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DAIDO Mould Steel



Plastic and Application

DAIDO
BRAND

 Usual 
Hardness

Rating For

*1 *2 *3 *4 *5 *6 *7
 Thermo
 Plastics		  General

General Uses

 PXZ

 27-34HS

 A C B A C B C

Long Life Uses 

 PDS3 26-30HRC B C B A C B B
PX4 30-33HRC B B A A B B B
PX5 30-33HRC A B A A B B B

Mirror Polishing
Uses

 NAK55 37-43HRC A B A A B C B
NAK80 37-43HRC B A A A B C B
PAK90 30-34HRC B A A B B A B
MASIC 50-54HRC B A A A A A A
  Glass Reinforcement Uses DH2F 38-42HRC A B B B B B B
 Thermosetting
 Plastics

Corrosive
Resistant Uses 

 S-STAR 53-57HRC C A A C A B  A
G-STAR 37-43HRC A B B A B A B

   General　Uses

 NAK55 37-43HRC A B A A B C B
DH2F 38-42HRC A B B B B B B
DC11,DC53 56-62HRC C A A C A C A
 *1 Machinability, *2 Mirror Surface, *3 Photo etching, *4 Weld ability, *5 Wear Resistance
 *6 Strength, *7 Corrosion Resistance 
Application

Forged Products for Plastic Mold

Forged Products for Plastic Mold

Chemical Composition
 DAIDO 
 BRAND

Chemical Composition (%)

Condition

C Si Mn Ni Cr Mo

Other Elements 

PXZ

(Patent Pending)

 Tempered
PDS3

0.45

0.2

 0.9 - 1.1 0.25

-

PX4

(Patent Pending)

PX5

(Patent Pending)

NAK55 0.15 0.3 1.5 3.0 - 0.3

Cu 1.0, Al 1.0, S 0.1

 Aged
NAK80 0.15 0.3 1.5 3.0 - 0.3

Cu 1.0, Al 1.0

S-STAR 0.35 0.8 0.5 - 13.5 0.6

-

 Tempered
MASIC 0.03 max. 0.10 max. 0.10 max. 18.5 - 5.0

Co 9.0, Ti 0.6

 Solution Treated
G-STAR 0.35 - - - 16.0 1.0

S 0.1

 Tempered
Mirror Finish Properties
Mirror Finish Properties