75 Structural Steel to PN-H-84032 (1974)

75 - Specification & Application

  • PN-H-84032 (1974) - Steel for springs - Grades
  • PN-H-93005 (1996) - Steel for springs — Peeled bars, cold drawn bars and wires

Steel for springs — Peeled bars, cold drawn bars and wires

Chemical composition(wt.%) of 75 grade: to PN-H-84032 (1974)

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.72 0.80
Si 0.17 0.37
Mn 0.50 0.80
P - 0.040
S - 0.040
Cr - 0.35
Ni - 0.30
Cu - 0.25

75 - Detail

Steel for springs — Peeled bars, cold drawn bars and wires

Mechanical properties of grade 75 PN-H-84032 (1974)

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
876 (≥) 915 (≥) 23 32 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 322

Physical properties of grade 75 PN-H-84032 (1974)

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
266 (≥) 213 (≥) 23 14 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 434
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
271 841 422

Equivalent Grade

Equivalent Products

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