σU
MPa

Multicomponent alloy based on iron 40KNHMVTYU

  • Chemical composition
    Al Aluminum 0.2 — 0.5
    W Tungsten 6.0 — 7.0
    Fe Iron Rest
    Co Cobalt 39.0 — 41.0
    Si Silicon <0.5
    Mn Manganese 1.8 — 2.2
    Mo Molybdenum 3.0 — 4.0
    Ni Nickel 18.0 — 20.0
    S Sulfur <0.02
    Ti Titanium 1.5 — 2.0
    C Carbon <0.05
    P Phosphorus <0.02
    Cr Chromium 11.5 — 13.0
    Domestic analogue — EP4

for wrist watch springs. Technical requirements — according to GOST 10994−74 and GOST 14118−85

Classification

Country Section Category
CIS, Russia, Ukraine Precision alloys With preset elastic properties

Chemical composition

Standard Fe, % Si, % Mn, % Co, % Cr, % Ti, % Ni, % Al, % P, % C, % S, % Mo, % W, %
GOST 10994-74 9.71–19 < 0.5 1.8–2.2 39–41 11.5–13 1.5–2 18–20 0.2–0.5 < 0.02 < 0.05 < 0.02 3–4 6–7

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers \sigma _{U}σU, MPaMPa Treatment
Wire cold-work 1470

Standards

Standard Description
GOST 10994-74

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Co % Cobalt
Cr % Chrome
Ti % Titan
Ni % Nickel
Al % Aluminium
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum
W % Tungsten

Description of mechanical properties

Parameter Units of measurement Description
\sigma _{U}σU MPaMPa Ultimate tensile strength