GB/T 4237 06Cr18Ni11Nb（347）Stainless Steel Plate Supplier

06Cr18Ni11Nb Stainless Steel Coil & Plate | GB/T 4237 06Cr18Ni11Nb（347) Stainless Steel Sheet Manufacturer & Exporter – Gangsteel

Gangsteel is a leading manufacturer and global exporter of GB/T 4237 06Cr18Ni11Nb stainless steel hot-rolled coils, plates, and wide heavy plates. Internationally recognized as Grade 347 — a classic niobium-stabilized austenitic stainless steel — 06Cr18Ni11Nb is specifically engineered to provide excellent resistance to intergranular corrosion after welding or prolonged exposure to temperatures in the 425–815°C (800–1500°F) sensitization range.

With 17–19% Cr, 9–13% Ni, and niobium stabilization (Nb ≥ 10 × C), 347 prevents chromium carbide precipitation at grain boundaries, maintaining full corrosion resistance in the heat-affected zone without the need for post-weld annealing in most applications. It offers general corrosion resistance comparable to 304 in atmospheric, mild chemical, and organic environments, combined with superior high-temperature oxidation resistance and creep strength up to 870°C intermittent.

Produced under GB/T 4237-2015 (Stainless Steel Hot-Rolled Sheets and Strips), Gangsteel supplies 06Cr18Ni11Nb 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, aerospace, heat exchanger, furnace, exhaust system, and high-temperature piping industries.

Why Choose Gangsteel for 06Cr18Ni11Nb (347) Hot-Rolled Stainless Steel?

Gangsteel’s wide heavy-plate rolling mills enable single-piece production of large heat exchanger tubesheets, furnace parts, exhaust manifolds, and welded piping spools, minimizing welds and improving long-term intergranular corrosion resistance. We maintain precise niobium-to-carbon ratio control and solution annealing to deliver consistent stabilization and high-temperature performance.

Chemical Composition of GB/T 4237 06Cr18Ni11Nb

Standard Chemical Composition Table

Gangsteel ensures the Nb/C ratio is well above 10:1 to fully bind carbon and provide maximum intergranular corrosion resistance.

Mechanical Properties

Mechanical Properties Table (Annealed Condition)

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

Physical Properties

Physical Properties Table

Equivalent Materials Comparison Table

Key Insight: 06Cr18Ni11Nb (347) provides excellent intergranular corrosion resistance at 425–815°C due to niobium stabilization, outperforming unstabilized 304 in welded high-temperature service.

Manufacturing Process: Hot Rolled at Gangsteel

Gangsteel's hot-rolling process for 06Cr18Ni11Nb includes:

1. Electric arc furnace + AOD refining → precise Nb/C ratio 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 06Cr18Ni11Nb (347) Hot-Rolled Products

• Aerospace exhaust manifolds, jet engine parts, and thrust reversers
• Automotive exhaust systems and high-temperature piping
• Heat exchanger tubes and furnace components
• Boiler superheater tubes and reheater supports
• Chemical processing equipment exposed to cyclic temperatures
• Food and pharmaceutical processing with welded high-temp lines

Advantages of Choosing 06Cr18Ni11Nb (347)

• Excellent resistance to intergranular corrosion at 425–815°C
• Superior high-temperature oxidation resistance up to 870°C intermittent
• Outstanding weldability without post-weld annealing in most cases
• Good creep strength and thermal fatigue resistance
• Comparable general corrosion resistance to 304 in mild environments
• Cost-effective stabilized grade for high-temperature welded service
• Wide global acceptance and recyclability

Corrosion and Oxidation Resistance

Forms stable Cr oxide layer; resists atmospheric, mild acids, and organics. Niobium stabilization eliminates intergranular corrosion risk in sensitized range. Oxidation resistance up to ~870°C intermittent.

Weldability and Fabrication

Excellent weldability with TIG/MIG/resistance/laser; niobium prevents sensitization. Use ER347 fillers. High ductility supports complex forming.

Why Choose Gangsteel for GB/T 4237 06Cr18Ni11Nb?

• 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, stabilization, 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 advantage of 347 (06Cr18Ni11Nb) over 304?

A: 347 is niobium-stabilized to prevent intergranular corrosion after welding or exposure to 425–815°C, making it suitable for high-temperature welded structures where 304 would be at risk of sensitization.

Q2: Can 06Cr18Ni11Nb be used in chloride-containing environments?

A: It has similar general corrosion resistance to 304 — moderate in mild chlorides — but not recommended for long-term marine or high-chloride service. Use 316L or 317L for better pitting resistance.

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

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 06Cr18Ni11Nb?

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

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

A: Yes, excellent weldability. Use ER347 fillers to match the niobium stabilization.

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

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

Q7: What is the lead time for hot-rolled 06Cr18Ni11Nb 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 347 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.

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Contact Gangsteel today for real-time pricing, stock availability, samples, or custom specifications of GB/T 4237 06Cr18Ni11Nb (347) stainless steel hot-rolled coils, plates, and strips. Let us support your next high-temperature welded project with premium niobium-stabilized stainless steel solutions.