16NiCrS4

General Information

16NiCrS4 is an case hardening steel with good dimension stability, high toughness and improved machinability.

Ovako 146S is an ingot cast steel. The chemical composition is well controlled to give the steel a controlled hardenability towards the high end (HH). It has reduced silicon content for reduced propensity for internal oxidation during carburizing. Regulated sulphur content ensures good machinability properties.

4730 is an contious cast steel. The chemical composition is well controlled to give the steel a controlled hardenability towards the low end (HL). For improved machinability this steel is processed according to our M-Steel concept.

M-Steel®

The basis for the concept is that non-metallic inclusions are modified and controlled with calcium treatment in a way to minimize tool wear and to maximize chip control in machining operations. Our M-Steel treatment can be applied to any steel grade.

Similar designations

SS 2511, 16NCD5 (AFNOR), 637 A 16 (BS), 16NC6 (AFNOR), BS 637M17 M

Variant	Cast	Weldability		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %	Cu %
146S	IC	CEV 0.81_max	Min	0.13	0.05	0.70	-	0.035	0.60	0.80	0.05	-
Pcm 0.4_max	Max	0.25	0.15	1.10	0.025	0.050	1.20	1.40	0.20	-
4730	CC	CEV _max	Min	0.13	0.10	0.70	0.000	0.010	0.60	0.80	-	-
Pcm _max	Max	0.19	0.25	1.00	0.035	0.040	1.00	1.10	-	-
EN ISO 683-3 16NiCrS4	Std	CEV 0.67_max	Min	0.13	0.15	0.70	-	0.020	0.60	0.80	-	-
Pcm 0.33_max	Max	0.19	0.40	1.00	0.025	0.040	1.00	1.10	-	0.40

Variant

Cast

Weldability

C %

Si %

Mn %

P %

S %

Cr %

Ni %

Mo %

Cu %

146S

CEV 0.81_max

Min

0.13

0.05

0.70

0.035

0.60

0.80

0.05

Pcm 0.4_max

Max

0.25

0.15

1.10

0.025

0.050

1.20

1.40

0.20

4730

CEV _max

Min

0.13

0.10

0.70

0.000

0.010

0.60

0.80

Pcm _max

Max

0.19

0.25

1.00

0.035

0.040

1.00

1.10

EN ISO 683-3 16NiCrS4

Std

CEV 0.67_max

Min

0.13

0.15

0.70

0.020

0.60

0.80

Pcm 0.33_max

Max

0.19

0.40

1.00

0.025

0.040

1.00

1.10

0.40

Variant	Condition	Format	Dimension [mm]	Yield strength min [MPa]	Tensile strength [MPa]	Elongation A₅ [%]	Hardness
Rp_0.2 * R_eh, ** R_el
146S	+U	Round bar	24 < 190	650*	840 typical	15	260 HB typical
+A	Round bar	24 < 190	-	-	-	170 HB typical
+Q	Round bar	< 30	490*	800-1200	8	260-380 HB
4730	+AR	Round bar	25 < 160	-	-	-	< 250 HB

Variant

Condition

Format

Dimension [mm]

Yield strength min [MPa]

Tensile strength [MPa]

Elongation A₅ [%]

Hardness

Rp_0.2 * R_eh, ** R_el

146S

Round bar

24 < 190

650*

840 typical

260 HB typical

Round bar

24 < 190

170 HB typical

Round bar

< 30

490*

800-1200

260-380 HB

4730

+AR

Round bar

25 < 160

< 250 HB

	Temperature °C
AC1	714
AC3	799

Temperature °C

AC1

714

AC3

799

Treatment	Condition	Temperature cycle	Cooling/quenching
Hot forging	+AR	Soaking at 800 - 1200^oC	In air
Normalizing	+N	860 - 890^oC	In air
Soft annealing	+A	600 - 670^oC / 2h	In air
Quenching	+Q	Hardening temperature 840 - 890^oC	In oil
Carburizing	+Q	Hardening as carburized soaking 780 - 830^oC	In oil
Tempering	+QT	Soaking at 160 - 250^oC 1hr	In air

Treatment

Condition

Temperature cycle

Cooling/quenching

Hot forging

+AR

Soaking at 800 - 1200^oC

In air

Normalizing

860 - 890^oC

In air

Soft annealing

600 - 670^oC / 2h

In air

Quenching

Hardening temperature 840 - 890^oC

In oil

Carburizing

Hardening as carburized soaking 780 - 830^oC

In oil

Tempering

+QT

Soaking at 160 - 250^oC 1hr

In air

Micro inclusions		Macro inclusions
Applied standard	ASTM E45	Applied standard	ISO 3763 (Blue fracture)
Sampling	ASTM A295	Sampling	Statistical testing on billets
Maximum average limits	A	B	C	D	Limits	< 5 mm/dm²
Th	He	Th	He	Th	He	Th	He
2,5	1,5	1,0	0,5	0	0	0,5	0,5

Micro inclusions

Macro inclusions

Applied standard

ASTM E45

Applied standard

ISO 3763

(Blue fracture)

Sampling

ASTM A295

Sampling

Statistical testing on billets

Maximum average

limits

Limits

< 5 mm/dm²

2,5

1,5

1,0

0,5

Steel works	Hofors	Smedjebacken	Imatra
CO2e/kg	120	62	76

Steel works

Hofors

Smedjebacken

Imatra

CO2e/kg

120

Steel Grade	Format	Condition	Scope 1-3 (CO2e kg /1000 kg steel)	Climate compensated Net emission = Scope 3 (CO2e kg /1000 kg steel) Scope 1 - 2 = 0 (compensated)
146S	Round bar	+AR	795	396
146S	Round bar	+FP	800	399
146S	Tube,wall	+AR	833	436
146S	Tube,wall	+FP	836	438
4730	Round bar	+AR	649	345

Steel Grade

Format

Condition

Scope 1-3 (CO2e kg /1000 kg steel)

Climate compensated Net emission = Scope 3 (CO2e kg /1000 kg steel) Scope 1 - 2 = 0 (compensated)

146S

Round bar

+AR

795

396

146S

Round bar

+FP

800

399

146S

Tube,wall

+AR

833

436

146S

Tube,wall

+FP

836

438

4730

Round bar

+AR

649

345

Youngs module (GPa)	Poisson´s ratio (-)	Shear module (GPa)	Density (kg/m3)
210	0.3	80	7800
Average CTE 20-300°C (µm/m°K)	Specific heat capacity 50/100°C (J/kg°K)	Thermal conductivity Ambient temperature (W/m°K)	Electrical resistivityAmbient temperature (µΩm)
12	460 - 480	40 - 45	0.20 - 0.25

Youngs module (GPa)

Poisson´s ratio (-)

Shear module (GPa)

Density (kg/m3)

210

0.3

7800

Average CTE 20-300°C (µm/m°K)

Specific heat capacity 50/100°C (J/kg°K)

Thermal conductivity Ambient temperature (W/m°K)

Electrical resistivityAmbient temperature (µΩm)

460 - 480

40 - 45

0.20 - 0.25

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Material data sheet

Steel grade

16NiCrS4

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat treatment recommendations

Heat Treatment Guide generated Graphs

Hardenability

Heat treatment

Carburizing response

CCT

Tempering response

Fatigue properties

Steel cleanliness

SUSTAINABILITY-ENVIRONMENTAL IMPACT DATA

Other properties (typical values)

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