GREYSTONE® MATTESTAINLESS STEEL

When your roofing application, architectural

or wall panel systems demand durability,

flexibility, cost efficiency and beauty, install

GREYSTONE Matte Stainless Steel from

AK Steel. GREYSTONE Matte Type 304

and Type 316 provides an outstanding

alternative to other metal and traditional

architectural products.

Wall Panel System

Roofing

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GREYSTONE MATTE STAINLESS STEEL

Product DescriptionGREYSTONE Matte Stainless Steel is a rolled-on, non-directional, pebble-like finish designed to minimize the glare of sunlight.This specialty finish, available from AK Steel, combines aesthetic appeal, design flexibility, corrosion protection, strength, long life and low maintenance. This combination of advantages makes GREYSTONE Matte Stainless Steel ideal for roofing systems in a wide range of commercial, residential and marine environments.

In addition, the excellent strength-to-weight ratios of stainless steels result in superior design flexibility that may reduce material and labor costs. Unlike many other roofing materials, GREYSTONE Matte Stainless Steel will maintain finish. As a result, they provide matchless and long-lasting beauty and exceptional durability. GREYSTONE Matte Stainless Steel’s low reflectivity and ease of cleaning are also highly appreciated by designers, architects, builders and owners. Because of its resistance to fading, chipping, and corrosion, maintenance costs are minimal and visual appeal is timeless.

Composition Type 304(wt %)

Type 304L(wt %)

Type 316(wt %)

Type 316L (wt %)

Carbon (C) 0.08 max. 0.03 max. 0.08 max. 0.03 max.

Manganese (Mn) 2.0 max. 2.0 max. 2.0 max. 2.0 max.

Phosphorus (P) 0.045 max. 0.045 max. 0.045 max. 0.045 max.

Sulfur (S) 0.030 max. 0.03 max. 0.03 max. 0.03 max.

Silicon (Si) 0.75 max. 0.75 max. 0.75 max. 0.75 max.

Chromium (Cr) 18.0 – 20.0 18.0 – 20.0 16.0 – 18.0 16.0 – 18.0

Nickel (Ni) 8.0 – 12.0 8.0 – 12.0 10.0 – 14.0 10.0 – 14.0

Nitrogen (N) 0.10 max. 0.10 max. – –

Molybdenum (Mo) – – 2.0 – 3.0 2.0 – 3.0

Iron (Fe) Balance Balance Balance Balance

AVAILABLE FORMSType 304 and Type 316 are available in thicknesses from 0.015 – 0.075 in. and widths up to 48 in., depending on the thickness. For sizes outside these limits, contact your AK Steel sales representative.

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GREYSTONE MATTE STAINLESS STEEL

PropertiesTABLE 1 – TYPICAL MECHANICAL PROPERTIES

Grade UTS,ksi. (MPa)

0.2% YS,ksi. (MPa)

Elongation % in 2" (50.8 mm)

RockwellHardness, B

Type 304 85 (586) 35 (241) 55 80

Type 304L 90 (621) 42 ( 290) 55 82

Type 316 84 (579) 42 (290) 50 79

Type 316L 81 (558) 42 (290) 50 79

PHYSICAL PROPERTIES

304 L/304L 316/316L

Density, lb./in.3 (g/cm3) 0.29 (8.03) 0.29 (7.99)

Electrical Resistivity, µΩ•in. (µΩ•cm)

68 °F (20 °C)1200 °F (659 °C)

28.4 (72)

45.8 (116)

29.4 (74)

–

Specific Heat, BTU/lb./°F (kJ/kg/K)

32 – 212 °F (0 – 100 °C) 0.12 (0.50) 0.12 (0.50)

Thermal Conductivity, BTU/hr./ft./°F (W/m/K)

at 212 °F (100 °C) at 932 °F (500 °C)

9.4 (16.2)12.4 (21.4)

9.4 (16.2)12.4 (21.4)

Mean Coefficient of Thermal Expansion, in./in./°F (µm/m/K)

32 – 212 °F (0 – 100 °C)32 – 600 °F (0 – 315 °C)

32 – 1000 °F (0 – 538 °C)32 – 1200 °F (0 – 649 °C)32 – 1500 °F (0 – 871 °C)

9.4 x 10-6 (16.9)9.6 x 10-6 (17.3)

10.2 x 10-6 (18.4)10.4 x 10-6 (18.7)

–

8.9 x 10-6 (16.0)9.0 x 10-6 (16.2)9.7 x 10-6 (17.5)

10.3 x 10-6 (18.5)11.1 x 10-6 (19.9)

FORMABILITYTypes 304/304L and Types 316/316L have very good formability. Their combination of low-yield strength and high elongation permits successful forming of even complex shapes.

WELDABILITYThese grades of austenitic stainless steels are weldable by common fusion and resistance techniques. Types 304 and 304L are generally considered to be the most common alloys of this stainless class.

TECHNICAL ASSISTANCETechnical Representatives from AK Steel can provide you with more detailed information on Type 304 and Type 316. They are also available to assist you in answering welding, forming, painting or other material selection questions you may have.

LIMITED WARRANTYAK Steel Corporation offers a limited warranty on certain stainless steel grades used in architectural applications (i.e. roofing and exterior wall panels). Reference the AK Steel website or contact your AK Steel sales representative for details.

Painted Galvalume® 1.0

Aluminized Type 1 409 1.3

Aluminized Type 1 439 1.4

Type 304 1.4

Type 316 1.5

Zinc 3.4This chart illustrates the hypothetical cost.

FIGURE 1 – COST COMPARISONSGrade Relative Cost Index

MAKING INNOVATION HAPPEN

S A F E T Y | Q U A L I T Y | P R O D U C T I V I T Y | I N N O V A T I O N

AK Steel Corporation9227 Centre Pointe DriveWest Chester, OH 45069844.STEEL99 | 844.783.3599

www.aksteel.comsales@aksteel.com

AK Steel is a leading producer of flat-rolled carbon, stainless and electrical steel products, primarily for the automotive, infrastructure and manufacturing, electrical power generation and distribution markets. Through its subsidiaries, the company also provides customer solutions through carbon and stainless steel tubing products, die design and tooling, and hot and cold stamping. Headquartered in West Chester, Ohio (Greater Cincinnati), the company employs approximately 9,200 men and women at manufacturing operations across seven states (Alabama, Indiana, Kentucky, Michigan, Ohio, Pennsylvania and West Virginia), as well as Canada and Mexico. Additional information about AK Steel is available at www.aksteel.com.

The information and data in this document are accurate to the best of our knowledge and belief, but are intended for general information only. Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other applications.

Data referring to material properties are the result of tests performed on specimens obtained from specific locations of the products in accordance with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations.

AK and the AK Steel logo are registered trademarks of the AK Steel Corporation. ©2018 AK Steel. All Rights Reserved. 7.18