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Material Description

Material Number Material Name Material Number (single) Standard Scope Standard Status Country Successor VDA 231-106 classification
1.0721 (DIN EN 10277 : 2018-09) 9S20 1.0721 DIN EN 10277 : 2018-09 DIN EN 10277 : 2018-09 replaced by DIN EN ISO 683-7 : 2025-02 Replaced Germany 9S20 1.1.1 1)
1) Remark: Free-cutting steel 9S20 semi-finished products (e.g. blooms, billets, slabs), bars and wire rod not intended for heat treatment for mechanical purposes.

Chemical Composition

C [%] Mn [%] P [%] S [%] Si [%] Remainder
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Material Compliance

REACh RoHS
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Mechanical Properties

Semi-finished Product Condition Nominal Size [mm] Temperature [°C] Tensile Strength [MPa] Hardness HB | HBW
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Physical Properties

Temperature [°C] Density [g/cm³] Young's Modulus [GPa] Mean Coefficient of Thermal Expansion (reference 20°C) [10^-6*K^-1] Differential Coefficient of Thermal Expansion [10^-6*K^-1] Thermal Conductivity [W/(m*K)] Thermal Diffusivity [10^-6 m²/s] Specific Electrical Resistance [µΩm] Mean Specific Heat Capacity [kJ/(kg*K)] True Specific Heat Capacity [kJ/(kg*K)]
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Cross Reference

Material Name Country Standard
Y08 China GB/T 8731 1)
U71082 China ISC 2)
9S20 Europe EN 10277
1.0711 Europe 2)
1.0721 Europe 1)
10C8S10 India IS 4431 2)
9S20 Europe EN ISO 683-4
9S20 International ISO 683-4
SUM21 Japan JIS G 4804 2)
SUM21 South Korea KS D 3567 2)
A11 Russia GOST 1414 2)
1212 USA SAE 2)
G12120 USA UNS 2)
1) Source: EN ISO 683-4 : 2018-06
2) Source: Stahlschlüssel 2016, Verlag Stahlschlüssel Wegst GmbH, Marbach

Producer/Supplier/Trade names

Tradename Supplier
9S20 HEINE + BEISSWENGER Stiftung + Co.KG, Fellbach
9S20 INTERSTAHL Service GmbH, Wetter
9S20 Klöckner Stahl- und Metallhandel GmbH, Bremen
9S20 pauly STAHLHANDEL, Essen
9S20 Salzgitter Mannesmann Stahlhandel GmbH, Düsseldorf
9S20 Swiss Steel International GmbH, Düsseldorf
9S20 ThyssenKrupp Schulte GmbH, Essen