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Material Description

Material Number Material Name Material Number (single) Standard Scope Standard Status Country Successor VDA 231-106 classification
1.1555 (DIN EN ISO 4957 : 2001-02) C120U 1.1555 DIN EN ISO 4957 : 2001-02 DIN EN ISO 4957 : 2001-02 replaced by DIN EN ISO 4957 : 2018-11 Replaced Germany C120U 1.1.1 1)
1) Remark: C120U is a water hardening (chill hardening) tool steel. It achieves in hardened condition at least 62 HRC. Application: turning chisels, scraper, drills, countersinks, special tools for watchmakers.

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 Temperature [°C] Hardness HB | HBW Hardness HRC
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Physical Properties

Temperature [°C] Density [g/cm³]
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Heat Treatment

Heat Treatment Step Temperature [°C] Medium
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Cross Reference

Material Name Country Standard
C120U Europe EN ISO 4957
C120U International ISO 4957 1)
TC13 India IS 1570 : Part 6 1)
118T3 India IS 1570 : Part 6 1)
118T3 India IS 3748 1)
SK120 Japan JIS G 4401 1)
U12A-1 Russia 1)
У12A-1 Russia 1)
STC120 South Korea KS D 3751 1)
A686 Type W1 USA ASTM A686 2)
W1 USA AISI 1)
W112 USA SAE J 438 1)
T72301 USA UNS 1)
1) Source: Stahlschlüssel 2016, Verlag Stahlschlüssel Wegst GmbH, Marbach
2) Source: Metals & Alloys in the Unified Numbering System, SAE/ASTM, 11th Edition, 2008

Linear-elastic

Temperature [°C] Young's modulus [GPa] Bulk modulus [GPa] Shear modulus [GPa] Poisson's ratio
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Density

Temperature [°C] Density [g/cm³]
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Classification

WIAM Material Treatment Semi-finished product Dimension [mm] Load type Failure criteria Rolling direction Maximum stress [MPa] Strain at maximum stress [%] Source description
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Designation

Designation Material number Source
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