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UNI 55 Si 8

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UNI 41 Cr 4 KB UNI G 4O CrMo 4
#UNI # #55

Description

UNI 55 Si 8 Alloy Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Alloy Steel: UNI 55 Si 8
Category Type Steel Grade Standard Country Application
Steel GradesAlloy Steel UNI 55 Si 8
UNI 38 Cr 4 KB
UNI 38 CrB 1 KB
UNI 38 CrMo 4
UNI 38 CrMo 4 KB
UNI 40 Cr 4
UNI 40 CrMo 4
UNI 40 NiCrMo 2 KB
UNI 40 NiCrMo 7
UNI 40 NiCrMo 7 KB
UNI 41 Cr 4 KB

Chemical composition(mass fraction)(wt.%) of the UNI 55 Si 8

Element Weight %
C 0.51-0.59
Mn 0.70-0.95
P 0.035 (max)
S 0.04 (max)
Si 1.80-2.20

Mechanical Properties of steel grade UNI 55 Si 8

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
147 (≥) 499 (≥) 42 31 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 433

Physical Properties of steel grade UNI 55 Si 8

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
14 - -     0.43 -  
642 218 - 14.3 421   -  
629 - 42 43.2   443 343

Heat Treatment of steel grade UNI 55 Si 8

Heat treated : 1115°C - 1136°C

Technological Curves of steel grade UNI 55 Si 8

Cross Reference Table (Equivalent Grade) of UNI 55 Si 8

Grade Standard Country Application
UnitempAF2-1 USA Martensitic special steel
UnitempHS AISI USA Martensitic special steel
Q195 China Engineering and welding
Q215 China Engineering and welding
Q215 B China Engineering and welding
Q235 China Engineering and welding
Q235 B China Engineering and welding
Q235 C China Engineering and welding
Q235 D China Engineering and welding
Q255 A China Engineering and welding
Q255 B China Engineering and welding
Q275 China Engineering and welding
Q235q C China Bridge structure with steel
Q235q D China Bridge structure with steel
Q345q E China Bridge structure with steel
Q345q C China Bridge structure with steel
ASTM 1030 ASTM USA General use carbon steel bar
UNS G10300 UNS USA General use carbon steel bar
ASTM 1005 ASTM USA General use carbon steel bar
UNS G10050 UNS USA General use carbon steel bar
UNI 41 Cr 4 KB UNI G 4O CrMo 4
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Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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