Alleima® 3R64 Tube and pipe, seamless

Datasheet updated

2022-06-30 11:58
(supersedes all previous editions)

Alleima® 3R64 is an austenitic stainless steel with a high molybdenum content. The grade is characterized by improved resistance to general and pitting corrosion in comparison with ASTM 316L.

Standards

  • ASTM: TP317L
  • UNS: S31703
  • SS: 2367

Product standards
Seamless tube and pipe

ASTM A213, A312
SS 142367

Chemical composition (nominal)

Chemical composition (nominal) %
C Si Mn P S Cr Ni Mo
≤0.030 0.4 1.7 ≤0.030 ≤0.015 18.5 14.5 3.1

Chemical composition (nominal) %

C Si Mn P S Cr Ni Mo
≤0.030 0.4 1.7 ≤0.030 ≤0.015 18.5 14.5 3.1

Applications

Alleima® 3R64 can be used for a wide range of industrial applications where steels of type ASTM 304 and 304L or even ASTM 316L have insufficient corrosion resistance. Typical examples are heat exchangers, condensers, pipelines, cooling and heating coils in the chemical, petrochemical, pulp and paper and food industries.

Corrosion resistance

Owing to its high molybdenum content Alleima® 3R64 possesses improved resistance compared to ASTM 316/316L in a majority of chloride and acidic environments.

General corrosion

Alleima® 3R64 has good resistance in:

  • Organic acids at high concentrations and moderate temperatures
  • Inorganic acids, e.g. phosphoric and sulphuric acids at moderate concentrations and temperatures. The steel can also be used in sulphuric acid of concentrations above 90% at low temperature
  • Salt solutions, e.g. sulphates, sulphides and sulphites caustic environments

The following data illustrate the improved resistance of Alleima® 3R64 vs ASTM 316, although the corrosion rates at the majority of temperatures are unacceptably high for both grades.

Table 1. General corrosion resistance of Alleima® 3R64 and ASTM 316 in boiling formic acid.

Formic acid, wt-%
Corrosion rate, mm/year
Alleima 3R64 ASTM 316
5 0.12 0.18
10 0.20 0.3
25 0.35 0.6
50 0.45 0.6
80 1.0 1.5
90 0.8 1.8
100
0.4
0.6

Intergranular corrosion

Owing to its low carbon content Alleima® 3R64 possesses a low risk for intergranular corrosion after e.g. welding operations.

Pitting and crevice corrosion

The pitting corrosion resistance of stainless steels is primarily determined by the contents chromium, molybdenum and nitrogen. The Pitting Resistance Equivalent can be used for ranking different stainless steels with regard to their pitting resistance. The PRE number is defined as:
PRE = % Cr + 3.3 x % Mo + 16 x % N

Table 2. PRE values for Alleima® 3R64 and some other alloys. Typical values unless otherwise stated

Alloy 3R64 ASTM 316L1) Alloy 825 904L SAF 2205
PRE 29 24 31 34 >35

1) 2.1 % Mo

Thus Alleima® 3R64 is resistant against pitting corrosion at higher temperatures and/or higher chloride concentrations than is the case for ASTM 316L.

Figure 1. Crevice corrosion resistance of Alleima® 3R64 and 3R60.

The same ranking of alloys can be applied for the crevice corrosion resistance. However, crevice corrosion is to be expected at significantly lower temperatures, than is the case for pitting corrosion. Figure 1 demonstrates the better crevice corrosion resistance of Alleima® 3R64 vs. 3R60 (ASTM 316L with 2.6% Mo, EN 1.4435) after 2 months exposure in chloride solutions.

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 a chloride content that leads to both stress corrosion cracking and pitting.

In applications demanding high resistance to stress corrosion cracking, austenitic-ferritic steels, such as SAF 2304 or SAF 2205 are recommended. See data sheets S-1871-ENG or S-1874-ENG.

Forms of supply

Seamless tube and pipe

Seamless tube and pipe in Alleima® 3R64 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.

Other forms of supply

Alleima® 3R64 is also supplied in forms of:

  • Welded tube and pipe
  • Fittings and flanges

Further details concerning sizes and finishes are available on request.

Heat treatment

The tubes are 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), 10-15 min, cooling in air.

Solution annealing

1000–1100°C (1830–2010°F), 10-30 min, cooling in air or water.

Mechanical properties

For tube and pipe with a wall thickness 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)

Metric units
Proof strength Tensile strength Elong. Hardness
Rp0.2a Rp1.0a Rm Ab Vickers
MPa MPa MPa %
approx.
≥220 ≥250 515-690 ≥35 155
Imperial units
Proof strength Tensile strength Elong. Hardness
Rp0.2a Rp1.0a Rm Ab Vickers
ksi ksi ksi %
approx.
≥32 ≥36 75-100 ≥35 155

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® 3R64 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 Rp0.2a Rp1.0a
MPa MPa
min. min.
 50  196  221
 100  172  197
 150  155  180
 200  144  169
 250  136  161
 300  129  154
 350  123  148
 400  119  144
 450  115  140
500 110 135
Imperial units
Temperature Proof strength
°F Rp0.2a Rp1.0a
MPa ksi
min. min.
200 25.4 29.0
400 20.8 24.4
600 18.4 22.1
800 17.0 20.6
1000 15.4 19.0

Physical properties

Density: 8.0 g/cm3, 0.29 lb/in3

Thermal conductivity
Temperature, °C W/m °C Temperature, °F Btu/ft h °F
20 14 68 8
100 15 200 8.5
200 17 400 10
300 18 600 10.5
400 20 800 11.5
500 21 1000 12.5
600 23 1100 13
Specific heat capacity
Temperature, °C J/kg °C Temperature, °F Btu/lb °F
20 485 68 0.11
100 500 200 0.12
200 515 400 0.12
300 525 600 0.13
400 540 800 0.13
500 555 1000 0.13
600 575 1100 0.14
Thermal expansion 1)
Temperature, °C Per °C Temperature, °F Per °F
30-100 16.5 86-200 9.5
30-200 17 86-400 9.5
30-300 17.5 86-600 10
30-400 18 86-800 10
30-500 18 86-1000 10
30-600 18 86-1200 10.5
30-700 18.5 86-1400 10.5

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

Modulus of elasticity 1)
Temperature, °C MPa Temperature, °F ksi
20 200 68 29.0
100 194 200 28.2
200 186 400 26.9
300 179 600 25.8
400 172 800 24.7
500 165 1000 23.5

1) (X103)

Welding

The weldability of Alleima® 3R64 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 Alleima® 3R64, heat input of <1.5 kJ/mm and interpass temperature of <100°C (210°F) are recommended.

Recommended filler metals

TIG/GTAW or MIG/GMAW welding

ISO 14343 S 19 13 4 L / AWS A5.9 ER317L (e.g. Exaton 19.13.4.L)

MMA/SMAW welding

ISO 3581 E 19 13 4 L R / AWS A5.4 E317L-16 (e.g. Exaton 19.13.4.LR)

ISO 14343 S 19 13 4 L / AWS A5.9 ER317L (e.g. Exaton 19.13.4.L) wire or strip electrodes are recommended for overlay welding of tube sheets and high-pressure vessels in cases where corrosion resistance, equal to that of Sandvik 3R64, is required.

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 Alleima materials.