304

HuaNickel 304 is used as a building material up to 1500°F. Slight zooming starts at about 1200°F. 304 has a minimum carbon content of 0.04% and a particle size of ASTM 7 or coarse. It has general corrosion resistance similar to mild steel HuaNickel 304. However, there is carbide precipitation in the heat-affected zone (HAZ) of the weld. Weldments may be susceptible to HAZ intergranular corrosion and polysulfuric acid stress corrosion cracking in oxidizing acid environments. Carbide precipitation is harmless to high temperature mechanical properties. 30422Cr 11Ni filler wire (ER308) or overlay electrode (E308) for welding. Most hot jobs do not require post-weld heat treatment.

304 Chemical composition：

	Cr	Ni	C	Mn	Si	P	S	Fe
Min	18	8	0.04	–	–	–	–	Bal
Max	20	10.5	0.08	2	0.75	0.04	0.03

304Physical properties：

Density	Melting point	Resistivity
0.285 lb/in3	2550 – 2590°F	28.3 micro ohm- in

304Mechanical properties：

	least	typical
Ultimate tensile strength, ksi	75	90
0.2% yield strength, KSI 30 40	30	40
Elongation, %	40	60

304Stainless steel characteristics：

High temperature service is raised to 1500°F

Corrosion resistance, similar to 304/304L

304Uses of stainless steel：

Pressure vessels

Petrochemical equipment

Relevant standards：

ASTM: A 240 ASME: SA-240 AMS: 5513