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Grade 310S / 310SL | UNS S310S00 / UNS S310S03 | 1.4401 / 1.4404
These steels are the second most regularly specified stainless steels after Type 310S and are part of the SAE defined 300 Series which encompasses a range of austenitic chromium-nickel alloys. Austenitic stainless steels like Type 310S are widely available, have good general corrosion resistance, good cryogenic toughness, and excellent formability and weldability.
Type 310S has 2-3% Molybdenum included in its chemical composition which prevents specific forms of corrosion and generally enhances its corrosion resistance. Type 310S is often referred to as “marine grade” stainless due to its increased resistance to chloride corrosion compared to Type 310S making it a very suitable material for use in salt water environments.
Type 310SL is a variant of Type 310S and differs by having a lower Carbon content as well as slightly lower yield and tensile strengths. Type 310SL 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 310S 1.4401 (EN Steel Number) S310S00 (UNS)
● Type 310SL1.4404 (EN Steel Number) S310S03 (UNS)
310S / 310SL Stainless Steel Properties:
Typical chemical and mechanical properties of Type 310S and Type 310SL steel:
| Chemical Analysis (%) | PREN | Mechanical Properties | ||||||||
| C | Cr | Ni | Mo | Proof Stress | Tensile | Elongation | ||||
| 310S | 0.08 | 17 | 11.5 | - | 24 | 255 | 550-700 | 40 | ||
| 310SL | 0.03 | 17 | 11.5 | - | 24 | 220 | 520-670 | 40 | ||
Typical industrial sectors:
● Brewing
● Chemical Industry
● Dairy
● Food processing
● Marine equipment
● Petrochemicals
● Pharmaceuticals
Typical product applications:
● Condensers
● Heat Exchangers
● Filters
● Pressure Vessels
● Valves
● Flanges and Fittings
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