302 Stainless Steel Sheet, Coil & Plate - AMS 5516, UNS S30200

Inventory Size Ranges for 302

Type	Thickness	AMS Standards	ASTM	UNS	ASME	Get a Quote
Coil	0.010" - 0.125"	AMS 5516	ASTM A 666, ASTM A 240	UNS S30200	ASME SA 240, ASME SA 666	Get a Quote
Sheet	0.010" - 0.125"	AMS 5516	ASTM A 666, ASTM A 240	UNS S30200	ASME SA 240, ASME SA 666	Get a Quote
Precision Reroll Strip	0.0008" - 0.015"					Get a Quote

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Characteristics of 302

302 stainless steel provides useful resistance to corrosion on a wide range of moderately oxidizing to moderately reducing environments. The main features of this alloy include is prevention of product contamination, its resistance to oxidation, its ease of fabrication and cleaning, as well as its high strength and low weight. 302 material is readily available with a wide range of product forms and sizing to choose from.

Working with 302

This alloy is susceptible to stress corrosion cracking (SCC) in halides due to its relatively low nickel content. Conditions which cause SCC are: (1) presence of halide ions (generally chloride), (2) residual tensile stresses, and (3) temperatures in excess of about 120°F (49°C). Stresses may result from cold deformation of the alloy during forming, or by roller expanding tubes into tubesheets, or by welding operations which produce stresses from the thermal cycles used. Stress levels may be reduced by annealing or stress relieving heat treatments following cold deformation, thereby reducing sensitivity to halide SCC. 

The austenitic stainless steels are heat treated to remove the effects of cold forming or to dissolve precipitated chromium carbides. The surest heat treatment to accomplish both requirements is the solution anneal which is conducted in the 1850°F to 2050°F range (1010°C to 1121°C). Cooling from the anneal temperature should be at sufficiently high rates through 1500-800°F (816°C – 427°C) to avoid reprecipitation of chromium carbides. These materials cannot be hardened by heat treatment. 

The austenitic stainless steels are considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes. Two important considerations in producing weld joints in the austenitic stainless steels are: 1) preservation of corrosion resistance, and 2) avoidance of cracking. A temperature gradient is produced in the material being welded which ranges from above the melting temperature in the molten pool to ambient temperature at some distance from the weld. The higher the carbon level of the material being welded, the greater the likelihood that the welding thermal cycle will result in the chromium carbide precipitation which is detrimental to corrosion resistance. Weld metal with a fully austenitic structure is more susceptible to cracking during the welding operation. For this reason, 302 is designed to resolidify with a small amount of ferrite to minimize cracking susceptibility. If filler metal is required, ATI 308 (20% Cr-11% Ni) alloy is generally used. This enriched composition avoids martensite which might otherwise form in multipass welds. Chemistry is controlled to allow a small amount of ferrite in the deposit to limit hot cracking tendency.