Stainless Steel - Austenitic - 1.4401 (316) Sheet And Plate

Stainless Steel - Austenitic - 1.4401 (316) Sheet And Plate

Stainless Steel - Austenitic - 1.4401 (316) Sheet and Plate Which Stainless Steel? Stainless steels are not only categorized by the alloy metal content but also by their crystalline structure. The 300 series stainless steels, covered specifically in this article, have an austenitic crystalline...
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Stainless Steel - Austenitic - 1.4401 (316) Sheet and Plate

Which Stainless Steel?

Stainless steels are not only categorized by the alloy metal content but also by their crystalline structure. The 300 series stainless steels, covered specifically in this article, have an austenitic crystalline structure, which is face-centered cubic with four atoms in the unit cell for higher density. In fact, these Austenite steels make up more than 70% of total stainless-steel production and are the most popular material across a variety of industries including: pharmaceutical, food production, and building.


They possess a maximum of 0.15% carbon (low carbon is vital to the properties of stainless steel), a minimum of 16% chromium, and adequate nickel and/or manganese to retain an austenitic structure at temperatures ranging from the cryogenic region to the melting point of the alloy. As a reference, a representative composition of 18% chromium and 10% nickel, normally known as 18/10 stainless, is often used to manufacture cutlery.


Grade 316 is an austenitic grade second only to 304 in commercial importance. 316 stainless steel contains an addition of molybdenum that gives it improved corrosion resistance. This is particularly apparent for pitting and crevice corrosion in chloride environments.


The austenitic structure of 316 stainless steel gives excellent toughness, even at cryogenic temperatures.
Property data given in this document is typical for flat rolled products covered by EN 10088-2:2005. ASTM, EN or other standards may cover all products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.

Chemical Composition

Spec: EN 10088-2:2005 1.4401 Steel

Chemical Element% Present

C

0.0 - 0.07

Cr

16.50 - 18.50

Mo

2.00 - 2.50

Si

0.0 - 1.00

P

0.0 - 0.05

S

0.0 - 0.02

Ni

10.00 - 13.00

Mn

0.0 - 2.00

N

0.0 - 0.11

Fe

Balance


Properties

Physical PropertyValue

Melting Point

1400 °C

Thermal Expansion

15.9 x10^-6 /K

Thermal Conductivity

16.3 W/m.K

Electrical Resistivity

0.074 x10^-6 Ω .m


Spec: EN 10088-2:2005 Sheet - Up to 8mm Thick

Mechanical PropertyValue

Proof Stress (MPa)

240 Min

Tensile Strength (MPa)

530 to 680 

Elongation A50 mm

40 Min %


Spec: EN 10088-2:2005 Plate - From 8mm to 75mm Thick

Mechanical PropertyValue

Proof Stress (MPa)

220 Min

Tensile Strength (MPa)

520 to 670

Elongation A50 mm

45 Min %


300 Series

The 304 (A2) is the most extensively used austenitic stainless-steel and this is also known as 18/8 to describe its composition of 18% chromium and 8% nickel. The 304 stainless steel has good oxidation resistance in intermittent service up to 870 °C and in continuous service up to 925 °C.


The second most frequently-used austenitic stainless-steel is the 316 grade (A4), which is also known as marine grade stainless, and used mainly for its increased resistance to corrosion. Type 316 is fundamentally an austenitic chromium- nickel stainless steel that contains an extra 2-3% molybdenum. The molybdenum boosts general corrosion resistance, enhances resistance to pitting from chloride ion solutions (for instance seawater and de-icing salts), and offers increased strength at elevated temperatures.


What is the Difference Between 304 and 316 Stainless Steel?

The straightforward answer is that 304 has 18% chromium and 8% nickel while 316 has 16% chromium, 10% nickel and 2% molybdenum. Both of these 300 grade steels are known for their excellent welding and forming properties, which give them applications across many industries. Masteel is a key supplier of 304 and 316 grades of stainless steel and can provide both cut profiles and advice on fabrication and properties.


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