27SiMn

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)

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)
631 (≥)	332 (≥)	33	12	44	Solution and Aging, Annealing, Ausaging, Q+T,etc	342

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
481 (≥)	791 (≥)	31	24	21	Solution and Aging, Annealing, Ausaging, Q+T,etc	421
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0) N/mm2	Creep rupture strength (10000h) (Rp1,0) N/mm2
868	732	213