Grade 304 is the standard "18/8" stainless; it is the most versatile and most widely used stainless steel, available in a wider range of products, forms and finishes than any other. It has excellent forming and welding characteristics.

Description

Grade 304 is the standard "18/8" stainless; it is the most versatile and most widely used stainless steel, available in a wider range of products, forms and finishes than any other. It has excellent forming and welding characteristics. The balanced austenitic structure of Grade 304 enables it to be severely deep drawn without intermediate annealing, which has made this grade dominant in the manufacture of drawn stainless parts such as sinks, hollow-ware and saucepans. For these applications it is common to use special "304DDQ" (Deep Drawing Quality) variants. Grade 304 is readily brake or roll formed into a variety of components for applications in the industrial, architectural, and transportation fields. Grade 304 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.

Application

Food processing equipment, particularly in beer brewing, milk processing & wine making;Kitchen benches, sinks, troughs, equipment and appliances;Architectural panelling, railings & trim;Chemical containers, including for transport;Heat Exchangers;Woven or welded screens for mining, quarrying & water filtration;Threaded fasteners;Springs

parameter

Chemical Composition (%)

C	P	S	Mn	Si	Cr	Ni	Fe
≤
0.08	0.045	0.03	2.0	1.0	17.5-20	8-11	Balance

Physical Property

Density(kg/m3)		8000
Elastic Modulus(GPa)		193
Mean Co-eff of Thermal Expansion (μm/m/℃)	0-100℃	17.2
	0-315℃	17.8
	0-538℃	18.4
Thermal Conductivity (W/m.K)	At 100℃	16.2
	At 500℃	21.5
Specific Heat 0-100℃(J/kg.K)		500
Elec Resistivity(nΩ.m)		720

Mechanical Property

Tensile Strength (MPa) min		515
Yield Strength 0.2%Proof (MPa) min		205
Elongation (% in 50mm) min		40
Hardness	Rockwell B (HRB) max	92
	Brinell (HB) max	201

Corrosion Resistance

Excellent in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C.

Heat Resistance

Good oxidation resistance in intermittent service to 870°C and in continuous service to 925°C. Continuous use of 304 in the 425-860°C range is not recommended if subsequent aqueous corrosion resistance is important. Grade 304L is more resistant to carbide precipitation and can be heated into the above temperature range.

Heat Treatment

Solution Treatment (Annealing) - Heat to 1010-1120°C and cool rapidly. These grades cannot be hardened by thermal treatment.

Welding

Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 304 with Grade 308 and 304L with 308L rods or electrodes (and with their high silicon equivalents). Heavy welded sections in Grade 304 may require post-weld annealing for maximum corrosion resistance. This is not required for Grade 304L. Grade 321 may also be used as an alternative to 304 if heavy section welding is required and post-weld heat treatment is not possible.

Size Range

1. Sheet---Thickness 0.10mm~0.50mm,width10.0~210.0mm, Condition:cold rolled,bright
2. Plate---Thickness 3.5~40.0mm,width≤300mm, Condition:cold rolled,hot rolled
3. Bar---Dia 8.0mm~Dia 32.0mm,length≤2000mm, Condition:hot rolled,burnished Dia 32.0mm~Dia 150.0mm,length:≤1000mm, Condition:hot forging,peeled,turned