¨¨ A.  Finkl & Sons Co.
MOLD DIE STEEL
DATA SHEET
Mold Die®                         
         Cleanest...Toughest...Most Machinable
   Available only by Patented* Vacuum Arc Refining
A Finkl & Sons Co One Finkl Plaza
(2011 N Southport Ave.)
Chicago, IL 60614-4079
Phone: 773/975-2510
FAX 773/348-5347
Toll free phone: 
1-800-DIE-BLOCK
PRODUCT WARRANTY
The material herein merely constitutes instructions furnished gratuitously for your consideration. These instructions are intended as suggestions only and do not purport to be complete or to
replace or to constitute normal shop practices.  A. Finkl & Sons Co. makes no representation or warranty of any kind, express or implied with respect to the matters covered herein, whether
as to merchantability, fitness for a particular purpose, reproducibility of properties and results set out herein, or any other matter.
EXCLUSION OF WARRANTIES-THE IMPLIED WARRANTIES OF MERCHANTABILITYAND FITNESS FOR ANY PURPOSE ARE EXCLUDED.

Mold Die Chemistry
Carbon                 0.33      Manganese               0.80
Silicon                  0.45      Nickel                        0.40
Chromium            1.80      Molybdenum             0.45
APPLICATION: Mold Steel for plastic molds, zinc die
casting dies, and other materials.

Supplied in the pre-hardened condition, approximately
300 Brinel l ,   for  inject ion Plast ic molds and zinc die cast ing dies.
Higher hardness, approximately 330 Brinel, is immediately
available in certain stcoked sizes and always available on
a custom-order basis. Mold Die can also be supplied in
the annealed condition.
Mold Die is produced exclusively by the Finkl patented*
VAD process and provides the cleanest, most homogeneous
structure available, giving maximum machinability
and polishability in the industry.
* Produced under one or more of the following
patents: 4,541,862;4,600,427; others pending
Full service metallurgical expertise is available upon 
request.  Mold Die is ALWAYS forged steel from upset 
ingots with a minimum 5-to-1 reduction of area.
Mold Die is 100% ultrasonically tested to the most rigid industry
standards and is fully warranted and approved by all
major users.Mold Die Physical and Machining Pr operties
68 Joules
50 ft-lbs
75 Joules
55 ft-lbs
81 Joules
60 ft-lbs
Rc
BHN
Grade Mold Die
30.48 cm (12-inch) Thick Mold Steel—Physical Properties
Test
Location
Sub-
Surface
Quarter
Thickness
Center
Tensile
Strength
1041
151,000
1041
151,000
1034
150,000
Yield
Strength
883
128,000
876
127,000
862
125,000
20.8
20.2
19.8
62.2
60.1
60.0
32
302
32
302
32
302
Charpy V-Notch
Fracture
MPa/psi 20°C/68°F
% Elong.
in
% RA
1.28 cm
(.505”)
MPa/psi
5.08 cm (2”)
Tempering Temperature
°F 800 900 1000 1100 1200 1300
psi
230
220
200
180
160
140
120
100
80
60
40
20
Physical Properties
MD
Longitudinal Tensile Properties
Tensile Strength
70%
60%
50%
40%
30%
20%
10%
Yield Strength
Reduction of Area
Elongation
°C (427) (482) (538) (593) (649) (704)
MPa
(1586)
(1517)
(1379)
(1241)
(1103)
(965)
(827)
(689)
(552)
(414)
(276)
(138)
°F –200 –100 0 +100 +200 +300 +400 +500
108
95
81
68
54
41
27
14
Joules
                      
MD
Impact Strength @ 32 HRc
Charpy V-Notch
Longitudinal
Transverse
80
70
60
50
40
30
20
10
. ft-lbs
°C (–129) (–73) (–17.8) (+38) (+93) (+149) (+204) (+260)
2Mo
1.75
1.50
1.25
Mo
.75
.50
.25
0 0.6 0.7 0.8 0.9 Ho 1.1 1.2 1.3 1.4 1.5
Machinability vs. Hardness
Relative Hardness, H
x = 1.5
x = Experimentally
Determined Constant
M =  (   )
x   
 
Tool Life
BHN Machinability H.S. Carbide
229 (Annealed) +40% +13x 3.5x
255 +12% 2x 1.4x
285 Mo To Toc
311 –14% –48% –28%
341 –24% –66% –42%
375 –33% –75% –51%
                                       
0 .2Vo .4Vo .6Vo .8Vo V o 1.2Vo 1.4Vo 1.6Vo 1.8Vo 2.0
3To
2.8
2.6
2.4
2.2
2To
1.8
1.6
1.4
1.2
To
0.8
0.6
0.4
0.2
Relative Cutting Speed
Tool Life vs. Cutting Speed
T= Tool Life
V = Cutting Speed
n1 C= Constants
T =  (  )
1/n 
 
Taylor's Equation
n = 0.4 Carbide tooling
n = 0.2
High-speed tooling
Engineering Data—Mold Die
Testing Temperature 20°C/68°F 200°C/390°F 400°C/750°F
Density  Kg/m3 7800 7750 7700
lbs/in3 .282 .280 .277
Coefficient of Thermal
Expansion
/°C 11.9 x 10-6 12.7 x 10-6 13.6 x 10-6
/°F 6.6 x 10-6
7.0 x 10-6
7.5 x 10-6
Thermal Conductivity
W/m °C 29.0 29.5 31.0
BTU in/ft
2
h°F 202 205 216
Modulus of Elasticity
MPa 205 x 103 200 x 103 185 x 103
psi 29.7 x 106 29.0 x 106 26.8 x 106
Specific Heat
Joules/Kg°C 460
BTU/lb °F .110
HRC 24 28 31 34 38
HB 248 269 293 321 352
Speed Surface
Meters/Minute 85 76 67 58 50
Feet/Minute 280 250 220 190 165
cm. inches
2.54 1 1070 950 840 725 630
5.08 2 535 480 420 365 315
7.62 3 355 315 280 240 210
10.16 4 270 240 210 180 160
12.70 5 215 190 170 145 125
Suggested Cutter Speeds for Mold Die Steel (RPM)
Diameter
of
Cutter
Hardness Level