Grade 80 chains feature a minimum breaking force of 80 Kp/mm2.
Vicinay Cemvisa’s High Resistance Grade 80 chains are made of high quality alloy steel precisely treated to provide a superior combination of strength, lightness and durability.
Grade 80 chains manufacturing process starts from a high resistance steel wire rod that goes through a cutting (to the appropriate link size), bending, crimping, welding, heat treatment, load proof and final visual and tensile testing automatic line.
The heat treatment is a quenching and tempering process after which the chain reaches 400 Brinell hardness.
TESTS PROCEDURES.
All the chains are verified at our facilities throughout the entire manufacturing process, making the most comprehensive tests and both visual and dimensional controls in compliance with their manufacturing standards.
After heat treatment the whole chain is subjected to the proof load , which is two and half times safe working load.
Subsequently representative samples taken from each production batch are subjected to tensile strength tests whose results are collected in stress-strain graphs. At the same time the elongation at break is also verified: chains are perceptibly lengthened prior to failure, which indicates load limits have been exceeded.
Both load test certificates and tensile strength test certificates showing elongation data are issued with each delivered chain.
MANUFACTURING RANGE.
Vicinay Cemvisa manufactures a wide range of grade 80 chains of different formats and sizes to serve different markets and applications.
We offer the following range:
- Short link chains (3xd). The inside length of the link is three times the nominal diameter of the steel from which the chain is manufactured. This kind of chain is commonly used for industrial applications (slings and hoists) , forestry, mines and others.
- Mid link chains (4xd) are usually directed to mining and fishing.
- Long link chains (5xd or 6xd) extensively used in the fishing field or for lashing purposes.
- Other special chains under request.
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