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): Elevate your welding experience with superior, deeper penetration ideal for thicker sections by utilizing a premium blend of argon and helium in a 75%-25% ratio. This sophisticated combination not only guarantees robust weld quality but also significantly enhances the structural integrity of your projects.
Parameters Overview (Refer to Table 2 for comprehensive and detailed specifications):
Preheat/Cleaning: Achieving the perfect weld starts with a pristine surface. Ensure the elimination of all traces of oil and oxides through either mechanical or chemical cleaning methods. This critical step lays the foundation for optimal welding results.
Interpass Temperature: Diligently maintain an interpass temperature of ≤150°C to proficiently avert the formation of carbide precipitation, thereby safeguarding the weld's integrity and longevity.
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, offering precise and controlled welding for superior results.
MIG 0.9-1.6 150-250 26-33 75% Argon + 25% Helium, ensuring enhanced penetration and unparalleled stability.
Source:
7. Procurement and Handling Guidelines
Packaging: The product is thoughtfully packaged in coils and spools, available in diverse diameters ranging from 0.8 to 5.0 mm to suit your specific needs; Available in convenient 10-25 kg units, facilitating easy handling and efficient storage, optimized for your operational convenience.
Storage: Preserve quality by storing in a dry environment, maintaining humidity levels below 60% to avert moisture absorption that could compromise weld quality.
8. Common Challenges & Their Effective Solutions
Porosity: Typically caused by gas impurities → Ensure the use of high-purity argon (99.99%) to meticulously eliminate impurities and achieve flawless welds of the highest caliber.
Hot Cracking: Mitigate risk by employing a strategy of low heat input and minimizing joint restraints, thereby preserving the integrity and excellence of the weld.
| 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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