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55Si2Mn Application:China structural steel and alloy steel
Category Type Steel grade Standard Country
Grades Special Alloy 55Si2Mn GBT China

Chemical composition % of the ladle analysis of grade 55Si2Mn

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%)
0.52-0.60 1.50-2.00 0.60-0.90 0.035 0.035 Max 0.35 Max 0.35
55Si2Mn
Mechanical properties of grade 55Si2Mn
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)
534 (≥) 852 (≥) 34 41 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 311
Physical properties of grade 55Si2Mn
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
526 (≥) 124 (≥) 34 12 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 441
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
967 761 349
55Si2Mn 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

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