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Mooring Marine Bollards
DOLPHIN MARINE Mooring Marine bollards incorporate the high quality materials, rigorous testing and inspection needed for safe, reliable mooring. Cast steel is the most popular material and comes with the option of Charpy testing for low temperature use at or below -20°C. Our bollards are also available in nodular (spheroidal graphite) iron where this is still preferred.



Cast Steel vs Cast Iron
Before cast steel was readily available, Marine bollard were made in different grades of cast iron. Most modern ports now recognise the great benefits of cast steel but it is important to understand the differences between the materials to appreciate the benefits and advantages of cast steel compared to any grade of cast iron.

The main characteristics and benefits of cast steel, ductile (SG) iron and grey iron, are defined below to help designers and specifiers of bollards make informed choices.

Common Marine Bollard Materials
Typical material properties of cast steel and cast iron are given in the table. These assume high grade raw materials, proper manufacturing processes, heat treatment where applicable and effective quality management.DOLPHIN MARINE are leaders in high performance castings for safety critical applications. Our skilled staff employ the best raw materials and strictest process controls.

 


 Typical Properties* 

Grade

Yield

 

 

(MPa)

 

 

(ksi)

 

 

Elongation
(%)

Charpy†

 

 

(MPa)

 

 

(ksi)

Cast Steel EN-10293

 

GE300

300

44

600

87

15

 

27J at +20°C

 

G20Mn5

300

44

500

73

20

 

27J at -20°C

Cast Steel ASTM A27

 

65-35

240

35

450

65

24

Not tested 

 

70-36

250

36

485

70

22

Not tested 

 

70-40

275

40

485

70

22

Not tested 

Cast Steel A148 

 

80-50

345

50

550

80

22

Not tested 

Ductile (SG) Iron EN-1563 

 

EN-GJS-400-15

250

36

400

58

15

 

Not applicable

Grey Iron EN-GJL-300 

 

EN-GJL-300

Undefined 

300

44

1

Not applicable

* Properties given are typical values for each material grade based on prepared samples.
* Charpy testing is optional, and strongly recommended for low temperature applications.

Horn Bollards
Double Bitt Bollards
Bitt Bollards
Tricorn Bollards
Kidney Bollards
T-Head Bollards
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