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Norma ASTM A744/A744M-21a 1.11.2021 náhled

Doplňující informace

ASTM A744/A744M-21a

Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service (Includes all amendments and changes 11/10/2021).

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NORMA vydána dne 1.11.2021

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Informace o normě:

Označení normy: ASTM A744/A744M-21a
Datum vydání normy: 1.11.2021
Kód zboží: NS-1041937
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM

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Anotace textu normy ASTM A744/A744M-21a :

This specification covers standard requirements for iron-chromium-nickel alloy, stainless steel castings intended for particularly severe corrosive applications. Alloys shall be melted by the electric furnace process with or without refining such as argon-oxygen-decarburization. Castings shall be heat treated and shall conform to the required heat treatment conditions. The materials shall conform with the prescribed chemical requirements for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, columbium, copper, selenium, tungsten, vanadium, iron, and nitrogen.

Keywords:

austenitic stainless steel, corrosion, stainless steel, steel castings,, ICS Number Code 77.140.80 (Iron and steel castings)

Doplňující informace

1. Scope

1.1?This specification covers iron-chromium-nickel alloy stainless steel castings intended for particularly severe corrosive applications.

1.2?This specification requires post-weld heat treatment of all weld repairs affecting surfaces intended to be wetted by the corrosive medium. For applications for which post-weld heat treatment is not considered mandatory for retention of acceptable corrosion resistance, refer to Specification A743/A743M.

Note 1:?For general corrosion-resistant alloy castings, reference should be made to Specification A743/A743M. For general heat-resistant alloy castings, reference should be made to Specification A297/A297M. For nickel-base alloy castings, refer to Specification A494/A494M.

1.3?The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.3.1?Within the text, the SI units are shown in brackets.

1.3.2?Inch-pound units are applicable for material ordered to Specification A744 and SI units for material ordered to Specification A744M.

1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents

A262-15(2021)	Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A297/A297M-21a	Standard Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application (Includes all amendments and changes 9/17/2021).
A370-23	Standard Test Methods and Definitions for Mechanical Testing of Steel Products
A494/A494M-22	Standard Specification for Castings, Nickel and Nickel Alloy
A732/A732M-20	Standard Specification for Castings, Investment, Carbon and Low-Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
AWS?A5.14	Specification for Nickel and Nickel Alloy Bare Welding Rods and Electrodes
A743/A743M-21	Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
A781/A781M-21	Standard Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A957-05	Standard Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
E29-22	Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
AWS?A5.11	Specification for Nickel and Nickel Alloy Covered Welding Electrodes

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