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Name:UNS S31600
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Brief introduction: UNS S31600
Grade S31600 is the molybdenum grade defined in the UNS system, which comes after the UNS S30400 in its importance within the austenitic stainless steels.
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316 Stainless Steel Strip, Coil, Foil, Wire, ASTM A666, AMS5524

316 STAINLESS STEEL APPLICATIONS
Pulp and Paper Equipment
Heat exchangers
Propeller shafts
Fittings
Dyeing Equipment
Exterior Architectural components in Marine Coastal Areas

WHAT IS 316 STAINLESS STEEL?
Type 316 (UNS 31600) is an austenitic chromium-nickel stainless steel alloy containing molybdenum. This addition increases corrosion resistance, improves resistance to pitting chloride ion solutions and provides increased strength at elevated temperatures. Properties of this austenitic stainless steel grade are similar to those of type 304 except that type 316 is somewhat stronger at elevated temperature ranges. In regards to formability, 304 stainless is usually a better option for forming operations because the higher molybdenum content in Grade 316 means that it possesses higher strength and work-hardening rates which can have adverse effects on formability. While 316 can typically be drawn and formed in a similar fashion to 304, temperature variations can make those processes challenging. For instance, the 316 alloy may become magnetic when cold worked.


Corrosion resistance is improved, particularly against sulfuric, hydrochloric, acetic, formic and tartaric acids, as well as corrosion caused by acid sulfates and alkaline chlorides.


The low carbon version of 316 Stainless is 316L Stainless Steel which has increased resistance to intergranular corrosion.

Composition

Table 1. Composition ranges for 316 grade of stainless steels.

Grade C Mn Si P S Cr Mo Ni N
316 Min - - - 0 - 16.0 2.00 10.0 -
Max 0.08 2.0 0.75 0.045 0.03 18.0 3.00 14.0 0.10
316L Min - - - - - 16.0 2.00 10.0 -
Max 0.03 2.0 0.75 0.045 0.03 18.0 3.00 14.0 0.10
316H Min 0.04 0.04 0 - - 16.0 2.00 10.0 -
max 0.10 0.10 0.75 0.045 0.03 18.0 3.00 14.0 -


Mechanical Properties

Table 2. Mechanical properties of 316 grade stainless steels.

Grade Tensile Str (MPa) min Yield Str 0.2% Proof (MPa) min Elong (% in 50 mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
316 515 205 40 95 217
316L 485 170 40 95 217
316H 515 205 40 95 217


Note: 316H also has a requirement for a grain size of ASTM no. 7 or coarser.


Mechanical Properties of S31600 Steels: Following are some of the mechanical properties of 420 steels:

  • The tensile strength of the 316 alloy steel is expressed in Newton per millimeters and it must be at-least 520 N/mm2 (MPa).
  • The elongation property of S31600 steel varies with the heat treatment process and thickness but it is indicated typically 40%.
  • S31600 can be welded by all fusion and resistance methods. But it is not weld able with oxyacetylene welding methods.
  • The maximum Brinell hardness is indicated around 217.
  • Corrosion resistance is higher than the other known austenitic grades.

Equivalent Material Grades in Other International Standards: Read more about the

  • Equivalent grade of this type in SAE is 316
  • In JIS designation, the corresponding material is referred as SUS 316 alloy.
  • In DIN standard, the corresponding material is referred as 1.4401 type steel.
  • In Swedish SS standard, the corresponding material is referred as 2347 type steel.
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