產(chǎn)品詳情
奧地利伯樂(lè)BOHLER FOX CN 20/25 M-A、E385-17焊條
BÖHLER FOX CN 20/25 M-A Stick electrode
Classifications high-alloyed
EN ISO 3581-A: AWS A5.4:
E 20 25 5 Cu N L R 3 2 E385-17 (mod.)
Characteristics and field of use
Core wire alloyed, rutile coated stick electrode of type 904 L with above-average Mo content and
very high pitting resistance equivalent (PREN ≥ 45) of the weld bl (according to %Cr+3.3x%-
Mo+30x%N). Particularly used in the production of sulphuric and phosphoric acids in the cellulose
industry, in flue gas desulphurisation plants and also in the fertiliser industry, petrochemical industry,
fatty acid processing, the manufacture of acetic and bic acid, seawater desalination, in pickling
plants and for heat exchangers that are operated with sea or brackish water. The weld bl is fully
austenitic, and has distinct resistance to pitting and crevice corrosion in media containing chlorides,
high resistance to sulphuric, phosphoric, acetic and bic acid, as well as to sea water and brackish
water. As a result of the low C content of the weld bl, the risk of intergranular corrosion is also
avoided, whereas the high Ni content, in comparison with conventional 18/8 CrNi weld bl types,
provides very good resistance to stress corrosion cracking. As a result of the high over-alloying with
Mo as compared to 1.4539 or UNS N08904 it is possible to compensate for the demonstrably high
segregation rate of CrNi weld bls with a high Mo content. BÖHLER FOX CN 20/25 M-A has
outstanding welding properties, and is easily handled in every b except for vertical down. The
electrode exhibits good slag detachability, along with clean, finely rippled weld seams.
Base materials
same-type high-Mo content Cr-Ni steels 1.4539 X1NiCrMoCu25-20-5, 1.4439 X2CrNiMoN17-13-5,
1.4537 X1CrNiMoCuN25-25-5 UNS N08904, S31726
Typical analysis of all-weld bl (Wt-%)
C Si Mn Cr Ni Mo Cu N PREN
<=0.03 0.7 1.7 20.3 25.0 6.2 1.5 0.17 >=45
Mechanical properties of all-weld bl
Heat
Treatment
Yield
strength
0.2%
Tensile
strength
Elongation
(L0=5d0)
Impact values
in J CVN
MPa MPa % +20°C: -196°C:
untreated 410 640 34 70 ≥ 32
Operating data
Polarity = + / ~
Dimensions (mm) Amperage A
2.5 x 300 50-80
3.2 x 350 80-110
4.0 x 350 100-135
Approvals and certificates
TüV (6634.), SEPROZ, CE
Similar alloy filler bls
Stick electrode: FOX CN 20/25 M TIG rod: CN 20/25 M-IG
Solid wire electrode: CN 20/25 M-IG (Si)
