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Stainless steel 304,304L,304H
Stainless steel 304,304L,304H
Stainless steel 304,304L,304H
Stainless steel 304,304L,304H

Stainless steel 304,304L,304H

Stainless steel 304 and stainless steel 304L are also known as 1.4301 and 1.4307 respectively. 304 is the most versatile and widely used stainless steel.
Product introduction
Stainless steel 304 and stainless steel 304L are also known as 1.4301 and 1.4307 respectively. 304 is the most versatile and widely used stainless steel. It is still sometimes referred to by its old name 18/8 which is derived from the nominal composition of 304 being 18% chromium and 8% nickel. 304 stainless steel is an austenitic grade that can be severely deep drawn. This property has resulted in 304 being the dominant grade used in applications like sinks and saucepans. 
304L is the low carbon version of 304. It is used in heavy gauge components for improved weldability.  
304H, a high carbon content variant, is also available for use at high temperatures. 
Technical data
Chemical Composition
  C Si Mn P S Ni Cr Mo N
SUS304 0.08 0.75 2.00 0.045 0.030 8.50-10.50 18.00-20.00 0.10
SUS304L 0.030 1.00 2.00 0.045 0.030 9.00-13.00 18.00-20.00
304H 0.030 0.75 2.00 0.045 0.030 8.00-10.50 18.00-20.00 - -

Mechanical Properties
Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50 mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max HV  
304 515 205 40 92 201 210  
304L 485 170 40 92 201 210  
304H 515 205 40 92 201 -  
304H also has a requirement for a grain size of ASTM No 7 or coarser.

Physical Properties
Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100 °C (J/kg.K) Electrical Resistivity (nΩ.m)
0-100 °C 0-315 °C 0-538 °C at 100 °C at 500 °C
304/L/H 8000 193 17.2 17.8 18.4 16.2 21.5 500 720

Approximate grade comparisons for 304 stainless steels
Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
304 S30400 304S31 58E 1.4301 X5CrNi18-10 2332 SUS 304
304L S30403 304S11 - 1.4306 X2CrNi19-11 2352 SUS 304L
304H S30409 304S51 - 1.4948 X6CrNi18-11 - -
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

Possible Alternative Grades
Grade Why it might be chosen instead of 304
301L A higher work hardening rate grade is required for certain roll formed or stretch formed components.
302HQ Lower work hardening rate is needed for cold forging of screws, bolts and rivets.
303 Higher machinability needed, and the lower corrosion resistance, formability and weldability are acceptable.
316 Higher resistance to pitting and crevice corrosion is required, in chloride environments
321 Better resistance to temperatures of around 600-900 °C is needed…321 has higher hot strength.
3CR12 A lower cost is required, and the reduced corrosion resistance and resulting discolouration are acceptable.
430 A lower cost is required, and the reduced corrosion resistance and fabrication characteristics are acceptable.

 
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