Standard	Classification
AWS A5.11	ENiCrFe‑7 (ENiCrFeNb‑7)
ASME II, Part C, SFA‑5.11	ENiCrFe‑7
UNS	W86152
EN ISO 14172	E Ni 6152 (NiCr30Fe9Nb)
GB/T 13814	ENiCrFe‑7

Custom specifications available upon request.

For information regarding certifications and industry approvals, please contact our Technical Department.

Element	C	Mn	Si	S	P	Ni	Cr	Fe	Nb+Ta	Cu	Mo
Content (%)	0.05 max	5.0 max	0.75 max	0.015 max	0.020 max	Balance	28.0–31.5	7.0–12.0	1.0–2.5	0.50 max	0.50 max

The high chromium content (28.0–31.5%) provides exceptional resistance to stress corrosion cracking in aggressive environments, while the niobium and tantalum addition refines the weld microstructure and enhances resistance to intergranular corrosion. The low carbon content minimizes carbide precipitation, further improving corrosion resistance.

Note: The above values are minimum requirements per AWS A5.11. Typical values are for reference only and may vary depending on welding parameters, joint design, and base material condition

Ø Outstanding stress corrosion cracking (SCC) resistance: High chromium content (28.0–31.5%) provides superior resistance to SCC in nuclear radiation, pure water, and aggressive corrosive environments

Ø Excellent intergranular corrosion (IGC) resistance: Low carbon content and niobium/tantalum additions prevent carbide precipitation at grain boundaries, eliminating susceptibility to intergranular attack

Ø Low‑hydrogen coating: Minimizes hydrogen‑induced cracking, particularly critical for high-strength steels and thick sections in nuclear applications

Ø Excellent high-temperature oxidation resistance: Scaling resistance up to approximately 1100°C (2010°F) in air

Ø Good resistance to hot cracking: Niobium addition refines the weld microstructure and reduces solidification cracking tendency

Ø Smooth arc characteristics: Low spatter, easy slag removal, stable metal transfer, and good porosity resistance

Ø All-position weldability: Excellent operability in flat, horizontal, vertical up, and overhead positions

Ø 100% joint efficiency: Weld metal exhibits mechanical properties equivalent to the base material

Polarity: Direct Current, Electrode Positive (DCEP / DC reverse polarity)

Pre‑weld Preparation:

• Clean base metal thoroughly to remove all oil, grease, paint, rust, moisture, and other contaminants prior to welding
• For nuclear and high-purity applications, ensure strict cleanliness to prevent contamination

Electrode Conditioning:

• Electrodes must be baked at 300–350°C (570–660°F) for 1 hour before use to remove moisture from the low‑hydrogen coating
• Do not rebake electrodes more than twice

Recommended Current Range:

Electrode Diameter (mm)	Current Range (Amperes)
φ2.5	50–70
φ3.2	70–110
φ4.0	110–170

For vertical and overhead welding, reduce current by approximately 10–15%.

Welding Techniques:

Ø Use a short arc length to minimize atmospheric contamination and prevent porosity

Ø Control interpass temperature below 150°C (300°F) to reduce cracking tendency

Ø Minimize heat input; if weaving, do not exceed twice the electrode diameter in width

Ø Remove slag thoroughly between passes

Ø Preheating is generally not required for most applications

Ø For thick sections or high-constraint structures, consider preheating of 80–150°C (175–300°F)

Diameter options:

• 2.5 mm / 3.2 mm / 4.0 mm / 5.0 mm

Packaging:

• 2.5 kg / 4.5 kg hermetically sealed plastic packages
• 10 kg / 20 kg cardboard boxes
• Custom packaging available upon request

Ø Reliable production quality meeting AWS A5.11 and ASME SFA‑5.11 requirements

Ø Strict quality control for nickel‑based alloy electrodes

Ø Low‑hydrogen coating ensures smooth arc, low spatter, and easy slag removal

Ø Global export experience with on‑time delivery

Ø Technical support for welding procedure qualification

1. What is ENiCrFeNb-7 (ENiCrFe-7) welding electrode used for?

ENiCrFeNb-7 is primarily used for welding Inconel® 690 (UNS N06690) and other nickel‑chromium‑iron alloys, particularly in nuclear power plant construction (reactor pressure vessels, steam generators, pressurizers). It is also used for dissimilar metal joints between nickel alloys and stainless or low‑alloy steels, and for surfacing corrosion resistant layers on steel substrates.

2. What are the key corrosion resistance properties of ENiCrFeNb-7?

It provides outstanding resistance to stress corrosion cracking (SCC) in nuclear radiation and pure water environments, as well as excellent intergranular corrosion (IGC) resistance. The high chromium content (28.0–31.5%) is key to its superior SCC performance.

3. Is ENiCrFeNb-7 the same as ENiCrFe-7?

Yes, ENiCrFeNb-7 and ENiCrFe-7 refer to the same AWS A5.11 classification. The "Nb" designation in the name explicitly indicates the presence of niobium (columbium) in the alloy composition, which is an essential element for the specification.

4. What polarity and current are required?

ENiCrFeNb-7 operates with Direct Current, Electrode Positive (DCEP / DC reverse polarity). Refer to the recommended current range based on electrode diameter.

5. What is the recommended interpass temperature?

Interpass temperature should be controlled below 150°C (300°F) to prevent weld metal overheating and reduce cracking tendency. Effective welding below 150°C is recommended for reduced cracking tendency.

6. How should ENiCrFeNb-7 electrodes be stored and conditioned?

ENiCrFeNb-7 electrodes have a low‑hydrogen coating and must be stored in a dry environment. Before use, electrodes should be baked at 300–350°C (570–660°F) for 1 hour to remove moisture and prevent hydrogen‑induced cracking. Do not rebake more than twice.

7. Is preheating required for ENiCrFeNb-7 welding?

Preheating is generally not necessary for most applications. However, for thick sections or high-constraint structures, preheating of 80–150°C (175–300°F) may be beneficial.

8. What is the maximum service temperature for ENiCrFeNb-7?

ENiCrFeNb-7 weld metal exhibits scaling resistance up to approximately 1100°C (2010°F) in air. For long-term service in aggressive environments, consult the applicable design codes and base material specifications.

Contact our technical team for alloy selection support, product datasheets, welding recommendations, or a customized quotation for your project.