40NiCrMo7-3

General Information

40NiCrMo7-3 is a quench and tempering steel with high toughness. Used for large axles, machine componenets etc. that require high tensile strength and high toughness. Can be flame or induction hardened.

6514 is a conti cast grade intended for ASTM A320 L43 fasteners in low-temperature service.

355B is ingot cast too and inside the SAE 4340 specification but is slightly enhanced with Vanadium for improved tempering resistance.

355E is an ingot cast grade specially designed to comply with API 20E BSL3 L43 fasteners

Both 355B and 355E have a low controlled sulphur content for high sulphidic cleanliness and Oxygen content is kept low for high oxidic cleanliness. Giving that both follow the Ovako Bearing Quality cleanliness (BQ).

Delivered in as-rolled, soft annealed, normalized or quench and tempered condition

BQ-Steel®
BQ-Steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the bearing industry.

Similar designations

AISI 4340

Variant	Cast	Di	Weldability		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %	V %
6514	CC	3.75	CEV _max	Min	0.38	0.15	0.60	-	-	0.70	1.65	0.20	-
Pcm _max	Max	0.43	0.35	0.85	0.035	0.040	0.90	2.00	0.30	-
355B	IC		CEV 0.99_max	Min	0.38	0.15	0.65	-	0.004	0.70	1.65	0.20	0.080
Pcm 0.61_max	Max	0.43	0.35	0.85	0.015	0.008	0.90	2.00	0.30	0.120
355E	IC		CEV _max	Min	0.39	0.20	0.70	-	-	0.80	1.78	0.25	-
Pcm _max	Max	0.43	0.29	0.80	0.015	0.005	0.90	2.00	0.30	-

Variant

Cast

Weldability

C %

Si %

Mn %

P %

S %

Cr %

Ni %

Mo %

V %

6514

3.75

CEV _max

Min

0.38

0.15

0.60

0.70

1.65

0.20

Pcm _max

Max

0.43

0.35

0.85

0.035

0.040

0.90

2.00

0.30

355B

CEV 0.99_max

Min

0.38

0.15

0.65

0.004

0.70

1.65

0.20

0.080

Pcm 0.61_max

Max

0.43

0.35

0.85

0.015

0.008

0.90

2.00

0.30

0.120

355E

CEV _max

Min

0.39

0.20

0.70

0.80

1.78

0.25

Pcm _max

Max

0.43

0.29

0.80

0.015

0.005

0.90

2.00

0.30

Variant	Condition	Format	Dimension [mm]	Yield strength min [MPa]	Tensile strength [MPa]	Elongation A₅ [%]	Reduction of area Z_min [%]	Impact (ISO-V) strength_min
Rp_0.2 * R_eh, ** R_el
6514	+QT	Round bar	25 < 130	725*	> 860	16	50	-101 °C 27 J (long)

Variant

Condition

Format

Dimension [mm]

Yield strength min [MPa]

Tensile strength [MPa]

Elongation A₅ [%]

Reduction of area Z_min [%]

Impact (ISO-V) strength_min

Rp_0.2 * R_eh, ** R_el

6514

+QT

Round bar

25 < 130

725*

> 860

-101 °C 27 J (long)

	Temperature °C
MS	296
AC1	707
AC3	768

Temperature °C

296

AC1

707

AC3

768

Micro inclusions steel grade 355B		Macro inclusions steel grade 355B
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	< 2,5 mm/dm²
Th	He	Th	He	Th	He	Th	He
2,0	1,5	0,8	0,1	0	0	0,5	0,4

Micro inclusions steel grade 355B

Macro inclusions steel grade 355B

Applied standard

ASTM E45

Applied standard

ISO 3763

(Blue fracture)

Sampling

ASTM A295

Sampling

Statistical testing on billets

Maximum average

limits

Limits

< 2,5 mm/dm²

2,0

1,5

0,8

0,1

0,5

0,4

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)
355B	Round bar	+AR	885	486
355B	Round bar	+SA	891	490
355B	Tube,wall	+AR	931	533
355B	Tube,wall	+SA	933	536
ASTM A320 L43, 6514	Round bar	+AR	739	458
ASTM A320 L43, 6514	Round bar	+QT	1036	549

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)

355B

Round bar

+AR

885

486

355B

Round bar

+SA

891

490

355B

Tube,wall

+AR

931

533

355B

Tube,wall

+SA

933

536

ASTM A320 L43, 6514

Round bar

+AR

739

458

ASTM A320 L43, 6514

Round bar

+QT

1036

549

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

40NiCrMo7-3

General Information

Similar designations

Chemical composition

Mechanical Properties

Transformation temperatures

Heat Treatment Guide generated Graphs

Steel cleanliness

SUSTAINABILITY-ENVIRONMENTAL IMPACT DATA

Other properties (typical values)

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