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Datasheet updated

2023-11-09 14:40
(supersedes all previous editions)

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Exera® 12R10 and Exera® 12R10 HV (vacuum remelted) are austenitic stainless steels characterized by moderate tensile strength, good corrosion resistance and moderate fatigue and relaxation resistance.

Vacuum-remelted Exera® 12R10 HV offers higher cleanliness compared to Exera® 12R10, which is usually required for medical applications.

Service temperature: -200 to 250°C (-330 to 480°F).

Exera® 12R10 and Exera® 12R10 HV are characterized by:

  • High tensile strength and tempering effect
  • Good relaxation resistance, especially at elevated temperatures
  • High fatigue strength

Standards

  • ASTM: 302/302VM, '304V'
  • ISO: X9 CrNi 18-8 Grade 1 NS
  • EN Number: 1.4310 NS
  • EN Name: X10CrNi18-8NS
  • W.Nr.: 1.4310
  • JIS: SUS 302/304-WPB

Product standards

EN 10270-3
ISO 6931-1
ASTM A 313/A 313M, F899
JIS G 4314

Applications

Exera® 12R10/12R10HV can be used for blood lancets, stylets, acupuncture needles and dental files and reamers.

Chemical composition (nominal) %

C Si Mn P S Cr Ni
0.08 0.5 1.2 ≤0.040 ≤0.010 18 8.3

Forms of supply

Surface finishSize range, mm
Coated
0.20 - 10.00
Nicoat A (nickel coating)
0.22 - 2.50
Bright
0.11 - 0.80
Nicoat P (nickel coating + bright)
0.11 - 0.80
Mechanically polished
Degreased
0.40 - 6.00
0.50 - 5.00

Wire is delivered in in a number of different forms to meet customers' requirements:

  • In coils with weights up to 150 kg
  • On spools with wire weights up to 500 kg
  • In straightened lengths up to 4 m, diameters between 0.6 to 10 mm

Mechanical properties

Mechanical properties in the 'as delivered' condition

Tensile strength and proof strength, MPa (ksi)

Wire diameter Nominal, Rm1 Nominal Rp0.2
mm in. MPa ksi MPa ksi
0.15 – 0.20 0.0059 - 0.0079 2365 343 1890 274
>0.20 – 0.30 >0.0079 - 0.012 2310 335 1850 268
>0.30 – 0.40 >0.012 - 0.016 2260 328 1810 262
>0.40 – 0.50 >0.016 - 0.020 2200 319 1760 255
>0.50 – 0.65 >0.020 - 0.026 2150 312 1720 249
>0.65 – 0.80 >0.026 - 0.031 2095 304 1680 244
>0.80 – 1.00 >0.031 - 0.039 2045 297 1635 237
>1.00 – 1.25 >0.039 - 0.049 1990 289 1590 231
>1.25 – 1.50 >0.049 - 0.059 1935 281 1550 225
>1,50 – 1,75 >0.059 - 0.069 1880 273 1505 218
>1.75 – 2.00 >0.069 - 0.079 1830 265 1465 212
>2.00 – 2.50 >0.079 - 0.098 1775 257 1420 206
>2.50 – 3.00 >0.098 - 0.118 1720 249 1375 199
>3.00 – 3.50 >0.118 - 0.138 1665 241 1330 193
>3.50 – 4.25 >0.138 - 0.167 1615 234 1290 187
>4.25 – 5.00 >0.167 - 0.197 1560 232 1250 181
>5.00 – 6.00 >0.197 - 0.236 1505 218 1205 175
>6.00 – 7.00 >0.236 - 0.276 1450 210 1160 168
>7.00 – 8.50 >0.276 - 0.335 1400 203 1120 162
>8.50 – 10.00 >0.335 - 0,394 1345 195 1075 156

1)tolerance on tensile strength + /- 7.0 % in accordance with EN 10 270-3 (ISO 6931-1).

Exera® 12R10 can be supplied in the annealed condition.

Tensile strength can be increased by 150–250 MPa (22 - 36 ksi) by tempering. Click on heat treatment for further information. The tensile strength variation between spools/coils within the same production lot is ±50 MPa (7 ksi) maximum.

Proof strength in the tempered condition is approx. 85% of the tempered tensile strength. Tensile strength values are guaranteed and are measured directly after production. During storage, the strength will increase slightly due to ageing. Depending on storage conditions, ageing can increase the strength by 0 - 50 MPa (0 - 7 ksi)

The strength will decrease by 3–4% per 100°C (184oF) increase in service temperature.

Straightened lengths

After straightening, the strength is approx. 7% lower.

Physical properties

Density: 7.9 g/cm3, 0.29 lb/in3

Specific heat capacity
500 J/kg °C in the temperature range 50 - 100°C
0.12 Btu/lb °F in the temperature range 120 - 210°F

Thermal conductivity
Temperature, °CW/m °CTemperature, °FBtu/ft h °F
20 15 68 9
100 16 210 9
200 18 390 10.5
300 19 570 11.5

Resistivity
Temperature, °CμΩmTemperature, °FμΩin.
20 0.80 68 31
100 0.85 200 33
200 0.90 400 36
300 0.95 600 38

Thermal expansion 1)
Temperature, °Cper °CTemperature, °Fper °F
20 - 100 17 68 - 210 9.5
20 - 200 17.5 68 - 390 9.5
20 - 300 18.5 68 - 570 10.0

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

Magnetic permeability, μmax: about 10

Shear modulus, MPa (ksi)

As delivered: approx 71 000 (10 295)
Tempered: approx 73 000 (10 585)

Modulus of elasticity, MPa (ksi)

As delivered: approx 185 000 (26 825)
Tempered: approx 190 000 (27 550)

Heat treatment

By tempering at 350°C (660°F)/0.5–3 h, the tensile strength will increase by about 100-250 MPa (15 - 35 ksi). If a shorter tempering time is used the tempering effect will be lower.

  • In continuous conveyor furnaces, where the holding time at temperature is very short (min. 3 minutes), the temperature can be increased to about 425°C (780°F)
  • In the 'as delivered' condition, the ratio proof strength/tensile strength is about 0.80. After tempering the ratio will be about 0.85

Please note that tension springs coiled with initial tension must not be tempered at the same high temperature as other types of spring. We recommend batch annealing at 200°C (390°F)/0.5–3 h, or continuous tempering in a conveyor furnace with a holding time of 3–20 minutes at about 250°C (480°F).

Bending

The minimum bending radius should not be less than half the wire diameter. Wire surfaces should be free from any damage caused by tooling, since slight imperfections in the surface can lead to fracture even at large bending radii.

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.