Sandvik 3R65 is a molybdenum-alloyed austenitic stainless chromium-nickel steel with a low carbon content. The grade is characterized by:
- Good resistance to general corrosion and better resistance to pitting than ASTM TP304, because of the alloying with molybdenum (Mo).
- High tensile strength
Sandvik 3R65 is used for medical tools.
ASTM: TP316L, TP316
UNS: S31603, S31600
EN Number: 1.4404, 1.4401
EN Name: X2CrNiMo17-12-2, X5CrNiMo17-12-2
W.Nr.: 1.4404, 1.4401
DIN: X 2 CrNiMo 17 13 2, X 5 CrNiMo 17 12 2
AFNOR: Z 2 CND 17.12, Z 6 CND 17.11
- ASTM F899, A213, A269, A312
- ISO 16061
- EN 10216-5
- BS 3605, BS 3606
- DIN 17456, 17458
- NFA 49-117, 49-217
- SS 14 23 48
Chemical composition (nominal)
Thick wall tubes applications:
Sandvik 3R65 is used in a wide variety of industrial applications. For the medical industry, Sandvik 3R65 is used for medical tools.
Thin wall tubes applications:
Biopsy punches, mammography machine, brooches, suspension for oxygen tank for hospital mobile beds, surgical and dental tools.
Sandvik 3R65 has good resistance to:
- Organic acids at high concentrations and temperatures, with the exception of formic acid and acids with corrosive contaminants
- Inorganic acids, e.g. phosphoric acid, at moderate concentrations and temperatures, and sulfuric acid below 20% at moderate temperatures. The steel can also be used in sulfuric acid of concentrations above 90% at low temperature
- Salt solutions, e.g. sulfates, sulfides and sulfites
Sandvik 3R65 has a low carbon content and therefore better resistance to intergranular corrosion than other steels of type ASTM 316.
Pitting and crevice corrosion
Resistance of these types of corrosion improves with molybdenum content. Sandvik 3R65 has substantially higher resistance to attack than steels of type ASTM 304.
Stress corrosion cracking
Austenitic steels are susceptible to stress corrosion cracking. Stress corrosion cracking may occur if the steel is simultaneously exposed to the following:
- Tensile stresses
- Certain solutions, particularly those containing chlorides
- Temperatures above 60oC (140oF)
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 a chloride content that leads to both stress corrosion cracking and pitting.
In applications demanding high resistance to stress corrosion cracking, austenitic-ferritic steels, e.g. Sandvik SAF 2304 or Sandvik SAF 2205 are recommended.
Sandvik 3R65 can be used in
- Air up to 850oC (1560oC)
- Steam up to 750oC (1380oF)
In flue gases containing sulfur, the corrosion resistance is reduced. In such environments Sandvik 3R65 can be used at temperatures up to 600-750OC (1110-1380OF) depending on service conditions. Factors to consider are whether the atmosphere is oxidizing or reducing, i.e. the oxygen content, and whether impurities such as sodium and vanadium are present.
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.
Forms of supply
Seamless tube and pipe- Finishes and dimensions
Seamless tube and pipe in Sandvik 3R65 are supplied in dimensions up to 260 mm outside diameter in the solution annealed and white-pickled condition or in the bright-annealed condition.
Dimension range for tubes, thin wall
OD : 0.5 - 50.80 mm
Wall thickness : 0.1 - 3 mm
Fine tube tolerances :
- Wall thickness tolerance : +/- 10%
- OD tolerance : +/- 0.75% with a minimum of +/-0.02 mm
for OD> 5mm Ra (outside) < 0.4 (by polishing)
for ID>3.2mm Ra (inside)< 0.4 - this possibility depends on wall thickness/diameter ratio
Specific roughness can be done on request
- Internal cleaning can not be done for inside diameter below 4 mm
All products supplied either in the annealed and cold worked condition to provide mechanical properties as required
Tubes are delivered in the heat treated condition. If additional heat treatment is needed after further processing the following is recommended.
850-950°C (1560-1740°F), 10-15 minutes, cooling in air.
1000-1100°C (1830-2010°F), 5-20 minutes, rapid cooling in air or water.
Thin wall tubes
Sandvik 3R65 can be supplied in bright annealed or cold worked condition with Rm 860-1100 MPa
Thick wall tubes
For tube and pipe with wall thicknesses greater than 10 mm (0.4 in.) the proof strength may fall short of the stated values by about 10 MPa (1.4 ksi).
At 20°C (68°F)
Mechanical properties can be set according to your demands.
|Tensile strength||Proof strength||Elong.||Hardness|
|Cold worked (min)||≥700||≥101||≥600||≥80||≤18|
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√S0 where L0 is the original gauge length and S0 the original cross-section area.
Due to its austenitic microstructure, Sandvik 3R65 has very good impact strength both at room temperature and at cryogenic temperatures.
Tests have demonstrated that the steel fulfils the requirements (60 J (44 ft-lb) at -196 oC (-320 oF)) according to the European standards EN 13445-2 (UFPV-2) and EN 10216-5.
At high temperatures
|Temperature||Proof strength||Proof strength||Temperature||Proof strength||Proof strength|
Density: 8.0 g/cm3 , 0.29 lb/in3
|Modulus of elasticity||Temp.
|Modulus of elasticity
|°C||W/m °C||J/kg °C||(x103)||°F||Btu/ft h °F||Btu/lb °F||(x103)|
|Temperature, °C||Per °C||Temperature, °F||Per °F|
1) Mean values in temperature ranges (x10-6)
Sandvik 3R65 has good machining properties. However the machining of Sandvik 3R65, as with other stainless steels, requires an adjustment of tooling data and machining method, in order to achieve satisfactory results. Compared to Sanmac 316/316L, the cutting speed must be reduced by approximately 30-40 % when turning Sandvik 3R65 with coated, cemented carbide tools. Much the same applies to other operations.
Feeds should only be reduced slightly and with care.
Detailed recommendations for the choice of tools and cutting data are provided in the brochure S-02909-ENG. Data should be selected as for steel grade Sanmac 316/316L, while taking into account the provisions above.
The weldability of Sandvik 3R65 is good. Welding must be carried out without preheating and subsequent heat treatment is normally not required. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.
For Sandvik 3R65, heat input of <2.0 kJ/mm and interpass temperature of <150°C (300°F) are recommended.
Recommended filler metals
TIG/GTAW or MIG/GMAW welding
ISO 14343 S 19 12 3 L / AWS A5.9 ER316L (e.g. Exaton 19.12.3.L)
ISO 3581 E 19 12 3 L R / AWS A5.4 E316L-17(e.g. Exaton 19.12.3.LR)