SS 321 Plate Suppliers

SS 321 plate is a heat-resistant austenitic stainless steel with titanium stabilization, offering excellent resistance to intergranular corrosion and oxidation at high temperatures. Its mechanical properties and chemical composition make it suitable for aerospace, échangeurs de chaleur, vaisseaux de pression, and petrochemical equipment. For projects involving high-temperature welded service, SS 321 remains a reliable stainless steel plate choice.

Description

SS 321 plate is a titanium-stabilized austenitic stainless steel plate designed for applications requiring excellent resistance to high temperatures and intergranular corrosion. It is widely used in industries such as aerospace, petrochemical processing, échangeurs de chaleur, and pressure vessels. Compared with standard 304 acier inoxydable, SS 321 offers improved stability at elevated temperatures because of its titanium addition.

Qu'est-ce que SS 321 Plaque?

SS 321 plate is an austenitic chromium-nickel stainless steel with titanium added as a stabilizing element. The titanium combines with carbon to prevent chromium carbide precipitation during welding or prolonged exposure to temperatures between 427°C and 816°C. Cela fait 321 stainless steel suitable for welded components operating in high-temperature environments.

The material has good formability, Excellente soudabilité, and strong oxidation resistance. It is commonly supplied in annealed plate form for fabrication and industrial processing.

Chemical Composition of SS 321 Plaque

The chemical composition of SS 321 plate provides excellent heat resistance and corrosion performance.

Élément	Contenu (%)
Carbone (C)	≤ 0.08
Chrome (Cr)	17.0 – 19.0
Nickel (Dans)	9.0 – 12.0
Manganèse (Mn)	≤ 2.00
Silicium (Et)	≤ 0.75
Phosphore (P.)	≤ 0.045
Soufre (S)	≤ 0.03
Titane (De)	5×C min – 0.70
Fer (Fe)	Équilibre

Titanium stabilization is the key feature that distinguishes SS 321 from 304 acier inoxydable.

Mechanical Properties of SS 321 Plaque

SS 321 plate combines good strength with excellent high-temperature stability.

Propriété	Valeur typique
Résistance à la traction	≥ 515 MPa
Limite d'élasticité	≥ 205 MPa
Élongation	≥ 40%
Dureté	≤ 217 HB
Densité	7.93 g/cm³
Melting Range	1398 – 1454°C

The material maintains good mechanical performance at both ambient and elevated temperatures.

Main Performance Characteristics

High Temperature Resistance

SS 321 plate is specifically developed for service in elevated temperature conditions. It performs well in continuous exposure up to approximately 870°C.

Résistance à la corrosion intergranulaire

The titanium content prevents carbide precipitation after welding, reducing the risk of intergranular corrosion in heat-affected zones.

Excellente soudabilité

SS 321 can be welded using standard stainless steel welding processes without requiring post-weld annealing in many applications.

Résistance à l'oxydation

The chromium-rich composition provides good oxidation resistance in high-temperature atmospheres.

Applications courantes du SS 321 Plaque

SS 321 stainless steel plate is commonly used in industrial sectors requiring heat resistance and long-term durability.

Aircraft exhaust systems
Composants de moteur à réaction
Échangeurs de chaleur
Boiler casings
Appareils à pression
Équipement de traitement chimique
Pièces de four
Joints de dilatation
Conduites à haute température
Petrochemical refinery equipment

The material is widely selected for fabricated components exposed to thermal cycling.

SS 321 Plaque vs 304 Acier inoxydable

Fonctionnalité	SS 321 Plaque	304 Acier inoxydable
Structure	Austénitique	Austénitique
Titanium Stabilized	Oui	Non
Résistance à la chaleur	Plus haut	Standard
Welded High-Temp Service	Excellent	Modéré
Résistance à la corrosion	Haut	Haut
Utilisation typique	High-temp equipment	Usage industriel général