Inconel 740H

Inconel 740H
Inconel 740H is a precipitation‑hardened nickel‑base superalloy designed for ultra‑supercritical power systems. It delivers exceptional high‑temperature creep strength, excellent oxidation, and coal ash corrosion resistance. With stable microstructure, good weldability, and resistance to carburization and sulfidation, it performs reliably at elevated temperatures and pressures. Approved by ASME Boiler Code, it combines long‑term structural stability and durability for extreme high‑heat and high‑stress energy applications.
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Product Specification

Equivalent Grade

UNS: N07740

W.Nr.: 2.4663

Chinese Standard: GH4742

Standard

● Sheet/Plate: ASTM B622

Seamless Pipe: ASTM B619

Bar: ASTM B637

Complies with ASME Code Case 2702

Alloy TypeNickel-Chromium-Cobalt Based Precipitation Hardening Superalloy (γ' Phase Strengthened)
StandardSheet, Bar, Pipe, Tube, Fittings, Flange, Welding Products, etc.
Key Properties

● Excellent high-temperature strength, outstanding creep rupture strength at 700-760℃

Good resistance to coal ash corrosion, oxidation, carburization and sulfidation

Good hot and cold forming performance, excellent weldability, proper post-weld heat treatment required

Applicable EnvironmentAdvanced Ultra-Supercritical (A-USC) power station environment, high-temperature and high-pressure steam environment, coal-fired boiler scenarios, high-temperature flue gas environment, SCO₂ cycle systems
Typical ApplicationsPower Station Boiler Superheater/Reheater Tubes, Main Steam Headers, High-Temperature Heat Exchangers, Fgd Equipment, Nuclear And New Energy Power Generation Equipment Components, Thick-Walled Pipes, etc.


Packaging and Shipping

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Strength Demonstration

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Complete Products

We offer a comprehensive range of steel products for diverse industrial needs

Professional Services

We provide one-stop professional steel services with dedicated technical support

Customization Supported

We support tailored steel customization to match your specific project requirements

Quality Control

We implement strict full-process quality control for all steel products supplied

Fast Delivery

We ensure fast and on-time delivery for all your steel order requirements

After-Sales Service

We offer reliable all-round after-sales service for all steel product purchases

Production and Testing

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FAQ

Q: What is the terms of packing?
A:

Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirement.

Q: Could you provide the samples?
A:

Yes, we could provide the free samples on conditions it is available in stocks, however, the transportation fee is borne by buyer.

Q: How could you guarantee your products?
A:

Each piece of products is manufactured by certified workshops, inspected piece by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.

Q: Do you make custom products?
A:

Yes, we could make custom products according to your specific requirements.

Q: Do you accept third-party inspection?
A:

We accept third-party inspections such as SGS, V-trust, TUV, DNV, etc.

Q: Can I go to your company to visit?
A:

Of course, we welcome customers from all over the world to visit our factory.

Q: What product information do I need to provide?
A:

You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.

Q: What is your delivery time?
A:

For stocks, we could transport the goods to loading port within 7 days after we received your deposit. For production period, it usually takes about 15 days-30 days after receiving the deposit.

Q: Do you have any discounts for large orders?
A:

Our company has the ability to supply large projects and offers excellent preferential policies for large orders.

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