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Low Hydrogen

JACKSUN 18 SPECIAL H4R

AWS A5.1: E7018 H4R
  • Premium low-hydrogen, iron-powder type electrode designed for critical structural welds.
  • H4R rating indicates extra-low diffusible hydrogen (≤ 4 ml/100 g weld metal) and suitability for high-strength steel and restrained joints.
  • Provides excellent crack resistance and impact toughness even at low temperatures (-30 °C and below).
  • Ideal for bridges, offshore structures, pipelines, tanks, shipbuilding, and heavy fabrication.
  • Operates on AC and DC+ polarity.
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Technical Data

Product Specifications

1. Typical Chemical Composition

CMnSiSNiCrPMoV
≤ 0.15≤1.60≤ 0.90≤ 0.0300.300.20≤ 0.0350.300.08

2. Typical Mechanical Properties

PropertyUTS (MPa)Yield Strength (MPa)Elongation (%)Impact Toughness (J @ -30 °C)Diffusible Hydrogen (ml/100 g)
Requirement≥ 490≥ 400≥ 22≥ 47≤ 4
Typical Values520 – 570430 – 48024 – 3260 – 802 – 4

3. Dimension, Current Condition & Packing Data (SMAW Welding)

Size (mm)Size (inch)Current Range (A)PolarityVoltage (V)Packing (5 kg)Packing (20 kg)
2.53/3270 – 100AC / DC+20 – 22✔✔
3.21/890 – 140AC / DC+22 – 24✔✔
4.05/32130 – 190AC / DC+24 – 26✔✔
5.03/16180 – 250AC / DC+26 – 28✔✔
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