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Stainless Steel Alloys

MWS inventories 5 different Stainless Steel Alloys in a variety of sizes and tempers.
When selecting wire for mechanical applications there are four classifications from which to choose a specific material or alloy. They are: nickel based lockwires, carbon steels, stainless steels and superalloys. A three-part evaluation procedure is recommended: 1) initial screening based on temperature and corrosion requirements; 2) analysis of physical properties; and 3) final screening on the basis of specific properties, material, and forming costs.



Properties

ALLOY # 302 304 316 321 17-7 PH
C
O
M
P
O
S
I
T
I
O
N
(%)
Carbon ( C ) max. .15 .08 .08 .08 .09
Manganese ( Mn ) max. 2 2 2 2 1
Silicon ( Si ) max. 1 1 1 1 1
Phosphorus ( P ) max. .045 .045 .045 .045 .04
Sulfur ( S ) max. .03 .03 .03 .03 .03
Chromium ( Cr ) 17 - 19 18 - 20 16 - 18 17 - 19 16 - 18
Nickel ( Ni ) 8 - 10 8 - 12 10 - 14 9 - 12 6.5 - 7.75
Iron ( Fe ) Balance Balance Balance Balance Balance
Others -- -- ( Mo )
2 - 3
( Ti ) 5 x( C ) minimum ( Al )
.75 - 1.5

NOMINAL TENSILE
STRENGTH (kpsi)

(size range: .002"-.032")
302 304 316 321 17-7 PH
ANNEALED 105 - 145 105 - 145 95 - 130 110 - 150 none listed
FULL HARD (SPRING) 300 - 360 300 - 360 245 - 275 225 - 275 260 - 295



Characteristics of Stainles Steel Alloys

SS 302 Most widely used stainless steel spring material due to its excellent combination of physical properties and corrosion resistance.
SS 304 Similar to Type 302 except for the slightly lower carbon and higher nickel, which results in a more ductile, lower tensile alloy in the annealed condition.  The major use of this alloy is in the annealed and 1/4 hard wire products such as cold heading wire, weaving, or screen wire, and lockwire.
SS 316 Molybdenum gives this material high creep strength at elevated temperatures and excellent corrosion resistance. (generally better then Types 302, 304, and 321.) Especially resistant to pit-type corrosion.
SS 321 Good where welding is used in fabrication or where heat is encountered as a service condition. Stabilized with titanium to prevent sensitization. (Carbide precipitation and intergranular corrosion.)
SS 17-7 Corrosion resistance comparable to Type 302 with physical properties comparable to music wire. Particularly useful where a compact, corrosion resistant spring is required. Considerably better than Type 302 for springs operating up to 600°F.



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Headquartered in Westlake Village, California USA, MWS inventories more than 50,000
Magnet and Specialty wires along with production facilities for drawing, shaping, serving,
twisting and insulating of wire for high-technology users worldwide.

Established in 1968