China Austenitic stainless steel 302 Weldability

Posted:2015-11-30 03:41:56

Austenitic Cr-Ni stainless steel 302 . More corrosion resistant than Type 301 and because of higher Ni content does not work harden as quickly as Type 301. Essentially non-magnetic in annealed condition, slightly magnetic in cold worked condition.

302 Chemical composition(%):

	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

302 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

Hot working requires uniform heating to 1149°C (2100°F) while cold working helps to increase the hardness of this material. Grade 302 is quite ductile and can be readily drawn, spun and upset. Cold working causes this alloy to gain magnetic properties, and hence post-fabrication annealing is required to recover maximum corrosion resistance and a non-magnetic condition. Annealing is performed between 1010 and 1121°C (1850 and 2050°F) with fast cooling so as to avoid precipitation of chromium carbides.

302 Weldability :

Welding grade 302, it is recommended that by resistance or shielded fusion methods. The filler metals to be used are AWS E/ER308 or 312. Post weld annealing is performed when the chromium carbide needs to be dissolved so as to provide maximum resistance to inter-granular attack. Forging is ideally performed at these temperatures - 1149-1260°C (2100-2300°F). It is advisable not to forge below 927°C (1700°F). Forgings should be fully annealed after all operations, post weld annealing dissolves the chromium carbide and is recommended for maximum resistance to intergranular attack.

302 Application:

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

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