Menu

Austenitic SS 304

Austenitic SS 304

ALLOY 304 | S30400 | 1.4301 | X5CRNI18-10 | 304S31 | 08Х18Н10 | SUS 304 | Z7CN18‐09

ALLOY 304L | S30403 | 1.4306 / 1.4307 | X2CRNI18-9 / X2CRNI19-11 | 304S11 | 03Х18Н11 | SUS 304L | Z3CN18‐10

Stainless steels are specifically identified for its excellent corrosion resistance and high ductility. Stainless steels have a minimum of 10.5% Chromium, which forms a protective oxide layer that retains the corrosion resistance of the steel, even after being fabricated.

The ductility is retained by the austenitic structure in the material. TP 304 (Tubular product – grade 304) is one of the most versatile, common and widely used austenitic steel in a wide range of forms and finishes.

It is defined as Chromium- Nickel austenitic alloy. TP 304 has 18% chromium, 8% nickel and a maximum of 0.08% carbon, also known as 18/8 stainless steel because of its composition. The carbon content in this grade prevents the alloy from getting brittle. The grade has brilliant processing capabilities. It can be deep drawn without the need of intermediate annealing, it can be formed to variety of components for industrial, constructional and architectural requirements. The types in the given alloy grade are 304 L and 304 H.

Type 304 L is probably the world’s most common stainless steel, due to its easy processing and availability. The alloy has a carbon content of 0.035%, which makes it extremely ductile. Furthermore, it does not require to be heat treated after welding for removal of post welding stresses and hence can be used in heavy gauge components.

Type 304 H has higher carbon content of about 0.04- 0.10 %, which makes it a grade bearing diverse applications at elevated temperatures. Both the grades have good machinability and weldability and does not require additional filler metal. They have a combination of low yield strength and high elongation and hence they can be successfully made into complicated shapes.

  • Chemical properties
  • Physical properties
  • General data
  • Standards Specifications
  • Forms of Supply
  • Corrosion Resistance
  • Heat Treatment
  • Weldability
  • Machining
  • Applications
  • Possible grade alternatives
Grade   Ni C Cr Mn Si P Fe S N
304 Min. 8.00 - 18.00 - - - - - -
Max. 10.50 0.08 20.00 2.00 0.75 0.045 BAL. 0.030 0.10
304L Min. 8.00 - 18.00 - - - - - -
Max. 10.50 0.08 20.00 2.00 0.75 0.045 BAL. 0.030 0.10
Density 0.285 lbs / in3/7.90 g /cm3
Melting Point 2550 – 2590°F/1398 – 1421°C
Specific Heat @ 70°F 0.12 BTU/lb-°F (32 – 212°F)
500 J/kg-°K (0 –100°C)
Thermal Conductivity @ 70°F 9.4 BTU/hr/ft2/ft/°F
16.3 W/m-°K
Elastic Modulus @ 70ºF (tension) 29.0 x 106 psi
200 GPa
Electrical Resistivity @ 70°F 29.1 Microhm-in at 68°F
73 Microhm-cm at 20°C
Annealing 1652 – 2102°F (750 – 1150°C)
Standard SS 304 SS 304L
UNS S30400 S30403
WERKSTOFF NR. 1.4301 1.4306/1.4307
EN X5CrNi18-10 X2CrNi18-9 / X2CrNi19-11
BS 304S31 304S11
GOST 304S31 03Х18Н11
JIS SUS 304 SUS 304L
Pipes & Tubes
Summary Standards
Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes ASTM A213
Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes ASTM A249
Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service ASTM A269
Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes ASTM A312
Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications ASTM A409
Standard Specification For Seamless Stainless Steel Mechanical Tubing ASTM A511
Fittings & Flanges
Summary Standards
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service ASTM A182
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings ASTM A403

Piping and tube, fittings and flanges, washers.

Resistant to a wide range of atmospheres in chemical, textile, food and petroleum industries. It is resistant to potable water with up to about 200 mg/L chlorides at normal temperatures, and reducing to about 150 mg/L at 60 °C.

Type 304 is non-hardenable by heat treatment. It is annealed to about 1100 deg. Celsius and then air cooled if thin sections or water quenched for heavy parts.

Excellent weldability in all forms of the grade. They are generally known to be weldable by vommon fusion and resistance techniques. The 304 L grade doesn’t require any post-welding annealing but the heavy welded sections in the grade 304 might require.

Excellent machining, higher machining rates, lower tool wear rates.

  • Food processing equipment
  • Dairy equipment like milking machines, homogenizers, sterilizers
  • Pressure vessels
  • Heat exchangers used in turbines
  • Brewing industry which includes pipelines, fermentation vats, storage and railway cars
  • Domestic tool industry used in coffee urns, table tops, stoves, refrigerators
  • Architectural panelling and railing
Grades - 301 L
Grade   Ni C Cr Mn Si P S N
301L Min. 6.0 - 16.0 - - - - -
Max. 8.0 0.03 18.0 2.00 1.0 0.045 0.030 0.20
Grade - 302 HQ
Grade   Ni C Cr Mn Si P S N
302 HQ Min. 8.0 - 17.0 - - - - 3.0
Max. 10.0 0.03 19.0 2.00 1.0 0.045 0.030 4.0
Grade - 303
Grade   Ni C Cr Mn Si P S
303 Min. 8.0 - 17.0 - - - -
Max. 10.0 0.15 19.0 2.00 1.0 0.20 0.15
Grade - 316
Grade   Ni C Cr Mn Si P Mo S N
316 Min. 10.0 - 16.0 - - - 2.00 - -
Max. 14.0 0.08 18.0 2.00 0.075 0.045 3.00 0.03 0.10
Grade - 321
Grade   Ni C Cr Mn Si P Ti S N Fe
321 Min. 9.0 - 17.0 - - - - - - 65.045
Max. 12.0 0.08 19.0 2.00 1.0 0.045 5(C+N) -0.70 0.030 0.10 -

Product Enquiry