BS ISO 1835:2018 pdf free.Round steel short link chains for lifting purposes一Medium tolerance sling chains – Grade 4, stainless steel.
The bases for calculation of the values for the dimensions listed in Table 1 are given in Annex A.
The bases for calculation of the values for the mass per metre listed in Table B.1 are given in Annex B.
The nominal diameter, dn, of the sling chain corresponds to the nominal diameter of the steel wire as presented in ISO 16124, or bar as presented in ISO 1035-1, from which the sling chain is made.Preferred nominal diameters are given in Table 1 column 1. Other nominal diameters may be used, provided the corresponding dimensions and tolerances are calculated in accordance with Annex A.
The sling chain shall comply with the requirements of ISO 1834 as well as those of this document.
5.2 Material
The steel used shall be austenitic stainless steels with molybdenum and shall be resistant against intergranular corrosion, for example the steel with the ISO name X6CrNiMoTi17-12-2 and the ISO number 4571-316-35-I according to ISO 15510.
After solution annealing intergranular corrosion is unlikely at a service temperature of +400 °C and with an extra low carbon content of the steel. To avoid this corrosive attack under severe service conditions and with higher carbon contents of the steel, a stabilization with titanium Is recommended.
NOTE I The resistance against pitting corrosion can be increased by alloying with molybdenum.
NOTE 2 According to ISO 15510 (see Table A.1), the above-mentioned stainless steel is also well known under the number S31635, where 35 means titanium added. Internationally equivalent numbers of the steel are X6CrNiMoTi17.12.2; 1.4571;AISI/SAE 316Ti and tiNS S31635.
5.3 Heat treatment
All sling chains shall be solution annealed within a temperature range of 1 020 °C to 1 120 °C according to ISO 16143-2 and cooled rapidly by water before being subjected to the manufacturing proof force (MPF).
5.4 Surface condition
For an enhanced corrosion resistance, the sling chains shall be pickled after heat treatment to get a constant smooth surface.
NOTE An improved corrosion resistance and smooth surface condition require the passivation of the surface by pickling after heat treating.
5.5 Dimensions
5.5.1 Diameter The dimensions and tolerances for the diameter, d. shall be as given in Table 1. columns 1 and 2 calculated in accordance with Annex A.
5.5.2 Pitch The dimensions and tolerances for the pitch, p. shall be as given in Table 1. columns 3 and 4 calculated in accordance with Annex A.BS ISO 1835 pdf download.
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