United Kingdom · B.S.

E355

BS EN 10305-4 — Steel tubes for precision applications. Technical delivery conditions. Part 4:Seamless cold drawn tubes for hydraulic and pneumatic power systems

Chemical composition

wt% · log scale
0.0010.010.1110Al0.02C0.22Mn1.6P0.025S0.015Si0.55
  • min – max range
  • typical value

Mechanical properties

value range by condition
Yield strength Rp0.2≥355 MPaTensile strength Rm490–630 MPaImpact energy Kv/Ku≥27 JElongation A≥22 %

Fatigue S-N curve

stress vs. cycles (log)
240241241242242110Cycles
  • 1.Plates; 20 mm thick; Weld metal, stress-relieved; Total strain control; R=-1; T: 23°C; Cylindrical; Diameter [mm]: 10; Gauge length [mm]: 12.5

Chemical composition

ElementminmaxSimilarRemarks
Al0.02Al tot is not applicable if steel contains a sufficient amount of other nitrogen binding elements such as Ti
C0.22
Mn1.6
OtherAdditions of Nb
P0.025
S0.015
Si0.55
TiWhen using titanium

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
Seamless tubes, cold drawn≥355 For tubes with outside diameter D ≤ 30 mm and wall thickness T ≤ 3 mm490–630≥22 Elongation after fracture≥27 Charpy V Notch (0°C)

Fatigue

Test conditions
ItemDetail
ProductPlates; 20 mm thick; Weld metal stress-relieved
ExperimentTotal strain control; R=-1; T: 23°C
SpecimenCylindrical; Diameter [mm]: 10; Gauge length [mm]: 12.5
Monotonic
PropertyValue
Elastic modulus (GPa)204.0
Yield strength (MPa)610.0
Tensile strength (MPa)708.0
Elongation (%)16.0
Reduction of area (%)72.0
Strength coefficient (MPa)750.0
Strain-hardening exponent0.034
Hardness (HV)235.0
Strain life
No.Cyclic yield strength (MPa)Cyclic strain-hardening exponent n′Cyclic strength coefficient K′ (MPa)Fatigue strength coefficient σ′f (MPa)Fatigue strength exponent bFatigue ductility coefficient ε′fFatigue ductility exponent c
13970.14809971002-0.09830.9988-0.6594
Stress life
No.SpecimenStress (MPa)Cycles
1Cylindrical; Diameter [mm]: 10; Gauge length [mm]: 12.52412E6