GB/T 4237 12Cr18Mn9Ni5N（202）Stainless Steel Plate Supplie

12Cr18Mn9Ni5N Stainless Steel Coil & Plate | GB/T 4237 12Cr18Mn9Ni5N（202) Stainless Steel Sheet Manufacturer & Exporter – Gangsteel

Gangsteel is a leading manufacturer and international exporter of GB/T 4237 12Cr18Mn9Ni5N stainless steel hot-rolled coils, plates, and wide heavy plates. Known globally as Grade 202 (Chinese designation 202), this austenitic chromium-manganese-nickel stainless steel is an upgraded version of Grade 201, offering improved corrosion resistance, higher strength, and better formability due to higher manganese (7.5–10.0%) and slightly elevated nickel (4.0–6.0%). It serves as a cost-effective alternative to traditional SUS304 in applications requiring moderate corrosion resistance, good mechanical properties, and excellent deep-drawability at a significantly lower cost.

Produced under the GB/T 4237-2015 standard (Stainless Steel Hot-Rolled Sheets and Strips), Gangsteel supplies 12Cr18Mn9Ni5N in thicknesses from 2 mm to 500 mm and widths up to 4200 mm — among the widest hot-rolling capabilities available globally. Our products are supplied in standard hot-rolled finishes No.1 (annealed & pickled) and 2D (annealed & pickled dull), and are widely exported to kitchen appliance, architectural decoration, automotive trim, railway components, food processing equipment, and general fabrication markets worldwide.

This in-depth product guide covers everything you need to know about our GB/T 4237 12Cr18Mn9Ni5N (202) hot-rolled stainless steel — from chemical composition and mechanical properties to manufacturing process, equivalent materials comparison, applications, advantages, quality assurance, and frequently asked questions.

Introduction to 12Cr18Mn9Ni5N (202) Stainless Steel

12Cr18Mn9Ni5N, commonly called Grade 202, is an austenitic stainless steel designed to further reduce nickel dependency compared to Grade 201 while improving corrosion resistance and mechanical performance. By increasing manganese to 7.5–10.0% and nickel to 4.0–6.0%, it achieves better general corrosion resistance, higher yield strength in annealed condition, and improved toughness at low temperatures than 201. It remains non-magnetic when annealed but develops slight magnetism after cold working.

Compared to classic 304 (06Cr19Ni10), Grade 202 costs 25–45% less while offering comparable formability, weldability, and aesthetics after polishing — ideal for indoor, dry, or mildly corrosive environments where severe pitting or chloride exposure is not expected.

Gangsteel produces 12Cr18Mn9Ni5N exclusively via hot rolling, delivering heavy-gauge wide plates and coils that are perfect for subsequent cold rolling, slitting, cutting, forming, and welding in high-volume production.

Chemical Composition of GB/T 4237 12Cr18Mn9Ni5N

Chemical Composition Table

Gangsteel keeps values in the optimal mid-to-lower ranges for best weldability, formability, and cost efficiency.

Mechanical Properties

In annealed condition per GB/T 4237:

Mechanical Properties Table (Annealed)

Cold-rolled or work-hardened conditions can achieve tensile strengths >1000 MPa.

Physical Properties

Physical Properties Table

Equivalent Materials Comparison Table

Key Insight: 12Cr18Mn9Ni5N (202) offers noticeably better corrosion resistance and strength than 201 while remaining far more economical than 304/316.

Manufacturing Process: Hot Rolled at Gangsteel

Gangsteel's hot-rolling process for 12Cr18Mn9Ni5N includes:

1. Electric arc furnace + AOD refining for precise chemistry
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. 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.

Key Applications of 12Cr18Mn9Ni5N (202) Hot-Rolled Products

• Kitchen appliances (sinks, cookware, refrigerator panels)
• Architectural decoration (elevator interiors, handrails, wall panels)
• Automotive trim, railway car panels, trailer parts
• Food service equipment (indoor/moderate exposure)
• Conveyor belts, hose clamps, structural supports
• Hotel supplies, public facility fittings

Advantages of Choosing 12Cr18Mn9Ni5N (202)

• 25–45% lower cost than 304/316
• Better corrosion resistance and strength than 201
• Excellent formability and polishability
• Good weldability with standard austenitic fillers
• Adequate performance in indoor/dry conditions
• High recyclability and sustainability
• Wide availability in heavy gauge and wide width

Corrosion and Oxidation Resistance

Moderate resistance to atmospheric corrosion, mild acids, and organic environments; better than 201 but inferior to 304 in chlorides or strong acids. Oxidation resistance up to ~800°C intermittent.

Weldability and Fabrication

Good weldability using ER308/ER308L fillers; low carbon reduces sensitization risk. Excellent cold formability in annealed condition.

Why Choose Gangsteel for GB/T 4237 12Cr18Mn9Ni5N?

• 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 forming, welding, 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 Grade 202 (12Cr18Mn9Ni5N) and Grade 201?

A: Grade 202 has higher manganese (7.5–10.0%) and nickel (4.0–6.0%), providing better corrosion resistance, higher strength, and improved toughness than 201, while still remaining much cheaper than 304.

Q2: Can 12Cr18Mn9Ni5N be used for outdoor or coastal applications?

A: Not recommended for long-term exposure to chlorides (coastal air, road salt). Use 304, 316, or 444 for superior pitting resistance.

Q3: What finishes are available under GB/T 4237 for hot-rolled 202?

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

Q4: What is the maximum width and thickness Gangsteel can produce for 12Cr18Mn9Ni5N?

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

Q5: Is Grade 202 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 202 material?

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

Q7: What is the lead time for hot-rolled 12Cr18Mn9Ni5N 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 202 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 12Cr18Mn9Ni5N (202) stainless steel hot-rolled coils, plates, and strips. Let us support your next project with high-quality, cost-effective stainless steel solutions.