302 stainless steel is an Austenitic, non-magnetic, extremely tough and ductile stainless steel alloy. AISI 302 annealed stainless steel is highly corrosion resistant and maintains its strength at high temperatures up to 550°F (288°C). Additionally, 302 stainless steel is non-magnetic in the annealed condition and cannot be further hardened by heat treatment. As an added benefit both the hardness and tensile strength of AISI 302 can be increased by cold working. Annealed Stainless Steel Chemical & Physical Properties
The physical and chemical properties of AISI 302 stainless steel stampings are as follows:

Cr: 17.0 - 19.0%
Ni: 8.0 - 10.0%
Minimum tensile strength: psi x 103 185-230
Modulus of elasticity: psi x 106 28
Maximum operating temperature 550°F (288°C)
Rockwell hardness: C35-45

AISI 302 Stainless Steel ApplicationsAISI 302 stainless steel is ideal for custom flat springs and custom sheet metal stampings that require corrosion resistance and high temperatures capabilities. Common applications for AISI 302 annealed stainless steel, include:

Springs
Stampings
Wire Forming
Sanitary
Food & Beverage
Cryogenic
Pressure-Containing

AISI 302 Stainless Steel Common Trade NamesAnnealed 302 stainless steel is known by numerous names, some of the more common labels, include:

UNS S30200
ASTM A666
AISI 302/304
AMS 5513
AMS 5515
AMS 5516
QQ-S-766
SAE J230

Heat Treating AISI 302 Stainless SteelHeat treatments are used to alter the physical and mechanical properties of metal without changing its shape. They are essential processes in metal manufacturing which increase desirable characteristic of metal, while allowing for further processing to take place.AISI 302 stainless steel is delivered in pre-tempered condition, and, no further hardening can be achieved through heat treating. As needed, completed flat springs and sheet metal stampings can undergo a stress-relieving process.The Annealing ProcessAnnealing AISI 302 involves heating steel to a specified temperature and then cooling at a very slow and controlled rate. Annealing is commonly used to:

Soften a metal for cold working
Improve machinability
Enhance electrical conductivity

Grade	SS302/12Cr18Ni9
Chemical Composition(%)	C: ≤0.15 Mn: ≤2.00 Si: ≤1.00 P: ≤0.035 S: ≤0.030 Ni: ≤8.00-10.00 Cr: ≤17.00-19.00
Mechanical Property	Yield Strength(MPa): ≥205 Tensile Sstrength(MPa): ≥520 Elongation(%): ≥40 Hardness(Hv): ≤92

Annealing also restores ductility. During cold working, the metal can become hardened to the extent that any more work will result in cracking. By annealing the metal beforehand, cold working can take place without any risk of cracking, as annealing releases mechanical stresses produced during machining or grinding.

stainless steel plate sheet06