When international buyers search for 201 stainless steel, many expect a global standard — like UNS S20100, listed under ASTM specifications. However, the 201 stainless steel widely used in China is not the same, and that causes confusion in global sourcing, quality control, and certification.

So, what exactly is “201 stainless steel” in China, and why is it different from the international version?

✅ 1. 201 Was Never a Fully Unified Standard

Unlike 304 or 316, which are clearly defined by ASTM and EN standards, 201 stainless steel originated as a low-nickel alternative, first developed in India. It uses higher manganese and nitrogen to replace expensive nickel.

China adopted the idea, but developed its own commercial variants to suit different application needs and price ranges.

✅ 2. China’s 201 Stainless Has Evolved Into “J-Series Grades”

In the Chinese market, 201 has been split into subgrades — commonly known as J1, J3, J4, J2, J5. These are not part of any international standard like ASTM A240 or UNS S20100.

Here’s a simplified comparison:

🔍 Main differences come from copper (Cu) and carbon (C). These affect corrosion resistance, surface finish quality, and mechanical strength. Other elements like Cr, Ni, Mn remain roughly in standard 201 ranges.

✅ 3. Not Recognized Under ASTM A240 or UNS S20100

While your technical datasheet might refer to UNS S20100 / ASTM A240 / ASTM A666, it’s important to know:

Chinese 201 (J1–J5) is not produced or certified under these standards.

So unless the mill specifically confirms strict compliance (which is rare), Chinese 201 cannot be considered fully ASTM-compliant — especially for regulated or structural applications.

✅ 4. What Certificates Are Available?

Though not ASTM-certified, most Chinese suppliers (including us) can provide:

• ✅ EN 10204 – 3.1 Mill Test Certificate (MTC)
• ✅ Full chemical composition and mechanical properties
• ✅ Heat / coil number traceability

This allows for internal QC and verification, and is acceptable for most commercial, decorative, and light industrial uses.

✅ 5. What Should You Do as a Buyer?

• Ask clearly whether the 201 offered is J1, J3, J4 or other grade
• Don’t assume compliance with UNS S20100 / ASTM A240 unless confirmed
• Request MTCs to verify composition and traceability
• Match the grade to your application (e.g. welding, bending, polishing, corrosion resistance)

📌 Final Thoughts

Chinese 201 stainless steel is not “fake”, but it is fundamentally different from international standards. Understanding this difference helps you make smarter sourcing decisions — and avoid costly misunderstandings.

If you’re unsure which grade fits your needs, we’re always happy to offer technical support and sample data.

Here are some sample MTC from Lisco (201 LH) and Baosteel (201 J1) :

• LISCO’s spec says >50% elongation, but in reality their 201 LH is usually just over 40%.

✅ What Is a No 4 Stainless Steel Finish?

The No 4 finish is a brushed, directional surface finish created by polishing stainless steel with abrasives in the 180–400 grit range. The result is a smooth yet non-reflective surface with a uniform grain that enhances both appearance and functionality.

It is often referred to as “No.4 brushed finish” or “4B finish”, and is widely recognized as a standard in industries that value hygiene and aesthetics in equal measure.

✅ Common Applications

At Art Steel Magic Co., Limited, we supply No 4 finished stainless steel coils and sheets to a wide range of industries. This finish is especially well-suited for:

• Commercial Kitchens
  Easy to clean, resistant to bacterial buildup, and compliant with food-grade hygiene requirements.
• Elevators and Public Interiors
  The brushed texture helps hide fingerprints and minor scratches, reducing maintenance in high-touch environments.
• Architectural Facades and Panels
  Designers and contractors choose No 4 for its subtle reflectivity and sleek appearance, making it ideal for both exterior and interior use.

✅ How No 4 Finish Is Produced

In our Foshan-based processing facility, the No 4 finish is achieved through a multi-step polishing process using precision abrasive equipment. Here is a simplified overview:

1. Surface Cleaning – Coils and sheets are cleaned to remove oils, scale, and contaminants before polishing.
2. Initial Abrasion – Coarse grit belts remove surface defects and ensure flatness.
3. Main Polishing – Abrasives in the 180–400 grit range create the uniform brushed grain.
4. Final Inspection – Every product is visually checked to ensure consistent texture and finish.

Our strict quality control ensures that every stainless steel sheet meets both technical and aesthetic expectations.

✅ Why Choose Art Steel Magic for No 4 Stainless Steel?

• Mill-direct sourcing ensures consistent material quality
• In-house polishing lines deliver reliable, uniform finishes
• Custom dimensions available on request
• Global export capability, including safe packaging and document support
• Trusted by buyers in 20+ countries, from Southeast Asia to South America

🗣️ “For us, No 4 finish is not just a texture — it’s a mark of quality control and precision. We believe in stainless steel that performs and impresses.”

✅ Explore More

At Art Steel Magic Co., Limited, we provide a full range of stainless steel solutions — from No 4 finishes to mirror polishing, HL, 2B, and custom surface processing.

Want to compare finishes or learn more about our in-house capabilities?
Browse our Product Categories or Service Overview to explore more technical insights and tailored supply options.