12H17G9AN4 (EI878, H17G9AN4)

Used in the aviation industry.

for products operating under atmospheric conditions at temperatures up to 350 degrees C; austenitic steel

Classification

Country Section Category
CIS, Russia, Ukraine Corrosion-resistant alloys and steels Corrosion-resistant ordinary steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % P, % C, % S, % N, %
GOST 5632-72 65.775–72.35 < 0.8 8–10.5 16–18 3.5–4.5 < 0.035 < 0.12 < 0.02 0.15–0.25

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % Treatment
Rod GOST 5949-75 690 345 45 55 Hardening of 1050-1100 ° C, air
The plates GOST 7350-77 690 345 40 hardening
Sheet GOST 5582-75 690 40 Hardening of 1050-1080 ° C, cooling water
The sheet is thin and hardened. GOST 5582-75 980 15
Sheet GOST 4986-79 640 20–40 Hardening of 1050-1080 ° C

Analogues

Germany USA
X8CrMnNi188 202

Standards

Standard Description
GOST 5632-72
TU 14-1-377-72

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Ni % Nickel
P % Phosphorus
C % Carbon
S % Sulfur
N % Nitrogen

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\sigma_{P}$$ $$MPa$$ Proportionality limit
$$\epsilon_L$$ % Elongation at break (longitudinal)
$$\psi$$ % Reduction in cross section on fracture