gENERAL DESCRIPTION

Kobatek 381 deposits a Cr/Ni/Mo based stainless steel weld metal. It is designed for welding large, high strength steel components requiring fast multi-layer deposits with crack resistance. It is ideal for repairing difficult-to-weld steels and for putting down buffer layers before filling up with hardenable deposits. It can be used as a buffer layer on high manganese Hadfield steel and for surfacing where some resistance to impact and battering is required under corrosive conditions.

Mechanical Properties, Typical, All Weld Metal

Yield Strength : 58 – 62 (kg/mm²)    
Tensile Strength : 76 – 82 (kg/mm²)    
Elongation (L=5d) : 20 – 25 (%)    
Hardness : 220 – 260 (HB)    
 

Approvals and Certificates

Certificates

GOST

TSEK

 

Application Areas

  • Press cylinders in plastic and food industries
  • Earth moving equipments
  • Hydraulic cylinders
  • Injection moulds
  • Extrusion screws
  • Turbine blades
  • Valve seats for superheated steam
  • Heat exchangers
  • Coal washing screens
  • Wear plates
  • Bucket tooth
  • Dies, gears, shafts, tools

Welding Parameters / Packing and Diameter Informations

Current Type and Polarity : DC (+) / AC

Diameter x Length
(mm)
Procedure – A
Current (Amper)
Procedure – B
Current (Amper)
Weight
(kg/box)
2.50 x 350
  90 – 120 70 – 80 5
3.25 x 350
130 – 150 110 – 120 5
4.00 x 350
180 – 210 120 – 160 5

PROCEDURE – A 
High Amperage Welding
High amperage welding for heavy sections and large parts, maximum deposition rates.

PROCEDURE – B
Low Amperage Welding
Low amperage welding for small sections and parts which must not be overheated, minimum dilution and low heat input.