ALLOY STEEL PLATE NAS255: Application Fields and Detailed Analysis

NAS255 alloy steel plate, designed with a "high nickel + high chromium + high molybdenum + nitrogen" composition, excels in corrosion resistance, high-temperature strength, and processability, making it widely used in industries with rigorous material requirements. Below is a detailed description of its core application scenarios:

I. Chemical and Petrochemical Industries

Corrosive Medium Processing Equipment

Reactors and Distillation Columns: In the synthesis of chlorinated organics (e.g., vinyl chloride, chlorobenzene), NAS255 withstands erosion from hydrogen chloride (HCl) and chloride ions, preventing localized corrosion. For example, a chemical plant using NAS255 reactors in brine with Cl⁻ concentration up to 300,000 mg/L achieved an annual corrosion rate of only 0.0004 mm, extending service life 5× longer than 316L stainless steel.

Heat Exchangers and Pipeline Systems: In sulfuric acid production, NAS255's high chromium (20–22%) and molybdenum (6–7%) form a stable passive film, resisting dilute sulfuric acid (≤5%). Its thermal expansion coefficient (14×10⁻⁶ K⁻¹) is close to carbon steel, reducing thermal stress cracking risks.

Chlorine-Containing Process Equipment

Chlorinated Disinfectant Production: During sodium hypochlorite (NaClO) solution preparation, NAS255's pitting resistance (pitting potential Erp≈+0.2~+0.4V vs SCE) prevents localized corrosion from ClO⁻, extending equipment maintenance cycles from 1 to 5 years.

Flue Gas Desulfurization (FGD) Units: In wet FGD, slurry in absorption towers has Cl⁻ concentrations up to 100,000 mg/L. NAS255 linings have a stress corrosion cracking (SCC) threshold (≥400 mg/L Cl⁻), far exceeding 316L (≤100 mg/L), avoiding sudden cracking.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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