E7018 vs E7018-1 H4R: 69% composition overlap. Moderate differences, generally not direct substitutes.
E7018 vs E7018-1 H4R
Side-by-side chemical composition and mechanical property comparison.
Overview
E7018
The world's most widely used low-hydrogen SMAW (stick) welding electrode. Iron powder + calcium fluoride coating produces smooth, easy-to-control arc with minimal spatter and easy slag removal. Low hydrogen designation prevents hydrogen-induced cracking in structural joints. All-position welding (1 = flat, horizontal, vertical, overhead). AC or DCEP. Minimum 480 MPa tensile strength. Must be stored in heated ovens (250-300°F) to prevent moisture pickup. Used for structural steel, bridges, buildings, pressure vessels, and all code-compliant fabrication per AWS D1.1.
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.
| E7018 | E7018-1 H4R | |
|---|---|---|
| Material Number | — | — |
| Category | Welding | Welding |
| Standard | AWS A5.1 | AWS A5.1 |
Chemical composition (wt%)
| Element | E7018 | E7018-1 H4R | Overlap |
|---|---|---|---|
| C | ≤ 0.15% | ≤ 0.08% | OK |
| Si | ≤ 0.75% | 0.3–0.6% | OK |
| Mn | ≤ 1.6% | 1–1.6% | OK |
| P | ≤ 0.04% | ≤ 0.025% | OK |
Mechanical properties
| Property | E7018 | E7018-1 H4R | Unit |
|---|---|---|---|
| tensile_strength | ≥ 480 | — | MPa |
| yield_strength | ≥ 400 | — | MPa |
| elongation | ≥ 22 | — | % |
Compatibility Assessment
E7018 and E7018-1 H4R have moderate differences (69% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is E7018 the same as E7018-1 H4R?
E7018 and E7018-1 H4R have a 69% composition overlap. They are generally not directly interchangeable.
Can I replace E7018 with E7018-1 H4R?
Generally not recommended. The compositions differ significantly (69% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between E7018 and E7018-1 H4R?
The main differences are in the following elements: overall alloying content. E7018 is a Welding grade, while E7018-1 H4R 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.