Iron Base Alloys 317L

Overview of Iron Base Alloys 317L

Iron Base Alloys 317L are austenitic stainless steel known for their exceptional corrosion resistance and high-temperature performance. They are an ideal choice for demanding environments where both mechanical strength and resistance to corrosion are critical. This alloy is extensively used in the chemical, petrochemical, and power generation industries.

Types, Composition, Properties, and Characteristics

Applications of Iron Base Alloys 317L

Specifications, Sizes, Grades, and Standards

Suppliers and Pricing Details

Comparing Pros and Cons: Advantages and Limitations

Detailed Descriptions of Specific Metal Powder Models

1. 317L-GP: General purpose powder, excellent for additive manufacturing and thermal spraying, offering good corrosion resistance.
2. 317L-FS: Fine spherical powder, ideal for detailed 3D printing applications.
3. 317L-HA: High alloy variant, with enhanced nickel and molybdenum content for better corrosion resistance.
4. 317L-LD: Low density powder, optimized for lightweight components without compromising strength.
5. 317L-CR: Corrosion-resistant powder, specifically formulated for harsh chemical environments.
6. 317L-WD: Weld-deposit powder, designed for seamless and durable welds.
7. 317L-TP: Thermal protection powder, used for coatings that protect against high temperatures.
8. 317L-MS: Machining-specific powder, optimized for parts that require precise machining.
9. 317L-AM: Additive manufacturing powder, with excellent flow properties for 3D printing.
10. 317L-HS: High-strength powder, used where mechanical strength is paramount.

Composition of Iron Base Alloys 317L

Iron Base Alloys 317L primarily consist of iron, with significant amounts of chromium (18-20%) and nickel (11-15%). The addition of 3-4% molybdenum enhances corrosion resistance, especially against chlorides and other industrial chemicals. The low carbon content (≤0.03%) minimizes carbide precipitation during welding, maintaining the alloy’s integrity.

Characteristics of Iron Base Alloys 317L

Corrosion Resistance

Iron Base Alloys 317L exhibit superior resistance to pitting and crevice corrosion, especially in acidic and chloride-rich environments. This makes them ideal for use in chemical processing and marine applications.

Mechanical Properties

These alloys maintain excellent mechanical properties even at elevated temperatures. They offer good tensile strength, durability, and toughness, which are essential for demanding industrial applications.

Weldability

The low carbon content of 317L significantly reduces the risk of carbide precipitation during welding. This characteristic, combined with excellent weldability, makes it suitable for complex fabrications.

High-Temperature Performance

317L alloys maintain their strength and stability at high temperatures, making them suitable for applications involving heat exchangers, boilers, and other high-temperature environments.

Advantages of Iron Base Alloys 317L

Enhanced Corrosion Resistance

Compared to other stainless steels, 317L provides superior resistance to a wide range of corrosive environments. This includes resistance to sulfuric, acetic, formic, and citric acids, as well as brine solutions and chlorine compounds.

Extended Service Life

The durability and robust nature of 317L alloys extend the service life of components, reducing the need for frequent replacements and maintenance. This translates to cost savings over time.

Versatility

These alloys can be used in a variety of industries, from chemical processing to food production, due to their excellent combination of mechanical properties and corrosion resistance.

Applications of Iron Base Alloys 317L

Iron Base Alloys 317L are versatile materials used across multiple industries due to their unique properties. Let’s delve into some of the most common applications:

Chemical Processing

In chemical plants, 317L is often used for piping, heat exchangers, and reactors. Its resistance to various chemicals ensures longevity and reliability in processing environments.

Petrochemical Industry

For the storage and transportation of petrochemical products, 317L is preferred for its corrosion resistance and ability to withstand harsh conditions. It’s commonly used in storage tanks and piping systems.

Power Generation

In power plants, 317L alloys are used in boiler tubes and heat exchangers. Their ability to maintain strength at high temperatures makes them suitable for these demanding applications.

Pharmaceuticals

The pharmaceutical industry utilizes 317L for processing equipment and storage tanks, ensuring that the materials in contact do not corrode or contaminate the products.

Food Processing

In the food industry, 317L stainless steel is used for equipment and containers to prevent contamination and ensure hygiene due to its excellent resistance to corrosion and ease of cleaning.

Detailed Specifications, Sizes, Grades, and Standards

ASTM A312

This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. Sizes range from 1/8″ to 24″ in diameter.

ASTM A276

This standard specification encompasses various forms of stainless steel bars and shapes, including rounds, squares, and hexagons. Available in various sizes, these bars are used in applications requiring high strength and corrosion resistance.

ASME SA 240

This specification covers chromium and chromium-nickel stainless steel plates, sheets, and strips for pressure vessels and for general applications. It ensures the material’s high quality and suitability for pressure and structural applications.

ASTM A358

This specification pertains to electric-fusion-welded austenitic chromium-nickel alloy steel pipe suitable for corrosive or high-temperature service. It covers pipe sizes from large diameters to specified lengths and thicknesses.

Suppliers and Pricing Details

Iron Base Alloys 317L are available from various suppliers at different price points, depending on the quantity and form required. Here’s a closer look at some suppliers and their pricing:

Metal Supermarkets

Offering a wide range of metals, including 317L, Metal Supermarkets provides this alloy at prices ranging from $15 to $30 per pound, depending on the size and quantity.

Online Metals

This supplier provides convenient online purchasing options for 317L alloys, with prices typically between $18 and $35 per pound. They offer various shapes and sizes for immediate shipment.

Grainger

A well-known supplier of industrial products, Grainger offers 317L alloys at $20 to $40 per pound. Availability may vary, and some products are available upon request.

McMaster-Carr

Renowned for its vast inventory, McMaster-Carr supplies 317L alloys priced between $22 and $45 per pound. Most items are ready to ship, ensuring quick delivery.

Specialty Steel

Specialty Steel focuses on custom orders and high-quality stainless steels, including 317L. Pricing ranges from $25 to $50 per pound, reflecting the customized nature of their products.

Comparing Pros and Cons: Advantages and Limitations

When considering Iron Base Alloys 317L for your application, it’s essential to weigh the advantages and limitations:

Pros

• Corrosion Resistance: Superior in aggressive environments, making it ideal for chemical and petrochemical applications.
• Weldability: Excellent, thanks to the low carbon content, which reduces the risk of carbide precipitation.
• High-Temperature Performance: Maintains strength and stability, even at elevated temperatures.
• Availability: Readily available from multiple suppliers, ensuring you can find the alloy in various forms and sizes.

Cons

• Cost: More expensive than other stainless steels like 304 or 316, which may be a consideration for budget-conscious projects.
• Expertise Required: Welding and fabrication of 317L alloys require skilled professionals to ensure the best results and avoid potential issues like carbide precipitation.

FAQ

What is 317L stainless steel used for?

317L stainless steel is used in applications requiring high corrosion resistance and high temperature strength, such as chemical processing, petrochemical industry, power generation, pharmaceuticals, and food processing.

How does 317L compare to 316L stainless steel?

317L has a higher molybdenum content compared to 316L, which provides better corrosion resistance, especially in chloride environments. However, 317L is generally more expensive than 316L.

Can 317L stainless steel be welded?

Yes, 317L stainless steel can be welded. Its low carbon content minimizes the risk of carbide precipitation during welding, making it suitable for various welding methods.

What are the main components of 317L stainless steel?

The main components of 317L stainless steel are iron, chromium (18-20%), nickel (11-15%), and molybdenum (3-4%). It also contains a low carbon content (≤0.03%).

Is 317L stainless steel suitable for high-temperature applications?

Yes, 317L stainless steel maintains its strength and stability at high temperatures, making it suitable for applications such as heat exchangers and boiler tubes.

Where can I buy 317L stainless steel?

317L stainless steel can be purchased from various suppliers including Metal Supermarkets, Online Metals, Grainger, McMaster-Carr, and Specialty Steel. Prices range from $15 to $50 per pound depending on the supplier and form of the alloy.

How does 317L resist corrosion?

317L resists corrosion due to its high chromium and molybdenum content, which provides protection against pitting and crevice corrosion, especially in acidic and chloride-rich environments.

What sizes and forms are available for 317L stainless steel?

317L stainless steel is available in various sizes and forms, including pipes, plates, sheets, bars, and custom shapes. Specifications such as ASTM A312, ASTM A276, ASME SA 240, and ASTM A358 cover these forms.

Is 317L stainless steel food-safe?

Yes, 317L stainless steel is considered food-safe and is commonly used in food processing equipment and containers due to its corrosion resistance and ease of cleaning.

What industries commonly use 317L stainless steel?

Industries that commonly use 317L stainless steel include chemical processing, petrochemical, power generation, pharmaceuticals, and food processing. Its unique properties make it suitable for these demanding applications.

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