Sandvik 304L (Plate and sheet)
Datasheet updated 2012-11-20 17:01:58 (supersedes all previous editions)
Sandvik 304L is an austenitic chromium-nickel steel with a low carbon content.
- ASTM TP304L
- UNS S30403
- EN number 1.4306*
- W.Nr. 1.4306
- DIN X 2 CrNi 19 11
- SS 2352
- AFNOR Z 2 CN 18.10
- BS 304S11
- JIS SUS304L
ASTM A240, A480
* Valid for sheet/plate, strip, semifinished products, bars, rods and sections for general purposes (not for pressure purposes).
Chemical composition (nominal) %
Subject to agreement, material with extra low Co content can be supplied.
Forms of supply-finishes and dimensions
Plate & sheet
Plate & sheet are delivered in the solution annealed and pickled condition.
Sheet may be supplied as annealed and pickled, polished or in the bright-annealed condition
The size ranges available are given below in Sizes in stock section.
|Proof strength||Tensile Strength||Elong.|
1 MPa = 1 N/mm2
a) Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength, respectively.
b) Based on L0 = 5.65 ÖS0 where L0 is the original gauge length and S0 the original cross-section area.
The hardness 201(Brinell) 92 (Rockwell B)
The impact strength (Charpy V) at -60 °C (-75 °F) is min. 150 J (110 ft-lb).
At high temperatures
|°C||°F||10 000 h||(ISO-values)||100 000 h|
|Temperature °C||W/m °C||Temperature °F||Btu/ft h °F|
|Temperature, °C||J/kg °C||Temperature, °F||Btu/lb °F|
|Temperature °C||Per °C||Temperature °F||Per °F|
1) Mean values in temperature ranges (x10-6)
|Temperature, °C||MPa||Temperature, °F||ksi|
Sandvik 304L has good resistance in
- Organic acids at moderate temperatures
- Salt solutions, e.g. sulphates, sulphides and sulphites.
- Caustic solutions at moderate temperatures
Sandvik 304L has better resistance than normal type AISI 304 to oxidising agents, such as nitric acid. Figure 2 shows isocorrosion in nitric acid for Sandvik 304L.
Sandvik 304L has a low carbon content and therefore better resistance to intergranular corrosion than steels of type AISI 304.
The TTC-diagram, Figure 3, which shows the result of testing for 24 hour in boiling Strauss solution (12% sulphuric acid, 6% copper sulphate) confirms the superior resistance of Sandvik 304L. This is an advantage in complicated welding operations.
The good resistance against intergranular attack of Sandvik 304L is also demonstrated in the Huey test (boiling in 65% nitric acid for 5x48h). A maximum corrosion rate of 0.40 mm/year in the annealed condition and 0.60 mm/year in the sensitised (675°C) condition can be met.
Sandvik 304L with its controlled and low impurity level, shows better results than ordinary AISI 304 or 321.
Pitting and crevice corrosion
The steel may be sensitive to pitting and crevice corrosion even in solutions of relatively low chloride content. Molybdenum-alloyed steels have better resistance improves with increasing molybdenum content.
Stress corrosion cracking
Austenitic steels are susceptible to stress corrosion cracking. This may occur at temperatures above about 60°C (140°F) if the steel is subjected to tensile stresses and at the same time comes into contact with certain solutions, particularly those containing chlorides. Such service conditions should therefore be avoided. Conditions when plants are shut down must also be considered, as the condensates which are then formed can develop conditions that leads to both stress corrosion cracking and pitting.
In applications demanding high resistance to stress corrosion cracking we recommend the austenitic-ferritic steel Sandvik SAF 2304. See data sheet S-1871-ENG.
Sandvik 304L can be used in
- Air up to 850°C (1560°F)
- Steam up to 750°C (1380°F)
- Synthesis gas (ammonia synthesis) up to about 550°C (1020°F).
Creep behaviour should also be taken into account when using the steel in the creep range.
In flue gases containing sulphur, the corrosion resistance is reduced. In such environments the steel can be used at temperatures up to 600-750°C (1110-1380°F) depending on service conditions. Factors to consider are whether the atmosphere is oxidising or reducing, i.e. the oxygen content, and whether impurities such as sodium and vanadium are present.
Plates are normally delivered in heat treated condition. If additional heat treatment is needed after further processing the following is recommended.
850-950°C (1560-1740°F), cooling in air.
1000-1100°C (1830-2010°F), rapid cooling in air or water.
The weldability of Sandvik 304L is good. Suitable welding methods are manual metal-arc welding with covered electrodes and gas-shielded arc welding with the TIG and MIG methods as first choice. Preheating and post-weld heat treatment are not normally necessary.
Since the material has low thermal conductivity and high thermal expansion, welding must be carried out with a low heat input and with welding plans well thought out in advance so that the deformation of the welded joint can be kept under control. If, despite these precautions, it is foreseen that the residual stresses might impair the function of the weldment, we recommend that the entire structure be stress relieved. See under Heat treatment.
As filler material for gas-shielded arc welding we recommend wire electrodes and rods Sandvik 19.9.L or 19.9.LSi. In manual metal-arc welding covered electrodes Sandvik 19.9.LR or 19.9.LRHD are recommended. If flux cored arc welding is preferred, electrodes Sandvik 19.9.LT or 19.9.LVT should be used.
Annealing after cold bending is not normally necessary, but this point must be decided with regard to the degree of bending and the operating conditions. Heat treatment, if any, should take the form of stress relieving or solution annealing, see under heat treatment.
Hot bending is carried out at 1100-850°C (2010-1560°F) and should be followed by solution annealing.
Sandvik 304L is used for a wide range of industrial applications. Typical examples are: Tanks and reactors in the chemical, petrochemical, fertilizer, pulp and paper and nuclear power industries, as well as in the production of pharmaceuticals, foods and beverages.
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Sandvik materials.