SA 695 - SPECIFICATION FOR STEEL BARS, CARBON, HOTWROUGHT,...

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Unformatted text preview: SPECIFICATION FOR STEEL BARS, CARBON, HOTWROUGHT, SPECIAL QUALITY, FOR FLUID POWER APPLICATIONS SA-695 (Identical with ASTM Specification A 695-90b for Type B only.) 1. Scope 1.1 This specification covers hot-wrought, special quality, round carbon steel bars subject to mechanical property requirements and intended for fluid power applications. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 3.3 All grades are not available in all types and sizes. See Section 8. 4. Ordering Information 4.1 Orders for material under this specification should include the following information: 4.1.1 Quantity (weight or number of bars). 4.1.2 Name of material (carbon steel bars). 2. Referenced Documents 4.1.3 Condition (hot wrought). 4.1.4 Finish (if descaled required, so state) (Section 9 and S3). 4.1.5 Dimensions (diameter and length). 4.1.6 ASTM designation and date of issue. 4.1.7 Type and grade (Tables 1 and 2). 2.1 ASTM Standards: A 29 /A 29M Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished, General Requirements for A 370 Test Methods and Definitions for Mechanical Testing of Steel Products 3. Classification 4.1.8 End use. 4.1.9 Additions to the specification and supplementary requirements if required. NOTE—A typical ordering description is as follows: 10,000 lb, Carbon Steel Bars, Hot Wrought, 4.5-in. diameter by 10 ft, ASTM A 695 dated , Type A, Grade 40, End Use Accumulator Heads; Supplementary Requirement S1 Straightness 0.125 in. in any 5 ft. 3.1 The bars are available only as hot-wrought rounds 3.0 in. [76 mm] in diameter and larger. Smaller sizes are specified and procured to a cold-finished specification. 3.2 The bars are furnished in the following types and grades: Type B Grade 35 40 Composition, % C 0.35 max., Mn 1.10 max., Si 0.15–0.35 Yield Strength, psi (MPa) 35,000 (240) 40,000 (275) 5. General Requirements 5.1 Material furnished under this specification shall conform to the applicable requirements of the current 1194 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services PART A — FERROUS MATERIAL SPECIFICATIONS SA-695 edition of Specification A 29 /A 29M unless otherwise provided herein. 8.2 Specimens — Tension test specimens shall be taken longitudinally in accordance with Test Methods and Definitions A 370. 8.3 Number of Tests — One tension test shall be made from each lot. A lot shall consist of all bars of one size from one heat processed at one time. 8.4 Test Methods — Tension tests shall be made in accordance with Test Methods and Definitions A 370. The yield strength shall be determined by an extension under load of 0.5% of the gage length. 9. Workmanship, Finish, and Appearance 6. Materials and Manufacture 6.1 Melting Practice — The steel shall be made by one or more of the following primary processes: openhearth, basic-oxygen, or electric-furnace. The primary melting may incorporate separate degassing or refining and may be followed by secondary melting using electroslag remelting or vacuum arc remelting. Where secondary melting is employed, the heat shall be defined as all of the ingots remelted from a single primary heat. 6.2 Deoxidation — Type B steels shall be silicon killed. 6.3 Quality — The bars shall be special quality. 6.4 Hot Working — The bars shall be hot wrought, as wrought. 9.1 Descaling—When descaled bars are required, Supplementary Requirement S3 must be specified. 9.2 The bars shall be free of visible pipe and conditioned as necessary to remove injurious surface imperfections. 10. Certification and Test Reports 7. Chemical Composition 7.1 The heat analysis shall conform to the requirements for chemical composition specified in Table 1. 8. Mechanical Properties 8.1 Tensile Requirements: 10.1 A manufacturer’s certification that the material was manufactured and tested in accordance with this specification together with a report of the heat analysis and tension test results shall be furnished at the time of shipment. The report shall include the name of the manufacturer, ASTM designation number and year date and revision letter, if any, type and grade, heat number, and size. 11. Product Marking 8.1.1 The material, as represented by the test specimens, shall conform to the tensile requirements specified in Table 2. 8.1.2 A deduction from the percentage of elongation specified in Table 2 of 1.0% shall be made for each 1.0 in. (25.4 mm) of specified diameter over 3.0 in. (76 mm) or fraction thereof to a maximum of 3%. 11.1 The heat number shall be steel stamped on one end of each bar. 12. Keywords 12.1 carbon steel bars; hot-wrought steel bars; pressure-containing parts; steel bars. 1195 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services SA-695 2001 SECTION II TABLE 1 CHEMICAL REQUIREMENTS (HEAT ANALYSIS), % Type B Carbon, max Manganese, max Phosphorus, max Sulfur Silicon Lead A 0.35 1.10 0.040 0.050 0.15–0.35 A Lead shall not be added to any steel produced for Type B. TABLE 2 TENSILE REQUIREMENTS Grade 35 40 A Type B B Tensile Strength, ksi (MPa), min 60 (415) 70 (485) Yield Strength,A ksi (MPa), min 35 (240) 40 (275) Elongation in 2 in. or 50 mm, min, % 21 17 Determined at 0.5% extension under load. 1196 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services PART A — FERROUS MATERIAL SPECIFICATIONS SA-695 SUPPLEMENTARY REQUIREMENTS One or more of the following supplementary requirements shall be applied only when specified by the purchaser in the inquiry, contract, or order. Details of these supplementary requirements shall be agreed upon in writing by the manufacturer and purchaser. Supplementary requirements shall in no way negate any requirement of the specification itself. S1. Special Straightness S1.1 Bars shall be furnished to special straightness tolerance. S2. Stress Relief Anneal S2.1 Bars shall be given a stress relief anneal subsequent to all hot and cold mechanical working operations. S3. Descaling S3.1 The surface of the bars shall be descaled by pickling or shot blasting. Descaled bars shall be oiled. 1197 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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