GB/T 30026-2021Round steel short link chains for lifting purposes - Fine tolerance hoist chains for hand operated chain hoists - Grade TH (English PDF)

1 Scope

This document specifies the technical requirements for TH-level high-precision hoist chains (hereinafter referred to as hoist chains) for manual chain hoists. The chain is

The round steel short link chain that has been welded, heat treated and tested, and meets the general acceptance rules specified in ISO 1834.

Note 1.The letter "T" indicates the grade, which conforms to ISO 1834.

Note 2.The letter "H" indicates that this type of hoist chain is only suitable for manual hoists.

Note 3.ISO 4063 specifies the definition of resistance welding and flash butt welding.

This document is applicable to high-precision hoist chains with a nominal size of 3mm~13mm and an ambient temperature of -10°C~200°C.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

ISO 148-1 Charpy Pendulum Impact Test of Metallic Materials Part 1.Test Method (Metalicmaterials-Charpy pendulumimpacttest-Part 1.Testmethod)

ISO 497 preferred number and preferred number of integer series selection guide (Guidetothechoiceofseriesofpreferrednum- bersandofseriescontainingmoreroundedvaluesofpreferrednumbers)

ISO 643 Steel-Micrographic determination of the apparent grain size of steel apparentgrainsize)

ISO 1834 General Rules for Acceptance of Shortlink Chains for Lifting Purposes (Shortlinkchainforliftingpurposes-Generalconditionsof acceptance)

ISO 6507-1 Vickers hardness test of metallic materials Part 1.Test method (Metalicmaterials-Vickers hardnesstest-Part 1.Testmethod)

ISO 7500-1 Verification of static uniaxial testing machine Part 1.Inspection and calibration of force measurement system of tensile (or compression) testing machine (Metalicmaterials-Verificationofstaticuniaxialtestingmachines-Part 1.Tension/compression testingmachines-Verificaioandcalibrationoftheforce-measuringsystem)

ISO 14556 Steel Charpy V-Notch Pendulum Impact Test Instrumental Test Method (Steel-CharpyV-notch pendulumimpacttest-Instrumentedtestmethod)

3 Terms and definitions

The following terms and definitions defined by ISO 1834 apply to this document.