E7018-1 H4R vs ER70S-6: 48% composition overlap. Significantly different materials serving different application areas.
E7018-1 H4R vs ER70S-6
Side-by-side chemical composition and mechanical property comparison.
Overview
E7018-1 H4R
Low-hydrogen basic coated SMAW electrode with enhanced toughness (-45°C) and moisture-resistant coating (H4R designation = max 4ml H₂/100g, moisture-resistant). The premium structural steel electrode for critical applications: bridges, high-rise buildings, offshore structures, pressure vessels (ASME Section IX) and seismic-resistant frames. 70 ksi (485 MPa) tensile strength. AC or DCEP. The "-1" suffix indicates 27J impact at -45°C. H4R coating resists moisture pickup for 9+ hours after removal from hermetically sealed packaging.
ER70S-6
K11140
The world's most popular solid MIG/TIG welding wire for carbon steel. High manganese (1.40-1.85%) and silicon (0.80-1.15%) content provides superior deoxidizing power — welds cleanly even on slightly rusty or oily steel. Copper-coated for smooth wire feeding. Produces X-ray quality porosity-free welds with excellent bead appearance. Used with CO2 or Ar/CO2 shielding gas. Minimum 480 MPa tensile strength. Used for general fabrication, structural steel, shipbuilding, pressure vessels, automotive, and construction. The go-to wire for every MIG welder.
| E7018-1 H4R | ER70S-6 | |
|---|---|---|
| Material Number | — | K11140 |
| Category | Welding | Welding |
| Standard | AWS A5.1 | AWS A5.18 |
Chemical composition (wt%)
| Element | E7018-1 H4R | ER70S-6 | Overlap |
|---|---|---|---|
| C | ≤ 0.08% | 0.06–0.15% | Partial |
| Si | 0.3–0.6% | 0.8–1.15% | No overlap |
| Mn | 1–1.6% | 1.4–1.85% | Partial |
| P | ≤ 0.025% | ≤ 0.025% | OK |
Mechanical properties
| Property | E7018-1 H4R | ER70S-6 | Unit |
|---|---|---|---|
| Tensile Strength | ≥ 485 | — | MPa |
| Yield Strength | ≥ 400 | — | MPa |
| Elongation | ≥ 22 | — | % |
Compatibility Assessment
E7018-1 H4R and ER70S-6 have significantly different compositions (48% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is E7018-1 H4R the same as ER70S-6?
E7018-1 H4R and ER70S-6 have a 48% composition overlap. They are generally not directly interchangeable.
Can I replace E7018-1 H4R with ER70S-6?
Generally not recommended. The compositions differ significantly (48% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between E7018-1 H4R and ER70S-6?
The main differences are in the following elements: C, Si, Mn. E7018-1 H4R is a Welding grade, while ER70S-6 is a Welding grade.
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.