Objective
Verify the new welding technologies with submerged arc welding applied on 9% nickel steel, employed for the containers of storage, transportation and processing of hydrocarbons, in the thickness range 18-48mm.
On the basis of the various tests performed, our evaluation of the results obtained is the following:
- to weld steel plates type 9% nickel with submerged arc process, the best mechanical characteristics can be obtained using materials belonging to group A (type 60 NI - 20 Cr 9 Mo - 3. 5 Nb). With this type of weld metal we obtain (in 80% of cases) the minimum characteristics required for the base metal
- the best combination, from the point of view of both operational and mechanical characteristics, is the wire-flux combination E9-F2 of group B
- another satisfactory combination is E11-f4 of group C
- considering the economical aspect of this matter, we would like to underline hereunder the price difference in the three types of deposits, namely:
Group A: LIT 40 000/50 000 (for each kg of weld deposit)
Group B: LIT 60 000/80 000 (for each kg of weld deposit)
Group C: LIT 20 000/25 000 (for each kg of weld deposit).
On the basis of chemical and mechanical properties, wires and fluxes have been subdivided into three weld metal groups:
a) for weld metal type 70 NI - 20 CR - 2. 5 Nb
b) for weld metal type 60 NI - 20 CR - 9 Mo - 3. 5 Nb
c) for weld metal "modified stainless steel" type (for instance: 18 Cr - 13 Ni - 7 Mn 3W)
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Coordinator
25100 Brescia
Italy
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