🛢️

Offshore Platforms

Marine

Heavy-duty alloys for oil rig structures, subsea pipelines, and platform supports in offshore energy extraction. These materials face combined challenges of saltwater immersion, high pressures, sour gas exposure, and cathodic protection compatibility.

Marine environments present one of the harshest challenges for metallic materials. Constant exposure to saltwater, biological fouling, wave-induced fatigue, and galvanic coupling between dissimilar metals demand alloys specifically engineered for corrosion resistance and long-term durability. From offshore oil platforms to naval warships and luxury yachts, marine alloy selection is literally a matter of life and safety.

Material Requirements

Marine alloys must resist pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments. Critical assessments include pitting resistance equivalent number (PREN > 40 for seawater), galvanic compatibility charts, cathodic protection response, biofouling resistance, and weldability without sensitization. Classification societies (Lloyd's, DNV, ABS) certify materials for hull, machinery, and offshore structures.

Key Alloys

Duplex stainless steel 2205 and super duplex 2507 dominate offshore piping and subsea equipment. Copper-nickel alloys (90/10 and 70/30 CuNi) are standard for seawater piping and heat exchangers due to natural antifouling properties. Aluminum 5083-H321 is the go-to for fast ferry and patrol boat hulls. Naval brass (C46400) and Monel 400 serve in propeller shafts, valves, and pumps exposed to seawater.

Future Trends

Additive-manufactured propellers in nickel-aluminum bronze (NAB) are reducing lead times from months to weeks. High-nitrogen austenitic steels are emerging as cost-effective alternatives to duplex grades for moderate chloride exposure. Bio-inspired antifouling coatings combined with copper-infused alloy surfaces are reducing maintenance intervals for ship hulls and marine infrastructure.

Geeignete Legierungen

Legierung Grundmetall Eignung
304 Stainless Steel Properties: SS304 Composition, Density, Yield Strength, Thermal Conductivity, Hardness, Modulus of Elasticity Stainless Steel
AISI 316L Stainless Steel Properties: Composition, Tensile Yield Strength Stainless Steel
AISI 316 Stainless Steel Properties, SS 316 Grade Density, Composition, Yield Strength, Thermal Conductivity Stainless Steel
AISI 316 vs 316L Stainless Steel, Difference of SS316 & SS316L Properties Composition Yield Strength Density Stainless Steel
SAE AISI 4140 Steel Properties, Material Heat Treatment, Rockwell Hardness Steel
SAE AISI 4340 Steel Properties, Heat Treatment, Equivalent, Hardness Chart, Density, Machinability Steel
42CrMo, 4140 und 42CrMo4 (EN 1.7225) im Vergleich Steel
SUS304 Stainless Steel Material Properties, Chemical Composition, Meaning Stainless Steel
AISI 304 Stainless Steel Properties: Tensile Yield Strength & Hardness Stainless Steel
Difference Between 304 vs 316 Stainless Steel SS304 vs SS316 Stainless Steel
AISI 304 vs 304L Stainless Steel Properties (UNS S30403) Difference Between 304 and 304L (SS304L) Stainless Steel
30CrMo — Äquivalente, chemische Zusammensetzung, mechanische Eigenschaften Steel
321 Stainless Steel Machinability Stainless Steel
35CrMo Vergütungsstahl — Zusammensetzung, mechanische Eigenschaften, Äquivalente Steel
40CrNiMo / 40CrNiMoA — Äquivalente, Zusammensetzung, Eigenschaften Steel
40Cr Steel Equivalent, Mechanical Properties & Chemical Composition Steel
42CrMoS4 +QT (Werkstoff 1.7227) — 42CrMoS4V, Eigenschaften, Zusammensetzung, Härte Steel
42CrMo — Äquivalente, chemische Zusammensetzung, mechanische Eigenschaften Steel
4Cr13 (40Cr13) Stainless Steel Datasheet, Properties Stainless Steel
7Cr17MoV High Carbon Stainless Steel Properties, Hardness, Heat Treatment, Equivalent Stainless Steel
7Cr17 Steel (68Cr17) High Carbon Stainless Steel Stainless Steel
(90Cr18MoV) 9Cr18MoV Stainless Steel Equivalent, Chemical Composition, Mechanical Properties Stainless Steel
95Cr18, 9Cr18 Stainless Steel Equivalent, Composition, Properties Stainless Steel
9Cr18Mo Stainless Steel Equivalent, Chemical Composition, Mechanical Properties Stainless Steel
A2 Tool Steel Properties A2 Material Heat Treat, Hardness, Tensile Yield Strength Steel
AISI 12L14 Steel Properties – SAE 12L14 Carbon Steel Equivalent Material Steel
AISI 301 Stainless Steel Properties, Type 301 Full Hard SS Grade Spring (UNS S30100) Stainless Steel
AISI 303 Stainless Steel Properties, SS 303 Density, Hardness, Magnetic, Equivalent (UNS S30300) Stainless Steel
AISI 310 Stainless Steel Properties, Grade 310 SS Composition Stainless Steel
AISI 410 Stainless Steel Properties, SS410 Heat Treatment, Magnetic, ASTM A276 (UNS S41000) Stainless Steel
AISI O1 Tool Steel Heat Treating & Properties Steel
AISI S7 Tool Steel Properties, S7 Material Heat Treating Hardness Steel
AISI SAE 8620 Steel Properties, Chemical Composition, Equivalent, Heat Treatment Steel
AISI SS 440 Stainless Steel 440C 440A 440B Material Properties Composition Hardness Stainless Steel
AISI Type 302 Stainless Steel Properties, SS302 Composition, Magnetic, Density, Hardness, Equivalent Stainless Steel
ASTM A307 Bolts Grade A, B, Gr 307A Threaded Rod Tensile Yield Strength Steel
ASTM A325 Bolts Dimensions Chart, Strength, Grade A325 Structural Bolt Sizes Steel
ASTM A36 Steel Properties, Modulus of Elasticity, Yield Strength, Material Density, Hardness & Equivalent Steel
ASTM A572 Grade 50 Steel Equivalent, Gr 65, 60 Properties, Tensile Yield Strength Steel
ASTM SAE AISI 1018 Carbon Steel Chemical Composition, Mechanical Properties Steel
ASTM SAE AISI 1045 Carbon Steel Heat Treatment, Chemical Composition, Properties Steel
ASTM SAE AISI 52100 Steel Properties, Composition, Equivalent Steel
China 45 Steel Equivalent, Mechanical Properties & Chemical Composition Steel
China 8Cr13MoV Stainless Steel, Blade Steel Review, Hardness, Datasheet, Specification Stainless Steel
D2 Tool Steel Hardness, D2 Metal Heat Treatment & Properties Steel
DIN 1.2343 (X37CrMoV5-1) Warmarbeitsstahl — Äquivalente und Eigenschaften Steel
DIN 1.3505 (100Cr6) Wälzlagerstahl — Äquivalente, Zusammensetzung, Härte Steel
DIN 1.4021 (X20Cr13) nichtrostender Stahl — Eigenschaften, Äquivalente, Zusammensetzung Stainless Steel
DIN EN 1.2379 (X153CrMoV12) Kaltarbeitsstahl — Datenblatt und Eigenschaften Steel
DIN EN 1.2842 (90MnCrV8) Kaltarbeitsstahl — Äquivalente, Datenblatt, Zusammensetzung Steel
DIN EN 1.4034 (X46Cr13) nichtrostender Stahl — Datenblatt und Eigenschaften Stainless Steel
DIN EN 1.4057 (X17CrNi16-2) nichtrostender Stahl — QT800, QT900 Stainless Steel
DIN EN 1.4301 (X5CrNi18-10) nichtrostender Stahl — Eigenschaften und Zusammensetzung Stainless Steel
DIN EN 1.4305 (X8CrNiS18-9) Automatenstahl — Eigenschaften und Datenblatt Stainless Steel
DIN EN 1.4401 (X5CrNiMo17-12-2) nichtrostender Stahl Stainless Steel
DIN EN 1.4404 (X2CrNiMo17-12-2) nichtrostender Stahl — Datenblatt, Schweißen, Äquivalente Stainless Steel
DIN EN 1.4462 (X2CrNiMoN22-5-3) Duplexstahl — Datenblatt und Eigenschaften Stainless Steel
DIN EN 1.4541 (X6CrNiTi18-10) nichtrostender Stahl — Datenblatt und Eigenschaften Stainless Steel
DIN EN 1.4571 (X6CrNiMoTi17-12-2) nichtrostender Stahl Stainless Steel
EN10025 S275 Steel S275JR Properties, Equivalent, Meaning, S275J2 Mild Steel S275J0 Steel
EN 1.0117 Baustahl S235J2 — Datenblatt, Äquivalente, Eigenschaften Steel
EN 1.0122 — S235JRC+C, S235JR+AR, S235JR+N: Bedeutung der Kurzzeichen Steel
EN 10130 DC01 (Werkstoff 1.0330+ZE) — Datenblatt, Äquivalente, Eigenschaften Steel
EN 1.0503 Vergütungsstahl C45 — Äquivalente, Eigenschaften, Zusammensetzung Steel
EN 1.4125 (X105CrMo17) — Zusammensetzung, Eigenschaften, Äquivalente Steel
EN 1.7131 Einsatzstahl 16MnCr5 — Werkstoff, Zusammensetzung, Eigenschaften Steel
En24 Steel Properties BS970 817M40 En24T Material Equivalent, Tempering, Strength & Hardness Steel
EN8 Steel Properties BS970 080M40 Equivalent Material Tensile Yield Strength Steel
GCr15 Steel Equivalent, Chemical Composition, Mechanical Properties Steel
GCr15 vs 52100, 100Cr6 and SUJ2 Bearing Steel Grades Steel
Grade 20Cr Steel Composition, Properties, Material Equivalent Steel
Grade 65Mn Steel High Carbon Spring Steel Properties, Specification, Equivalent Steel
H13 Tool Steel Properties, Material Hardness Range & Equivalent Steel
JIS G3101 SS400 Steel Equivalent Material Properties Specification Composition Density Strength Steel
Werkstoff 1.4310 (X10CrNi18-8) Federstahl — Datenblatt und Eigenschaften Stainless Steel
Werkstoff S355 — Eigenschaften, äquivalente Güten, EN 10025-2 Steel
Q195 Steel Chemical Composition, Mechanical Properties, Specification and Equivalent Steel
Q195 vs Q215, Q235 and Q275 Steel Steel
Q215 Steel, Q215A, Q215B Chemical Composition, Properties & Equivalent Steel
Q235 Steel Q235A Q235B Q235C Q235D Equivalent, Properties, Specification, Composition Steel
Q235 im Vergleich zu A36, SS400, E250 und S235JR (Q235A/B/C/D) Steel
Q275 Steel Chemical Composition, Properties & Equivalent Steel
Q345 Steel: Q345A Q345B Q345C Q345D Q345E Equivalent & Properties Steel
Q355 Steel: Q355B Q355C Q355D Properties & Equivalent Steel
Q390 Steel Properties, Chemical Composition & Equivalent Steel
Q420 Steel Chemical Composition, Properties, Specifications & Equivalent Steel
Q460 Steel Chemical Composition, Specifications, Properties & Equivalent Steel
Q690 Steel, Q690C Q690D Q690E Chemical Composition, Mechanical Properties Steel
S235J0 (Werkstoff EN 1.0114) — Datenblatt, Eigenschaften, Bedeutung Steel
S235JR (Werkstoff 1.0038) — Äquivalente, Eigenschaften, Zusammensetzung Steel
S235 Baustahl — Eigenschaften und äquivalente Werkstoffe Steel
S355J2 (Werkstoff 1.0577) — Eigenschaften und Äquivalente Steel
S355JR (Werkstoff 1.0045) — Eigenschaften und Äquivalente Steel
S355MC (Werkstoff 1.0976) — Eigenschaften und Äquivalente Steel
SAE AISI 1020 Steel Properties, C1020 Carbon Steel Yield Strength, Equivalent Steel
SAE AISI 1080 Steel Properties Heat Treatment Composition Rockwell Hardness Steel
SAE AISI 1095 Steel, High Carbon Steel Heat Treat, Properties & Hardness Steel
SAE AISI 4130 Chromoly Steel, Alloy Material Properties, Chemical Composition Steel
SAE AISI 5160 Steel, High Carbon 5160 Spring Steel Properties, Composition Steel
SAF Duplex 2205 Stainless Steel (UNS S32205 S31803) Alloy Material Data Sheet, Properties, Composition, Density Stainless Steel
(SK85) SK5 Carbon Steel Properties, Composition & Equivalent Steel
SKD10 Material SKD11 Steel Properties & Equivalent Steel
SS321 AISI 321 Stainless Steel Properties, TP321 321H Composition Stainless Steel
SS420 Grade AISI 420 Stainless Steel Properties, Heat Treatment, Hardness, Magnetic Stainless Steel
SS430 AISI Grade 430 Stainless Steel Properties Composition Magnetic Equivalent Stainless Steel
SS904L AISI 904L Stainless Steel (UNS N08904) Material Properties, Composition, Hardness Stainless Steel
Stainless Steel Chemical Composition Chart Stainless Steel
SUJ2 Steel Equivalent, Composition, Properties, Hardness Steel
Surface Finish: 1U 1C 1E 1D 1X 1G 2A 2H 2C 2D 2E 2B 2G 2P 2R 2Q Steel
T10 Tool Steel Chemical Composition, Mechanical Properties & Equivalent Steel
T7 Tool Steel, T7A Chemical Composition, Properties & Equivalent Steel
Werkstoff 1.0037 — St37-2 nach DIN 17100, Äquivalente und Eigenschaften Steel
W1 Tool Steel Properties, Composition, Heat Treatment Steel
Werkstoff 1.0570 — St52-3 nach DIN 17100, Äquivalente und Eigenschaften Steel
1.4104 (X14CrMoS17) nichtrostender Automatenstahl — Eigenschaften, Äquivalente, QT650 Stainless Steel
Werkstoff 1.7147 — Einsatzstahl 20MnCr5, Eigenschaften und Zusammensetzung Steel
Werkstoff 1.7225 — 42CrMo4 +QT, Zusammensetzung, Äquivalente, Eigenschaften Steel
18/8 Stainless Steel Properties, Yield Strength, Composition, Density, Tensile Strength, Hardness Stainless Steel
(20Cr13) 2Cr13 Stainless Steel Equivalent, Properties & Chemical Composition Stainless Steel
20CrMo — Äquivalente, chemische Zusammensetzung, mechanische Eigenschaften Steel
25CrMo — chemische Zusammensetzung, mechanische Eigenschaften, Äquivalente Steel
2Cr13 vs 3Cr13 Steel, What is the Difference? Compared Steel
(30Cr13) 3Cr13 Stainless Steel Equivalent, Chemical Composition, Properties Stainless Steel

Häufig gestellte Fragen

What alloys are used in offshore platforms?
AlloyFYI lists 123 alloys suitable for offshore platforms, rated by suitability. Heavy-duty alloys for oil rig structures, subsea pipelines, and platform supports in offshore energy extraction. These materials face combined challenges of saltwater immersion, high pressures, sour g
What industry does offshore platforms belong to?
Offshore Platforms falls under the Marine industry sector.
How are alloys rated for offshore platforms?
Each alloy receives a suitability rating from 1 to 5 stars based on its mechanical properties, corrosion resistance, and real-world performance in offshore platforms applications.