AKR307L

Standard: 

EN ISO 3580 B E5516-1CM

AWS A5.5 E8016-B2

GB/T 5118 E5515-B2L

Description: AKR307L is a kind of low carbon heat-resistant steel electrode with low-hydrogen natri-um type coating. It has excellent technological performance, low spatter, good slag detachability, beautiful appearance of weld. DCRP (Direct Current Reversed Polarity). All-position welding. short-arc welding. The weldments should be given preheating to 160~220 ℃ before welding The weldments should be given tempering at 680-720℃ after welding.

Application: Used for welding Cr1.0%-Mo0.5% heat-resistant steel below 520℃, such as boiler pipes, high pressure vessels, equipment for petroleum refining, etc. Also used for welding 30CrMoSi cast steel.

Typical Chemical Composition(%): 

C:0.05    Mn:0.90    P:0.030     S:0.030     Si:1.0     Cr:1.0-1.5    Mo:0.4-0.65   

Typical Mechanical Properties(%): 

Tensile strength (MPa) : ≥520

Yield Stress (MPa) : ≥390

Elongation (%) : ≥17

Impact values (J)  :  ≥27J/normal temperature   

Recommended welding parameters:

2.5mm: 300mm    60-90A

3.2mm: 350mm    90-120A

4.0mm: 400mm    140-180A

5.0mm: 400mm    170-210A

Notes on Usages:

1.The electrodes must be baked at350~380℃for an hour before welding and  used as soon as baking is completed.

2.The stains on the weldments, such as rust, oil stains, moisture, etc., must be cleared away  before welding

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