321 Stainless Steel (S32100) Coil

Rostfreier Stahl, austenitisch

A titanium-stabilised chromium-nickel austenitic stainless steel with very good corrosion resistance.

Stainless steel 321 is the stabilized version of stainless steel 304. The 18/8 blend of chromium and nickel is tempered with titanium to give type 321 protection from intergranular corrosion that can occur after heat treatment. It is protected from temperatures ranging from 800 to 1500° F. The metal displays high strength and resistance to various forms of corrosions, including that from aqueous environments.

Type 321 finds application in heavy welding components, along with dynamic environments that are subject to changes.

However, the addition of titanium limits the application of 321 in terms of working. The metal is not recommended for certain welding techniques as it is not consumable. Beyond this, stainless steel 321 has excellent forming characteristics, does not require annealing after being welded, and displays toughness in a range of temperatures.

The metal shows strength even when exposed to cryogenic temperatures. Additionally, it is often chosen over Typ 304 for its increased resistance to creep and rupture. Both metals may be susceptible to stress corrosion cracking.

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Bereich

Bar Products	Kaiserliche Größen	Metrische Größen
Round Bar Bright Drawn H9	1⁄8" - 7⁄8"	4mm - 25mm
Round Bar Smooth Turned H9/H10	1" - 3"	30mm
Round Bar Peeled K12/K16	3 1⁄4" - 6"	-

Sheet Size	Finish	Thicknesses
2500 x 1250	2B	1.5mm - 3.0mm

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321 Stainless Steel Related Specifications

System / Standard	Land / Region	Besoldungsgruppe/Bezeichnung
AISI	USA	321
UNS	International	S32100
DE / W.Nr.	Europa	1.4541
DE Name	Europa	X6CrNiTi18-10
ASTM A240	USA	321 (plate, sheet, strip)
ASTM A182	USA	F321 (forgings, flanges)
ASTM A213	USA	TP321 (boiler / HX tubes)
ASTM A312	USA	TP321 (seamless pipe)
GB	China	06Cr18Ni11Ti
JIS	Japan	SUS321
BS	UK	321S31
AFNOR	Frankreich	Z6CNT18-10

Eigenschaften

Chemische Zusammensetzung

-                                        Chemisches Element
+                                        % Geschenk
-                                        Chrom (Cr)
+.00 - 19.00
-                                        Nickel (Ni)
+.00 - 12.00
-                                        Molybdenum (Mo)
+.00 - 0.75
-                                        Kupfer (Cu)
+.00 - 0.75
-                                        Titan (Ti)
+.00 - 0.70
-                                        Kohlenstoff (C)
+.00 - 0.08
-                                        Mangan (Mn)
+.00 - 2.00
-                                        Silizium (Si)
+.25 - 1.00
-                                        Phosphor (P)
+.00 - 0.04
-                                        Schwefel (S)
+.00 - 0.03
-                                        Nitrogen (N)
+.00 - 0.10

Mechanische Eigenschaften

321 Stainless Steel Bar

-                                        Mechanische Eigenschaften
+                                        Wert
-.2% Proof Stress
+N/mm2
-                                        Dehnung A50 mm
+%
-                                        Härte Brinell
+max HB

321 Stainless Steel Sheet

ASTM A240

-                                        Mechanische Eigenschaften
+                                        Wert
-                                        Nachweis von Stress
+Min MPa
-                                        Zugfestigkeit
+Min MPa
-                                        Dehnung A50 mm
+Min %

Allgemeine physikalische Eigenschaften

-                                        Physikalische Eigenschaft
+                                        Wert
-                                        Dichte
+.09 g/cm³
-                                        Schmelzpunkt
+-1427 °C
-                                        Elastizitätsmodul
+GPa
-                                        Elektrischer spezifischer Widerstand
+.074 x 10-6 Ω .m
-                                        Wärmeleitfähigkeit
+.1 W/m.K

Applications of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel mit excellent resistance to intergranular corrosion und good high-temperature strength. Its stability in welded and heat-affected areas makes it suitable for a wide range of industrial and high-temperature applications.

1. Industrielle Anwendungen im Hochtemperaturbereich

Furnace parts, heat exchangers, and chimneys
Boiler components, hot gas ducts, and superheaters
Components exposed to temperatures up to ~900°C (1650°F)

2. Chemical and Petrochemical Industry

Tanks, piping, and valves handling mildly corrosive chemicals
Equipment operating under oxidizing and high-temperature conditions
Components requiring welded assemblies with intergranular corrosion resistance

3. Aerospace and Automotive Applications

Exhaust systems and turbocharger components
High-temperature automotive components exposed to oxidizing environments

4. Food and Pharmaceutical Processing

Equipment requiring resistance to corrosion during cleaning and sterilization
Processing vessels exposed to hot and corrosive environments

5. Architectural and Structural Applications

Structures exposed to moderately high temperatures and polluted atmospheres
Cladding, panels, and piping in industrial buildings

6. Comparison to Other Austenitic Grades

More heat-resistant than 304/304L
Offers better weldability and resistance to intergranular corrosion than standard 304 in high-temperature applications
Titanium addition prevents sensitization in welded areas

Zusammenfassung

321 stainless steel is widely used in high-temperature, chemical, aerospace, and industrial applications due to its excellent intergranular corrosion resistance and thermal stability. Seine titanium stabilization makes it particularly suitable for welded components that require durability under heat and corrosive conditions.

Characteristics of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel designed to resist intergranular corrosion and maintain high strength at elevated temperatures. The addition of titanium stabilizes the material, preventing chromium carbide precipitation during welding or high-temperature service.

1. Corrosion Resistance

Excellent resistance to oxidation and corrosion in moderate to high-temperature environments.
Titanium addition prevents Sensibilisierung, maintaining corrosion resistance in welded areas.
Suitable for environments with oxidizing chemicals and atmospheric exposure.

2. High-Temperature Performance

Retains mechanical strength at temperatures up to ~900°C (1650°F).
Suitable for continuous high-temperature service in oxidizing atmospheres.
Exhibits good creep and stress-rupture properties.

3. Mechanical Properties

Ausgezeichnet tensile strength, ductility, and toughness, even at elevated temperatures.
Work-hardens moderately during cold forming, allowing increased strength where required.
Unterhält dimensional stability in welded assemblies.

4. Fabrication and Formability

Can be cold-worked (rolling, bending, deep drawing) and hot-worked (forging, extrusion, hot rolling) efficiently.
Titanium stabilization ensures welded structures maintain corrosion resistance without post-weld heat treatment.
Low risk of intergranular corrosion in welded or heat-affected zones.

5. Weldability

Excellent weldability with TIG, MIG, and resistance welding.
Titanium prevents carbide formation during welding, eliminating the need for post-weld solution annealing in most cases.

6. Applications Leveraging Characteristics

High-temperature furnace components, heat exchangers, and boilers
Chemical processing equipment and piping
Aerospace and automotive exhaust systems
Food and pharmaceutical processing equipment
Architectural structures exposed to heat and industrial atmospheres

Zusammenfassung

321 stainless steel is distinguished by excellent corrosion resistance, high-temperature strength, titanium stabilization, and good weldability. Its properties make it ideal for industrial, chemical, aerospace, and high-temperature applications, particularly where welded assemblies require durability and resistance to intergranular corrosion.

Zusätzliche Informationen

Schweißeignung

Weldability of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel mit excellent weldability, thanks to its low carbon content and titanium addition. The titanium prevents chromium carbide precipitation, reducing the risk of intergranular corrosion in welded areas.

1. Suitable Welding Processes

TIG (GTAW): Ideal for precise and thin-section welds
MIG (GMAW): Efficient for thicker sections and industrial applications
SMAW (Shielded Metal Arc Welding): Suitable for field welding and maintenance
Resistance Welding: Spot and seam welding for sheet metal applications

2. Low Carbon and Titanium Benefits

Titanium stabilizes the steel, preventing chromium carbide formation in the heat-affected zone.
Eliminates the need for post-weld solution annealing in most cases.
Ensures corrosion resistance is maintained in welded and heat-affected areas.

3. Filler Material Recommendations

Use matching titanium-stabilized fillers, such as ER321, for maintaining corrosion resistance and mechanical properties.
For dissimilar welds with austenitic stainless steel, ensure compatible filler material is selected to prevent sensitization.

4. Heat Input and Distortion Control

Austenitic stainless steels have high thermal expansion, which can lead to distortion.
Moderate heat input and proper sequencing minimize warping.
Intermittent tack welding can help maintain dimensional accuracy.

5. Applications Leveraging Weldability

Chemical and petrochemical equipment
High-temperature furnace components
Marine and coastal equipment
Aerospace and automotive exhaust systems
Food and pharmaceutical processing equipment

Zusammenfassung

321 stainless steel provides excellent weldability due to titanium stabilization and low carbon content. Welded joints maintain high corrosion resistance and structural integrity, making 321 ideal for industrial, chemical, high-temperature, marine, and food-processing applications.

Fabrikation

Fabrication of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel mit excellent corrosion resistance and high-temperature stability. Its low carbon content and titanium addition allow for versatile fabrication using conventional metalworking processes, while maintaining mechanical properties and corrosion resistance.

1. Bildung von

Cold Forming:
- Suitable for bending, rolling, drawing, and stamping
- Work-hardens moderately; intermediate solution annealing may be required for extensive deformation
Hot Forming:
- Recommended for complex or thick sections at 1010–1175°C (1850–2150°F)
- Ensures uniform mechanical properties and reduces work-hardening

2. Cutting and Shearing

Can be cut using laser, waterjet, plasma, or mechanical methods.
Sharp tools and correct feeds minimize surface work hardening.

3. Bearbeitung

Moderate difficulty due to toughness and work-hardening tendency
Hartmetall-Werkzeuge preferred for high-speed operations
Verwenden Sie coolants or lubricants to reduce heat and improve surface finish

4. Welding

Excellent weldability with TIG, MIG, SMAW, or resistance welding
Titanium prevents interkristalline Korrosion in welded areas
Filler material: ER321 recommended for matching composition and corrosion resistance
Post-weld heat treatment is generally not required

5. Cold and Hot Working

Cold working increases strength through work hardening; solution annealing may be needed to restore ductility
Hot working produces uniform properties and is recommended for thick or complex components

6. Surface Finishing

Available in 2B (mill finish), BA (bright annealed), and polished surfaces
Cold working may require additional polishing or pickling for aesthetic or corrosion-sensitive applications

7. Applications Leveraging Fabrication

Chemical and petrochemical vessels and piping
High-temperature furnace and boiler components
Aerospace and automotive exhaust systems
Food and pharmaceutical processing equipment
Architectural structures exposed to heat or industrial atmospheres

Zusammenfassung

321 stainless steel is highly versatile and easy to fabricate, offering excellent cold and hot formability, machining, and welding properties. Titanium stabilization ensures corrosion resistance is maintained throughout fabrication, making it ideal for industrial, chemical, aerospace, and high-temperature applications.

Heißarbeit

Hot Working of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel mit excellent hot workability, making it suitable for forging, rolling, extrusion, and forming at elevated temperatures. Hot working reduces work hardening and ensures uniform mechanical properties while preserving corrosion resistance.

1. Empfohlene Warmarbeitstemperatur

Typical range: 1010–1175°C (1850–2150°F)
Exceeding this range may cause Kornwachstum, reducing toughness.
Working below this range increases flow stress, raising the risk of cracking.

2. Suitable Hot Working Processes

Warmwalzen: Sheets, plates, and structural components
Hot Forging: High-strength or complex-shaped parts
Hot Extrusion: Rods, tubes, and profiles
Hot Pressing/Forming: Thick or large components difficult to cold-work

3. Vorteile der Warmumformung

Reduziert Kaltverfestigung compared to cold working
Verbessert Duktilität und Zähigkeit
Erzeugt uniform grain structure and mechanical properties
Allows fabrication of large or complex components

4. Behandlungen nach der Warmarbeit

Lösungsglühen may be applied to relieve residual stresses and restore ductility
Beizen oder Passivieren enhances surface corrosion resistance after hot working

5. Applications Leveraging Hot Working

Industrial machinery components
High-temperature chemical process equipment
Furnace and boiler components
Structural parts requiring elevated-temperature shaping

Zusammenfassung

321 stainless steel demonstrates excellent hot workability, allowing it to be forged, rolled, or formed at 1010–1175°C. Hot working improves ductility, reduces work hardening, and ensures uniform mechanical properties while preserving corrosion resistance, making it ideal for industrial, chemical, high-temperature, and structural applications.

Hitzebeständigkeit

Heat Resistance of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel konzipiert für Hochtemperaturanwendungen. The addition of titanium prevents chromium carbide precipitation, allowing the steel to maintain corrosion resistance and mechanical strength bei erhöhter Temperatur.

1. Kontinuierliche Betriebstemperatur

Geeignet für den Dauereinsatz in oxidizing atmospheres up to ~870°C (1600°F)
Maintains mechanical properties and corrosion resistance in this range
Prolonged exposure above 870°C may cause slight scaling and reduction in toughness

2. Intermittierende Exposition

Can tolerate intermittent heating up to ~925°C (1700°F) without significant surface degradation
Suitable for parts exposed to occasional thermal cycles

3. Oxidation Resistance

Bildet eine protective chromium oxide layer in oxidizing atmospheres
Maintains corrosion resistance under moderate high-temperature conditions
Not recommended for strongly oxidizing or sulfidizing environments at very high temperatures

4. Thermal Effects on Mechanical Properties

Retains tensile strength and ductility at moderate high temperatures
Cold-worked areas may lose some work-hardening benefits after prolonged heat exposure
Grain growth may occur if exposed to excessive heat without solution annealing

5. Anwendungen im Zusammenhang mit der Hitzebeständigkeit

Furnace and boiler components
Heat exchangers, hot gas ducts, and superheaters
Chemical and petrochemical high-temperature equipment
Aerospace and automotive exhaust systems

6. Comparison to Other Austenitic Grades

Heat resistance is slightly lower than 347 stainless steel but superior to 304 and 304L
Preferred when weldability and corrosion resistance are more critical than extreme high-temperature strength

Zusammenfassung

321 stainless steel provides excellent high-temperature performance, with continuous service up to ~870°C and intermittent exposure up to ~925°C. Titanium stabilization prevents sensitization, maintaining corrosion resistance and mechanical properties in welded and high-temperature applications, making it ideal for industrial, chemical, and aerospace environments.

Bearbeitbarkeit

Machinability of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel that exhibits mäßige Bearbeitbarkeit. Its toughness, work-hardening tendency, and low thermal conductivity require special attention to tooling, cutting parameters, and lubrication during machining to achieve high-quality surfaces and efficient production.

1. Work-Hardening Behavior

321 stainless steel work-hardens quickly during cutting.
Hardened surfaces increase cutting forces and accelerate tool wear.
Continuous, smooth cutting is recommended to minimize localized work hardening.

2. Empfehlungen für die Werkzeugausstattung

Hartmetall-Werkzeuge are preferred for high-speed or heavy-duty machining.
High-speed steel (HSS) tools can be used at lower speeds for light to medium operations.
Tools with positive rake angles reduce cutting forces and improve surface finish.

3. Cutting Speeds and Feeds

Slower cutting speeds than carbon steels are recommended.
Moderate to heavy feeds ensure continuous chip flow and prevent local work hardening.
Avoid dwelling or stopping on the workpiece to prevent hard spots.

4. Cooling and Lubrication

Low thermal conductivity causes heat buildup at the cutting zone.
Verwenden Sie flood coolant or cutting fluids to reduce heat, extend tool life, and improve surface finish.
High-pressure lubrication helps evacuate chips efficiently.

5. Chip Formation

Chips are tough, stringy, and difficult to manage.
Verwenden Sie chip breakers or special inserts to control chip flow during machining.

6. Surface Finish

Achievable with sharp tools, proper feeds, and adequate cooling.
Work-hardened areas may require finishing passes to achieve desired surface quality.

Zusammenfassung

321 stainless steel has mäßige Bearbeitbarkeit and requires careful tool selection, cutting parameters, and lubrication. When properly managed, high-quality surfaces and dimensional accuracy are achievable, making it suitable for chemical, aerospace, automotive, and high-temperature industrial applications.

Korrosionsbeständigkeit

Corrosion Resistance of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel mit excellent resistance to intergranular corrosion and good general corrosion resistance. The addition of titanium prevents chromium carbide precipitation, maintaining corrosion resistance in welded and high-temperature environments.

1. Allgemeine Korrosionsbeständigkeit

Resistant to oxidation and corrosion in atmospheric and mildly corrosive environments.
Suitable for industrial, chemical, and food-processing applications.
Maintains corrosion resistance even after welding or thermal exposure due to titanium stabilization.

2. Intergranular Corrosion Resistance

Titanium forms stable carbides, preventing chromium carbide formation along grain boundaries.
Reduces the risk of Sensibilisierung during welding or high-temperature service.
Ideal for welded assemblies without requiring post-weld heat treatment.

3. Chloride and Pitting Resistance

Provides moderate resistance to chloride-induced pitting compared with 304 stainless steel.
Less resistant than 316 or 317 grades but sufficient for most industrial and chemical applications.

4. High-Temperature Corrosion

Resistant to Oxidation und Verzunderung at elevated temperatures (continuous service up to ~870°C, intermittent up to ~925°C).
Gut geeignet für oxidizing atmospheres and moderate chemical environments.
Not recommended for strongly oxidizing or sulfidizing environments at very high temperatures.

5. Applications Leveraging Corrosion Resistance

Furnace components, boilers, and heat exchangers
Chemical and petrochemical equipment
Aerospace and automotive exhaust systems
Food and pharmaceutical processing equipment
Welded industrial structures exposed to heat and atmospheric corrosion

Zusammenfassung

321 stainless steel offers excellent general and intergranular corrosion resistance, besonders in welded or high-temperature applications. Titanium stabilization ensures durability in chemical, industrial, aerospace, and high-temperature environments, making it a reliable choice where corrosion resistance is critical.

Wärmebehandlung

Heat Treatment of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel, which is not hardened by heat treatment. Heat treatment is primarily used to relieve stresses, restore ductility, and maintain corrosion resistance, rather than to increase hardness.

1. Lösungsglühen

Zweck:
- Restore ductility after cold working or forming
- Relieve residual stresses
- Dissolve any undesired chromium carbides that may form in improper heating
Temperature Range: 1010–1120°C (1850–2050°F)
Kühlung: Rapid air or water quench to maintain fully austenitic structure
Effect:
- Returns mechanical properties to the annealed condition
- Preserves corrosion resistance due to titanium stabilization

2. Stressabbau

Zweck: Reduce residual stresses from forming, bending, or welding
Temperature Range: 450-650°C (840-1200°F)
Effect: Minimizes distortion and reduces risk of stress corrosion cracking without significantly altering mechanical properties

3. Cold-Worked Condition Considerations

Cold working increases strength but decreases ductility
Intermediate solution annealing may be applied to restore formability for further fabrication steps

4. Post-Weld Heat Treatment

Generally not required due to titanium stabilization and low carbon content
Stress relief annealing may be applied for dimension-sensitive or high-temperature welded assemblies

5. Limitations

Heat treatment does not significantly increase hardness
Prolonged exposure above ~500°C may reduce cold work strengthening effects slightly

Zusammenfassung

Heat treatment of 321 stainless steel is mainly for stress relief, ductility restoration, and maintaining corrosion resistance. Solution annealing and stress relief ensure optimal mechanical and chemical performance, making 321 ideal for welded, cold-worked, and high-temperature applications.

Kaltbearbeitung

Cold Working of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel that exhibits excellent cold-working properties. Cold working increases strength and hardness through work hardening while maintaining good corrosion resistance and ductility.

1. Work-Hardening Behavior

321 stainless steel work-hardens moderately during cold deformation.
Strength and hardness increase, while ductility decreases as deformation progresses.
Excessive cold working may require solution annealing to restore formability.

2. Common Cold Working Processes

Rollend: Sheets, strips, and plates
Drawing: Tubes, rods, and wires
Biegen und Umformen: Structural components, brackets, and clips
Stamping and Deep Drawing: Industrial and food-processing parts

3. Mechanical Properties Control

Cold working allows adjustment of tensile strength, yield strength, and hardness.
Extensive cold work may require solution annealing to restore ductility for further fabrication.

4. Effect on Corrosion Resistance

Titanium stabilization prevents chromium carbide precipitation, maintaining corrosion resistance after cold work.
Resistant to interkristalline Korrosion in welded or heavily worked areas.

5. Post-Forming Considerations

Solution annealing can relieve stresses and restore ductility if multiple cold-working steps are planned.
Cold working may slightly induce magnetism due to minor martensitic transformation, typically negligible.

6. Applications Leveraging Cold Work

Springs, clips, and fasteners
Structural components requiring higher strength
Tubes, rods, and wires for chemical and food-processing equipment
Formed components requiring corrosion resistance and strength

Zusammenfassung

321 stainless steel exhibits excellent cold-working characteristics, allowing increased strength through work hardening while preserving corrosion resistance. Proper management of deformation and intermediate annealing ensures high-quality, durable components for industrial, chemical, food-processing, marine, and structural applications.

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