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55Si7/56Si7 (DIN EN spring steel grade)

Description

General

Composition of 56Si7 (DIN EN 10132-4 spring steel grade) in weight %: Ferro (Fe) rest, Carbon (C) 0.52-0.60, Silicon (Si) 1.50-1.80, Manganes (Mn) 0.70-1.10 (wt.%)
1.5026 (DIN EN 10132-4 steel number), 55Si7 (DIN 17222), 9255 (USA SAE/AISI/ASTM), 251A58 (UK BS)

Properties

Chemical properties

Minimum value Maximum value Unit Sources
%
%

Electrical properties

Minimum value Maximum value Unit Sources
kV/mm
%
-0.45 -0.45 V
Ohm.mm²/m

Manufacturing Properties

Minimum value Maximum value Unit Sources

Mechanical properties

Minimum value Maximum value Unit Sources
MPa
MPa
MPa
7850 7850 kg/m³
6 6 %
MPa
J/cm
MPa
1500 1700 MPa
MPa
1100 1100 MPa
210000 210000 MPa

Optical properties

Minimum value Maximum value Unit Sources

Thermal properties

Minimum value Maximum value Unit Sources
°C
1500 1500 °C
°C
J/kg.K
W/m.K
e-6/K

Environment

4.36 mPt
0.09 Pt
965 mELU
3.24 MJ/MJ
22.5 MJ
3.1 kg
0.01 kg
Environmental data for the production of 1 kg crude steel from SPIN. Transport is added. The coal comes for 65% from Canada, 23% Australia, 12% from the EEC. Iron ore comes for 37% from Brasil, 21% Australia, 31% Europe and the remaining 11% from elsewhere. Lime is imported from Belgium. Metallic alloy elements are assumed to be added in the required percetages. For details on the winning and refining of the elements see [Metallic Elements]. The production and emission data are for 1989.
Idemat 2003, Design for Sustainability, Delft University of Technology

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