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Clad Plate
High Performance Clad Metals for Premium Induction Cookware
Clad Metals for Pressure Vessels in Chemical Processing, Power Generation, Flue Gas Desulfurization and Electrochemical

Clad Plate

AMETEK's Specialty Metal Products Division has been a leader in developing the technology of roll bonding dissimilar metals for more than three decades. The advantage of clad materials is that the end product combines the superior properties of each metal — strength, corrosion resistance, lightweight, lower cost, and thermal and electric conductivity — to produce a material superior to that of any of the individual metals taken alone.

Clad metals produced by our roll bond technology combine two or more metals into a single sheet or plate that can be cut, welded or formed into a finished part ranging from chemical processing chambers and pressure vessels to small applications and clad pipe. We specialize in cladding stainless to carbon steel.

Because of the properties offered by clad metals, and the wide variety of cladding and backing materials available today, these metals can be combined to make custom materials for a wide range of demanding industries, including health, chemical and petroleum processing, paper and pulp, food and food processing.

If the problem is unique, then the solution could well be a clad metal. In all cases, clad metals provide combinations of properties and advantages not available in monolithic metals.

Manufacturing

AMETEK clad materials are manufactured by roll bonding a backing with a specialty metal to produce a metallurgically bonded clad. Many metals can be combined through this technique to provide a custom metal with the specific properties desired by the designer.

Our clad materials are available in standard widths to 120", lengths to 480", 1 and thicknesses ranging from 3/16 inch to 1". Cladding on the steel backing can be supplied in a range of thicknesses from 5 to 40 percent of the overall material thickness.

The Thermal Conductivity advantages of Roll Bonded Clad Plate are:

  • Thermal Conductivity of Carbon Steel (25°C) Average
    Value 46 W/m
  • K
  • Thermal Conductivity of our SS/LCS Clad Plate (25°C) Average
    Value 34 W/m
  • K
  • Thermal Conductivity of 400L Series Steel (25°C) Average
    Value 24 W/m
  • K
  • Thermal Conductivity of 300L Series Steel (25°C) Average
    Value 16 W/m
  • K

Improved conductivity over solid Stainless – while retaining the cleanliness and appearance of Stainless Steel.

Our primary composite material is stainless clad steel, however our metallurgists are always available to assist you in developing custom product specifications. We can further process clad sheet and plate to meet specifications for close dimensional and flatness tolerances, glass beading or sand blasting one or both sides, cutting to circles or special shapes.

Processing

Roll bonding is achieved by processing a specially prepared "sandwich" (layers of backing and cladding materials) through a conventional plate hot rolling mill that reduces the thickness and metallurgically bonds the backing steel to the clad material. Parting compound is used between each clad pack before it is welded and then roll bonded to yield two separate clad plates.

After cutting to finish size, the bonded plates are cleaned by blasting with an abrasive mixed with glass beads to obtain a clean, relatively bright surface, both top and bottom, if desired.

Fabrication

Clad plate can be fabricated into different shapes, which allows designers the freedom to produce custom products for a wide range of applications.

Forming: Clad materials can be cut and formed by most shop operations, which include shearing, plasma cutting, drawing, bending, hot forming, machining, drilling and punching.

Welding: Fusing of clad materials is usually done by first welding the backing material using appropriate filler material and then welding the clad side with a welding electrode or filler metal appropriate to that surface.

Quality Control, Testing

Generally, clad plate is produced to meet or exceed either ASME A-264 or ASME A-265 codes. To meet these specifications, AMETEK routinely performs tensile tests, shear tests, hardness, bend tests and impact tests (Charpy V-Notch) on modern testing equipment. Other services, as specified by the customer, are also available such as ultrasonic testing, thermal treatment and saw cutting.

AMETEK's total quality control begins with our selection of high quality raw materials and follows through to an on-time delivery of the finished product to our customers.

Inventory

In order to meet relatively short delivery times, AMETEK maintains an inventory of A-285 Grade C and A-516 Grade 70 carbon steel, and 304L and 316L stainless steel.

We also:

  • Provide a raw material inventory and Just-In-Time stocking programs for high-volume users.
  • Supply small quantities for specialized requirements, and some stock plates that are available upon request.

AMETEK Specialties Include:

  • Stainless clad carbon steel

Clad Plate Capabilities:

  • Thickness from 3/16" (4.8mm) to 1" (25.4mm)
  • Widths to 120" (3,048mm)
  • Lengths to 480" (12,000mm)
  • Surface Grinding (#3 & #4 finish)
  • Normalizing & Solution Anneal
  • Ultrasonic Testing to SA 578
  • % Clad: 5% to 40%
  • Weight/Plate: 8,000 lbs. max. (finished)

Alloys

  • 304L
  • 316L
  • 317L

View our Clad Plate Brochure

*Trademarks of Inco Alloys International, Inc.
Trademarks of Cartech Inc.


High Performance Clad Metals for Premium Induction Cookware

Stainless Steel Clad Aluminum: Giving You the Market Advantage for Induction Cookware

Stainless steel clad aluminum is ideal for high-performance cookware. This engineered material is more economical than other material compositions and is formed using our proprietary roll bonding and thermal treatment process to produce a strong metallurgical bond. In fact, the bond strength between the stainless steel and aluminum layers is equal to the shear strength of the aluminum. Stainless clad also offers excellent vacuum integrity, as well as superior thermal and electrical conductivity. Its key benefits are:

  • Outstanding corrosion resistance
  • Higher fabrication yield
  • Lower processing rejects
  • High strength
  • High induction rate

The unique properties of stainless steel clad aluminum make it ideal for a wide variety of applications, including:

  • Cookware
  • Aircraft components
  • Transition joints
  • Electronic packaging
  • Structural systems

ALCOR 7-Ply:
The Magic Recipe for Induction Cooking

ALCOR 7™-Ply stainless steel clad aluminum combines the durability and appearance of T-304 stainless steel with the magnetic characteristics of ferritic stainless.

The superior induction properties and life span of ALCOR 7-Ply result from a layer of magnetic stainless steel being sandwiched between two layers of T-304 stainless. This material composition prevents the ferritic stainless from corroding, which keeps cookware made with ALCOR 7-Ply in top working condition year after year.

ALCO 7-Ply offers a unique array of properties that makes it ideal for cookware which can be used on any kind of range or cooktop stove powered by gas, resistance-heated electric or induction-heated electric.

The thin layers of T-304 protecting ALCOR 7-Ply ferritic stainless steel allow for even heating and minimization of "hot spots" that gas, electric and induction heating tends to produce on cookware made of lower-grade metals.

To make premium cookware, you need to start with a top-quality material. ALCOR 7-Ply meets that standard.

Other Stainless Steel Clad Aluminum Products You Should Consider

Alternatives to ALCOR 7-Ply that can also be used to manufacture high-performance cookware include:

ALCOR 5-Ply Magnetic (MagnaPly), a special combination of T-304 Stainless Steel and Magnet 400 Series Stainless that can be used on induction heating and conventional ranges. Less ductile than ALCOR 7-Ply and ALCOR 5-Ply, it can be used for various drawn shapes.

ALCOR 5-PLY (Duranel™ III), an aluminum core with T-304 Stainless Steel cladding. The cladding is .015" thick and bonded to both sides of 3-Ply 304, and 1145 Aluminum is on each side.

ALCLAD™ (Duranel I or II), which consists of T-304 Stainless Steel clad on one side of 2- or 3-Ply 3004 Aluminum with 1145 Aluminum on one or both sides. Stainless claddings range from thicknesses of .015" to .250".

If you're manufacturing cookware for any type of appliance or heat source, there's an AMETEK alloy that's right for you.

Fabrication Guidelines for Stainless Steel Clad Aluminum

DRAWING RECOMMENDATIONS

Stainless steel clad aluminum has the deep drawing characteristics required for induction cookware applications. For best results, reduction from blank diameter to cup diameter should not exceed 40% as determined by this formula:

Guidelines for deep drawing ALCOR are similar to those used for solid steel and carbon core. Fabrication suggestions are:

  • Draw ring radius: 6x-8x metal thickness
  • Draw punch radius: 8x-10x metal thickness
  • Set down radius: 2x metal thickness
  • Clearance between punch & draw ring: Metal thickness + 5%-10% per side
  • Hold-down pressure: Sufficient to prevent wrinkling, but allows metal to flow into die
  • Lubricants: Same as for deep drawing stainless steel; water-oil-based or synthetic-based fluids acceptable
  • Clearance on blanking & trim tools: Approximately 4%-5% of metal thickness per side; scrap drop-off from trim should be 2x-3x metal thickness
  • Keep tools, lubricants & material clean during fabrication because relatively soft-core material will mark deeper & more easily than solid stainless steel
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