ERNiFeCr-1
1. This extraordinary nickel-based welding wire (Ni-Cr-Fe-Mo-Cu system) is meticulously designed for high-performance tasks in both corrosive environments and extreme thermal conditions, ensuring remarkable durability and resilience. It belongs to the prestigious AWS classification A5.14 ERNiFeCr-1 and is synonymous with SNi8065 (ISO 18274) and NiFe30Cr21Mo3 (European standard), reflecting its global standard compliance.
Key Advantages:
Corrosion Resistance: Triumphs in reducing media, such as sulfuric and phosphoric acids, showcasing unmatched resistance to stress corrosion cracking, pitting, and crevice corrosion.
Thermal Stability: Reliably maintains its mechanical strength from cryogenic levels all the way up to a sizzling 900°C.
Versatility: Ideal for welding dissimilar metals, such as nickel alloys to steel, and effortlessly handles cladding operations with precision.
2. Chemical Composition
ERNiFeCr-1's composition (see Table 1) is expertly optimized to ensure impeccable weld integrity:
High Nickel (38-46%) and Iron (≥22%): These elements create a ductile matrix, harmonizing thermal expansion and strength for superior performance.
Chromium (19.5-23.5%) and Molybdenum (2.5-3.5%): These components enhance oxidation resistance and provide stability even in aggressive chlorides and sulfides.
Low Carbon (≤0.05%) and Impurities: Thoughtfully minimized to reduce the risk of intergranular corrosion.
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, proudly meeting the AWS A5.14 minimum requirement.
Elongation: A remarkable ~25-34%, demonstrating excellent ductility and flexibility.
Impact Toughness: Skillfully retains its properties even in sub-zero environments, making it perfect for applications like cryogenic storage tanks.
4. Technical Standards and Certification
Governed by:
AWS A5.14/ASME SFA-5.14: Enforces stringent chemical and mechanical specifications.
ISO 18274: Guarantees global standardization under SNi8065.
F-Number 45 (ASME IX): Authorizes welding procedures for crucial pressure vessels.
Quality Control: Mandates Material Test Certificates (MTC) and requires passing RT/PT nondestructive testing for assurance.
5. Applications
Primary Use: Specifically designed for welding INCOLOY 825 (UNS N08825) and similar Ni-Fe-Cr-Mo-Cu alloys.
Critical Industries:
Petrochemical: Essential for reactors and acid-processing equipment.
Nuclear: Vital for steam generator tubes and pressure vessels.
Aerospace: Perfect for turbine components that endure thermal cycling.
6. Welding Process Guidelines
Methods:
TIG (GTAW): Utilizes 100% argon shielding, making it ideal for precision joints, especially in thin tubes.
MIG (GMAW): For achieving exceptional penetration in thicker materials, a 75%-25% argon-helium blend is recommended. This strategic combination not only ensures robust weld quality but also significantly enhances structural integrity, providing you with confidence in the durability of your welds.
Parameters Overview (For in-depth specifications, please refer to Table 2):
Preheat/Cleaning: The elimination of oil and oxides is paramount. Utilize either mechanical or chemical cleaning methods to secure a pristine surface, thereby guaranteeing optimal welding outcomes and superior weld quality.
Interpass Temperature: Carefully maintain a temperature not exceeding 150°C. This meticulous control is essential to prevent carbide precipitation, thus preserving the weld's integrity and longevity.
Table 2: Standardized Welding Parameters for Achieving 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, ensuring exceptional quality and stability.
MIG 0.9-1.6 150-250 26-33 75% Argon + 25% Helium to achieve enhanced penetration and unparalleled stability in your welding processes.
Source:
7. Procurement and Handling Guidelines
Packaging: Offered in coils and spools, with diameters ranging from 0.8 to 5.0 mm, catering to a variety of needs and applications. Available in convenient 10-25 kg units, facilitating easy handling and storage solutions for all your welding needs.
Storage: Ensure storage in a dry environment with humidity levels kept below 60% to prevent moisture absorption, which could otherwise 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 effectively eliminate impurities and achieve flawless, high-quality welds.
Hot Cracking: Mitigate the risk by using low heat input and minimizing joint restraints, thereby maintaining weld integrity and ensuring long-lasting results.
| 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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