Home>ASTM Standards>ASTM A909-06(R2021) pdf free download

ASTM A909-06(R2021) pdf free download

ASTM A909-06(R2021) pdf free download.Standard Specification for Steel Forgings, Microalloy, for General Industrial Use
1. Scope
1.1 This specification covers wrought, microalloyed carbon steel forgings for industrial use. Microalloyed steels develop their properties by the addition of small amounts of microal- loying elements such as vanadium, columbium, titanium, or molybdenum. The properties may be influenced also by control of the hot working process and temperature and by control of the subsequent cooling rate. 1.2 The forgings shall be furnished to chemical composition and mechanical property requirements as specified herein. Chemical composition is based on standard carbon steel grades modified to include microalloying elements. Strength level is specified based on desired mechanical properties in the forg- ings. Depending on the forging process, different strength classes may be attainable from a single chemical composition. Conversely, mechanical properties of a given strength class may be achieved using different chemical compositions. The manufacturer should be consulted if development of chemical composition is necessary. 1.3 For the purpose of this specification, forgings with maximum section thickness of 4 in. [100 mm] are to be considered. 1.4 Supplementary Requirements S1 to S8 are provided for use when additional controls or requirements are desired. These shall apply only when specified on the purchase order. 1.5 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard. Within the text and tables, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.6 Unless the order specifies the applicable “M” specifica- tion designation, the material shall be furnished to the inch- pound units.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 microalloy forgings—forgings from microalloyed steels produced by effectively controlling the thermomechani- cal components of the forging process to achieve required mechanical properties with no post-forging heat treatment. 3.1.2 microalloy forging procedure—the written thermo- mechanical processing parameters to be followed during the production of a microalloy forging. It would include, but is not limited to: starting stock size; chemical composition, including any optional microalloying additions; reheat practice; forging temperature range; method of heating; cooling methods; and lot size definition.
4. Ordering Information
4.1 Orders for material supplied to this specification should include the information specified in 4.1 of Specification A788/ A788M. The purchaser should refer to Specification A788/ A788M for information not contained in this specification. 4.1.1 The type (see 6.1), grade (see 6.1), and the remainder of the chemical composition (see 6.2 to 6.5) should be included. 4.2 The information contained in 4.2 of Specification A788/ A788M should be specified, as necessary, to adequately describe the desired material. 4.3 In addition to the requirements of 4.1 and 4.2 of Specification A788/A788M, the following should be included in the purchase order, as applicable: 4.3.1 From Table 1, strength class or method of testing, or both, including test location on the forging. 4.3.2 Definition of lot size including the number of me- chanical tests to be performed per lot. 4.3.3 Any supplementary requirements.
6. Chemical Composition
6.1 Carbon, manganese, phosphorus, and sulfur analyses shall conform to the table on Grade Designations and Chemical Requirements of Hot-Wrought Carbon Steel Bars in Specifi- cation A576 for the grade specified, to such other limits that may be specified using the ranges and limits in the table on Grade Designations and Chemical Requirements of Hot- Wrought Carbon Steel Bars in Specification A576, or to the ranges and limits set forth in Table 1 of Specification A921/ A921M. N OTE 1—For improved machinability, alternative sulfur ranges may be specified by agreement between the purchaser and the producer. Addi- tional machinability-enhancing elements such as lead, bismuth, selenium, or tellurium may also be specified by agreement. 6.2 Silicon analysis shall be 0.15/0.35 %. Silicon content up to 0.80 % maximum may be furnished by agreement between purchaser and producer. 6.3 Vanadium, columbium (niobium), titanium, or molyb- denum may be specified singly or in combination, subject to the limits shown in Table 2. The elements and ranges specified shall be by agreement between the purchaser and the producer. 6.4 Nitrogen may be specified as a supplement to vanadium, columbium, or titanium. When nitrogen is specified as a supplement to vanadium, the minimum ratio of vanadium to nitrogen shall be 4 to 1. The nitrogen content shall not exceed 0.03 % and shall be reported. 6.5 Sampling for heat and product analysis shall be in accordance with the requirements of Specification A788/ A788M. Chemical Analyses shall be in accordance with Test Methods and Practices A751.

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