How to classify stainless steel

Release time:

2025-06-17

Chromium stainless steel: mainly refers to ferritic and martensitic stainless steel, which mainly relies on chromium (>10.5%) to form a passivation film for rust prevention. Chromium-nickel stainless steel: mainly refers to austenitic stainless steel (such as 304, 316), and the combination of chromium and nickel provides excellent corrosion resistance and formability.

Chromium stainless steels: Primarily ferritic and martensitic stainless steels, relying mainly on chromium (>10.5%) to form a passivation film for rust prevention.
Chromium-nickel stainless steels: Primarily austenitic stainless steels (such as 304, 316), where the chromium-nickel combination provides excellent corrosion resistance and formability.
Chromium-nickel-molybdenum stainless steels: Molybdenum is added to the chromium-nickel base, significantly improving resistance to pitting and crevice corrosion (such as 316, 317, duplex stainless steels 2205/2507).
Chromium-manganese (chromium-manganese-nickel-nitrogen) stainless steels: Austenitic steels where manganese and nitrogen partially or fully replace nickel (such as 200 series: 201, 202).
Ultra-pure ferritic stainless steels: Ferritic steels with extremely low carbon and nitrogen content (such as C+N ≤ 150-200ppm) achieved through advanced metallurgical techniques (VOD, AOD, etc.) (such as 439, 444), resulting in significantly improved corrosion resistance and weldability.

Nickel iron prices stabilize, but cannot hide the weakness of the stainless steel market:青山's production reduction triggers industry adjustments, and the oversupply situation is difficult to change in the short term

What is the current market trend for 304L stainless steel seamless pipes?

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