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ASTM
A391/A391M-21 Standard Specification for Grade 80 Alloy Steel Chain (Redline)
Edition: 2021
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Description of ASTM-A391/A391M 2021
ASTM A391/A391M-21
Redline Standard: Standard Specification for Grade 80 Alloy Steel Chain
ASTM A391/A391M
Scope
1.1 This specification covers Grade 80 heat-treated alloy steel chain for such applications as slings, lifting assemblies, and load binding. For overhead
lifting applications, only alloy chain should be used.
1.2 The chain grade is based on the nominal stress in the link at the design breaking force strength. It is calculated by taking the minimum breaking force
load and dividing by two times the nominal cross-sectional area of the link.
1.3 The values stated in either SI units or in other units are to be regarded separately as standard. 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.
1.3.1 Metric Units—Grade = 1/10 of the minimum breaking force in kilonewtons divided by
two times the nominal cross-sectional area in square millimeters. = (MBF)/(0.005)(Ï€)(d)(d)
1.3.2 English Units—Grade = 0.000689 of the minimum breaking force in pounds divided by two times the nominal
cross-sectional area in square inches. = (0.000689)(MBF)/(0.5)(Ï€)(d)(d)
1.3.3 MBF = minimum breaking force (lb or kN); d = chain diameter (in. or mm).
Note 1: The above formulas are for round diameter links only. If different cross sections
are used, the actual cross section of the link would need to be calculated and used.
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.
Keywords
alloy steel chain; chain; Grade 80; steel chain;
ICS Code
ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains)
DOI: 10.1520/A0391_A0391M-21
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