Alleima® 7C27 is a martensitic stainless chromium steel characterized by very good hardening properties and very good cold formability. After hardening and tempering, the grade has very good corrosion resistance and toughness.
Alleima® 7C27 is characterized by:
- Soft delivery condition
- Very good hardening properties
- Very good cold formability
- High corrosion resistance after hardening and tempering
Standards
- ASTM: 420
- AWS: ER 420
- EN Number: 1.4028 Mod./1.4031 Mod.
- W.Nr.: 1.4007
- DIN: X35Cr14
- SS: 2304
- AFNOR: Z 30C13(13H)
Product standards
- ASTM F899
- ISO 16061
Applications
Alleima® 7C27 can be used for surgical suture needles, dental burrs, drills and tartar removers.
Chemical composition (nominal) %
| C | Si | Mn | P | S | Cr |
|---|---|---|---|---|---|
| 0.32 | 0.2 | 0.3 | ≤0.025 | ≤0.010 | 13.5 |
Forms of supply
The wire is supplied coated with an anti-corrosion oil that should not be removed in storage. In cases where the first work operation is a straightening-cutting operation, the oil acts as an excellent lubricant and prevents scratching of the wire surface.
After the oil is removed, the wire should not be stored on premises with a high moisture content, since the material can be subject to corrosion in the unhardened state.
The wire surface is bright in diameters 0.10 - 2.50 mm (0.004 - 0.098 in.). Larger wire diameters can be manufactured on request.
| Dimension | Spool no | Wire weight | ||
|---|---|---|---|---|
| mm | in. | kg | lb | |
| 0.285 - 1,6 | 0.011 - 0.063 | 23 | max 16 | max 35 |
| Dimension, mm | Inside diameter of coil, mm | Wire weight, kg |
|---|---|---|
| 0.50 - 0.80 | 250 | max 16 |
| >0.80 - 1.60 | 300 | max 20 |
| >1.60 - 1.80 | 300 | max 20 |
| >1.80 - 2.50 | 450 | approx. 60 |
| Dimension, in. | Inside diameter of coil, in. | Wire weight, lb |
|---|---|---|
| 0.02- 0.031 | 9.8 | max 35 |
| >0.031 - 0.063 | 11.8 | max 44 |
| >0.063- 0.071 | 11.8 | max 44 |
| >0.071 - 0.098 | 17.7 | approx. 132 |
In exceptional cases, spools or coils of lower weight than given in the above tables can be included in a delivery.
Tolerances
The diameter tolerance is normally D3. The wire can also be supplied with tolerance grades D1 and D2.
| Dimension, mm | Diameter tolerance, mm +/- | ||
|---|---|---|---|
| D1 | D2 | D3 | |
| 0.10 - 0.125 | 0.007 | 0.004 | 0.002 |
| >0.125 - 0.25 | 0.009 | 0.005 | 0.003 |
| >0.25 - 0.50 | 0.011 | 0.007 | 0.004 |
| >0.50 - 1.00 | 0.014 | 0.009 | 0.005 |
| >1.00 - 1.60 | 0.018 | 0.011 | 0.006 |
| >1.60 - 2.50 | 0.023 | 0.014 | 0.008 |
| Dimension, in. | Diameter tolerance, in. | ||
|---|---|---|---|
| D1 | D2 | D3 | |
| 0.004 - 0.005 | 0.00028 | 0.00016 | 0.00008 |
| >0.005 - 0.010 | 0.00035 | 0.00020 | 0.00012 |
| >0.010 - 0.020 | 0.00043 | 0.00028 | 0.00016 |
| >0.020 - 0.039 | 0.00055 | 0.00035 | 0.00020 |
| >0.039 - 0.063 | 0.00071 | 0.00043 | 0.00024 |
| >0.063 - 0.098 | 0.00091 | 0.00055 | 0.00032 |
Mechanical properties
The wire is supplied in tensile strengths within the range shown in the table below. The smaller the diameter, the higher the tensile strength within the stipulated range.
| Tensile strength, Rm | MPa (ksi) |
|---|---|
| 730 - 900 (106 - 131) |
Other tensile strengths can be supplied on request.
Physical properties
Density: 7.7 g/cm3, 0.28 lb/in3
Heat treatment
Soft-annealing
When required, soft-annealing should be conducted for a period of one hour at a temperature of 650-680°C (1200-1250oF).
| Temperature, oC (oF) | 1050 - 1080 (1920 - 1975) |
| Holding time, minutes | 5 - 6 |
Quenching in oil or in protective gas.
To prevent oxidation, hardening should be carried out in a protective gas atmosphere using nitrogen or argon, alternatively in vacuum. The use of other gases can cause brittleness, blanks sticking together etc.
| Tempering time, minutes | 30 |
| Temperature , oC (oF) | 250-300 (480-570) Depending on the final hardness and ductility required |
Haftungsausschluss: Sandvik bietet keine Produkte oder Dienstleistungen, die in irgendeiner Weise gedacht oder zu verstehen sind als Empfehlung oder anderweitige Beratung aus medizinischer/biologischer/sicherheitstechnischer Sicht in Bezug auf das Design, die Eignung, Angemessenheit oder Effektivität von medizinischen Werkstoffen, Instrumenten und/oder Medizingeräten.