ISO 3077:2001 pdf download

ISO 3077:2001 pdf download.Short-link chain for lifting purposes 一Grade T, (types T, DAT and DT), fine-tolerance hoist chain.
5.3 Pitch and widths
The dimensions and tolerances of the pitch and widths of the individual links as shown in Figure 1 shall be calculated in accordance with A.2.
The tolerances of multiple pitch lengths shall be calculated in accordance with A.2 and based on a gauge length of 11 links.
The dimensions and tolerances for the selected nominal sizes shall be as given in Table 1.
The nominal link pitch, p, is based upon 3 4, where 4 is the nominal size of the chain. This may be varied up to a maximum of 3,2 d. Nominal link pitch In shall be subject to the tolerances specified in annex A.
5.4 Weld diameter
The maximum diameter at the weld shall not be in excess of 8 % above the nominal diameter in any direction. The maximum diameter at the weld for the selected nominal sizes shall be as given in Table 1. The diameter of the steel at the weld shall nowhere be less than the actual diameter of the steel adjacent to the weld.
5.5 Length dimensionally affected by welding
The length dimensionally affected by welding shall not extend by more than 0,6 4 on either side of the centre of the link (see Figure 1).
6 Material and manufacture
6.1 Quality of material
6.1.1 Manufacturer’s responsibility
Within the limitations given in 6.1.2 to 6.1.5, it shall be the responsibility of the chain maker to select the type of steel to be used so that the finished chain, when suitably heat-treated, complies with the mechanical properties specified in this International Standard.
6.1.2 Type of steel
The steel used shall be produced by the electric process or by an oxygen-blown process.
6.1.3 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 5 or finer when tested in accordance with ISO 643.
6.1.4 Chemical composition
The steel shall contain alloying elements in sufficient quantities so that the finished chain, when heat-treated in accordance with 6.2, complies not only with the mechanical properties specified in this International Standard but also possesses a low temperature ductility and toughness adequate for providing resistance to impact loading.
The steel shall contain nickel and at least one of the other elements in the minimum percentages shown in Table 2.
7.2.2.1 MPF
All chain shall be subject to the manufacturing proof force specified in 6.4.1.
7.2.2.2 BF and A
On completion of the static tensile test, the requirements of 6.4.2 shall have been met.
7.3 Bend deflection
7.3.1 Bend test
The test equipment and procedure shall be as specified in ISO 1834.
Each single link sample of type T shall be bent by a deflection, /, as given in Table 6 and shown in Figure 2. Single link samples of types DAT and DT shall be correspondingly loaded with force F0. Following the removal of the force, the link sample shall be examined by a competent person.
Where necessary, a surface coating may be removed after the bend test to enable this examination to be carried out.
7.3.2 Acceptance criteria
On completion of the bend test, the requirements of 6.4.3 shall have been met.
7.4 Hardness test
The number of samples for surface hardness testing shall be related to chain size as specified in ISO 1834 and each sample shall consist of three single links.
Each sample link shall be subjected to surface hardness testing carried out in accordance with ISO 6507-1, with measurements taken at three points as shown in Figure 3, below.
Special jigging shall be used to ensure that the curvature of the link surface does not affect the validity of the measurements taken. Each result shall meet the requirements of 6.4.4.