27SiMn hot rolled steel round bars

27SiMn has good machinability and cold deformation plasticity. It maintains high strength and wear resistance during heat treatment and high toughness during water quenching. 27SiMn steel is widely used in automobile, petroleum, chemical industry, shipping industry, 27SiMn steel tubes are normalized and tempered, phosphate oiled inside and outside,  is generally used for manufacturing hot stamping parts requiring high toughness and wear resistance, such as various hydraulic parts.

Chemical composition(mass fraction)(wt.%) of the 27SiMn

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

Yield Rp0.2 (MPa)	Tensile Rm (MPa)	Impact KV (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	HBW
551 (≥)	144 (≥)	11	41	43	Solution and Aging, Annealing, Ausaging, Q+T,etc	344

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
375 (≥)	157 (≥)	33	32	31	Solution and Aging, Annealing, Ausaging, Q+T,etc
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0) N/mm2	Creep rupture strength (10000h) (Rp1,0) N/mm2	-	-	-
397	975	844	-	-	-

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