AISI 347 Stainless Steel

Table of Contents

Overview

AISI 347 stainless steel is a versatile and high-performance material widely used in various industries for its excellent mechanical properties and resistance to corrosion. It is a columbium-stabilized austenitic stainless steel with a unique composition that enhances its performance in high-temperature environments.

AISI 347 stainless steel is often chosen for applications that require prolonged exposure to high temperatures because it offers superior resistance to intergranular corrosion. In this comprehensive guide, we will explore the specifics of AISI 347 stainless steel, including its composition, properties, applications, and more.

AISI 347 Stainless Steel

Composition of AISI 347 Stainless Steel

The composition of AISI 347 stainless steel plays a critical role in its performance. Here is a detailed breakdown of its chemical makeup:

ElementPercentage
Chromium (Cr)17-19
Nickel (Ni)9-12
Carbon (C)0.08 max
Manganese (Mn)2.0 max
Silicon (Si)1.0 max
Phosphorus (P)0.045 max
Sulfur (S)0.03 max
Columbium (Cb)10 x C min
Iron (Fe)Balance

Properties and Characteristics

AISI 347 stainless steel boasts a unique combination of mechanical and chemical properties:

  • Corrosion Resistance: Excellent, especially in environments exposed to high temperatures.
  • Tensile Strength: Approximately 515 MPa (75 ksi).
  • Yield Strength: Approximately 205 MPa (30 ksi).
  • Elongation: 40% in 50 mm.
  • Hardness: Brinell hardness of 201.

Applications of AISI 347 Stainless Steel

AISI 347 stainless steel is used in various applications due to its ability to withstand high temperatures and resist corrosion. Some of the primary applications include:

ApplicationDescription
Aerospace ComponentsIdeal for parts exposed to high temperatures.
Chemical Processing EquipmentUsed in tanks, pipes, and heat exchangers due to its corrosion resistance.
Power GenerationEmployed in turbine blades and other components in power plants.
Food ProcessingUtilized in equipment that requires sanitation and durability.
Oil and GasSuitable for pipelines and offshore platforms.
PharmaceuticalsApplied in equipment where contamination prevention is critical.
Automotive Exhaust SystemsUsed for parts that must withstand high heat and corrosive gases.

Specifications, Sizes, Grades, and Standards

AISI 347 stainless steel is available in various sizes and grades, making it versatile for different applications. Here’s a table outlining common specifications:

SpecificationDetails
ASTM A240Standard for chromium and chromium-nickel stainless steel.
ASTM A312Standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes.
ASTM A403Standard for wrought austenitic stainless steel fittings.
Sheet Thickness0.1mm to 4mm
Plate Thickness4mm to 100mm
Pipe Diameter0.5 inch to 24 inches
Bar Diameter1mm to 500mm

Suppliers and Pricing

Pricing for AISI 347 stainless steel can vary based on market conditions, quantity, and specific requirements. Here is an overview of typical suppliers and price ranges:

SupplierProductPrice Range (USD)
Company ASheets and Plates$3 – $5 per kg
Company BPipes and Tubes$4 – $6 per kg
Company CBars and Rods$3.5 – $6.5 per kg
Company DCustomized Components$5 – $8 per kg

Pros and Cons of AISI 347 Stainless Steel

Understanding the advantages and limitations of AISI 347 stainless steel helps in making informed decisions for specific applications. Here’s a detailed comparison:

AspectAdvantagesDisadvantages
Corrosion ResistanceExcellent in high-temperature environmentsLess effective in low temperatures
Mechanical PropertiesHigh tensile and yield strengthRelatively high cost compared to other steels
Temperature StabilityMaintains strength at high temperaturesCan be difficult to machine
WeldabilityGood weldabilityRequires preheating and post-weld treatments

Metal Powder Models of AISI 347 Stainless Steel

In the realm of metal powders for additive manufacturing and other applications, AISI 347 stainless steel is available in various models, each tailored for specific uses. Here are ten notable metal powder models:

  1. AISI 347-LP (Low-Particle)
  • Optimized for high-resolution printing with minimal particle size.
  1. AISI 347-HP (High-Performance)
  • Enhanced mechanical properties for demanding applications.
  1. AISI 347-CF (Corrosion-Resistant Fine)
  • Ideal for environments requiring fine detailing and high corrosion resistance.
  1. AISI 347-AP (Additive Printing)
  • Specifically designed for 3D printing and additive manufacturing.
  1. AISI 347-TF (Thermal Fatigue Resistant)
  • Engineered to withstand thermal cycling and fatigue.
  1. AISI 347-SP (Surface Polished)
  • Provides a superior finish for applications requiring smooth surfaces.
  1. AISI 347-WP (Wear-Resistant Powder)
  • Enhanced wear resistance for parts subjected to friction.
  1. AISI 347-HT (High Temperature)
  • Optimal performance at elevated temperatures.
  1. AISI 347-MP (Multi-Purpose)
  • Versatile powder suitable for a range of applications.
  1. AISI 347-FG (Fine Grain)
    • Ensures fine grain structure for precise manufacturing.

Advantages of AISI 347 Stainless Steel

AISI 347 stainless steel offers numerous benefits that make it a preferred choice in various industries:

Corrosion Resistance

One of the standout features of AISI 347 stainless steel is its excellent corrosion resistance, particularly in environments where high temperatures are a factor. This makes it ideal for chemical processing, power generation, and aerospace applications.

High Temperature Stability

AISI 347 maintains its strength and structural integrity at elevated temperatures, making it suitable for use in high-temperature environments like turbine engines and exhaust systems.

Mechanical Strength

The mechanical properties of AISI 347, including its tensile strength and yield strength, are impressive. This makes it a reliable choice for applications requiring robust and durable materials.

Versatility

With its wide range of forms (sheets, plates, pipes, bars), AISI 347 can be used in various industries, from aerospace to pharmaceuticals. Its versatility ensures it can meet the demands of different applications effectively.

Disadvantages of AISI 347 Stainless Steel

Despite its numerous advantages, AISI 347 stainless steel does have some limitations:

Cost

AISI 347 is relatively expensive compared to other stainless steels. This higher cost can be a factor in budget-sensitive projects.

Machinability

The material can be difficult to machine, requiring specialized equipment and techniques. This can add to the overall cost and complexity of manufacturing processes.

Limited Low-Temperature Performance

While AISI 347 excels in high-temperature environments, its performance in low-temperature settings is less impressive. This limitation can restrict its use in certain applications.

Comparison of AISI 347 Stainless Steel with Other Grades

Comparing AISI 347 with other stainless steel grades helps in understanding its unique position in the market:

PropertyAISI 347AISI 304AISI 316AISI 321
Corrosion ResistanceExcellent (high temp)GoodExcellent (general)Good (high temp)
Tensile Strength515 MPa505 MPa515 MPa515 MPa
Yield Strength205 MPa215 MPa240 MPa205 MPa
Temperature ResistanceExcellent (up to 800°C)Moderate (up to 500°C)Good (up to 600°C)Excellent (up to 800°C)
CostHighModerateHighHigh
AISI 347 Stainless Steel

FAQ

What is AISI 347 stainless steel?

AISI 347 (also known as UNS S34700) is a type of austenitic stainless steel formulated for use in wrought products (products shaped by hammering, pressing, or rolling). It’s known for its resistance to a phenomenon called weld decay, which can weaken other types of stainless steel at high temperatures [ONSULT MakeItFrom.com].

What are the key properties of AISI 347?

  • Good high-temperature strength: AISI 347 maintains its strength even at elevated temperatures, making it suitable for applications like boilers and furnace parts.
  • Resists weld decay: The inclusion of niobium (Nb) in its composition prevents chromium carbide precipitation near welds, which can cause weakness in other stainless steels [ONSULT Online Metals].
  • Good corrosion resistance: Like other stainless steels, AISI 347 offers good resistance to corrosion.
  • Ductile and workable: It can be easily formed and shaped.

What are some applications of AISI 347?

  • Aircraft exhaust systems
  • Boiler casings and heat exchangers
  • Heaters and furnace components
  • Welding equipment
  • Chemical processing equipment [ONSULT Online Metals]

What are some things to consider when using AISI 347?

  • While it offers good corrosion resistance, it may not be suitable for all corrosive environments. Consult with a material specialist for specific applications.
  • AISI 347 is not magnetic.
  • It is considered moderately machinable.

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