Sheet, strip, wire 30KHN2MA - 30CrNiMo8 - 1.6580 - aisi 4340
Steel structural alloyed chromium-nickel-molybdenum. This steel is sensitive. to the formation of flock, According to GOST 4543−71 hardness of rolled steel from this steel after annealing HB 10 -1 = 241 N / mm 2 .
- Germany (DIN, WNr): 30CrNiMo8
- Japan (JIS): SNCM431
Crankshafts, connecting rods, critical bolts, studs, discs, sprockets and other critical parts that operate under severe loading conditions at normal, low and elevated temperatures.
Mechanical properties (temperature 20 ° C)
- sv — Short-term strength limit: 980 MPa
- sT — Proportionality limit (yield strength for permanent deformation): 785 MPa
- d5 — Elongation at break: 10%
- y — Relative narrowing: 45%
- KCU — Impact strength: 789 kJ / m 2
Percent composition, GOST 4543−71
|0.27 — 0.34||0.17 — 0.37||0.3 — 0.6||1.25 — 1.65||≤0.025||≤0.025||0.6 — 0.9||0.2 — 0.3||≤0.3|
Modulus of elasticity of the first kind
|t ° С||E 10 — 5|
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