4H2NMF

Steel hard-to- weld, weakness to temper embrittlement. Flock sensitivity: insensitive. Hardness 4H2NMF normalized HB 10 -1 = 321 — 364 MPa. Substitute: 38H2NMF.

forging dies with height up to 700 mm cube hot forging parts from hard materials.

Classification

Country Section Category
CIS, Russia, Ukraine Tool steel Die tool steel

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % Ni, % V, % P, % C, % S, % Mo, %
TU 24-1-12-180 - 0 93.95–95.62 0.17–0.37 0.5–0.8 2–2.5 0.8–1.1 0.15–0.2 < 0.03 0.36–0.42 < 0.03 0.4–0.6

Information on suppliers

Technological Properties

Weldability Flake Susceptibility Propensity to temper brittleness
Difficult to weld insensitive loathsome

Critical point temperatures

Ac1, K Ac3(Acm), K
760 820

Standards

Standard Description
TU 24-1-12-180 - 0

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Si % Silicon
Mn % Manganese
Cr % Chrome
Ni % Nickel
V % Vanadium
P % Phosphorus
C % Carbon
S % Sulfur
Mo % Molybdenum

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

Description of temperatures of critical points

Parameter Units of measurement Description
Ac1 K
Ac3(Acm) K