40gr

To improve the production of after — rivets critical applications; after carburizing or cyanidation — piston pin, friction disc spring fingers, the cam rollers, bolts, nuts, screws, gears, worms and other parts with high surface hardness and wear resistance; without heat treatment — welding the sub-frames, shoes, scarves, fittings, plugs; The track link of tractors.

Classification

Country Section Category
CIS, Russia, Ukraine Structural steel Alloyed structural steel

Chemical composition

Standard Fe, % Si, % B, % Mn, % Cr, % Cu, % Ni, % P, % C, % S, %
GOST 4543-71 97.205–98.759 0.17–0.37 0.001–0.005 0.7–1 < 0.3 < 0.3 < 0.3 < 0.035 0.37–0.45 < 0.035

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
Rod GOST 4543-71 25 590 355 17 45 590 Tempering 860 ° C, air Accommodation 600 ° C, air

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 4543-71 207

Analogues

USA Germany
G10430 1.1157 (40Mn4)

Standards

Standard Description
GOST 4543-71

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
B % Bor
Mn % Manganese
Cr % Chrome
Cu % Copper
Ni % Nickel
P % Phosphorus
C % Carbon
S % Sulfur

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