PRODUCT RANGE SHIPBUILDING: OSNA®-10 AND OSNA®-30

KME’s Division Marine Applications specializes in the production of copper base alloys for piping systems in shipbuilding, offshore installations and other marine applications.

The sea and its atmosphere is one of the most corrosive environments on the earth. Seagoing vessels need large amounts of seawater daily for

  • fire water systems
  • sprinkler systems
  • cooling systems
  • ballast systems

The materials used for seawater piping systems therefore must be highly resistant to cavitation erosion, crevice and galvanic corrosion as well as stress corrosion cracking. Moreover such materials must satisfy high standards in terms of hot and cold working properties and weldability.

QUALITY

A KME Quality Management System has been set up, implemented and certified to DIN EN ISO 9001 by LLOYD'S REGISTER QUALITY ASSURANCE. The KME Quality Management System comprehends process-integrated quality controls, internal product and system audits, the systematic training of all employees and the operation of computeraided statistical methods. Our results have been surpassing the requirements of national and international standards for years.

PROPERTIES AND ADVANTAGES OF COPPERNICKEL ALLOY

For decades, seawater pipe systems made of copper-nickel alloys have been put to successful use on seagoing vessels and offshore production units like platforms, drilling rigs, semisubmersibles FPSOs etc.

The chemical composition of OSNA®-10 (CuNi 90/10) and OSNA®-30 (CuNi 70/30) coppernickel alloys have been modified so that they meet the requirements of all the main international standards (see tables below). Reduced tolerance limits for certain impurities moreover provide for an enhanced cold workability and weldability of KME’s alloy.

OSNA®-10 and OSNA®-30 seawater pipes are manufactured in two configurations: seamless and seamwelded.

Despite the rough conditions in marine service and the highly corrosive nature of seawater, the products provide well balanced combination of technical and economical advantages:

  • Simple alloying system with good weldability
  • Excellent ductility and toughness
  • Outstanding erosion corrosion performance
  • Resistant to uniform and localised corrosion
  • No effect of ambient seawater temperatures
  • No effect of seawater chlorination
  • Resistant to biofouling
  • Resistant to stress-corrosion cracking
  • Low maintenance costs
  • A lot of design experience
OSNA®-10 (CuNi 90/10)OSNA®-30 (CuNi 70/30)
  • 6-457 mm O.D. seamless
  • up to 1200 mm O.D. seam-welded
  • 6-323.9 mm O.D. seamless
  • up to 1200 mm O.D. seam-welded
International Standards
  • DIN CEN/TS 13388 (CW352H)
  • DIN 86019 2.1972
  • BS 2871 CN 102
  • EEMUA 144 UNS 7060x
  • ASTM-B-466 C 70600
  • MIL-T-16420 K C 70600
  • JIS H 3300 C 7060T
International Standards
  • DIN CEN/TS 13388 (CW354H)
  • DIN EN 12449
  • ASTM-B-466 C 71500
  • MIL-T-16420 K C 71500
  • JIS H 3300 C 7150T

Besides pipes, KME offers a comprehensive range of fittings in different sizes and dimensions, enabling seawater pipe systems to be constructed for different applications.

COMPARISON OF STANDARD SPECIFICATIONS FOR OSNA®-30* (CuNi 70/30)

  KME Alloy
OSNA®-10
(CuNi 90/10)
DIN CEN/TS
13388
CW352H
DIN 86019
WL 2.1972

BS 2871(1)
CN 102

DIN EN 12449


EEMUA
144-1987
UNS C 7060 x
MIL-T- 16420K
ASTM B 466(2)
C 70620
JIS H 3300
C 7060 T

Ni % 10.0 - 11.0 9.0 - 11.0 9.0 - 11.0 10.0 - 11.0 9.0 - 11.0 10.0 - 11.0 9.0 - 11.0 9.0 - 11.0
Fe % 1.5 - 1.8 1.0 - 2.0 1.5 - 1.8 1.0 - 2.0 1.0 - 2.0 1.5 - 2.0* 1.0 - 1.8 1.0 - 1.8
Mn % 0.6 - 1.0 0.5 - 1.0 0.5 - 1.0 0.5 - 1.0 0.5 - 1.0 0.5 - 1.0 max. 1.0 0.2 - 1.0
C % max. 0.02 max. 0.05 max. 0.05 max. 0.05 max. 0.05 max. 0.05 max. 0.05  
Pb % max. 0.01 max. 0.02 max. 0.01 max. 0.01 max. 0.02 max. 0.01 max. 0.02 max. 0.05
S % max. 0.005 max. 0.05 max. 0.005 max. 0.05 max. 0.05 max. 0.02 max. 0.02  
P % max. 0.02 max. 0.02 max. 0.02   max. 0.02 max. 0.02 max. 0.02  
Zn % max. 0.05 max. 0.50 max. 0.05   max. 0.50 max. 0.20 max. 0.50 max. 0.50
Sn %   max. 0.03     max. 0.03      
other imp. max. 0.20 max. 0.20 max. 0.20 max. 0.30 max. 0.20 max. 0.30    
Cu % rem. rem. rem. rem. rem. rem. rem. +Ni+Fe+Mn
                min. 99.5

(1)  no longer valid

(2)  equal to C 70600 for subsequent welding

*    the iron content has been specified to improve corrosion resistance

COMPARISON OF STANDARD SPECIFICATIONS FOR OSNA®-30* (CuNi 70/30)

  KME Alloy
OSNA®-30
(CuNi 70/30)
DIN CEN/TS 13388
CW354H
BS 2871(1)
CN 107
DIN EN 12449 MIL-T-16420K
ASTM B 466(2)
C 71520
JIS H 3300
C 7150 T
Ni % 30.0 - 32.0 30.0 - 32.0 30.0 - 32.0 30.0 - 32.0 29.0 - 33.0 29.0 - 33.0
Fe % 0.6 - 1.0 0.4 - 1.0 0.4 - 1.0 0.4 - 1.0 0.4 - 1.0 0.4 - 1.0
Mn % 0.5 - 1.0 0.5 - 1.5 0.5 - 1.5 0.5 - 1.5 max. 1.0 0.2 - 1.0
C % max. 0.04 max. 0.05 max. 0.05 max. 0.05 max. 0.05  
Pb % max. 0.01 max. 0.02 max. 0.03 max. 0.02 max. 0.02 max. 0.05
S % max. 0.01 max. 0.05 max. 0.02 max. 0.05 max. 0.02  
P % max. 0.01 max. 0.02 max. 0.02 max. 0.02 max. 0.02  
Zn % max. 0.20 max. 0.50 max. 0,50 max. 0.50 max. 0.50 max. 0.50
Sn %   max. 0.05   max. 0.05    
other imp. max. 0.30 max. 0.20 max. 0.30 max. 0.20    
Cu % rem. rem. rem. rem. rem. +Ni+Fe+Mn
            min. 99.5

(1)  no longer valid

(2)  equal to C 71500 for subsequent welding