Menu
Close
Anchor Chain Casting Steel, encompassing both mooring chain steel and marine anchor chain round steel, is essential for maritime and offshore operations. Mooring chains serve a critical role in securing sea-based structures like ships and floating platforms to the seabed, ensuring they remain in the desired position despite environmental forces. This steel is indispensable in various marine and offshore applications, including floating production systems, semi-submersible drilling platforms, single-point mooring systems, and floating production storage and offloading units (FPSO).
High Strength and Toughness:ย Given the harsh operating conditions, anchor chain casting steel must exhibit exceptional strength and toughness to withstand the dynamic loads and stresses encountered in marine environments.
Corrosion Resistance:ย Prolonged exposure to seawater necessitates superior resistance to corrosion, ensuring longevity and reliability.
Fatigue and Wear Resistance:ย The steel must resist fatigue and wear caused by continuous cyclic loading and abrasive conditions.
Good Cold Bending and Welding Performance:ย To accommodate the manufacturing process, which involves bending the steel into rings, the material must retain its integrity without cracking or deforming. Additionally, excellent weldability is crucial for joining the steel components securely.
Anchor chain casting steel finds extensive application in various marine and offshore sectors:
Floating Production Systems:ย Used in floating production, storage, and offloading (FPSO) units, anchor chain steel ensures the stability and safety of these critical structures, which are pivotal in offshore oil and gas extraction.
Semi-Submersible Drilling Platforms:ย These platforms rely on high-strength mooring chains made from anchor chain steel to maintain their position during drilling operations, even in rough seas.
Single-Point Mooring (SPM) Systems:ย Anchor chain steel is crucial in SPM systems, which allow for the mooring of large tankers, ensuring they remain securely anchored during loading and unloading operations.
Marine Vessels:ย Anchor chain steel is used in the construction of anchor chains for ships, providing the necessary strength and durability to anchor vessels securely.
A significant application of anchor chain casting steel is in the development of mooring systems for FPSOs in the North Sea. These systems must endure extremely harsh conditions, including high waves, strong currents, and corrosive seawater. By utilizing R4 grade anchor chain steel, the mooring systems have demonstrated superior performance, ensuring the safety and stability of the FPSOs over extended service periods.
| Strength Grades and Codes of Mooring Chain Steel | |
| Tensile Strength/MPa | Levelsย and Codes |
| โฅ690 | R3 |
| โฅ770 | R3S |
| โฅ860 | R4 |
| โฅ960 | R4S |
| โฅ1000 | R5 |
The production of anchor chain casting steel involves several meticulous steps to meet the stringent requirements:
Material Selection and Steelmaking:ย High-quality raw materials are selected to produce steel with the desired chemical composition. This is achieved through advanced steelmaking techniques in basic oxygen furnaces or electric arc furnaces.
Hot Rolling:ย The steel is hot-rolled into round bars with diameters ranging from ร30mm to ร250mm. This process imparts the necessary mechanical properties and ensures a uniform microstructure.
Heat Treatment:ย To enhance the steelโs strength, toughness, and corrosion resistance, it undergoes precise heat treatments such as quenching and tempering.
Quality Control and Testing:ย Rigorous testing, including tensile tests, impact tests, and non-destructive testing, is conducted to ensure the steel meets national and international standards like GB/T 32969-2016.
Anchor chain casting steel finds extensive application in various marine and offshore sectors:
Floating Production Systems:ย Used in floating production, storage, and offloading (FPSO) units, anchor chain steel ensures the stability and safety of these critical structures, which are pivotal in offshore oil and gas extraction.
Semi-Submersible Drilling Platforms:ย These platforms rely on high-strength mooring chains made from anchor chain steel to maintain their position during drilling operations, even in rough seas.
Single-Point Mooring (SPM) Systems:ย Anchor chain steel is crucial in SPM systems, which allow for the mooring of large tankers, ensuring they remain securely anchored during loading and unloading operations.
Marine Vessels:ย Anchor chain steel is used in the construction of anchor chains for ships, providing the necessary strength and durability to anchor vessels securely.
A significant application of anchor chain casting steel is in the development of mooring systems for FPSOs in the North Sea. These systems must endure extremely harsh conditions, including high waves, strong currents, and corrosive seawater. By utilizing R4 grade anchor chain steel, the mooring systems have demonstrated superior performance, ensuring the safety and stability of the FPSOs over extended service periods.
Diameter: ฯ13mm-130mm
Length: 2000mm – 12000mm
| Steel for Offshore Mooring Chain Cables | ||||||||||||
| Level Code | Grade | Chemical Composition (Mass Fraction) /% | ||||||||||
| C | Si | Mn | P | S | Cr | Mo | Ni | Nb | Cu | Alt | ||
| R3 | 30Mn2 | 0.25~ 0.35 |
0.15~ 0.35 |
1.40~
1.90 |
โค0.025 | โค0.025 | โค0.60 | โค0.20 | โค0.30 | โค0.05 | โค0.20 | 0.020~ 0.050 |
| R3S | 25MnCrMo | 0.20~ 0.30 |
0.15~ 0.30 |
1.20~ 1.75 |
โค0.025 | โค0.025 | โค0.80 | โค0.50 | โค0.70 | โค0.06 | โค0.20 | 0.020~ 0.050 |
| R4 | 23MnCrNiMo | 0.18~ 0.28 |
0.15~ 0.30 |
1.20~ 1.75 |
โค0.025 | โค0.025 | 0.40~ 1.30 |
0.20~ 0.60 |
0.40~ 1.40 |
โค0.06 | โค0.20 | 0.020~ 0.050 |
| R4S | 21MnCrNiMo | 0.16~ 0.26 |
0.15~ 0.30 |
1.20~ 1.75 |
โค0.025 | โค0.025 | 0.40~ 1.30 |
0.20~ 0.60 |
0.40~ 1.40 |
โค0.06 | โค0.20 | 0.020~ 0.050 |
| R5 | 21Cr2NiMo | 0.16~ 0.26 |
0.15~ 0.30 |
0.70~ 1.75 |
โค0.025 | โค0.025 | 1.20~ 2.00 |
0.20~ 0.60 |
0.50~ 1.40 |
โค0.06 | โค0.20 | 0.020~ 0.050 |
| Steel Bars for Ship Anchor Chain | |||||||||
| Grade | Chemical Composition (Mass Fraction) /% | ||||||||
| C | Si | Mn | P | S | Als | V | Nb | Ti | |
| CM490 | 0.17๏ฝ0.24 | 0.15๏ฝ0.55 | 1.10๏ฝ1.60 | โค0.035 | โค0.030 | โฅ0.015 | |||
| CM690c | 0.27๏ฝ0.33 | 0.15๏ฝ0.55 | 1.30๏ฝ1.90 | โค0.035 | โค0.030 | โค0.10 | โค0.05 | โค0.02 | |
| a The total aluminum (Alt) content can be measured instead of acid-soluble aluminum (Als), and in this case, the total aluminum content should not be less than 0.020%.
bTrace elements such as V, Nb, Ti, etc., are allowed to be added to the steel. cTrace elements can be added individually or in any combination, and their content needs to be included in the quality certificate. When added individually, their content should comply with the provisions of this table. When two or more elements are added in combination, their total content should not exceed 0.12%. |
|||||||||
| Anchor Chain Casting Steel | |||||
| NO. | GB | ISO | ASTM/AISI | DIN | JIS |
| 1 | 30Mn2 | 1330 | 30Mn5 (1.1170) | SMn438 | |
| 2 | 25MnCrMo | 4130 | 25CrMo4 (1.7218) | SCM430 | |
| 3 | 23MnCrNiMo | 4320/8620 | 20NiCrMo2-2 (1.6523) | SNCM220 | |
| 4 | 21MnCrNiMo | 8620 | 20NiCrMo2-2 (1.6524) | SNCM220 | |
| 5 | 21Cr2NiMo | 3316 | 20Cr2Ni4 (1.6722) | SNCM420 | |
