GB/T 4237 06Cr18Ni9Cu3（302HQ）Stainless Steel Plate Suppli

06Cr18Ni9Cu3 Stainless Steel Coil & Plate | GB/T 4237 06Cr18Ni9Cu3（302HQ) Stainless Steel Sheet Manufacturer & Exporter – Gangsteel

Gangsteel is a specialized manufacturer and global exporter of GB/T 4237 06Cr18Ni9Cu3 stainless steel hot-rolled coils, plates, and wide heavy plates. Internationally recognized as Grade 302HQ (also known as 302HQ or XM-7), 06Cr18Ni9Cu3 is a copper-bearing austenitic stainless steel specifically engineered for superior cold-heading performance, excellent formability, and high resistance to galling and seizing during fastening operations.

With 17–19% Cr, 8–10% Ni, and 3–4% Cu, 302HQ provides significantly improved machinability, drawability, and thread-forming characteristics compared to standard 304 (06Cr19Ni10), making it the preferred material for high-volume production of cold-headed fasteners, screws, bolts, rivets, nuts, and self-tapping screws where severe cold deformation is required without cracking or excessive work hardening.

Produced under GB/T 4237-2015 (Stainless Steel Hot-Rolled Sheets and Strips), Gangsteel supplies 06Cr18Ni9Cu3 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 fastener manufacturing, automotive, electronics, construction hardware, and precision component industries.

Why Choose Gangsteel for 06Cr18Ni9Cu3 (302HQ) Hot-Rolled Stainless Steel?

Gangsteel’s wide heavy-plate rolling mills enable single-piece production of large-scale blanking stock and coil feedstock for high-speed cold-heading lines, reducing joints and improving material utilization in mass-production fastener plants. We maintain precise copper content and annealing cycles to ensure consistent low work-hardening rate and exceptional cold formability.

Chemical Composition of GB/T 4237 06Cr18Ni9Cu3

Standard Chemical Composition Table

Gangsteel controls copper at the higher end of the range to maximize cold-heading and thread-forming properties.

Mechanical Properties

Mechanical Properties Table (Annealed Condition)

302HQ exhibits lower work-hardening rate than 304/301, enabling severe cold heading without cracking.

Physical Properties

Physical Properties Table

Equivalent Materials Comparison Table

Key Insight: 06Cr18Ni9Cu3 (302HQ) provides dramatically better cold-heading performance and lower galling tendency than 304 due to copper addition.

Manufacturing Process: Hot Rolled at Gangsteel

Gangsteel's hot-rolling process for 06Cr18Ni9Cu3 includes:

1. Electric arc furnace + AOD refining → precise Cu/C low-carbon 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 06Cr18Ni9Cu3 (302HQ) Hot-Rolled Products

• Cold-headed fasteners (screws, bolts, nuts, rivets, self-tapping screws)
• Automotive trim clips, fasteners, and interior hardware
• Electronics and appliance fastening components
• Construction hardware and structural fasteners
• Precision cold-formed parts requiring high ductility
• Food service equipment fasteners (hygienic applications)

Advantages of Choosing 06Cr18Ni9Cu3 (302HQ)

• Exceptional cold-heading and thread-forming performance
• Significantly reduced galling and seizing during fastening
• Good general corrosion resistance in mild environments
• Excellent formability and low work-hardening rate
• Cost-effective alternative to 304 for high-volume fasteners
• Hygienic, easy-to-clean surface for food/pharma
• Wide global acceptance in fastener industry

Corrosion and Oxidation Resistance

Comparable to 304 in atmospheric, fresh water, and mild acid/organic environments. Copper addition slightly improves resistance to certain reducing acids. Oxidation resistance up to ~870°C intermittent.

Weldability and Fabrication

Good weldability with TIG/MIG/resistance/laser; low carbon minimizes sensitization. Use ER308/ER308L fillers. High ductility supports severe cold heading and forming.

Why Choose Gangsteel for GB/T 4237 06Cr18Ni9Cu3?

• 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 cold-heading, forming, and fastener applications

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 302HQ (06Cr18Ni9Cu3) over 304?

A: The 3–4% copper addition dramatically improves cold-heading performance, reduces galling, and enhances thread-forming ability, making it the preferred grade for high-volume fastener production where 304 would crack or seize.

Q2: Can 06Cr18Ni9Cu3 be used in chloride-containing or marine 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 302HQ?

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 06Cr18Ni9Cu3?

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

Q5: Is 302HQ weldable? What filler should be used?

A: Yes, good weldability. Use ER308 or ER308L fillers for matching properties.

Q6: Does Gangsteel offer third-party inspection for GB/T 4237 302HQ material?

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

Q7: What is the lead time for hot-rolled 06Cr18Ni9Cu3 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 302HQ 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 06Cr18Ni9Cu3 (302HQ) stainless steel hot-rolled coils, plates, and strips. Let us support your next high-volume fastener or cold-heading project with premium copper-enhanced stainless steel solutions.