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GB 27SiMn Details

27SiMn

GB 27SiMn Standard Download

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27SiMn Application:Structural and constructional steels
Category Type Grade Designations
Grades Structural Steel 27SiMn China - GB , 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
Chemical composition(mass fraction)(wt.%)
Elements Min.(≥) Max.(≤)
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
Mechanical properties of grade 27SiMn
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)
656 (≥) 829 (≥) 44 34 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 222
Physical properties of grade 27SiMn
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
124 (≥) 514 (≥) 21 31 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 332
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
198 389 234
27SiMn Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
27SiMn GB China
Structural and constructional steels

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