201 (1.4372 family) is a nickel-saving austenitic grade that substitutes manganese (Mn) and nitrogen (N) for part of the nickel, making it clearly cheaper than 304.

Key differences:

• Corrosion: chromium is close to 304, but lower nickel and higher manganese mean a higher risk of pitting and rust in wet or chloride-containing environments. • Magnetism: 201 develops noticeable magnetism more readily after cold working. • Forming: 201 work-hardens faster and cracks more easily in deep drawing or repeated bending. • Welding: higher risk of hot cracking and loss of corrosion resistance than 304.

Where it can be used:

1) Dry indoor, low-corrosion and appearance parts: 201 can reduce cost. 2) Kitchenware in contact with water, coastal or outdoor use, food equipment: do not substitute 201 for 304. 3) Export orders with a specified grade: follow the drawing and contract strictly; do not substitute on your own.

Purchasing advice: require measured Cr/Ni/Mn on the mill certificate and confirm the service environment. Passing 201 off as 304 is a common risk and can be detected by chemical analysis.