Attention
Upon agreement with the customer chains of categories R3 and R3S may be subject to impact bending test at temperature of -20 °C. Maximum hardness for category R4S — 330 HB, for category R5 — 340 HB.
The chain is used in the anchor/mooring systems of offshore rigs and jetties with anchors. Offshore chains are manufactured by flash welding and are subject to stringent requirements to their strength characteristics, operation life, as well as resistance to environmental factors. Chains may be produced in single lengths up to 2 000 m.
Upon agreement with the customer chains of categories R3 and R3S may be subject to impact bending test at temperature of -20 °C. Maximum hardness for category R4S — 330 HB, for category R5 — 340 HB.
Supply form
Chains are produced in lengths according to the customer’s drawings.
Materials
Special alloy steel with additional heat treatment.
External coating
BIT – bitumen paint, 1 layer, ISO 12944-5
Standard
The product meets Class Rules including IACS design, construction and operation standards.
| Chain grade | R3 | R3S | R4 | R4S | R5 |
|---|---|---|---|---|---|
| Yield strength, N/mm², not less than | 410 | 490 | 580 | 700 | 760 |
| Ultimate tensile strength, MPa, not less than | 690 | 770 | 860 | 960 | 1000 |
| Contraction at break, %, not less than | 50 | 50 | 50 | 50 | 50 |
| Elongation at break, %, not less than | 17 | 15 | 12 | 12 | 12 |
| Impact bending test, KV, temperature 0 °C: | |||||
| Average impact energy, J, not less than, base metal | 60 | 65 | – | – | – |
| Average impact energy, J, not less than, weld metal | 50 | 53 | – | – | – |
| Impact bending test, KV, temperature -20 °C: | |||||
| Average impact energy, J, not less than, base metal | 40 | 45 | 50 | 56 | 58 |
| Average impact energy, J, not less than, weld metal | 30 | 33 | 36 | 40 | 42 |
Olga Sharonova