AS B-248 H4R

Askaynak

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General Description

AS B-248 H4R is a basic coated electrode. It is used particularly to weld rigidly restrained mass structures where high welding stresses are unavoidable. Weld metal has a high resistance to cracking. The slag is easy to remove and it gives excellent quality, smooth weld beads. It is also suitable for welding in vertical upwards position at a high welding speed. It has 125% metal recovery.

 

Classification and Chemical Composition

TS EN ISO 2560-A : E 42 4 B 42 H5
AWS A5.1 : E 7018 H4R
EN ISO 2560-A : E 42 4 B 42 H5
C Si Mn  

0,07

0,50

0,90

 

 

Mechanical Properties, Typical, All Weld Metal

Yield Strength : 470 (N/mm²)    
Tensile Strength : 550 (N/mm²)    
Elongation (L=5d) : 30 (%)    
Impact
: 127 (Joule) (–40°C)  

Note: Redrying Temperature: 350-400°C / 3 hours.

 

Approvals

ABS

BV

DNV

GL

LRS

 

Applications and Materials to be Welded

AS B-248 H4R is suitable for steel constructions and machines operating under dynamic forces. Ship building, boiler and pressure vessel manufacturing and pipe connections are among its application areas. It is recommended for the welding of high carbon, high strength low alloyed steels having high (P) and (S) content; high strength ship’s plate of A-, D- and E- quality and vessel plates of 17 Mn 4 and 19 Mn 5 type. AS B-248 H4R can join steel parts to steel casts and can be used in welding of thick parts. It is suitable for the root pass and welding in difficult positions. It gives excellent weld beads with high impact strength values at subzero temperatures. It is also very suitable for welding of GALVANIZED plates.

General Structural Steels :
DIN: St 33, St 34, St 37, St 44, St 44-2, St 44-3, St 52
EN: S185, S235, S275, S355
DIN: St 37-4, St 44-4, St 52-4
EN: P235TR2 - P355T2
DIN: St 50-2, St 60-2
EN: E295, E335
DIN: C 55, Ck 55
EN: C55
Fine Grained Steels :
DIN: StE 255 - StE 420
EN: S255N - S420N
DIN: WStE 255 - WStE 420
EN: P255NH - P420NH
DIN: TStE 255 - TStE 420
EN: S255NL - S420NL / P275NL1 - P355NL1
Elevated Temperature Steels :
DIN: St 35-8, St 45-8
EN: P235G1TH - P255G1TH
Boiler and Pressure Vessel Steels :
DIN: HI, HII, HIII
EN: P235GH, P265GH, P285NH
DIN: 17 Mn 4, 19 Mn 6
EN: P295GH, P355GH
Ship Plates :
DIN: A, D, E
DIN: AH32 - EH36
Cast Steels :
DIN: GS-38, GS-45, GS-52, GS-60
EN: GE200, GE240, GE260, GE300
DIN: GS-62
Pipe Materials :
DIN: StE 210-7 - StE 360-7
EN: L210 - L360NB
DIN: StE 290-7 TM - StE 360-7 TM
EN: L290MB - L360MB
DIN: X42, X46, X52, X60 (API 5LX)
 

Welding Parameters / Packing and Diameter Informations

Current Type and Polarity : DC (+)

Diameter
(mm)
Length
(mm)
Current
(A)
Electrode Weighth
(gr/100 pcs)

Electrode perBox

Box Weight 
(kg)
2.50 350   80 - 110   2439   82 2,0
3.25 350 110 - 145   3846   52 2,0
4.00 450 130 - 190   8519   27 2,3
5.00 450 190 - 245 13333   18 2,4
 

Welding Positions

 

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