ASTM A743-2019 pdf free download

ASTM A743-2019 pdf free download.Standard Speci fication for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
1. Scope
1.1 This specification covers iron-chromium and iron- chromium-nickel alloy castings for general corrosion-resistant application. The grades covered by this specification represent types of alloy castings suitable for broad ranges of application which are intended for a wide variety of corrosion environ- ments. N OTE 1—For alloy castings for severe corrosion-resistant service, reference should be made to Specification A744/A744M. For general heat-resistant alloy castings, reference should be made to Specification A297/A297M. For nickel alloy castings for corrosion-resistant service, reference should be made to Specification A494/A494M. 1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specifi- cation. Inch-pound units are applicable for material ordered to Specification A743 and SI units for material ordered to Specification A743M. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. General Conditions for Delivery
3.1 Except for investment castings, castings furnished to this specification shall conform to the requirements of Speci- fication A781/A781M, including any supplementary require- ments that are indicated on the purchase order. Failure to comply with the general requirements of Specification A781/ A781M constitutes nonconformance with this specification. In case of conflict between the requirements of this specification and Specification A781/A781M, this specification shall pre- vail. 3.2 Steel investment castings furnished to this specification shall conform to the requirements of Specification A957/ A957M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of Specification A957/A957M consti- tutes nonconformance with this specification. In case of con- flict between the requirements of this specification and Speci- fication A957/A957M , Speci fication A957/A957M shall prevail.
8. Repair by Welding
8.1 Repair welding of Grade CA28MWV is not permitted unless by agreement between the manufacturer and the pur- chaser. 8.2 When methods involving high temperature are used in the removal of discontinuities, castings shall be preheated in accordance with Table 3. Weld repairs shall be subject to the same quality standards as are used to inspect the castings. 8.3 Post-weld heat treatment, if required, shall be in accor- dance with Table 1. 8.3.1 The martensitic grades CA6NM， CA15，CA15M, CB6, and CA40 shall be retempered after weld repairing,except that local tempering will be permitted if, in the opinion of the manufacturer, furnace heat treating will be damaging to the finished surface of a machined casting. Heat treatment, other than tempering， of grades CA6NM， CA15， CA15M， CB6, and CA40 after weld repairing shall be performed only when agreed upon between the manufacturer and the pur- chaser. Weld repair on Grade CA40F is not recommended because of the risk of local hardening and possible cracking in the heat-affected zone. 8.3.2 Post-weld heat treatment is not required on the other grades of this specification. When post-weld heat treatment is believed necessary for adequate corrosion resistance in the service environment, castings should be ordered in accordance with Specification A744/A744M. 8.3.3 For Grade HG10MNN, the filler metal to be used shall be established by mutual agreement between the manufacturer and the purchaser.