Products

C4C - Nr.1.0303

Automotive

Fasteners

Ultra-Low Carbon Steel for Cold Forming

Steel with a very low carbon content, intended for the cold forming of very deformed and difficult-to-obtain small parts.

References and Comparable Standards

Standard Reference: EN 10263-2: 2017

References and Comparable Standards
EUROPE		ITALY	GERMANY		FRANCE	UK	USA
EN 10263-2: 2001		(UNI 7356 - 74)	(DIN 1654-2:89)		(NFA35-564:83)	-	ASTM
Grade	N°		Werkstoff	N°
C4C	1.0303	CB4FF	QSt32-3	-	XC6FF	-	-

EUROPE

StandardEN 10263-2: 2001

GradeC4C

N°1.0303

ITALY

Standard(UNI 7356 - 74)

GradeCB4FF

GERMANY

Standard(DIN 1654-2:89)

WerkstoffQSt32-3

N°-

FRANCE

Standard(NFA35-564:83)

GradeXC6FF

Standard-

Grade-

USA

StandardASTM

Grade-

Chemical Composition (Cast Analysis) (%)

Chemical Composition (Cast Analysis) (%)
C	Si/max	Mn	P/max	S/max	Al
0,02-0,06	0,10	0,25-0,40	0,020	0,025	0,020-0,060

Chemical Composition (Cast Analysis) (%)
Element	Value (%)
Carbon	0,02-0,06
Silicon	0,10
Manganese	0,25-0,40
Phosphorus	0,020
Sulfur	0,025
Aluminium	0,020-0,060

Mechanical Properties

Mechanical Properties
Size (mm)	Untreadted (+U) or Untreadted + Peeled (+U +PE)		Spheroidized (+AC) or as Treated + Peeled (+AC +PE)		Cold Drawn (+U +C)		Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)		Spheroidized + Cold Drawn (+AC +C)
Size (mm)	Tensile Strength Rm (MPa) max	Min. Reduction of Area Z (%) min	Tensile Strength Rm (MPa) max	Min. Reduction of Area Z (%) min	Tensile Strength Rm (MPa) max	Min. Reduction of Area Z (%) min	Tensile Strength Rm (MPa) max	Min. Reduction of Area Z (%) min	Tensile Strength Rm (MPa) max	Min. Reduction of Area Z (%) min
2≤d≤5	PropertyProduction MethodValue										Untreadted (+U) or Untreadted + Peeled (+U +PE)-	Untreadted (+U) or Untreadted + Peeled (+U +PE)-	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)-	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)-	Cold Drawn (+U +C)-	Cold Drawn (+U +C)-	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)242	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)73	Spheroidized + Cold Drawn (+AC +C)-	Spheroidized + Cold Drawn (+AC +C)-
5<d≤10	PropertyProduction MethodValue										Untreadted (+U) or Untreadted + Peeled (+U +PE)390	Untreadted (+U) or Untreadted + Peeled (+U +PE)70	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)330	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)75	Cold Drawn (+U +C)470	Cold Drawn (+U +C)66	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)238	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)73	Spheroidized + Cold Drawn (+AC +C)410	Spheroidized + Cold Drawn (+AC +C)70
10<d≤40	PropertyProduction MethodValue										Untreadted (+U) or Untreadted + Peeled (+U +PE)390	Untreadted (+U) or Untreadted + Peeled (+U +PE)70	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)330	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)75	Cold Drawn (+U +C)460	Cold Drawn (+U +C)66	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)222	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)73	Spheroidized + Cold Drawn (+AC +C)400	Spheroidized + Cold Drawn (+AC +C)70
40<d≤100	PropertyProduction MethodValue										Untreadted (+U) or Untreadted + Peeled (+U +PE)390	Untreadted (+U) or Untreadted + Peeled (+U +PE)70	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)330	Spheroidized (+AC) or as Treated + Peeled (+AC +PE)75	Cold Drawn (+U +C)-	Cold Drawn (+U +C)-	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)184	Cold Drawn + Spheroidized + Skin Passed (+U +C +AC + LC)-	Spheroidized + Cold Drawn (+AC +C)-	Spheroidized + Cold Drawn (+AC +C)-

Working Temperatures Recommended

Working Temperatures Recommended
Operation	Temperature
Hot forgings deformation	800-1100 °C
Soft annealing	650-700 °C

Published: 01 January 2025 | Last Updated: 08 June 2026

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