Bostrand 309LSi          

AWS A/SFA 5.9-93        : ER309LSi
EN 12072                      : G 23 12 LSi

Description and applications

Bostrand 309LSi is a corrosion-resisting 24% chromium -13% nickel stainless steel solid wire for welding austenitic chromium-nickel alloys of the 23Cr/12Ni type, and for joining dissimilar steels e.g. stainless steel to mild steel. The silicon content of the wire is elevated in order to improve weldability.

Bostrand 309LSi is also suitable for use as a buttering layer when cladding ferritic steels with stainless steels. It may also be used for joining high carbon equivalent ferritic steels to themselves with reduced preheat requirements.

The gas shield should be an Ar/He mixture, or Ar/1%O2 or Ar/2%O2. CO2 may also be used if a weld metal carbon level above 0.03% is acceptable.

All-weld mechanical properties - as welded using Argon +2%02
Yield stress                                                440 min   MPa
Tensile strength                                          600 min   MPa
Elongation                                                  41 min     %
Charpy V impact values    +20%                   160         J
                                       -60°C                   130         J
                                       -110°C                 90           J
Chemical composition (wire)
C      0.025 max
Si     0.65-1.00
Mn    1.0-2.0
S      0.025 max
P      0.030 max
Cr     23.0-25.0
Ni     12.0-14.0
Mo    0.50 max
Welding parameters
Size Current mm amps 0.8
50-140		 1.0
80-190		 1.2
180-280

Murex Welding Products
Hanover House, Queensgate, Britannia Road,
Waltham Cross, Herts, EN8 7TF
Telephone: (01992) 710000 Fax (01992) 719191