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347 Stainless Steel Plates

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Grade 347 / 347L | UNS S34700 / UNS S34703 | 1.4401 / 1.4404These steels are the second most regularly specified stainless steels after Type 347 and are part of the SAE defined 300 Series which encompasses a range of austenitic chromium-nickel alloys. Austenitic stainless steels like Type 347 are widely available, have good general corrosion resistance, good cryogenic toughness, and excellent formability and weldability.Type 347 has 2-3% Molybdenum included in its chemical composition which prevents specific forms of corrosion and generally enhances its corrosion resistance. Type 347 is often referred to as “marine grade” stainless due to its increased resistance to chloride corrosion compared to Type 347 making it a very suitable material for use in salt water environments.Type 347L is a variant of Type 347 and differs by having a lower Carbon content as well as slightly lower yield and tensile strengths. Type 347L offers improved weldability and also reduces the possibility of lower corrosion resistance around welded areas.As with most steel plate products a number of different designations are used for these steels. The most common are:● Type 347 1.4401 (EN Steel Number) S34700 (UNS)● Type 347L1.4404 (EN Steel Number) S34703 (UNS) 347 / 347L Stainless Steel Properties:Typical chemical and mechanical properties of Type 347 and Type 347L steel:

















Chemical Analysis (%)
PREN
Mechanical Properties






C
Cr
Ni
Mo

Proof Stress
Tensile
Elongation




347
0.08
17
11.5
-
24
255
550-700
40




347L
0.03
17
11.5
-
24
220
520-670
40
















Typical industrial sectors:● Brewing● Chemical Industry● Dairy● Food processing● Marine equipment● Petrochemicals● PharmaceuticalsTypical product applications:● Condensers● Heat Exchangers● Filters● Pressure Vessels● Valves● Flanges and Fittings
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