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WELDED STEEL CHAIN SPECIFICATIONS - Fehr

WELDED STEEL CHAINSPECIFICATIONSA dopted April 26, 2003by theNational Association of CHAIN ManufacturersNACM WELDED STEEL CHAIN SPECIFICATIONSA doptedApril 26, 20032 Use and Performance LimitationThese size and related SPECIFICATIONS are applicable to CHAIN in proper physical condition usedat or below the working load limit in normal use conditions involving use in certain environmental situations such as unusual (high or low)temperature, chemical, etc., can cause changes in CHAIN performance. Sudden application ofdynamic loads, which cause the load in the CHAIN to exceed the working load limit, are to beavoided. Individual manufacturers will provide information and recommendations concerningthose conditions most likely to cause document has been developed by the National Association of CHAIN Manufacturers(NACM) in accordance with its objectives. NACM, its members, and those participating in itsactivities shall not incur any obligation or liability for injury or damages, including consequentialdamages, arising out of or in connection with the use, interpretation of, or reliance on thisdocument.

Nickel must be present in an alloying amount (0.40% min.), and at least one of the following elements must be present in an alloying amount: Chromium (0.40% min.) or ... 5.3.4 Elongation shall not be less than 20% for Grades 80 and 100; 15% for Grades 30, 43, ... or corrosion resistance unless the customer specifies otherwise.

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  Resistance, Corrosion, Nickel, Less, Corrosion resistance

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Transcription of WELDED STEEL CHAIN SPECIFICATIONS - Fehr

1 WELDED STEEL CHAINSPECIFICATIONSA dopted April 26, 2003by theNational Association of CHAIN ManufacturersNACM WELDED STEEL CHAIN SPECIFICATIONSA doptedApril 26, 20032 Use and Performance LimitationThese size and related SPECIFICATIONS are applicable to CHAIN in proper physical condition usedat or below the working load limit in normal use conditions involving use in certain environmental situations such as unusual (high or low)temperature, chemical, etc., can cause changes in CHAIN performance. Sudden application ofdynamic loads, which cause the load in the CHAIN to exceed the working load limit, are to beavoided. Individual manufacturers will provide information and recommendations concerningthose conditions most likely to cause document has been developed by the National Association of CHAIN Manufacturers(NACM) in accordance with its objectives. NACM, its members, and those participating in itsactivities shall not incur any obligation or liability for injury or damages, including consequentialdamages, arising out of or in connection with the use, interpretation of, or reliance on thisdocument.

2 NACM does not inspect, approve or certify products as complying with therequirements of this , 2003, National Association of CHAIN ManufacturersAll Rights WELDED STEEL CHAIN SPECIFICATIONSA doptedApril 26, 20033 NACM WELDED STEEL CHAIN WELDED STEEL CHAIN SPECIFICATIONS cover properties and grades of WELDED STEEL CHAIN for industrial and commercial usesproduced to accepted commercial tolerances. Special products such as sprocket CHAIN , pocket wheelchain, etc., are not covered by this specification. For specific applications, the user should consult themanufacturer for recommendations as to size and 100 Alloy ChainPremium quality, highest strength alloy CHAIN , heat treated, used in avariety of sling and tie down applications. For overhead liftingapplications, only Alloy CHAIN should be 80 Alloy ChainPremium quality, high strength alloy CHAIN , heat treated, used in a varietyof sling and tie down applications. For overhead lifting applications, onlyAlloy CHAIN should be 70 Transport ChainA high quality, high strength carbon STEEL CHAIN used for loadsecurement.

3 Not to be used in overhead 43 High Test ChainA carbon STEEL CHAIN widely used in industry, construction, agriculturaland lumbering operations. Not to be used in overhead 30 Proof Coil ChainGeneral purpose, carbon STEEL CHAIN . Used in a wide range ofapplications. Not to be used in overhead ChainShort pitch straight link or twist link, general utility CHAIN made of carbonsteel. Not to be used in overhead ChainLong pitch straight link or twist link, general utility CHAIN made of carbonsteel. Not to be used in overhead Link ChainShort, wide link CHAIN which resists kinking or tangling, made of carbonsteel. Not to be used in overhead STEEL ChainA corrosion -resistant CHAIN manufactured from stainless STEEL , used infood processing, chemical, marine, and high temperature Working Load Limit (WLL)The "Working Load Limit" (rated capacity) is the maximum load that shall be applied in direct tension toan undamaged straight length of Proof TestThe "Proof Test" (manufacturing test force) is a term designating the minimum tensile force which hasbeen applied to a CHAIN under a constantly increasing force in direct tension during the manufacturingprocess.

4 These loads are manufacturing integrity tests and shall not be used as criteria for service ordesign Minimum Breaking ForceThe "Minimum Breaking Force" is the minimum force at which the CHAIN during manufacture has beenfound by testing to break when a constantly increasing force is applied in direct tension. Breaking forcevalues are not guarantees that all CHAIN segments will endure these loads (see Section ). This test isa manufacturer's attribute acceptance test and shall not be used as a criterion for service or WELDED STEEL CHAIN SPECIFICATIONSA doptedApril 26, Overhead LiftingThat process of lifting that would elevate a freely suspended load to such a position that dropping the loadwould present a possibility of bodily injury or property OverloadAny static or dynamic load in excess of "Working Load Limit." MATERIALS AND Material Carbon ChainThe selection of the base STEEL is left to the judgment of the individual CHAIN manufacturer provided thesteel meets the following criteria: Carbon, max.

5 ; Phosphorous, max.; and Sulfur, Material Alloy ChainThe selection and amounts of the alloying elements in the STEEL are left to the judgment of the individualchain manufacturer provided the STEEL meets the following criteria: Carbon, max.; Phosphorous, max.; Sulfur, max. nickel must be present in an alloying amount ( min.), and atleast one of the following elements must be present in an alloying amount: Chromium ( min.) orMolybdenum ( min.). Material Stainless STEEL ChainThe material shall be a 300 series austenitic stainless Welding ProcessSteel CHAIN shall be made by electric welding or gas welding Manufacturing MethodsThe manufacturer will select suitable manufacturing methods such that the CHAIN complies with therequirements contained within this mechanical properties of the various CHAIN sizes and designations are given in Tables I through Selection of SamplesFor the purpose of acceptance testing of CHAIN , a lot shall consist of 3,000 ft.

6 (1,000 m) or fraction thereofof the same grade and size of CHAIN . If a continuous length of CHAIN exceeds 3,000 ft. (1,000 m), it is alsoconsidered a least one sample from each lot shall be tensile tested. If the original test specimen fails to conform tothe breaking force requirements as prescribed in Tables I through XI for their respective sizes, twoadditional test specimens from the same lot may be tested. If both additional test specimens conform tothe requirements specified, the lot of CHAIN will be considered : The elongation and breaking force tests may be performed at the same time on the same tests to determine breaking force and elongation shall be performed in the following breaking force test specimen shall consist of a length of CHAIN from any stage ofmanufacture after hardening and tempering, if applicable, and shall contain at least the numberof links in the following of ChainMinimum Number of Linksin Test mm or smaller9 Greater than mm but less than mm or greater3 NACM WELDED STEEL CHAIN SPECIFICATIONSA doptedApril 26, for securing CHAIN test specimen in testing machine must securely support shoulder slot width shall not exceed times the stock diameter being tested.

7 Links in the testingfixture shall not be considered part of the test CHAIN which is heat treated must be in the quenched and tempered conditionbefore elongation is elongation test specimen shall consist of a length from the lot containing at leastthe number of links in the Table in Section positive load not exceeding 10% of the proof test shall be applied for determiningthe original gauge length (LO). elongation shall be based on the total extension at fracture. This is expressedas a percentage of the change in length ( L) divided by the original gauge length(LO). The elongation may be determined by the equation below or by autographicrecorder or side (%) = { L / LO}x 100 Where L = The test specimen final length at fracture - the test specimen original gaugelength (LO).LO = The original gauge length (the sum of the inside lengths of the test CHAIN linksnot counting the fixture links, or as determined in ). shall not be less than 20% for Grades 80 and 100; 15% for Grades 30, 43, 70, andStainless; and 10% for Machine, Coil, and Passing Link dimensional requirements of the various CHAIN sizes and designations are given in Tables I throughXI.

8 The inside length dimension can be measured either by individual link or by measuring the span of100 links and dividing by diameter of the material from which the CHAIN is manufactured shall be the diameter as specified inTables I through XI within the following tolerances: -3% for Grades 80 and 100, -7% for all other material may be used for all Preparation for TestingTesting and inspection at a manufacturer's plant shall be performed on CHAIN while free of paint or othercoating which could conceal CertificationA certificate of proof test shall be issued by the CHAIN manufacturer to the purchaser or his representativewhen requested on the sales 43, 70, 80, 100 and 5/16" ( mm) and larger Grade 30 chains shall have periodic embossing foridentification purposes. The body links shall not be marked with indented WELDED STEEL CHAIN SPECIFICATIONSA doptedApril 26, " ( mm) and 3/8" (10 mm) Grade 43 and 70 CHAIN shall be embossed at intervals nogreater than 1 ft.

9 ( m). All other Grade 30, 43, 70, 80, and 100 chains shall be embossed atintervals no greater than 3 ft. ( m). " ( mm) and larger Grade 30 CHAIN shall be embossed at least with 3, 30 or 43 CHAIN shall be embossed at least with 4, 43, or 70 CHAIN shall be embossed at least with 7, 70 or 80 CHAIN shall be embossed at least with 8, 80, or 100 CHAIN shall be embossed at least with 10, 100, or , Coil, Passing Link, Stainless, and 1/4" (7mm) and smaller Grade 30 chains may be embossedat the option of the required, Stainless CHAIN shall be polished by a suitable mechanical, chemical, or electro-chemicalmethod. Mechanical polishing shall be done on equipment and with a process that does not allow non-stainless STEEL particles to be imbedded on the surface of the manufacturer may apply a surface treatment or coating of his or customer's choice for identificationor corrosion resistance unless the customer specifies WARNINGThe use of CHAIN is subject to certain hazards that cannot be met by mechanical means, but only by the exercise ofintelligence, care and common sense.

10 Serious hazards are: Overloading, dropping or slipping of the load causedby improper rigging, obstruction to free passage of the load, bending, twisting and the use of damaged CHAIN . Anysuch abuse or misuse may cause injury or property damage for which the manufacturer accepts no chains should be periodically inspected for wear, elongation, nicks, gouges, cracks, and suitability for theapplication. Excessive high or low temperatures or exposure to chemically active environments such as acids orcorrosive liquids or fumes can reduce the performance of the should not be used outside of the -40 F to 400 F (-40 C to 204 C) temperature range without consultingthe CHAIN manufacturer. The specific working load limit reductions for Grade 80 and Grade 100 chains used at andafter exposure to elevated temperatures have been established and are shown in Table XII. The specific workingload limit reductions for Stainless chains used at elevated temperatures have been established and are shown inTable criteria for wear and damage have also been established for the chains covered under specification, andare listed in Table XIV.


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