E71T-GS vs ER70S-6: 23% composition overlap. Significantly different materials serving different application areas.
E71T-GS vs ER70S-6
Side-by-side chemical composition and mechanical property comparison.
Overview
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.
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.
| E71T-GS | ER70S-6 | |
|---|---|---|
| Material Number | — | K11140 |
| Category | Welding | Welding |
| Standard | AWS A5.20 | AWS A5.18 |
Chemical composition (wt%)
| Element | E71T-GS | ER70S-6 | Overlap |
|---|---|---|---|
| C | ≤ 0.12% | 0.06–0.15% | Partial |
| Si | ≤ 0.9% | 0.8–1.15% | Partial |
| Mn | ≤ 1.75% | 1.4–1.85% | Partial |
| P | — | ≤ 0.025% | — |
Mechanical properties
| Property | E71T-GS | ER70S-6 | Unit |
|---|---|---|---|
| Tensile Strength | ≥ 485 | — | MPa |
| Yield Strength | ≥ 400 | — | MPa |
| Elongation | ≥ 20 | — | % |
Compatibility Assessment
E71T-GS and ER70S-6 have significantly different compositions (23% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is E71T-GS the same as ER70S-6?
E71T-GS and ER70S-6 have a 23% composition overlap. They are generally not directly interchangeable.
Can I replace E71T-GS with ER70S-6?
Generally not recommended. The compositions differ significantly (23% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between E71T-GS and ER70S-6?
The main differences are in the following elements: C, Si, Mn. E71T-GS 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.