ASTM A765-07(R2017) pdf free download

ASTM A765-07(R2017) pdf free download.Standard Specification for Carbon Steel and Low-Alloy Steel Pressure-Vessel- Component Forgings with Mandatory Toughness Requirements
1. Scope
1.1 This specification 2 covers heat-treated carbon steel and alloy steel forgings with mandatory toughness requirements. These forgings are intended for pressure vessels, feedwater heaters, and similar uses. 1.2 These forgings include tube sheets, covers, channel barrels, integral forged channels, rings, nozzles, flanges, and similar parts. 1.3 All grades are considered weldable under proper condi- tions. 1.4 The maximum thickness of forgings produced to this specification is limited only by the capacity of the selected grade to respond to any heat treatment specified and to meet the specified mechanical tests, including impact tests at the speci- fied temperature. 1.5 Material supplied to this specification shall conform to the requirements of Specification A788/A788M, which out- lines additional ordering information, manufacturing requirements, testing and retesting methods and procedures, marking, certification, product analysis variations, and addi- tional supplementary requirements. 1.6 If the requirements of this specification are in conflict with the requirements of Specification A788/A788M, the requirements of this specification shall prevail. 1.7 The values stated in either inch-pound units or SI [metric] units are to be regarded separately as the standard; within the text and tables, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently ofthe other. Combining values from the two systems may result in noncon- formance with the specification. 1.8 Unless the order specifies the applicable “M” specifica- tion designation, the material shall be furnished to the inch- pound units.
4. Heat Treatment for Mechanical Properties
4.1 Heat treatment shall consist of one of the following heat treatment options of the manufacturer’s choice. 4.1.1 Normalize and temper. 4.1.2 Double normalize, wherein the second austenitizing temperature is at the same or lower temperature than the first, followed by tempering. 4.1.3 Quench and temper, with the option of adding a preliminary normalize before austenitizing for quenching in a suitable liquid medium. The type ofcooling medium used shall be reported. 4.1.4 Use of an intercritical heat treatment cycle in accor- dance with Specification A788/A788M in which cooling from the full and partial austenitization stages may be done by liquid quenching or air cooling. The method of cooling and type of quench medium, if used, shall be reported. 4.1.5 The minimum tempering temperature shall be 1100 ºF [590 ºC].
5. Chemical Requirements
5.1 Heat Analysis—The heat analysis obtained from sam- pling in accordance with Specification A788/A788M shall comply with Table 1. 5.2 Product Analysis—The purchaser may use the product analysis provision of Specification A788/A788M to obtain a product analysis from a forging representing each heat or multiple heat.
6. Mechanical Requirements
6.1 General Requirements—The forgings shall conform to the tension test requirements ofTable 2. The forgings shall also conform to the impact test requirements of Table 3. The largest obtainable round tension test specimen as specified in Test Methods and Definitions A370 shall be used. Impact speci- mens shall be Charpy V-notch, Type A, as in Test Methods and Definitions A370. The usage ofsubsize impact specimens must have prior purchaser approval. 6.1.1 When agreed upon between the purchaser and the producer and specified on the order, impact tests may be made at temperatures different from those shown in Table 3 provided the test temperature is at least as low as the intended service temperatures and the provided impact energy requirements of Table 3 are met. Such forgings shall be suitably marked in accordance with 9.1 to identify the test temperature. 6.2 Test Location—Test coupons shall be taken so that the longitudinal axis and mid-length of tension and impact test specimens shall be positioned in accordance with one of the following methods: 6.2.1 Method 1—Forgings with 2 in. [50 mm] maximum thickness. The specimens shall have their longitudinal axis at the midthickness or the center of the cross section and with the midlength of the specimen at least 2 in. [50 mm] from any second surface.