08H17N5M3 (EI925, X17H5M3)

for products operating at atmospheric conditions, acetic acid and sulfuric acid environments; austenitic steel — martensitic class

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, % Mo, %
GOST 5632-72 71.745–76.44 < 0.8 < 0.8 16–17.5 4.5–5.5 < 0.035 0.06–0.1 < 0.02 3–3.5

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{P}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % $$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ Treatment
Forgings GOST 25054-81 1176 833 10–15 35–40 390–690
Sheet GOST 4986-79 1130 8–16 Normalization
Sheet GOST 5582-75 1180 610 20 Hardening of 1030-1080 ° C, air
The sheet is thin and hardened. GOST 4986-79 1230 2–4

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Forgings GOST 25054-81 341–415

Technological Properties

Weldability
no limits

Analogues

Germany USA
X4CrNiMo16-5 AM350

Standards

Standard Description
GOST 5632-72
TU 14-1-1831-76

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
Mo % Molybdenum

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
$$KCU\cdot 10^{3}$$ $$\frac{J}{m^2}$$ Impact toughness

Designation of types of weldability

Parameter Units of measurement Description
no limits Welding is performed without heating and without subsequent heat treatment
Boundedly welded Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures