Alleima® 3R12 for medical applications Tube and pipe, seamless

Datasheet updated

2022-08-29 18:56
(supersedes all previous editions)

Alleima® 3R12 is an austenitic stainless chromium-nickel steel with a low carbon content used for medical and dental instruments. The grade is characterized by:

  • Good corrosion resistance
  • Excellent toughness
  • Good welding properties

Standards

  • ASTM: TP304, TP304L
  • UNS: S30400, S30403
  • EN Number: 1.4301, 1.4306
  • W.Nr.: 1.4301, 1.4306
  • DIN: X5 CrNi 18 10, X2CrNi 19 11
  • SS: 2333, 2352
  • AFNOR: Z 2 CN 18.10
  • BS: 304S11, 304S31
  • JIS: SUS304L, SUS304LTB, SUS304TP

Product standards

  • ASTM F899, A213, A269, A312
  • ISO 16061
  • JIS G3459, G3463
  • EN 10216-5
  • BS 3605, 3606
  • DIN 17456, 17458
  • NFA 49-117, 49-217
  • SS 14 23 52, 14 23 33

Approval

JIS approval for Stainless Steel Tubes

Chemical composition (nominal)

Chemical composition (nominal) %
C Si Mn P S Cr Ni
≤0.030 0.5 1.3 ≤0.030 ≤0.015 18.5 10

Subject to agreement, material with extra low Co content can be supplied.

Chemical composition (nominal) %

C Si Mn P S Cr Ni
≤0.030 0.5 1.3 ≤0.030 ≤0.015 18.5 10

Subject to agreement, material with extra low Co content can be supplied.

Applications

Thick wall tubes applications :

Alleima® 3R12 is used for medical and dental tools.

Thin wall tubes applications :

Alleima® 3R12 can be used for biopsy punches, mammography machine, brooches, suspension for oxygen tank for hospital mobile beds, surgical and dental tools.

Corrosion resistance

General corrosion

Alleima® Bioline 3R12 has good resistance in

  • Organic acids at moderate temperatures
  • Salt solutions, e.g. sulfates, sulphides and sulphites.
  • Caustic solutions at moderate temperatures

Alleima® Bioline 3R12 has better resistance than normal type AISI 304 to oxidizing agents, such as nitric acid. Figure 1 shows iso- corrosion in nitric acid for Alleima® Bioline 3R12.

Figure 1. Diagram showing iso- corrosion in nitric acid for Alleima Bioline 3R12 at the corrosion rates of 0.1 mm/year (4mpy) and 0.3 mm/year (12 mpy).

Intergranular corrosion

Alleima® Bioline 3R12 has a low carbon content and therefore better resistance to intergranular corrosion than steels of type AISI 304.

The TTC-diagram, Figure 2, which shows the result of testing for 24 hour in boiling Strauss solution (12% sulfuric acid, 6% copper sulphate) confirms the superior resistance of Alleima Bioline 3R12. This is an advantage in complicated welding operations.

The good resistance against intergranular attack of Alleima® Bioline 3R12 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 sensitized (675°C) condition can be met.

Alleima® Bioline 3R12 with its controlled and low impurity level, shows better results than ordinary AISI 304L or 321.

3R12-fig-3-rev 1.png

Figure 2. TTC-diagram for Alleima® Bioline 3R12 (AISI 304L) and AISI 304.

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 SAF 2304.

Gas corrosion

Alleima® Bioline 3R12 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 behavior 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 oxidizing or reducing, i.e. the oxygen content, and whether impurities such as sodium and vanadium are present.

Bending

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

Dimension range for tubes, thick wall

Seamless tube and pipe in Alleima® 3R12 is supplied in dimensions up to 260 mm outside diameter in the solution annealed and white-pickled condition or solution annealed in a bright-annealing process.

U-tubes can be delivered on request.

Alleima 3R12 is stocked in a wide range of sizes according to ISO and ANSI.
Details of our manufacturing and stock programme are given in catalogue S-110-ENG.

Dimension range for tubes, thin wall

OD : 0.5 - 50.80 mm
thickness : 0.1 - 3 mm
Fine tube tolerances :

  • Thickness tolerance : +/- 10%
  • OD tolerance : +/- 0.75% with a minimum of +/-0.02 mm
  • Roughness
    for OD> 5mm Ra (outside) < 0.4 (by polishing)
    for ID>3.2mm Ra (inside)< 0.4 - this possibility depends on 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

Heat treatment

The tubes are normally delivered in heat treated condition. If additional heat treatment is needed after further processing the following is recommended.

Stress relieving

850-950°C (1560-1740°F), cooling in air.

Solution annealing

1000-1100°C (1830-2010°F), rapid cooling in air or water.

Mechanical properties

Thin wall tubes

Alleima® 3R12 can be supplied in bright annealed or cold worked condition with a Rm : 860-1100 MPa

Thick wall tubes

For tube and pipe with wall thickness greater than 10 mm (0.4 in.) the proof strength may fall short of the stated value 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
Rm Rp0.2a Rp1.0a Ab A2-
MPa ksi MPa ksi MPa ksi % % HRB
Annealed 515-660 75-100 ≥210 ≥30 ≥40 ≥35 ≥45 ≥35 ≤90
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 ÖS0 where L0 is the original gauge length and S0 the original cross-section area.

Impact strength

Due to its austenitic microstructure, Alleima® 3R12 has very good impact strength both at room temperature and at cryogenic temperatures.

Tests have demonstrated that the steel fulfils the requirements according to the European standards EN 13445-2 (UFPV-2) ( (min. 60 J (44 ft-lb) at -270 oC (-455 oF)) and EN 10216-5 (min. 60 J (44 ft-lb) at -196 oC (-320oF).

At high temperatures

Metric units
Temperature Proof strength
°C Rp0.2 Rp1.0
MPa MPa
min. min.
50 190 215
100 165 190
150 150 175
200 140 165
250 130 155
300 125 150
350 120 145
400 115 140
450 110 135
500 105 130
550 100 125
600 95 120
Imperial units
Temperature Proof strength
°F Rp0.2 Rp1.0
ksi ksi
min. min.
200 24 28
400 20 24
600 18 22
800 16 20
1000 15 18
Creep strength
Temperature, Creep-rupture strength (ISO- values)
°C °F 10 000 h 100 000 h
MPA ksi MPa ksi
approx. approx. approx. approx.
550 1020 195 28.3 115 16.6
575 1065 147 21.3 93 13.5
600 1110 122 17.6 74 10.7
625 1155 100 14.5 58 8.4
650 1200 79 11.5 45 6.5
675 1245 64 9.2 33 4.8
700 1290 48 7.0 23 3.3

Physical properties

Density: 7.9 g/cm3, 0.29 lb/in3

Thermal conductivity
Temperature
°C °F W/m °C Btu/ft h °F
20 68 15 8.5
100 200 16 9.5
200 400 18 10.5
300 600 20 12
400 800 22 13
500 1000 23 14
600 1200 25 15
700 1300 26 15
Specific heat capacity
Temperature
°C °F J/kg °C Btu/lb °F
20 68 475 0.11
100 200 500 0.12
200 400 530 0.13
300 600 560 0.13
400 800 580 0.14
500 1000 600 0.14
600 1200 615 0.15
700 1300 625 0.15
Thermal expansion 1)
Temperature, °C Per °C Temperature, °F Per °F
30-100 16.5 86-200 9
30-200 17 86-400 9.5
30-300 17.5 86-600 10
30-400 18 86-800 10
30-500 18.5 86-1000 10
30-600 18.5 86-1200 10.5
30-700 19 86-1400 10.5

1) Mean values in temperature ranges (x10-6)

Modulus of elasticity
Temperature
°C °F MPa ksi
20 68 200 29.0
100 200 194 28.2
200 400 186 26.9
300 600 179 25.8
400 800 172 24.7
500 1000 165 23.5

Welding

The weldability of Alleima® 3R12 for medical application is good. Welding must be carried out without preheating and subsequent heat treatment is normally not required. Suitable methods of fusion welding are gas-shielded arc welding TIG/GTAW and MIG/GMAW, with the TIG/GTAW method as first choice.

For Alleima® 3R12, 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 9 L / AWS A5.9 ER308L (e.g. Exaton 19.9.L)

Disclaimer: Alleima is not providing any products or services that are intended or may be construed to be recommending or otherwise advising on, in any manner, the design, suitability, appropriateness or effectiveness, from a medical/biological/safety perspective, of any medical material, instrument and/or medical device.