E7018-1 H4R vs E71T-GS: 45% composition overlap. Significantly different materials serving different application areas.
E7018-1 H4R vs E71T-GS
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.
E71T-GS
Self-shielded flux cored wire — no external shielding gas required. Single-pass, all-position. Tensile strength 70 ksi (485 MPa). The go-to wire for field welding, outdoor repair, farm equipment, fencing and hobby welding where gas bottles are impractical. Generates its own protective atmosphere from flux decomposition. Higher spatter and fume than gas-shielded FCAW but unbeatable portability. Popular in small MIG welders for DIY and light fabrication.
| E7018-1 H4R | E71T-GS | |
|---|---|---|
| Material Number | — | — |
| Category | Welding | Welding |
| Standard | AWS A5.1 | AWS A5.20 |
Chemical composition (wt%)
| Element | E7018-1 H4R | E71T-GS | Overlap |
|---|---|---|---|
| C | ≤ 0.08% | ≤ 0.12% | OK |
| Si | 0.3–0.6% | ≤ 0.9% | OK |
| Mn | 1–1.6% | ≤ 1.75% | OK |
| P | ≤ 0.025% | — | — |
Mechanical properties
| Property | E7018-1 H4R | E71T-GS | Unit |
|---|---|---|---|
| Tensile Strength | ≥ 485 | ≥ 485 | MPa |
| Yield Strength | ≥ 400 | ≥ 400 | MPa |
| Elongation | ≥ 22 | ≥ 20 | % |
Compatibility Assessment
E7018-1 H4R and E71T-GS have significantly different compositions (45% 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 E71T-GS?
E7018-1 H4R and E71T-GS have a 45% composition overlap. They are generally not directly interchangeable.
Can I replace E7018-1 H4R with E71T-GS?
Generally not recommended. The compositions differ significantly (45% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between E7018-1 H4R and E71T-GS?
The main differences are in the following elements: overall alloying content. E7018-1 H4R is a Welding grade, while E71T-GS 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.