321 Stainless Steel (S32100) Coil

ステンレス鋼、オーステナイト系

チタン安定化クロム・ニッケル系オーステナイトステンレス鋼で、非常に優れた耐食性を持つ。.

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 タイプ304 for its increased resistance to creep and rupture. Both metals may be susceptible to stress corrosion cracking.

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レンジ

Bar Products	インペリアルサイズ	メートルサイズ
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"	-

シートサイズ	Finish	厚さ
2500 x 1250	2B	1.5mm - 3.0mm

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321 Stainless Steel Related Specifications

システム / スタンダード	国・地域	グレード / 役職
AISI	アメリカ	321
国連	インターナショナル	S32100
EN / W.Nr.	ヨーロッパ	1.4541
EN名	ヨーロッパ	X6CrNiTi18-10
ASTM A240	アメリカ	321 (plate, sheet, strip)
ASTM A182	アメリカ	F321 (forgings, flanges)
ASTM A213	アメリカ	TP321 (boiler / HX tubes)
ASTM A312	アメリカ	TP321 (seamless pipe)
GB	中国	06Cr18Ni11Ti
日本工業規格	日本	SUS321
BS	英国	321S31
アフノール	フランス	Z6CNT18-10

プロパティ

化学組成

-                                        化学元素
+                                        %プレゼント
-                                        クロム（Cr）
+.00 - 19.00
-                                        ニッケル（Ni）
+.00 - 12.00
-                                        Molybdenum (Mo)
+.00 - 0.75
-                                        銅（Cu）
+.00 - 0.75
-                                        チタン（Ti）
+.00 - 0.70
-                                        カーボン（C）
+.00 - 0.08
-                                        マンガン (Mn)
+.00 - 2.00
-                                        ケイ素 (Si)
+.25 - 1.00
-                                        リン (P)
+.00 - 0.04
-                                        硫黄（S）
+.00 - 0.03
-                                        Nitrogen (N)
+.00 - 0.10

機械的特性

321 Stainless Steel Bar

-                                        機械的性質
+                                        価値
-.2% Proof Stress
+N/mm2
-                                        伸び A50 mm
+%
-                                        硬度 ブリネル
+max HB

321 Stainless Steel Sheet

ASTM A240

-                                        機械的性質
+                                        価値
-                                        プルーフ・ストレス
+Min MPa
-                                        引張強度
+Min MPa
-                                        伸び A50 mm
+Min %

一般的な物理的特性

-                                        物理的性質
+                                        価値
-                                        密度
+.09 g/cm³
-                                        融点
+-1427 °C
-                                        弾性係数
+GPa
-                                        電気抵抗率
+.074 x 10-6 Ω .m
-                                        熱伝導率
+.1 W/m.K

Applications of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel with excellent resistance to intergranular corrosion そして 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. High-Temperature Industrial Applications

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

2.化学・石油化学産業

Tanks, piping, and valves handling mildly corrosive chemicals
Equipment operating under oxidizing and high-temperature conditions
必要なコンポーネント 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

概要

321 stainless steel is widely used in high-temperature, chemical, aerospace, and industrial applications due to its excellent intergranular corrosion resistance and thermal stability. .その 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

優れた耐性 oxidation and corrosion in moderate to high-temperature environments.
Titanium addition prevents sensitization, 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).
こんな人に向いている continuous high-temperature service in oxidizing atmospheres.
Exhibits good creep and stress-rupture properties.

3.機械的特性

素晴らしい tensile strength, ductility, and toughness, even at elevated temperatures.
Work-hardens moderately during cold forming, allowing increased strength where required.
維持 dimensional stability in welded assemblies.

4.加工と成形性

可能 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

概要

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.

追加情報

溶接性

Weldability of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel with 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 熱影響を受けたゾーンで。.
Eliminates the need for post-weld solution annealing in most cases.
Ensures 耐食性 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

概要

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.

製作

Fabrication of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel with 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.成形

Cold Forming:
- こんな人に向いている 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. Machining

Moderate difficulty due to toughness and work-hardening tendency
Carbide tools preferred for high-speed operations
用途 coolants or lubricants to reduce heat and improve surface finish

4. Welding

Excellent weldability with TIG, MIG, SMAW, or resistance welding
Titanium prevents 粒界腐食 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
ホットワーキング 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

概要

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, に最適である。 industrial, chemical, aerospace, and high-temperature applications.

ホットワーキング

Hot Working of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel with 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. Recommended Hot Working Temperature

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

2. Suitable Hot Working Processes

Hot Rolling: 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. Advantages of Hot Working

Reduces work hardening compared to cold working
Enhances 延性と靭性
プロデュース uniform grain structure and mechanical properties
Allows fabrication of large or complex components

4. Post-Hot Working Treatments

Solution annealing may be applied to relieve residual stresses and restore ductility
Pickling or passivation 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

概要

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.

耐熱性

Heat Resistance of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel designed for high-temperature applications. The addition of titanium prevents chromium carbide precipitation, allowing the steel to maintain 耐食性と機械的強度 at elevated temperatures.

1. Continuous Service Temperature

Suitable for continuous service 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. Intermittent Exposure

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

Forms a 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. Applications Related to Heat Resistance

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

概要

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, に最適である。 industrial, chemical, and aerospace environments.

加工性

Machinability of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel that exhibits 適度な加工性. 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.推奨工具

Carbide tools 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.
用途 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.
用途 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.

概要

321 stainless steel has 適度な加工性 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.

耐食性

Corrosion Resistance of 321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel with 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.

1.一般的な耐食性

耐性 oxidation and corrosion in atmospheric and mildly corrosive environments.
こんな人に向いている 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 sensitization 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

耐性 酸化とスケーリング at elevated temperatures (continuous service up to ~870°C, intermittent up to ~925°C).
で優れたパフォーマンスを発揮する。 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

概要

321 stainless steel offers excellent general and intergranular corrosion resistance, especially 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.

熱処理

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. Solution Annealing

目的
- 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)
Cooling: 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.ストレス解消

目的 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.制限事項

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

概要

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.

冷間加工

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 強度と硬度 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

Rolling: Sheets, strips, and plates
Drawing: Tubes, rods, and wires
Bending and Forming: 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.
耐性 粒界腐食 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

概要

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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商業用ステンレス合金

金属

ステンレス鋼

アルミニウム

銅

真鍮

アルミニウム・ブロンズ

銅ニッケル

リン青銅＆有鉛青銅

ニッケル合金

特殊鋼

チタン

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