ERNiFeCr-1
1.It is a nickel-based welding wire (Ni-Cr-Fe-Mo-Cu system) designed for high-performance applications in corrosive and extreme thermal environments. It belongs to AWS classification A5.14 ERNiFeCr-1 and is synonymous with SNi8065 (ISO 18274) and NiFe30Cr21Mo3 (European standard).
Key Advantages:
Corrosion Resistance: Excels in reducing media (e.g., sulfuric/phosphoric acids) and resists stress corrosion cracking, pitting, and crevice corrosion.
Thermal Stability: Maintains mechanical integrity from cryogenic temperatures up to 900°C.
Versatility: Suitable for welding dissimilar metals (e.g., nickel alloys to steel) and cladding operations.
2. Chemical Composition
ERNiFeCr-1's composition (see Table 1) is optimized for weld integrity:
High Nickel (38-46%) and Iron (≥22%): Form a ductile matrix, balancing thermal expansion and strength.
Chromium (19.5-23.5%) and Molybdenum (2.5-3.5%): Enhance oxidation resistance and stability in chlorides/sulfides
Low Carbon (≤0.05%) and Impurities: Minimize intergranular corrosion risks.
Table 1: Chemical Composition (Weight %)
Element Ni Fe Cr Mo Cu Mn Si Others
Range 38-46% ≥22% 19.5-23.5% 2.5-3.5% 1.5-3.0% ≤1% ≤0.5% Ti:0.6-1.2%; Al≤0.2%
Source:3. Mechanical Properties
As-Welded Performance:
Tensile Strength: ≥550 MPa (meets AWS A5.14 minimum) .
Elongation: ~25-34% (excellent ductility).
Impact Toughness: Retains properties in sub-zero environments (e.g., cryogenic storage tanks).
4. Technical Standards and Certification
Governed by:
AWS A5.14/ASME SFA-5.14: Mandates chemical/mechanical specs.
ISO 18274: Global standardization (SNi8065) .
F-Number 45 (ASME IX): Qualifies welding procedures for pressure vessels .
Quality Control: Requires Material Test Certificates (MTC) and passes RT/PT nondestructive testing .
5. Applications
Primary Use: Welding INCOLOY 825 (UNS N08825) and similar Ni-Fe-Cr-Mo-Cu alloys.
Critical Industries:
Petrochemical: Reactors, acid-processing equipment.
Nuclear: Steam generator tubes, pressure vessels .
Aerospace: Turbine components exposed to thermal cycling.
6. Welding Process Guidelines
Methods:
TIG (GTAW): 100% argon shielding; ideal for precision joints (e.g., thin tubes) .
MIG (GMAW): For superior, deeper penetration in thicker sections, use an argon-helium blend in a 75%-25% ratio. This combination ensures robust weld quality and enhances structural integrity.
Parameters Overview (Refer to Table 2 for detailed specifications):
Preheat/Cleaning: It is crucial to eliminate any traces of oil and oxides by employing either mechanical or chemical cleaning methods. This step is essential in ensuring a pristine surface for optimal welding results.
Interpass Temperature: Maintain a temperature of ≤150°C meticulously to avert the formation of carbide precipitation, which can compromise the weld's integrity.
Table 2: Standardized Welding Parameters for Optimal Performance
Process Diameter (mm) Current (A) Voltage (V) Shielding Gas
TIG 0.9-3.2 60-220 (DCEN) 12-20 100% Argon for precise and controlled welding.
MIG 0.9-1.6 150-250 26-33 75% Argon + 25% Helium for enhanced penetration and stability.
Source:
7. Procurement and Handling Guidelines
Packaging: Available in coils and spools with diameters ranging from 0.8 to 5.0 mm; Available in convenient 10-25 kg units for easy handling and storage.
Storage: Store in a dry environment with humidity levels below 60% to prevent any moisture absorption that could affect weld quality.
8. Common Challenges & Their Effective Solutions
Porosity: Often a result of gas impurities → Ensure the use of high-purity argon (99.99%) to eliminate impurities and achieve flawless welds.
Hot Cracking: Reduce the risk by employing low heat input and minimizing joint restraints to maintain weld integrity.
| 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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