DURO-V5

Special steel for cold working precise die and mold

DURO-V5

Well balanced steel in high wear
resistance and high toughness!!

Better

DURO-V5 is made by using NACHI's original
steel manufacturing and refining technologies. Itcombines the toughness of Matrix HSS with thewear resistance that is higher than SKH51 (M2).
L High purification reduces levels of non-metallic
inclusions for super toughness and great fatigue
strength
L Carbide volume and size are the best controlled toget superior balance of toughness and wear
resistance.

DURO Series

V2Toughness

F1

V5F3, F7
PM HSS* Matrix HSS

SKH51 (M2)
SKD11 (D2)SPHSS

Die and mold steel

BetterWear resistance* Matrix HSS: Tough HSS grades with less carbides.

Features
Applications
Cold working
die and mold steel

FeaturesHardness (HRC)

L Higher wear resistance than Matrix HSS or SKH51 (M2).
L Good toughness like Matrix HSS and higher than SKH51 (M2).
L Well balanced wear resistance and toughness in the range of 60 to 62 HRC.

56 ~ 62

Applications
L Fine-blanking die for hard-workable materials like high-tensile
steel sheets
L Thin round punch which requires toughness
L Thin or complex shape blanking punch which requires toughness

L Die and mold for cold forging
L Mandrel for flow-forming process

Heat treatment conditions
Recommended heat treatment conditions
QuenchingTempering

Hardness

(°C)

(°C)

(HRC)

[For toughness]
1140

580 × 2 times

60.0[Standard]
1160

560 × 2 times

62.0

Heat treatment hardness (HRC)

Hardness chart
66
64
62

Quenchingtemperature
1160°C
1140°C1120°C
1100°C
1080°C60
5856* Hardness may be 2 HRC lower than this chart if you use vacuum furnace.

54AsQ540560580600

Tempering temperature (°C)

DURO-V5

Special steel for cold working precise die and moldMechanical properties
Wear resistance
50.20
Ogoshi wear tester
Rotor: SCM435
Distance: 200 m
Final load: 6.3 kg

Wear ratio (mm3/kgfvm)

40.15

SKH51 (M2)(62 HRC)

Distortion (%)×10-4

Dimensional change after heat treatment

3Matrix HSS(60 HRC)
2

Axial
direction

0.10
Radialdirection
0.05

0.00

1−0.05

DURO-V5(60 HRC)
Better 0012

3−0.10

4AsQFriction speed (m/s)

540560Bending fracture strength120

DURO-V5
DURO-V55.0
Matrix HSS

3-point bend
Span: 50 mm

4.8

4.6

SKH51 (M2)
4.480
Matrix HSS
6040
SKH51 (M2)20

SKH51 (M2)60

No notch sample
Sample size: 5 x 10100

Charpy impact value (J/cm2)

Bending fracture strength (GPa)600

Impact value

5.2

4.2580Tempering temperature (°C)

61

62060

63

Hardness (HRC)

616263Hardness (HRC)

Production Range
Round Bar
Square Bar/Flat Bar

Max 240 mm dia.
Max 200 × 200 mm* Detail information about size will be suggested by Nachi sales staffs.

Unauthorized reproduction of these materials is prohibited.
L Information in this catalog may be changed without prior notice due to technical advancements or product developments. While care has beentaken to produce these materials, NACHI Fujikoshi accepts no responsibility for damages caused by misprints or omissions that may occur during
the publication of this catalog.
L Please note that the characteristics and values provided here are typical examples which may differ from the characteristics of the actual product.

Tokyo Head Office
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