tailieunhanh - Standard Specification for Grade 80 Alloy Steel Chain

"Standard Specification for Grade 80 Alloy Steel Chain" covers Grade 80 heat-treated alloy steel chain for such applications as slings, lifting assemblies, and load binding. The Grade designation is 1⁄10 of the minimum breaking strength in newtons divided by two times the nominal cross-sectional area of the chain in square millimetres. | Designation A391 A391M 07 Reapproved 2012 Standard Specification for Grade 80 Alloy Steel Chain1 This standard is issued under the fixed designation A391 A391M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. 1. Scope date code n series of letters numbers or both This specification covers Grade 80 heat-treated alloy embossed on the chain which enables its manufacturing history steel chain for such applications as slings lifting assemblies to be traced. and load binding. lot n for the purpose of acceptance testing a lot shall consist of 3000 ft 1000 m or fraction thereof of the same NOTE 1 This specification does not cover alloy steel chain for pocket wheel applications. grade and size chain. If a continuous length of chain exceeds 3000 ft 1000 m it shall also be considered a lot. The Grade designation is 1 10 of the minimum breaking strength in newtons divided by two times the nominal cross- proof test n quality control tensile test applied to sectional area of the chain in square millimetres. chain for the purpose of verifying weld and material quality. Discussion It is the minimum force in pounds or The values stated in either SI units or in other units shall newtons which the chain has withstood at the time it left the be regarded separately as standard. The values stated in each producer under a test in which a constantly increasing force system may not be exact equivalents therefore each system has been applied in direct tension to a straight length of chain. must be used independently of the other without combining Proof test loads are a manufacturing integrity test and shall not values in any way. be used as criteria for service or design purposes. 2. Referenced Documents .