Alloy 40KKHNM (ЭИ995)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40КХНМ |
| Designation GOST Latin |
40KXHM |
| Transliteration |
40KHNM |
| The chemical elements |
40CoCrNiCu |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ995 |
| Designation GOST Latin |
EI995 |
| Transliteration |
EhI995 |
| The chemical elements |
- |
Description
Alloy 40KKHNM used: for the production of elastic and provocatively elements; springs clockworks twisted cylindrical springs operating at temperatures to +400 °C, the cores of electrical appliances; cold-rolled strip thickness 0,10−2,0 mm and cold rolled wire with diameter 0.1−6.0 mm, intended for the manufacture of connecting elements (brackets for suturing blood vessels, frames, artificial heart valves) cardiovascular and other implantable items used in surgery (brackets for overlapping mechanical joints on organs and tissues, implants, etc.).
Note
Alloy with a temporary resistance wire 2450- 2650 MN/m2 (250−270 kgf/mm2), with the normal elasticity modulus 196000 MN/m2 (20000 kgf/mm2), non-magnetic corrosion resistant in aggressive environments and in tropical climates, the strain-hardening.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 10994-74 |
| Tapes |
В34 |
GOST 14117-85 |
| Steel alloy wire |
В73 |
GOST 14118-85, GOST Р 51397-99, TU 14-1-1285-75, TU 14-1-899-74 |
| Sectional and shaped rolling |
В32 |
GOST 31625-2012, TU 14-11-245-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Mo |
Co |
| GOST Р 51397-99 |
≤0.15 |
≤0.015 |
≤0.015 |
1-2.5 |
18.5-21.5 |
≤1 |
14-18 |
The rest |
6.5-8 |
39-42 |
| GOST 10994-74 |
0.07-0.12 |
≤0.02 |
≤0.02 |
1.8-2.2 |
19-21 |
≤0.5 |
15-17 |
The rest |
6.4-7.4 |
39-41 |
Co is the basis.
In accordance with GOST R 51397-99, minor deviations in the mass fraction of the elements indicated in the table are allowed in agreement with the health authorities, without entailing changes in the structure and mechanical properties.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d |
| Cold-rolled steel strip as supplied by GOST 14117-85 |
| 0.1-2 |
- |
≥1670 |
- |
| 0.1-2 |
- |
1370-1770 |
- |
| 0.1-2 |
- |
1080-1470 |
≥1 |
| Cold-rolled steel strip as supplied by GOST 14117-85. Aging at 450-550 °C (delay of 2-4 h), air cooling |
| - |
1760-2350 |
1960-2650 |
1-3 |
| - |
1470-1760 |
1670-1900 |
3-5 |
| - |
1180-1470 |
1370-1670 |
5-8 |
| Cold-rolled steel strip and cold drawn wire for medical purposes according to GOST R 51397-99. The treatment chosen by the manufacturer to achieve desired properties |
| - |
≥1300 |
≥1450 |
≥8 |
| - |
≥450 |
≥950 |
≥65 |
| Wire cold drawn vysokokachestvennoj in the state of delivery according to GOST 14118-85. Aging at 350-450 °C (delay of 2-4 h), air cooling |
| 0.1-0.5 |
- |
≥2160 |
- |
| 0.53-1 |
- |
≥2060 |
- |
| Wire cold drawn nagarebana in the state of delivery according to GOST 14118-85. Aging at 400-500 °C (delay of 2-4 h), air cooling |
| ≥1 |
- |
≥1570 |
- |
| 0.1-0.5 |
- |
≥1810 |
- |
| 0.53-1 |
- |
≥1720 |
- |
| Wire cold drawn polonikova in the state of delivery according to GOST 14118-85. Aging at 450-550 °C (delay of 2-4 h), air cooling |
| ≥1 |
- |
≥1270 |
- |
| 0.1-0.5 |
- |
≥1470 |
- |
| 0.53-1 |
- |
≥1370 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
