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 achieving unparalleled and deeper penetration in thicker sections, it's recommended to use an argon-helium blend with a precise 75%-25% ratio. This powerful combination assures exceptional weld quality and significantly enhances structural integrity, making it ideal for robust applications.
Parameters Overview (Refer to Table 2 for detailed and comprehensive specifications):
Preheat/Cleaning: To ensure a pristine welding surface, it is vital to meticulously eliminate all traces of oils and oxides. This can be expertly achieved through either mechanical or chemical cleaning methods, ensuring optimal welding outcomes.
Interpass Temperature: Diligently maintain a temperature of ≤150°C to prevent the undesirable formation of carbide precipitation, which can critically compromise weld integrity. Adherence to this parameter is essential for maintaining weld quality.
Table 2: Standardized Welding Parameters for Optimal Performance and Unmatched Results
Process Diameter (mm) Current (A) Voltage (V) Shielding Gas
TIG 0.9-3.2 60-220 (DCEN) 12-20 100% Argon: Ensures precise and controlled welding operations.
MIG 0.9-1.6 150-250 26-33 75% Argon + 25% Helium: Guarantees enhanced penetration and stability, ideal for demanding tasks.
Source:
7. Procurement and Handling Guidelines for Efficient Use
Packaging: Offered in versatile coils and spools with diameters ranging from 0.8 to 5.0 mm, catering to diverse needs. Conveniently available in 10-25 kg units, facilitating easy handling and storage, perfectly suited for various operational environments.
Storage: Ensure storage in a dry environment with humidity levels consistently below 60% to prevent any moisture absorption that could detrimentally affect weld quality.
8. Common Challenges & Their Effective Solutions for Superior Welding Outcomes
Porosity: Often arises due to gas impurities, impacting weld quality. → Ensure the utilization of high-purity argon (99.99%) to effectively eliminate impurities, achieving flawless and impeccable welds.
Hot Cracking: Mitigate the risk by employing low heat input and minimizing joint restraints, ensuring the preservation of 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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