ERNiCrMo-4 Nickel Alloy Welding Wire
ERNiCrMo-4 is a nickel-chromium-molybdenum welding filler metal designed for high-performance applications requiring exceptional corrosion resistance. Below is a detailed technical overview based on industry standards and manufacturer specifications:
1. Composition & Specifications
Chemical Composition:
Nickel (Ni): ≥50%
Chromium (Cr): 14.5-16.5%
Molybdenum (Mo): 15-17%
Tungsten (W): 3.0-4.5%
Iron (Fe): 4.0-7.0%
Low impurities (C ≤ 0.02%, S ≤ 0.015%, P ≤ 0.02%) .
Standards Compliance: AWS A5.14 (welding wire), AWS A5.11 (covered electrode) .
2. Physical & Mechanical Properties
Physical:
Density: 8.9 g/cm³
Melting Range: 1,325-1,370°C .
Mechanical:
Tensile Strength: ≥690 MPa
Yield Strength: ≥400 MPa
Elongation: ≥22% (typical values: 720 MPa tensile, 560 MPa yield, 40% elongation) .
Metallurgical Structure: Face-centered cubic (FCC) austenitic matrix .
3. Key Applications
Primary Use: Welding Hastelloy C-276 and similar Ni-Cr-Mo alloys 36.
Dissimilar Metal Joining:
Nickel alloys ↔ Stainless steel/low-alloy steel
Nickel alloys ↔ Carbon steel .
Cladding & Repair: Surface overlay on steel to enhance corrosion resistance .
Industries: Chemical processing, oil/gas, aerospace, flue gas desulfurization (FGD), and cryogenic (e.g., -196°C) services.
4. Welding Process Guidelines
Methods: TIG (GTAW), MIG (GMAW), SMAW (for ENiCrMo-4 variant) .
Parameters:
Preheat: Electrodes baked at 350°C for 1 hour (low-hydrogen practice) .
Gas Shielding: ≥99.99% pure argon; flow rate 10-15 L/min.
Current: DC+ polarity; 70-140 A (varies with diameter).
Critical Practices:
Clean base metal (remove rust/oil/moisture).
Low heat input and interpass temperature to avoid cracking.
5. Product Forms & Availability
Wire:
Diameters: 0.6-3.2 mm (spooled for MIG/TIG).
Electrode (SMAW):
Diameters: 1.6mm-5.0 mm .
6. Performance Advantages
Corrosion Resistance: Superior performance in:
Acidic media (sulfuric, hydrochloric acids)
Chloride-induced pitting/crevice corrosion.
Crack Resistance: Low susceptibility to stress-corrosion cracking (SCC) due to high Mo/W content
Product Description
| AWS A5.4 |
ERNi-1 |
ERNiCu-7 |
ERNiCr-3 |
ERNiCrFe-5 |
ERNiCrMo-3 |
ERNiCrMo-4 |
ERNiCrMo-7 |
| TS(N/mm2) |
460 |
541 |
671 |
560 |
790 |
729 |
780 |
| EL(%) |
30 |
39 |
39 |
30 |
43 |
33 |
35 |
| C |
0.02 |
0.02 |
0.03 |
0.03 |
0.0037 |
0.002 |
0.05 |
| Mn |
0.3 |
1.7 |
3.05 |
1 |
0.03 |
0.12 |
0.6 |
| Si |
0.16 |
0.44 |
0.37 |
0.04 |
0.029 |
0.07 |
0.02 |
| P |
0.0012 |
0.007 |
/ |
0.004 |
0.003 |
0.003 |
0.003 |
| Ti |
2.3 |
/ |
0.01 |
/ |
0.088 |
/ |
/ |
| S |
0.005 |
0.008 |
/ |
0.002 |
0.001 |
0.0015 |
|
| Cr |
/ |
/ |
19.86 |
15.7 |
21.95 |
15.9 |
16.7 |
| Ni |
96.5 |
65.68 |
72.8 |
75.06 |
64.65 |
REM |
REM |
| Cu |
/ |
REM |
0.06 |
0.03 |
0.009 |
0.008 |
/ |
| Mo |
/ |
/ |
/ |
0.03 |
9.04 |
15.9 |
15.8 |
| Nb |
/ |
/ |
2.4 |
2.3 |
3.61 |
/ |
/ |
| V |
/ |
/ |
/ |
/ |
/ |
0.01 |
/ |
| Fe |
/ |
0.7 |
0.23 |
7.9 |
0.19 |
4.12 |
2.2 |
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