SLDi

June 2016

Hitachi Metals America

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2 | Hitachi Metals America, LLC | All rights reserved |

1.1 Sheet Metals Trends

IF

200 400 600 800 1000 1200 1400 1600 0

10

20

30

40

50

60

70

Elo

ng

ati

on

(%

)

Tensile Strength MPa

Cast Iron S7 / A2 / D2 Advanced Grade / Hot Stamp

~1995

1995~2000

2000~2015

2015~

AHSS use is increasing due to automotive light-weighting. Advanced

die grades are needed to form AHSS.

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1.2 Tool Steel Bubble Chart

SLD-i™

D2

A2

S7

8%Cr steel

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Grade Chemical composition (wt％)

C Si Mn Cr Mo V Others

D2 1.40-

1.60

0.30-

0.50

0.30-

0.50

11.0-

13.0

0.70-

1.20

0.50-

1.10 -

SLD-i™ Within the D2 spec (stricter) -

8%Cr Steel* 1.0 1.0 0.4 8 2 0.3 -

SLD-MAGIC® Same as

8%Cr Steel

Same as

8%Cr Steel

Same as

8%Cr Steel

Same as

8%Cr Steel

Lower than

8%Cr Steel

Lower than

8%Cr Steel Addition

*Chemical composition of 8%Cr Steel has a variety by steel maker

2.1 Chemical Composition

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2.2 Microstructure 8%Cr Steel SLD-i™ D2

Small, dense & homogeneous

carbide distribution will

contribute to

• Small & isotropic heat

treatment deformation

• Good galling & wear

resistance

Coarse & directional carbide

distribution

• Large & anisotropic heat

treatment deformation

• Medium galling & wear

resistance

• Characteristics will be

affected by grain direction

Small & sparse carbide

distribution

• Large heat treatment

deformation

• Low galling & wear

resistance

• Good toughness &

machinability

200μm 200μm 200μm

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2.3 Heat Treatment Condition

Tempering curve Retained austenite

If γR is less than

5%, secular

change risk will be

minimized.

*Quenching:1030C (1886F)

SLD-i

D2

Hard

ness

Tempering temperature ℃ x2hr x 2 times Tempering temperature ℃ x 2hr x 2 times

Maximum

hardness at 500C

(932F) temper.

Compared to D2, SLD-i is capable of an equal or greater hardness with the same

heat treatment.

500oC (932oF) tempering temperature maximizes SLD-i performance due to;

Obtaining maximum hardness (over 60 HRC).

Lowering γR below 5% (minimize secular change risk).

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2.4 Heat Treatment Deformation

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

SLD-i D2

Dim

en

sio

na

l C

ha

ng

e (

%)

Length

Width

Specimen size：

18Tx25Wx30L(mm)

Austenitizing:

1030oC

Tempering:

500oC 2h+2h

Good

Poor

Grade Chemical composition (wt％)

C Si Mn Cr Mo V

D2 1.40-

1.60

0.30-

0.50

0.30-

0.50

11.0-

13.0

0.70-

1.20

0.50-

1.10

SLD-i Within the D2 spec

Reference: Chemical composition of SLD-i is within the D2 spec

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3.1 Case Study Punch dies for burring hub bearings

Spec 73.86±0.01 mm

SLD-i Sample 1 73.863 mm

Sample 2 73.856 mm

Sample 3 73.859 mm

Sample 4 73.867 mm

Sample 5 73.859 mm

Pass rate 100% (5/5)

Pass rate of D2 10% OD: 75mm

Application Grade Coating Die life

Punch dies

for burring

SLD-i™ TD coated More than 500,000 hits

WITHOUT repairing

D2 TD coated 10,000 – 100,000 hits with

repairing

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3.2 Case Study Shear Tool for 1500 MPa

Application Grade Hardness Coating Die life before re-

sharpening

Shear Tool SLD-i™ 60~62 HRC Bare surface 75,000 ~ 100,000 cuts

D2 60~62 HRC Bare surface 10,000 ~ 15,000 cuts

Application Cross Member

Floor Panel Part

Thickness 1.5 mm

Hardness 52 HRC

Strength 1500 MPa

Failure mode of dies Wear/Galling

Material information

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Item Condition

Test

piece

Grade

D2, SLD-i,

SLD-Magic

and 8Cr

Hardness 60HRC

Disc Alumina

Surface pressure 7.8 MPa

Friction Speed 0.42 m/sec

Friction length 377 m

<Conditions> <Results>

Good

Poor

ASTM G99-05

TP Disc 0

1

2

3

4

5

6

7

8

9

D2 SLD-i 8%Cr SLD-MAGIC

Wea

r V

olu

me

(x 1

0-1

4m

2／

N)

SLD-i™ SLD-MAGIC® 8%Cr Steel

Increase carbide

amount

→Decrease

Wear amount

4.1 Wear Resistance

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Initiation point and

direction of galling

Load

Bead

Punch Die

Work piece

Schematic diagram of test condition

<Results> Item Condition

Length of Stroke 60mm

Pressing Velocity 60spm

Lubricant Rust prevention oil

*delivery condition

Work 980MPa HSS

Work Thickness 1.4mm (No Zn plating）

Clearance:5%

Die surface

condition

Polished by #8000 paper

(2-4μm)

<Conditions>

0

500

1000

1500

2000

2500

3000

3500

D2 SLD-i 8%Cr SLD-MAGIC

Hold

ing P

ressure

(kg・f)

SLD-i™ SLD-MAGIC ® 8%Cr Steel

4.2 Galling Resistance

THANK YOU