United Kingdom · B.S.

605 M 36

BS PD 970:2005 — Wrought steels for mechanical and allied engineering purposes. Requirements for carbon, carbon manganese and alloy hot worked or cold finished steels

Chemical composition

wt% · log scale
0.1110C0.32 – 0.4Mn1.3 – 1.7Mo0.22 – 0.32
  • min – max range
  • typical value

Mechanical properties

value range by condition
Hardnessturnedbars, Softened, ground or cold drawn or turned, ground or cold drawn, finallyYield strength Rp0.2≥680 MPaTensile strength Rm850–1000 MPaImpact energy Kv/Ku≥50 JElongation A≥13 %HardnessHBbars +T, <= 63 mmYield strength Rp0.2≥850 MPaTensile strength Rm1000–1150 MPaImpact energy Kv/Ku≥42 JElongation A≥12 %HardnessHBbars +V, <= 19 mmYield strength Rp0.2≥525 MPaTensile strength Rm700–850 MPaImpact energy Kv/Ku≥50 JElongation A≥17 %HardnessHBbars +R, <= 150 mm

Fatigue S-N curve

stress vs. cycles (log)
406407407408408110Cycles
  • 1.Heat treated; T: 20°C; -

Chemical composition

ElementminmaxSimilarRemarks
C0.320.4
Mn1.31.7
Mo0.220.32

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
bars, Softened, ground or cold drawn or turned, ground or cold drawn, finallyturned HB
bars +T, <= 63 mm≥680850–1000≥13≥50 KCVHB 248–302 HBW
bars +V, <= 19 mm≥8501000–1150≥12≥42 KCVHB 293–352 HBW
bars +R, <= 150 mm≥525700–850≥17≥50 KCVHB 201–255 HBW
bars +R, <= 250 mm≥495700–850≥15≥21 KCVHB 201–255 HBW
bars +S, <= 100 mm≥585775–925≥15≥50 KCVHB 223–277 HBW
bars +U, <= 29 mm≥755925–1075≥12≥42 KCVHB 269–331 HBW
bars +R, > 150 <= 250 mm≥495700–850≥15≥28 KCVHB 201–255 HBW
bars +R, > 29 <= 150 mm≥525700–850≥17≥50 KCVHB 201–255 HBW
bars +S, > 13 <= 100 mm≥585775–925≥15≥50 KCVHB 223–277
bars +T, > 6 <= 63 mm≥680850–1000≥13≥50 KLCVHB 248–302 HBW
bars +U, >= 6 <= 29 mm≥755925–1075≥12≥42 KCVHB 269–331 HBW
bars +V, >= 6 <= 19 mm≥8501000–1150≥12≥42 KCVHB 293–352 HBW

Fatigue

Test conditions
ItemDetail
ProductHeat treated
ExperimentT: 20°C
Specimen
Monotonic
PropertyValue
Elastic modulus (GPa)200.0
Yield strength (MPa)849.0
Tensile strength (MPa)930.0
Reduction of area (%)62.0
True fracture strength (MPa)1859.0
True fracture ductility (%)0.97
Strength coefficient (MPa)3125.0
Strain-hardening exponent0.01
Hardness (HB)300.0
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
15900.090010181123.0-0.071.0-0.65
Stress life
No.Stress (MPa)Cycles
14072E6