AASHTO M293-10 pdf free download

AASHTO M293-10 pdf free download.Hardened Steel Washers.
2. Add Sections 10.3 and 10.4 to Section 10 of ASTM F 436-09 as follows: 10.3 If zinc-coated washers are supplied, hardness testing shall be performed after zinc coating. The zinc coating shall be removed prior to taking hardness measurements. 10.4 If zinc-coated washers are supplied, the thickness of the zinc coating shall be measured. 3. Replace Section 14.1 of ASTM F 436-09 with the following: 14.1 The party responsible for the washers shall be the organization that supplies the washers to the purchaser. The responsible party shall supply test reports, certified by the manufacturer, that indicate the washers were manufactured, sampled, tested, and inspected in accordance with this specification and all of its requirements.
4. Materials and Manufacture
4.1 Steel used in the manufacture of washers shall be produced by the open-hearth, basic-oxygen, or electric-furnace process.
4.2 Washers up to and including 1 ‘/2 in. in bolt size shall be through hardened. Washers over 1 ½ in. may be either through hardened or carburized at the option of the manufacturer.
4.3 Zinc Coatings, Ho!- Dip and Mechanically Deposited, Zinc/Aluminium Corrosion Protective Coating:
4.3.1 When zinc-coated washers are required, the purchaser shall specify the zinc coating process, for example, hot-dip, mechanically deposited, Zinc/Aluminium Corrosion Protective Coating, or no preference.
4.3.2 When hot-dip is specified the washers shall be zinc coated by the hot-dip process in accordance with the requirements of Specification F2329.
4.3.3 When mechanically deposited is specified the washers shall be zinc coated by the mechanical-deposition process in accordance with the requirements of Class 55 of Specification
B695.
4.3.4 When Zinc/Aluminium Corrosion Protective Coating is specified, the washers shall be coated in accordance with the requirements of Grade 3 of Specification Fl 136.
4.3.5 When no preference is specified, the supplier may furnish either a hot-dip zinc coating in accordance with Specification F2329, or a mechanically deposited zinc coating in accordance with Specification B695, Class 55, or a Zinc/ Aluminium Corrosion Protective Coating in accordance with Specification Fl 1 36, Grade 3. Threaded components (bolt 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.
4.4 If washers are heat treated by a subcontractor, they shall be returned to the manufacturer for testing prior to shipment to the purchaser.
5. Chemical Composition
5.1 Type 1 and Type 3 washers shall conform to the chemical composition specified in Table 1. For Type 3 see Guide GlOl for methods of estimating corrosion resistance of low alloy steels.
5.2 Product analysis may be made by the purchaser from finished material representing each lot of washers. The chemical composition shall conform to the requirements of 4.1 and
5.1.
5.3 Individual heats of steel are not identified in the finished product.
5.4 Chemical analyses shall be performed in accordance with Test Methods, Practices, and Terminology A75 1.
6. Mechanical Properties
6.1 Through hardened washers shall have a hardness of 38 to 45 HRC, except when zinc-coated by the hot-dip process, in which case they shall have a hardness of 26 to 45 HRC.
6.2 Carburized washers shall be carburized to a minimum depth of 0.015 in. and shall have a surface hardness of 69 to 73 HRA or 79 to 83 HR15N, except when zinc-coated by the hot-dip process, in which case they shall have a hardness of 63 tO 73 HRA or 73 to 83 HRI5N.
6.3 Carburized and hardened washers shall have a minimum core hardness of 30 HRC or 65 HRA.AASHTO M293-10 pdf download.