Material furnished under this specification shall conform to the applicable requirements of Specification SB-824. 4. Ordering Information 4.1 Orders for centrifugal castings under this specification shall include the following information: 2. Referenced Documents 4.1.1 Quantity and dimensions or drawing number, 4.1.2 Copper Alloy UNS No. (Table 1) and temper (as-cast, heat-treated, etc.), 4.1.3 Specification title, number, and year of issue, 2.1.1 ASTM Standards: B 208 Practice for Preparing Tension Test Specimens for Copper-Base Alloys for Sand, Permanent Mold, Centrifugal, and Continuous Castings 2.1.2 ASME Standards: SB-824 General Requirements for Copper Alloy Castings 4.1.4 Chemical analysis of residual elements, if specified in the purchase order (Specification SB-824), 4.1.5 Pressure test requirements, if specified in the purchase order (Specification SB-824), 4.1.6 Soundness requirements, if specified in the purchase order (Specification SB-824), 4.1.7 Repair of castings (Section 9), TABLE 1 ASME DESIGNATIONS AND ALLOY NUMBERS Copper ASME Alloy Designation UNS No. SB-148 C95200, C95400 Previous DesignationA 9A, 9C 2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent referenced herein: 4.1.8 Certification (Specification SB-824), 4.1.9 Foundry test report, if specified in the purchase order (Specification SB-824), 4.1.10 Witness inspection, if specified in the purchase order (Specification SB-824), and 4.1.11 Product marking, if specified in the purchase order (Specification SB-824 and Section 10). 372 Classification Aluminum bronze A Designations used in Specification B 271-54, which appeared in the 1969 Book of ASTM Standards, Part 5. COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services PART B — NONFERROUS MATERIAL SPECIFICATIONS SB-271 5. Materials and Manufacture 7. Mechanical Requirements 5.1 Copper Alloy UNS No. C95400 may be supplied in the heat treated condition to obtain the higher mechanical properties shown in Table 3. Suggested heat treatments for this alloy are given in Table 5. Actual practice may vary by manufacturer. 7.1 Mechanical properties shall meet the requirements shown in Table 3. 8. Sampling 8.1 Separate centrifugally cast test bars shall be made in accordance with Practice B 208. 8.2 At the manufacturer’s option test bars may be removed from the casting instead of from a separately cast coupon. 6. Chemical Composition 8.3 Separately cast test bars representing castings in Copper Alloy UNS No. C95400 HT temper shall be heat treated with the casting. 9. Weld Repair 6.1 The centrifugal castings shall conform to the chemical requirements shown in Table 2. 6.2 These specification limits do not preclude the presence of other elements. Limits may be established for unnamed elements by agreement between the manufacturer and purchaser. Copper or zinc may be given as remainder and may be taken as the difference between the sum of all elements analyzed and 100%. When all named elements in Table 3 are analyzed, their sum shall be as specified in Table 4. 6.3 It is recognized that residual elements may be present in cast copper-base alloys. Analysis shall be made for residual elements only when specified in the purchase order (Specification SB-824). 9.1 The castings shall not be weld repaired without customer approval. 10. Product Marking 10.1 When specified in the purchase order, the castings shall be marked with the alloy number. 11. Keywords 11.1 centrifugal castings; copper alloy castings; copper-base alloy castings 373 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services SB-271 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services TABLE 2 CHEMICAL REQUIREMENTS Composition, % max Except as Indicated Major Elements Residual Elements 2001 SECTION II 374 Tin Lead Zinc ... ... ... ... ... ... 2.5–4.0 3.0–5.0 ... 1.5 8.5–9.5 10.0–11.5 ... 0.50 ... ... ... ... ... ... Iron Nickel incl Cobalt Aluminum Manganese Silicon Iron Antimony Copper Alloy UNS No. Copper Nickel incl Cobalt ... ... Sulfur ... ... Phosphorus ... ... Aluminum ... ... Other Silicon ... ... ... ... C95200 C95400 86.0 min 83.0 min PART B — NONFERROUS MATERIAL SPECIFICATIONS SB-271 TABLE 3 MECHANICAL REQUIREMENTS Tensile Strength, min Copper Alloy UNS No. C95200 C95400 C95400(HT) A B Yield Strength,C min ksi A ksi A MPa B MPa B Elongation in 2 in. Or 50 mm, min, % 20 12 6 Brinell Hardness No.D (3000-kG Load), min 110 150 190 65 75 90 450 515 620 25 30 45 170 205 310 ksi–1000 psi. See Appendix. C Yield strength shall be determined as the stress producing an elongation under load of 0.5%, that is 0.01 in. (0.254 mm) in a gage length of 2 in. (50.8 mm). D For information only. TABLE 4 SUM OF ALL NAMED ELEMENTS ANALYZED Copper Alloy UNS No. C95200 C95400 Copper Plus Named Elements % min 99.0 99.5 TABLE 5 SUGGESTED HEAT TREATMENTS Solution Treatment (not less than 1 h followed by water quench) 1600–1675°F (870–915°C) Annealing Treatment (not less than 2 h followed by air cool) 1150–1225°F (620–665°C) Copper Alloy UNS No. C95400 375 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services ...
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This note was uploaded on 10/04/2010 for the course ENGINEERS 22453175 taught by Professor Heydari during the Spring '08 term at Miami University.

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