Baja Tahan Karat, Austenitik

321 Stainless Steel (S32100) Coil

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

Jangkauan

Bar Products Ukuran Imperial Ukuran Metrik
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" -
Ukuran Lembar Finish Ketebalan
2500 x 1250 2B 1.5mm - 3.0mm

HARAP DICATAT

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321 Stainless Steel Related Specifications

Sistem / Standar Negara / Wilayah Kelas / Peruntukan
AISI AMERIKA SERIKAT 321
UNS Internasional S32100
EN / W.Nr. Eropa 1.4541
EN Nama Eropa X6CrNiTi18-10
ASTM A240 AMERIKA SERIKAT 321 (plate, sheet, strip)
ASTM A182 AMERIKA SERIKAT F321 (forgings, flanges)
ASTM A213 AMERIKA SERIKAT TP321 (boiler / HX tubes)
ASTM A312 AMERIKA SERIKAT TP321 (seamless pipe)
GB Cina 06Cr18Ni11Ti
JIS Jepang SUS321
BS INGGRIS 321S31
AFNOR Prancis Z6CNT18-10

Properti

Elemen Kimia % Hadir
Kromium (Cr) 17.00 - 19.00
Nikel (Ni) 9.00 - 12.00
Molibdenum (Mo) 0.00 - 0.75
Tembaga (Cu) 0.00 - 0.75
Titanium (Ti) 0.00 - 0.70
Karbon (C) 0.00 - 0.08
Mangan (Mn) 0.00 - 2.00
Silikon (Si) 0.25 - 1.00
Fosfor (P) 0.00 - 0.04
Belerang (S) 0.00 - 0.03
Nitrogen (N) 0.00 - 0.10

321 Stainless Steel Bar

Properti Mekanis Nilai
0,2% Tegangan Bukti 205 N/mm2
Perpanjangan A50 mm 40 %
Kekerasan Brinell 217 max HB

321 Stainless Steel Sheet

ASTM A240

Properti Mekanis Nilai
Stres Bukti 205 MPa
Kekuatan Tarik 515MPa
Perpanjangan A50 mm 35 Min %
Properti Fisik Nilai
Kepadatan 8.09 g/cm³
Titik Leleh 1400-1427 °C
Modulus Elastisitas 193 GPa
Tahanan Listrik 0.074 x 10-6 Ω .m
Konduktivitas Termal 16.1 W/m.K

Applications of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium dengan excellent resistance to intergranular corrosion dan 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. Industri Kimia dan Petrokimia

  • 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. Perbandingan dengan Grade Austenitik Lain

  • 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


Ringkasan

321 stainless steel is widely used in high-temperature, chemical, aerospace, and industrial applications due to its excellent intergranular corrosion resistance and thermal stability. Buah-buahannya stabilisasi titanium 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 baja tahan karat austenitik yang distabilkan titanium 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

  • Ketahanan yang sangat baik terhadap oxidation and corrosion in moderate to high-temperature environments.

  • Titanium addition prevents sensitisasi, 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).

  • Cocok untuk continuous high-temperature service in oxidizing atmospheres.

  • Exhibits good creep and stress-rupture properties.


3. Sifat Mekanik

  • Luar biasa tensile strength, ductility, and toughness, even at elevated temperatures.

  • Work-hardens moderately during cold forming, allowing increased strength where required.

  • Memelihara dimensional stability in welded assemblies.


4. Fabrication and Formability

  • Bisa 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


Ringkasan

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.

Informasi Tambahan

Weldability of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium dengan kemampuan las yang sangat baik, thanks to its low carbon content and titanium addition. The titanium prevents presipitasi kromium karbida, 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 di zona yang terkena panas.

  • Eliminates the need for post-weld solution annealing in most cases.

  • Ensures ketahanan korosi 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

  • Baja tahan karat austenitik memiliki ekspansi termal tinggi, 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

  • Peralatan kimia dan petrokimia

  • High-temperature furnace components

  • Marine and coastal equipment

  • Aerospace and automotive exhaust systems

  • Food and pharmaceutical processing equipment


Ringkasan

321 stainless steel provides kemampuan las yang sangat baik 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.

Fabrication of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium dengan 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. Pembentukan

  • Cold Forming:

    • Cocok untuk bending, rolling, drawing, and stamping

    • Work-hardens moderately; intermediate anil larutan 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. Memotong dan Menggunting

  • Can be cut using laser, waterjet, plasma, or mechanical methods.

  • Sharp tools and correct feeds minimize surface work hardening.


3. Pengerjaan Mesin

  • Moderate difficulty due to toughness and work-hardening tendency

  • Perkakas karbida preferred for high-speed operations

  • Gunakan coolants or lubricants to reduce heat and improve surface finish


4. Pengelasan

  • Excellent weldability with TIG, MIG, SMAW, or resistance welding

  • Titanium prevents korosi antar butir in welded areas

  • Filler material: ER321 recommended for matching composition and corrosion resistance

  • Post-weld heat treatment is generally tidak diperlukan


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


Ringkasan

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.

Hot Working of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium dengan 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. Suhu Pengerjaan Panas yang Direkomendasikan

  • Typical range: 1010–1175°C (1850–2150°F)

  • Exceeding this range may cause pertumbuhan butir, reducing toughness.

  • Working below this range increases flow stress, raising the risk of cracking.


2. Suitable Hot Working Processes

  • Pengguliran Panas: 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. Keunggulan Pengerjaan Panas

  • Mengurangi pengerasan kerja compared to cold working

  • Enhances ketangguhan dan keuletan

  • Menghasilkan 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 atau pasivasi enhances surface corrosion resistance after hot working


5. Applications Leveraging Hot Working

  • Komponen mesin industri

  • High-temperature chemical process equipment

  • Furnace and boiler components

  • Structural parts requiring elevated-temperature shaping


Ringkasan

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.

Heat Resistance of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium dirancang untuk high-temperature applications. The addition of titanium prevents presipitasi kromium karbida, allowing the steel to maintain corrosion resistance and mechanical strength pada suhu tinggi.


1. Suhu Layanan Berkelanjutan

  • Cocok untuk layanan berkelanjutan dalam atmosfer pengoksidasi hingga ~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. Paparan Intermiten

  • Dapat ditoleransi intermittent heating up to ~925°C (1700°F) without significant surface degradation

  • Suitable for parts exposed to occasional thermal cycles


3. Ketahanan Oksidasi

  • Membentuk lapisan kromium oksida pelindung in oxidizing atmospheres

  • Maintains corrosion resistance under moderate high-temperature conditions

  • Not recommended for strongly oxidizing or sulfidizing environments at very high temperatures


4. Efek Termal pada Sifat Mekanik

  • 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. Aplikasi yang Berkaitan dengan Ketahanan Panas

  • Furnace and boiler components

  • Heat exchangers, hot gas ducts, and superheaters

  • Chemical and petrochemical high-temperature equipment

  • Aerospace and automotive exhaust systems


6. Perbandingan dengan Grade Austenitik Lain

  • Heat resistance is slightly lower than 347 baja tahan karat but superior to 304 and 304L

  • Preferred when weldability and corrosion resistance are more critical than extreme high-temperature strength


Ringkasan

321 stainless steel provides kinerja suhu tinggi yang sangat baik, 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.

Machinability of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium that exhibits kemampuan mesin sedang. 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. Perilaku Pengerasan Regangan

  • 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. Rekomendasi Perkakas

  • Perkakas karbida 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. Kecepatan Potong dan Laju Pemakanan

  • 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. Pendinginan dan Pelumasan

  • Low thermal conductivity causes heat buildup at the cutting zone.

  • Gunakan flood coolant or cutting fluids to reduce heat, extend tool life, and improve surface finish.

  • High-pressure lubrication helps evacuate chips efficiently.


5. Pembentukan CIP

  • Chips are tough, stringy, and difficult to manage.

  • Gunakan chip breakers or special inserts to control chip flow during machining.


6. Permukaan Akhir

  • Achievable with sharp tools, proper feeds, and adequate cooling.

  • Work-hardened areas may require finishing passes to achieve desired surface quality.


Ringkasan

321 stainless steel has kemampuan mesin sedang 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.

Corrosion Resistance of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium dengan excellent resistance to intergranular corrosion and good general corrosion resistance. The addition of titanium prevents presipitasi kromium karbida, maintaining corrosion resistance in welded and high-temperature environments.


1. Ketahanan Korosi Umum

  • Resistant to oxidation and corrosion in atmospheric and mildly corrosive environments.

  • Cocok untuk industrial, chemical, and food-processing applications.

  • Maintains corrosion resistance even after welding or thermal exposure due to titanium stabilization.


2. Ketahanan Korosi Antar Butir

  • Titanium forms stable carbides, preventing chromium carbide formation along grain boundaries.

  • Reduces the risk of sensitisasi 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. Korosi Suhu Tinggi

  • Resistant to oxidation and scaling at elevated temperatures (continuous service up to ~870°C, intermittent up to ~925°C).

  • Berkinerja baik dalam oxidizing atmospheres and moderate chemical environments.

  • Tidak direkomendasikan untuk strongly oxidizing or sulfidizing environments at very high temperatures.


5. Applications Leveraging Corrosion Resistance

  • Furnace components, boilers, and heat exchangers

  • Peralatan kimia dan petrokimia

  • Aerospace and automotive exhaust systems

  • Food and pharmaceutical processing equipment

  • Welded industrial structures exposed to heat and atmospheric corrosion


Ringkasan

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

Heat Treatment of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium, 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

  • Tujuan:

    • Restore ductility after cold working or forming

    • Relieve residual stresses

    • Dissolve any undesired chromium carbides that may form in improper heating

  • Rentang Suhu: 1010–1120°C (1850–2050°F)

  • Pendinginan Rapid air or water quench to maintain fully austenitic structure

  • Efek:

    • Returns mechanical properties to the annealed condition

    • Preserves corrosion resistance due to titanium stabilization


2. Pengurangan Stres

  • Tujuan: Mengurangi tegangan sisa dari pembentukan, pembengkokan, atau pengelasan

  • Rentang Suhu: 450–650°C (840–1200°F)

  • Efek: Minimizes distortion and reduces risk of stress corrosion cracking without significantly altering mechanical properties


3. Pertimbangan Kondisi Kerja Dingin

  • Cold working increases strength but decreases ductility

  • Intermediate solution annealing may be applied to restore formability for further fabrication steps


4. Perlakuan Panas Pasca-Las

  • Umumnya tidak diperlukan due to titanium stabilization and low carbon content

  • Stress relief annealing may be applied for dimension-sensitive or high-temperature welded assemblies


5. Keterbatasan

  • Perlakuan panas dapat tidak meningkatkan kekerasan secara signifikan

  • Prolonged exposure above ~500°C may reduce cold work strengthening effects slightly


Ringkasan

Heat treatment of 321 stainless steel is mainly for penghilang stres, pemulihan daktilitas, dan pemeliharaan ketahanan korosi. Solution annealing and stress relief ensure optimal mechanical and chemical performance, making 321 ideal for welded, cold-worked, and high-temperature applications.

Cold Working of 321 Stainless Steel

321 stainless steel is a baja tahan karat austenitik yang distabilkan titanium that exhibits excellent cold-working properties. Cold working increases kekuatan dan kekerasan through work hardening while maintaining good corrosion resistance and ductility.


1. Perilaku Pengerasan Regangan

  • 321 stainless steel work-hardens moderately selama deformasi dingin.

  • Strength and hardness increase, while ductility decreases as deformation progresses.

  • Excessive cold working may require anil larutan to restore formability.


2. Proses Kerja Dingin Umum

  • Menggulung: Sheets, strips, and plates

  • Menggambar Tubes, rods, and wires

  • Membungkuk dan Membentuk Structural components, brackets, and clips

  • Pengecapan dan Penarikan Dalam Industrial and food-processing parts


3. Kontrol Sifat Mekanik

  • Cold working allows adjustment of kekuatan tarik, kekuatan luluh, dan kekerasan.

  • Extensive cold work may require anil larutan to restore ductility for further fabrication.


4. Pengaruh terhadap Ketahanan Korosi

  • Stabilisasi titanium mencegah presipitasi kromium karbida, maintaining corrosion resistance after cold work.

  • Resistant to korosi antar butir in welded or heavily worked areas.


5. Pertimbangan Pasca-Pembentukan

  • Solution annealing can relieve stresses and restore ductility if multiple cold-working steps are planned.

  • Cold working may slightly induce kemagnetan 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


Ringkasan

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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