UNS S30200 / 302 Stainless Steel

Parameter

Bozhong Stainless inventory now includes Alloy 302 (UNS S30200) in sheet, sheet coil, plate, round bar, processed flat bar and tubular products.

General Properties

Alloy 302 is a variations of the 18% chromium / 8% nickel austenitic alloy, which is the most familiar and the most frequently used in the stainless steel family. Alloy 302 is a slightly higher carbon version of 304, often found in strip and wire forms. It is a tough, ductile grade that demonstrates comparable corrosion resistance, is non-magnetic, and is not hardenable by heat treatment. Alloy 302 is usually used in its annealed condition and has a high ease of fabrication and formability.

Specifications: UNS S30200

Standards:

ASTM/ASME: UNS S30200

EURONORM: FeMi35Cr20Cu4Mo2

Chemical Properties:

	C	Mn	Si	P	S	Cr	Ni	N
302	max: 0.15	max:2.0	max: 0.75	max: 0.045	max: 0.03	min: 17.0 max: 19.0	min: 8.0 max: 10.0	max: 0.10

Mechanical Properties:

Grade	Tensile Strength ksi (min)	Yield Strength 0.2% ksi (min)	Elongation %	Hardness (Rockwell B) MAX
302	75	30	40	92

Physical Properties:

Density lbm/in3	Thermal Conductivity (BTU/h ft. °F)	Electrical Resistivity (in x 10-6)	Modulus of Elasticity (psi x 106	Coefficient of Thermal Expansion (in/in)/ °F x 10-6	Specific Heat (BTU/lb/ °F)	Melting Range (°F)
at 68°F: 0.285	9.4 at 212°F	72.0 at 70°F	28	9.6 at 32 – 212°F	0.1200 at 32°F to 212°F	2500 to 2590
	12.4 at 932 °F			10.2 at 32 – 1000°F
				10.4 at 32 – 1500°F

Corrosion Resistance

1、Provides useful resistance to corrosion on a wide range of moderately oxidizing to moderately reducing environments

2、The 18 -19% of chromium which this alloy contains provides resistance to oxidizing environments such as dilute nitric acid.

3、Resistant to moderately aggressive organic acids such as acetic, and reducing acids such as phosphoric.

4、’The 9-11% of nickel contained in this alloy provides resistance to moderately reducing environments.

Machinability

Slow speeds and high feeds will overcome this alloy’s tendency to work-harden

Due to gummy chips, it is recommended that chip breakers are used on all tooling

Weldability

Can best be welded by resistance or shielded fusion methods

Post weld annealing dissolves the chromium carbide and is recommended for maximum resistance to intergranular attack

Hot Working

Uniform heating to 2100oF will allow this allow to be forged, upset and headed successfully

Do not work below 1700oF

Cold Working

Will dramatically increase the hardness of this material; however, it is quite ductile and may readily be drawn, spun and upset

Causes alloy 302 to become magnetic

Post-fabrication annealing is necessary to retain maximum corrosion resistance and a non-magnetic condition

Applications:

Applications:

Although many applications have shifted to 304 and 304L due to advances in melting technology, availability, and cost, Alloy 302 is still used in a variety of industries. Some examples include:

Stamping
Spinning
Wire forming
Formed into all types of washers, springs, screens, and cables
Food and beverage industry
Pressure containing applications
Sanitary or cryogenic applications

Some examples of products that are partially or completely constructed of 302 include:

Blenders
Counters
Dish racks
Dishwashers
Refrigerators
Washing machines

Products