ER 312 Welding Wire
OVERVIEW OF ER 312 WELDING WIRE
ER 312 Welding Wire is a high-alloy stainless steel filler metal known for its exceptional strength, crack resistance, and excellent weldability. It is specifically designed for dissimilar metal welding and hard-to-weld steels where high mechanical strength is required.
With a high chromium and nickel content, ER 312 welding wire produces weld metal with a fully austenitic–ferritic microstructure, offering superior resistance to cracking, abrasion, and impact.
CHEMICAL COMPOSITION
| Element | Percentage (%) |
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | 1.00 – 2.50 |
| Silicon (Si) | ≤ 0.90 |
| Chromium (Cr) | 28.0 – 32.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
MECHANICAL PROPERTIES
| Property | Typical Value |
| Tensile Strength | ≥ 760 MPa |
| Yield Strength | ≥ 450 MPa |
| Elongation | ≥ 22% |
| Hardness | ~240 HB |
ER 312 welding wire delivers high strength and excellent resistance to cracking, even under severe stress conditions.
PHYSICAL PROPERTIES
| Property | Value |
| Density | 7.8 g/cm³ |
| Melting Range | 1400 – 1450°C |
| Thermal Conductivity | Low |
| Electrical Resistivity | High |
| Magnetic Properties | Slightly magnetic |
APPLICATIONS
ER 312 Welding Wire is widely used in demanding industrial applications, including:
- Dissimilar metal welding (carbon steel to stainless steel)
- Repair and maintenance welding
- Tool steels and high-strength steels
- Wear-resistant and abrasion-resistant components
- Shafts, gears, rollers, and dies
- Heavy engineering and fabrication industries
- Mining and earth-moving equipment
Its versatility makes ER 312 an excellent choice for maintenance, repair, and surfacing applications.
EQUIVALENT GRADES
| AWS A5.9 | ER312 |
| EN ISO 14343-A | W 29 9 |
| DIN | 1.4337 |
| JIS | YS312 |
| BS | 312 |
ER 312 TIG Wire
ER 312 MIG Wire
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