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UTP 641 KB

UTP 641 Kb is an electrode for welding and surfacing applications that can be used for high-quality welding of vessel and tube steels up to an operating temperature of 570°C. The weld metal has good hardenability and can be quenched and tempered. It can be welded in all positions except vertical-down and has a recovery rate of 115%. Typical mechanical properties after different heat treatments are provided. The electrode is approved by TÜV and its parameters and chemical composition are also specified.

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166 views1 page

UTP 641 KB

UTP 641 Kb is an electrode for welding and surfacing applications that can be used for high-quality welding of vessel and tube steels up to an operating temperature of 570°C. The weld metal has good hardenability and can be quenched and tempered. It can be welded in all positions except vertical-down and has a recovery rate of 115%. Typical mechanical properties after different heat treatments are provided. The electrode is approved by TÜV and its parameters and chemical composition are also specified.

Uploaded by

VIRPOP
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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UTP 641 Kb Standard: EN 1599: E CrMo1 B 4 2 H5

Basic-lime type stick electrode for joint AWS A 5.5: E 8018 – B2


welding and surfacing

Application field
UTP 641 Kb can used for high-quality welding-seams on vessel- and tube steels and similar steel qualities.
Operating temperature up to 570 °C. Furthermore for similar-alloyed tempering steels, non treated hardened
steels and nitride steels.

Welding properties
The weld metal can be quenched and tempered and consists of a good hardenability. For applications on
tempered steels the hardness depends on the dilution degree with the base metal. The electrode can be welded
in all positions except vertical-down. Dry storage. If necessary redry for approx. 2 h at 300 °C. Reco very 115%.

Base materials: 13 CrMo 4-5; GS-22 CrMo 54, 42 CrMo 4

Mechanical properties
Yield strength Tensile strength Elongation Impact strength Av
Re (N/mm²) Rm (N/mm²) A5 (%) (ISO-V) J

tempered ½ h 720°C / air > 490 610 - 705 > 22 > 96


Quenched and tempered
> 375 400 – 570 > 25 > 96
½ h 930°C / air + ½ h 720°C

Weld metal chemical analysis in % (approx. values)


C Si Mn Cr Mo
0,09 0,3 0,8 1,2 0,5

Heat treatment
Welding of boiler- and pipe usually at temperatures of 200 – 250°C. Annealing after welding for approx . ½ h at
680 – 700 ° C. Preheating of hardened, nitride and tool steels to 250 – 450°C.

Polarity : = + Welding positions :

Parameter settings : PA PB PF PC PE

Electrodes ∅ mm × L 2,5 × 350* 3,2 × 450 4,0 x 450


Amperage A 60 - 90 100 - 150 140 - 190
* = on demand

Approvals
TÜV

Bad Krozingen, 09/2007, Rev. 1, ta

All technical data based upon careful investigation and intensive research. However, we do not assume any liability for their
correctness. We recommend the user to test - on his own responsibility - our products with regard to their special
application.

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