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CHH408 (Heat-Resisting Steel Wilding Electrode)

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CHH408                                          

Heat-Resisting Steel Wilding Electrode                            

CHH408 is a potassium low hydrogen iron powder type,low alloy welding rods. With a trait of resistance kf high temperature and oxidation,it is suitable for fabricating equipments of chemical and petroleum industries as well as high temperature, high press pipes which is fabricated by Cr2.5Mo low alloy steel, which work temperature lower than 550℃. All position welding is obtained and short arc is recommended. It is should be backed at a temperature between 350℃ - 380℃ for 1 hour before welding. The base metal should be heated to 300℃ before welding and it is must be tempered at 720℃ - 750℃ after welding.

Chemical Composition of Deposited Metal (%)

C Mn Si S P Cr Mo
Standard 0.05-0.12 ≤0.90 ≤0.80 ≤0.035 ≤0.035 2.00-2.50 0.90-1.20
Typical 0.072 0.65 0.15 0.012 0.010 2.27 1.12

Michanical Properties of Deposited Metal

  Yield Point
бs(MPa)
Tensile Strength
бb(MPa)
Elongation
δ5(%)
Impact Value(J)
20℃
Standard ≥490 ≥590 ≥15 ≥27
Typical 560 655 22 160

Sizes, Pieces & Recommended Current (AC≥70V or DC+)

Size(mm) 2.5×300 3.2×350 4.0×400 5.0×400
Pieces(5kg) ≈299 ≈160 ≈88 ≈57
Current(A) 60-90 90-120 140-180 170-210


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