1.7220 (34CrMo4)

Classification

Country Section Category
Germany Structural, Pressure Vessel and Engineering Steels Cr-Mo with Mo < 0.35%, Cr-Mo-B

Chemical composition

Standard Fe, % Si, % Mn, % Cr, % P, % C, % S, % Mo, %
96.77–98.05 < 0.4 0.6–0.9 0.9–1.2 < 0.025 0.3–0.37 < 0.035 0.15–0.3

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{0.2}$$, $$MPa$$ $$\epsilon_{L (L_0 = 80 mm)}$$, % $$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$, % $$\epsilon_T$$, % $$R_{eH}$$, $$MPa$$ $$\psi$$, % $$KV_{L}$$, $$J$$ $$KV_{T}$$, $$J$$ Treatment
< 16 moderate hardening 1000–1200 11 10–12 800 45 35–45 25–27
16–40 moderate hardening 900–1100 12 650 50
40–100 moderate hardening 800–950 14 550 55
100–160 moderate hardening 750–900 15 450–500 55
160–250 moderate hardening 700–850 15 60
0.3–3 annealing, soft 600 460 16
< 8 moderate hardening 1000
8–20 moderate hardening 900
20–50 moderate hardening 800
50–80 moderate hardening 750
160–330 moderate hardening 410–450
annealing, carbide spheroidization 60

Brinell hardness number

Rolling Standard Classifiers Value, HBW
improved machinability 255
annealing, soft 223

Твёрдость по Викерсу

Rolling Standard Classifiers Value, HV
annealing, soft 185
moderate hardening 315–465

Technological Properties

Weldability
Boundedly welded

Analogues

CIS, Russia, Ukraine
35HML
AS38HGM

Standards

Standard Description
EN 10083-1
EN 10132-3

Description of chemical elements

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

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma_{0.2}$$ $$MPa$$ Tensile stress required to produce a total elongation of 0.2%
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\epsilon_{L (L_0 = 80 mm)}$$ % Elongation at break (longitudinal) (for L0 = 80 mm)
$$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$$ % Elongation at break (longitudinal) (for L0 = 5.65√So)
$$\epsilon_T$$ % Elongation at break (transverse)
$$R_{eH}$$ $$MPa$$ Upper yield point
$$\psi$$ % Reduction in cross section on fracture
$$KV_{L}$$ $$J$$ Impact energy (longitudinal)
$$KV_{T}$$ $$J$$ Impact energy (transverse)

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