ASME SA312-2013 pdf download

ASME SA312-2013 pdf download.Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel.
3.1.1 ASTM designation and year of issue, 3.1.2 Name of product, bolts or studs; and bolt head style, that is, hex or heavy hex, 3.1.3 Grade, that is, A, or B. If no grade is specified, Grade A is furnished. 3.1.4 Quantities (number of pieces by size includ- ing nuts), 3.1.5 Fastener size and length, 3.1.6 Washers — Quantity and size (separate from bolts), 3.1.7 Zinc Coating — Specify the zinc-coating pro- cess required, for example, hot-dip, mechanically depos- ited, or no preference (see 4.5). 3.1.8 Other Finishes — Specify other protective fin- ish, if required. 3.1.9 Specify if inspection at point of manufacture is required, 3.1.10 Specify if certified test report is required (see 8.2), and 3.1.11 Specify additional testing (8.3) or special requirements. 3.1.12 Forestablishmentofapartidentifying system, see ASME B18.24. 4. Materials and Manufacture 4.1 Steel for bolts and studs shall be made by the openhearth, basic-oxygen, or electric-furnace process. 4.2 Bolts shall be produced by hot or cold forging of the heads or machining from bar stock. 4.3 Heat Treatment: 4.3.1 Coldheaded fasteners with head configurations other than hex shall be stress relief annealed. 4.3.2 Stress relieving of hex head fasteners shall be at the manufacturer’s option. 4.4 Bolt and stud threads shall be rolled or cut. 4.5 Zinc Coatings, Hot-Dip and Mechanically Deposited: 4.5.1 When zinc-coated fasteners are required, the purchaser shall specify the zinc-coating process, for exam- ple hot dip, mechanically deposited, or no preference. 4.5.2 When hot-dip is specified, the fasteners shall be zinc-coated by the hot-dip process in accordance with the requirements of Specification F 2329. 4.5.3 When mechanically deposited is specified, the fasteners shall be zinc-coatedby the mechanical-deposition process in accordance with the requirements of Class 55 of Specification B 695. 4.5.4 When no preference is specified, the supplier may furnish either a hot-dip zinc coating in accordance with Specification F 2329, or a mechanically deposited zinc coating in accordance with Specification B 695, Class 55. Threaded components (bolts and nuts) shall be coated by the same zinc-coating process and the supplier’s option is limited to one process per item with no mixed processes in a lot. 5. Chemical Composition 5.1 Grade A and B bolts and studs shall have a heat analysis conforming to the requirements specified in Table 1 based on the steel producer’s heat analysis. 5.2 The purchaser shall have the option of conducting product analyses on finished bolts in each lot, which shall conform to the product analysis specified in Table 1. 5.3 In case of conflict or for referee purposes, the product analysis shall take precedence. 5.4 Bolts and studs are customarily furnished from stock, in which case individual heats of steel cannot be identified. 5.5 Application of heats of steel to which bismuth, selenium, tellurium, or lead has been intentionally added shall not be permitted for Grade B bolts and studs. 5.6 Chemical analyses shall be performed in accor- dance with Test Methods, Practices, and Terminology A 751. 6. Mechanical Properties 6.1 Grades A and B bolts and studs shall conform to the hardness specified in Table 2. 6.2 Grade A and B bolts and studs 1 1 ⁄ 2 in. in diameter or less, other than those excepted in 6.4, shall be tested full size and shall conform to the requirements for tensile strength specified in Table 3. 6.3 Grade A and B bolts and studs larger than 1 1 ⁄ 2 in. in diameter, other than those excepted in 6.4, shall prefera- bly be tested full size and when equipment of sufficient capacity is available and shall conform to the requirements for tensile strength specified in Table 3. When equipment of sufficient capacity for full-size bolt testing is not avail- able, or when the length of the bolt makes full-size testing impractical, machined specimens shall be tested and shall conform to the requirements specified in Table 4. 6.4 Grades A and B bolts and studs less than three diameters in length or bolts with drilled or undersize heads are not subject to tensile tests. 6.5 In the event that bolts are tested by both full size and by machine test specimen methods, the full-size test  shall govern if a controversy between the two methods exists. 6.6 For bolts and studs on which both hardness and tension tests are performed, acceptance based on tensile requirements shall take precedence in the event that there is controversy over low readings of hardness tests. 7. Dimensions 7.1 Unless otherwise specified, threads shall be the Coarse Thread Series as specified in the latest issue of ASME B1.1, and shall have a Class 2A tolerance. 7.2 Unless otherwise specified, Grade A bolts shall be hex bolts with dimensions as given in the latest issue of ASME B18.2.1. Unless otherwise specified, Grade B bolts shall be heavy hex bolts with dimensions as given in the latest issue of ASME B18.2.1.