Round steel short link chains for general lifting purposes -- Medium tolerance sling chains for chain slings -- Grade 8

ISO 3076:2012 specifies the requirements for medium tolerance sling chains of grade 8 for use in chain slings and for general lifting purposes. They are round steel short link chains, electrically welded, heat treated and tested; they comply with the general conditions of acceptance of ISO 1834. The range of nominal sizes covered by ISO 3076:2012 is from 4 mm to 45 mm. They are for use in the temperature range of minus 40 °C to to plus 400 °C.

Chaînes de levage général en acier, de section ronde, à maillons courts -- Chaînes de tolérance moyenne pour élingues -- Classe 8

General Information

Status
Published
Publication Date
17-Jun-2012
Current Stage
6060 - International Standard published
Start Date
16-May-2012
Completion Date
18-Jun-2012
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ISO 3076:2012 - Round steel short link chains for general lifting purposes -- Medium tolerance sling chains for chain slings -- Grade 8
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INTERNATIONAL ISO
STANDARD 3076
Third edition
2012-06-15
Round steel short link chains for general
lifting purposes — Medium tolerance
sling chains for chain slings — Grade 8
Chaînes de levage général en acier, de section ronde, à maillons
courts — Chaînes de tolérance moyenne pour élingues — Classe 8
Reference number
ISO 3076:2012(E)
ISO 2012
---------------------- Page: 1 ----------------------
ISO 3076:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s

member body in the country of the requester.
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Published in Switzerland
ii © ISO 2012 – All rights reserved
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ISO 3076:2012(E)
Contents Page

Foreword ............................................................................................................................................................................iv

1 Scope ...................................................................................................................................................................... 1

2 Normative references ......................................................................................................................................... 1

3 Terms and definitions ......................................................................................................................................... 1

4 General conditions of acceptance .................................................................................................................. 1

5 Dimensions ........................................................................................................................................................... 1

5.1 Nominal size, d .................................................................................................................................................. 1

5.2 Material diameter and tolerance ...................................................................................................................... 3

5.3 Weld diameter ....................................................................................................................................................... 4

5.4 Length dimensionally affected by welding ................................................................................................... 4

5.5 Pitch ........................................................................................................................................................................ 4

5.6 Width ....................................................................................................................................................................... 4

6 Material and manufacture ................................................................................................................................. 4

6.1 Quality of material ............................................................................................................................................... 4

6.2 Heat treatment ...................................................................................................................................................... 5

6.3 Working load limits (WLLs) .............................................................................................................................. 5

6.4 Mechanical properties ........................................................................................................................................ 6

7 Verification of safety requirements ..............................................................................................................10

7.1 Size of lot and selection of samples ............................................................................................................10

7.2 Manufacturing proof force, breaking force and total ultimate elongation .........................................10

7.3 Bend deflection ..................................................................................................................................................10

7.4 Toughness of chain test material .................................................................................................................. 11

8 Marking .................................................................................................................................................................12

8.1 Grade marking ....................................................................................................................................................12

8.2 Identification marking ......................................................................................................................................12

8.3 Inspection marking ...........................................................................................................................................12

9 Manufacturer’s certificate ...............................................................................................................................12

Annex A (informative) Bases for calculation .............................................................................................................13

Annex B (informative) Mass of sling chains ..............................................................................................................16

Annex C (informative) Designation system ...............................................................................................................17

Bibliography .....................................................................................................................................................................18

© ISO 2012 – All rights reserved iii
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ISO 3076:2012(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International

Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 3076 was prepared by Technical Committee ISO/TC 111, Round steel link chains, chain slings, components

and accessories, Subcommittee SC 1, Chains and chain slings.

This third edition cancels and replaces the second edition (ISO 3076:1984), which has been technically revised.

iv © ISO 2012 – All rights reserved
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INTERNATIONAL STANDARD ISO 3076:2012(E)
Round steel short link chains for general lifting purposes —
Medium tolerance sling chains for chain slings — Grade 8
1 Scope

This International Standard specifies the requirements for medium tolerance sling chains of grade 8 for use in

chain slings and for general lifting purposes.

They are round steel short link chains (3 d ), electrically welded, heat treated and tested; they comply with the

general conditions of acceptance of ISO 1834.
NOTE 1 Butt welding and flash butt welding are listed in ISO 4063.

The range of nominal sizes covered by this International Standard is from 4 mm to 45 mm. They are for use in

the temperature range –40 °C to +400 °C.

NOTE 2 Concerning the use and maintenance of chain slings of grade 8, see ISO 3056.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced document

(including any amendments) applies.

ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method

ISO 643, Steels — Micrographic determination of the apparent grain size
ISO 1035-1, Hot-rolled steel bars — Part 1: Dimensions of round bars

ISO 1834, Short link chain for lifting purposes — General conditions of acceptance

ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compression

testing machines — Verification and calibration of the force-measuring system

ISO 14556, Steel — Charpy V-notch pendulum impact test — Instrumented test method

ISO 16124, Steel wire rod — Dimensions and tolerances
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1834 apply.

4 General conditions of acceptance

The sling chains shall comply with the requirements of ISO 1834 as well as those of this International Standard.

5 Dimensions
5.1 Nominal size, d

The nominal size, d , of the sling chain shall be one of the nominal sizes listed in Table 1, column 1, corresponding

to the nominal diameter of the steel wire in accordance with ISO 16124 or bar in accordance with ISO 1035-1

from which the sling chain is made.
© ISO 2012 – All rights reserved 1
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ISO 3076:2012(E)

Other nominal sizes may be used, provided the dimensions and tolerances are calculated in accordance

with Annex A.

NOTE Intermediate nominal chain sizes increase the potential of mismatch with mating components. Manufacturers

of sling chain and component assemblies are expected to ensure that the sling chain and components are compatible.

Table 1 — Dimensions
Dimensions in millimetres
1 2 3 4 5 6 7 8 9
Nominal Diameter Pitch Width Weld diameter
size tolerance
Internal External Internal
Tolerance Type 2 Types 1 Type 1 Types 1 Type 2
and 2 and 2
d p w w w d G
n n 1 3 4 w
min. max. min. max. max.
4 +0,08/–0,24 12 ±0,4 5,0 14,8 5,2 4,4 5,0
6 +0,12/–0,36 18 ±0,5 7,5 22,2 7,8 6,6 7,5
7 +0,14/–0,42 21 ±0,6 8,8 25,9 9,1 7,7 8,8
8 +0,16/–0,48 24 ±0,7 10,0 29,6 10,4 8,8 10,0
10 +0,20/–0,60 30 ±0,9 12,5 37,0 13,0 11,0 12,5
13 +0,26/–0,78 39 ±1,2 16,3 48,1 16,9 14,3 16,3
16 +0,32/–0,96 48 ±1,4 20,0 59,2 20,8 17,6 20,0
18 ±0,9 54 ±1,6 22,5 66,6 23,4 19,8 22,5
19 ±0,95 57 ±1,7 23,8 70,3 24,7 20,9 23,8
20 ±1,0 60 ±1,8 25,0 74,0 26,0 22,0 25,0
22 ±1,1 66 ±2,0 27,5 81,4 28,6 24,2 27,5
26 ±1,3 78 ±2,3 32,5 96,2 33,8 28,6 32,5
28 ±1,4 84 ±2,5 35,0 104,0 36,4 30,8 35,0
32 ±1,6 96 ±2,9 40,0 118,0 41,6 35,2 40,0
36 ±1,8 108 ±3,2 45,0 133,0 46,8 39,6 45,0
40 ±2,0 120 ±3,6 50,0 148,0 52,0 44,0 50,0
45 ±2,25 135 ±4,1 56,3 167,0 58,5 49,5 56,3
2 © ISO 2012 – All rights reserved
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ISO 3076:2012(E)
a) Type 1
b) Type 2
Key
p pitch (internal link length)
d measured diameter of the material, except at the weld

d measured diameter of the material at the weld (type 1) or weld dimension perpendicular to the plane of the link

(type 2)
G dimension in other planes (type 2)
e length affected by welding, on either side of the centre of the link
w internal link width away from the weld (type 2)
w external link width over the weld (types 1 and 2)
w internal link width at the weld (type 1)
Figure 1 — Chain link
5.2 Material diameter and tolerance

The definition of material diameter and method of measurement shall be in accordance with ISO 1834. The diameter

tolerance for the nominal sizes shall be as listed in Table 1, column 2, calculated in accordance with Annex A.

© ISO 2012 – All rights reserved 3
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ISO 3076:2012(E)
5.3 Weld diameter

The maximum diameter at the weld (see Figure 1 and Table 1, columns 8 and 9) shall not exceed the following:

— type 1: the maximum diameter at the weld shall not be in excess of 10 % above the nominal size in any direction;

— type 2: the maximum diameter at the weld shall not be in excess of 10 % above the nominal size in any

direction perpendicular to the plane of the link and 25 % in the other planes.

NOTE Type 1 eliminates functional problems, such as kinking or locking, by severely limiting the weld oversize to

10 % of the nominal diameter. Type 2 ensures freedom from these hazards by limiting the oversize beyond the 10 %

allowed under type 1 to certain areas of the link only (see Figure 1), thus providing clearance where required.

5.4 Length dimensionally affected by welding

The length dimensionally affected by welding, e, shall not extend by more than 0,6 d to either side of the centre

of the link (see Figure 1).
5.5 Pitch

The dimensions and tolerances for the pitch, p, shall be as given in Table 1, columns 3 and 4 and as shown in

Figure 1 calculated in accordance with Annex A.
5.6 Width

The dimensions for the widths, w, shall be as given in Table 1, columns 5, 6 and 7 and as shown in Figure 1

calculated in accordance with Annex A.
6 Material and manufacture
6.1 Quality of material

Within the limitations given in 6.1.1 to 6.1.4, it is the responsibility of the manufacturer of the sling chain to select

the type of steel to be used so that the finished sling chain, where suitably heat treated, complies with the

mechanical properties specified in this International Standard and also possesses adequate low-temperature

ductility and toughness to provide resistance against impact loading.

The low-temperature ductility and toughness shall be achieved either by complying with the alloying elements

specified in 6.1.5 or by complying with the toughness-testing requirements specified in 6.4.5.

6.1.1 Type of steel

The steel used shall be produced by the electric process or by an oxygen-blown process.

6.1.2 Deoxidation

The steel shall be fully killed and shall be made in conformity with a suitable deoxidation process in order to

obtain an austenitic grain size of 6 or finer where tested in accordance with ISO 643.

To ensure the sling chain is stabilized against strain-age embrittlement during service, the steel shall contain

at least 0,025 % aluminium, but not more than 0,050 % aluminium.
6.1.3 Weldability
The steel shall be of reliable weldable quality.
4 © ISO 2012 – All rights reserved
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ISO 3076:2012(E)
6.1.4 Sulfur and phosphorus content

The content of sulfur and phosphorus shall be restricted as specified in Table 2.

Table 2 — Sulfur and phosphorus content
Maximum mass content as determined by
cast analysis check analysis
Element
% %
Sulfur 0,020 0,025
Phosphorus 0,020 0,025
Sum of sulfur and phosphorus 0,035 0,045
6.1.5 Alloying elements

The steel shall contain alloying elements in sufficient quantities so that the finished sling chain, where heat

treated in accordance with 6.2, complies with the mechanical properties specified in this International Standard

but also possesses adequate low-temperature ductility and toughness to provided resistance to impact loading.

The steel shall contain nickel and at least one of the other elements in the minimum percentage shown in Table 3.

Table 3 — Content of alloying elements
Minimum mass content as determined by
Element cast analysis
Nickel 0,40
Chromium 0,40
Molybdenum 0,15
6.1.6 Finished condition

In its finished condition, as supplied to the manufacturer of the sling chain, the steel shall comply with the

requirements of 6.1.1 to 6.1.4 and 6.1.5, where appropriate, as determined by check analysis on the rod, wire

or finished link.
6.2 Heat treatment

Sling chains shall be hardened from a temperature above the Ac point and tempered before being subjected

to the manufacturing proof force (MPF), F . The tempering temperature shall be at least + 400 °C.

The tempering conditions shall be at least as effective as the temperature of + 400 °C maintained for a

...

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