GB/T 4237 06Cr19Ni9NbN（347H）Stainless Steel Plate Supplie

06Cr19Ni9NbN Stainless Steel Coil & Plate | GB/T 4237 06Cr19Ni9NbN（347H) Stainless Steel Sheet Manufacturer & Exporter – Gangsteel

Gangsteel is a specialized manufacturer and global exporter of GB/T 4237 06Cr19Ni9NbN stainless steel hot-rolled coils, plates, and wide heavy plates. Internationally recognized as Grade 347H (high-carbon stabilized variant of 347), 06Cr19Ni9NbN is a niobium-stabilized austenitic stainless steel designed for superior high-temperature strength, exceptional resistance to intergranular corrosion, and excellent performance in prolonged elevated-temperature service (up to 800–900°C). The addition of niobium (Nb ≥ 10 × C) binds carbon, preventing chromium carbide precipitation and sensitization in the heat-affected zone during welding or long-term heat exposure.

With 18–20% Cr, 9–13% Ni, and controlled high carbon (0.04–0.10%), 347H provides better creep and rupture strength than standard 304/321 at temperatures above 500°C, making it the preferred material for high-temperature welded structures where both corrosion resistance and structural integrity are critical.

Produced under GB/T 4237-2015 (Stainless Steel Hot-Rolled Sheets and Strips), Gangsteel supplies 06Cr19Ni9NbN in thicknesses from 2 mm to 500 mm and widths up to 4200 mm — one of the widest hot-rolling capabilities available worldwide. Our products are delivered in standard hot-rolled finishes No.1 (annealed & pickled) and 2D (annealed & pickled dull) and are exported globally to petrochemical, power generation, furnace construction, heat exchanger, boiler, and high-temperature piping industries.

Why Choose Gangsteel for 06Cr19Ni9NbN (347H) Hot-Rolled Stainless Steel?

Gangsteel’s wide heavy-plate mills enable single-piece rolling of large furnace tubes, pressure vessel shells, and reformer components, minimizing welds and improving service life. We maintain strict control over niobium and carbon to ensure consistent high-temperature creep strength and intergranular corrosion resistance.

Chemical Composition of GB/T 4237 06Cr19Ni9NbN

Standard Chemical Composition Table

Gangsteel ensures precise Nb/C ratio and controlled carbon for optimal creep rupture and intergranular corrosion performance.

Mechanical Properties

Mechanical Properties Table (Annealed Condition)

347H maintains useful strength and creep resistance at elevated temperatures (better than 304/321).

Physical Properties

Physical Properties Table

Equivalent Materials Comparison Table

Key Insight: 06Cr19Ni9NbN (347H) provides superior creep and rupture strength at 500–900°C compared to 347 or 321 due to higher carbon content.

Manufacturing Process: Hot Rolled at Gangsteel

Gangsteel's hot-rolling process for 06Cr19Ni9NbN includes:

1. Electric arc furnace + AOD refining → precise Nb/C control
2. Continuous casting into wide slabs
3. Reheating to 1150–1250°C
4. Hot rolling on wide heavy-plate mills (up to 4200 mm width)
5. Controlled cooling, leveling, and descaling
6. Solution annealing + pickling for No.1 finish or shot blasting + pickling for 2D finish
7. Edge trimming, coil splitting, or cut-to-length

Thickness range: 2 mm – 500 mm Width range: up to 4200 mm Length: up to 18 m (plate) or coil form

Finishes: No.1 (annealed & pickled), 2D (annealed & pickled dull)

Available Forms, Sizes, and Specifications

• Hot-rolled coils: 2.0–25.0 mm thick, up to 4200 mm wide
• Hot-rolled plates: 2.0–500 mm thick, up to 4200 mm wide × 18 m long
• Cut-to-size plates, slit coils, custom blanks

All compliant with GB/T 4237-2015; optional third-party certification (SGS, TUV, BV).

Key Applications of 06Cr19Ni9NbN (347H) Hot-Rolled Products

• High-temperature furnace tubes and radiant tubes
• Petrochemical reformers, crackers, and pyrolysis coils
• Boiler superheater and reheater tubes
• Heat exchanger tubes and pressure vessel components
• Exhaust manifolds and high-temp piping
• Cement kiln preheaters and calciners

Advantages of Choosing 06Cr19Ni9NbN (347H)

• Excellent resistance to intergranular corrosion at 425–900°C
• Superior high-temperature creep and rupture strength
• Good oxidation and carburization resistance
• Weldable without post-weld annealing in most cases
• Good formability and fabricability
• Cost-effective stabilized grade for high-temp service
• Wide global acceptance in petrochemical and power industries

Corrosion and Oxidation Resistance

Forms stable Cr oxide scale; resists oxidation, carburization, and sulfidation in oxidizing atmospheres up to 900°C. Nb stabilization prevents intergranular corrosion in sensitized range. Good in mild corrosives; not for severe chlorides (use 316/317).

Weldability and Fabrication

Good weldability with TIG/MIG; Nb stabilization eliminates sensitization. Use ER347 or ER347H fillers. High ductility supports forming; annealing may be needed post-weld for critical uses.

Why Choose Gangsteel for GB/T 4237 06Cr19Ni9NbN?

• Industry-leading width (up to 4200 mm) and thickness (up to 500 mm)
• Full traceability and third-party inspection
• Competitive pricing with large-scale production
• Fast lead times and global export expertise
• Technical support for high-temp welding, creep design, and application

Quality Assurance and Certifications

Every heat is tested for chemistry, mechanical properties, surface quality, and dimensions. Full MTRs (EN 10204 3.1) and third-party certification available.

Packaging, Shipping, and Logistics

Coils eye-to-wall/eye-to-sky on steel pallets; plates bundled with skids; seaworthy export packaging with waterproof wrapping and edge protection.

FAQ

Q1: What is the main difference between 347H (06Cr19Ni9NbN) and standard 347?

A: 347H has higher carbon (0.04–0.10%) for improved high-temperature creep and rupture strength, while 347 has lower carbon (≤0.08%) for better weldability in general use. 347H is preferred for prolonged high-temp service.

Q2: Can 06Cr19Ni9NbN be used in chloride-containing environments?

A: Not recommended for long-term exposure to chlorides (pitting risk). Use 316L, 317L, or 444 for better chloride resistance.

Q3: What finishes are available under GB/T 4237 for hot-rolled 347H?

A: Standard finishes are No.1 (annealed & pickled) and 2D (annealed & pickled dull). No.1 is most common for further processing.

Q4: What is the maximum width and thickness Gangsteel can produce for 06Cr19Ni9NbN?

A: Up to 4200 mm wide and 500 mm thick in hot-rolled plates; coils typically 2–25 mm thick.

Q5: Is 347H weldable? What filler should be used?

A: Yes, good weldability. Use ER347 or ER347H fillers to match high-temperature properties.

Q6: Does Gangsteel offer third-party inspection for GB/T 4237 347H material?

A: Yes — SGS, TUV, BV, or customer-nominated agencies are welcome at any stage.

Q7: What is the lead time for hot-rolled 06Cr19Ni9NbN coils or plates?

A: Standard sizes from stock: 7–15 days. Custom wide/heavy plates: 25–45 days depending on thickness and quantity.

Q8: Can Gangsteel provide 347H with BA or 2B finish?

A: Hot-rolled material is No.1 or 2D. For BA or 2B, we supply cold-rolled versions under GB/T 3280.

Contact Gangsteel today for real-time pricing, stock availability, samples, or custom specifications of GB/T 4237 06Cr19Ni9NbN (347H) stainless steel hot-rolled coils, plates, and strips. Let us support your next high-temperature project with premium niobium-stabilized stainless steel solutions.