Chemical Composition and Properties: What Sets 201 and 304 Apart?

Chromium Content

Rust resistance requires chromium. The composition of stainless steel 201 contains 4.5%-7.1% manganese at a chromium content of 16.0%-18.0%. Chromium contents of grade 304 are from 18.0% to 20.0%. This translates to higher Chromium content, which in turn means better rust protection.

When exposed to chromium, steel will form a passive oxide layer. Chemistry plus moisture don't touch it. Grade 304 has a PREN greater than 19. Grade 201's is below 17. From the metrics we can see that 304 generally does better under harsh environments. The choice is then left to you, depending on your analytical needs. When deciding, check the formula details too.

 

Property	Stainless Steel 201	Stainless Steel 304
Chromium Content	16.0% – 18.0%	18.0% – 20.0%
Nickel Content	3.5% – 5.5%	8.0% – 10.5%
Manganese Content	5.5% – 7.5%	≤ 2.0%
Corrosion Resistance	Moderate; suitable for mild environments	High; suitable for harsh environments
Magnetic Properties	Slightly magnetic after cold working	Non-magnetic in annealed condition
Tensile Strength	Approximately 515 MPa	Approximately 505 MPa
Yield Strength	Approximately 275 MPa	Approximately 215 MPa

 

 

If you have project requirements for SUS201&SUS304 stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

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