27SiMn Structural Steel to GB/T 11251 (2009)

27SiMn - Specification & Application

  • GB/T 11251 (2009) - Hot-rolled alloy structural steel plates
  • GB/T 17396 (2009) - Hot-rolled seamless steel tubes for hydraulic pillar service
  • GB/T 3077 (1999) - Alloy structure steels
  • GB/T 3078 (2008) - Quality structural steel cold drawn bars
  • GB/T 8162 (2008) - Seamless steel tubes for structural purposes

Structural and constructional steels

Chemical composition(wt.%) of 27SiMn grade: to GB/T 11251 (2009)

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.24 0.32
Si 1.10 1.40
Mn 1.10 1.40
P - 0.035
S - 0.035
Cu - 0.30
Cr - 0.30
Ni - 0.30
Mo - 0.15

27SiMn - Detail

27SiMn

Mechanical properties of grade 27SiMn GB/T 11251 (2009)

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)
886 (≥) 275 (≥) 23 22 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 341

Physical properties of grade 27SiMn GB/T 11251 (2009)

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
732 (≥) 876 (≥) 24 12 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 124
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
758 327 113

Equivalent Grade

Equivalent Products

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