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71 Si 7

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Germany DIN 71Si7 Cold Rolled Steel Strips for Springs; Technical Conditions of Delivery and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 71Si7 / 71 Si 7
Category Grade Standard Region/Area Standard Content
Metals 71 Si 7 DIN 17222 Germany Cold Rolled Steel Strips for Springs; Technical Conditions of Delivery

Chemical composition(mass fraction)(wt.%) of the 71 Si 7

Element Min Max Similar
Si 1.5000 1.8000 -
S - 0.0350 -
P - 0.0350 -
Mn 0.6000 0.8000 -
C 0.6800 0.7500 -

Mechanical Properties of steel grade 71 Si 7

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)
129 (≥) 828 (≥) 42 34 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 223

Physical Properties of steel grade 71 Si 7

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
11 - -     0.31 -  
743 653 - 44.3 133   -  
542 - 13 42.2   121 323

Heat Treatment of steel grade 71 Si 7

Heat treated : 1594°C - 1224°C

Technological Curves of steel grade 71 Si 7

Cross Reference Table (Equivalent Grade) of 71 Si 7

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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