EDRO - Specialty Steels #17

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EDRO #2^™Prehardened 4130 Holder Block

General

Properties

EDRO #2^™ is a vacuum-degassed Chromium-Molybdenum-alloyed steel which is supplied in the hardened and tempered condition. EDRO #2^™ is characterized by:

Excellent machinability
Good resistance to indentation
Uniform hardness in all dimensions

Applications

Holders/bolsters for plastic molds and die-casting dies
Plastics and rubber molds with low requirements on polishability
Support plates
Constructional parts

Impact strength

Approx. values. Samples taken from a round bar 1" (25 mm) diameter. Hardness: 310 HB.

Testing temperature	68°F (20°C)	390°F (200°C)	750°F (400°C)
Joules Ft. lbs.	50 37	55 41	65 53

Tensile strength

Approx. values. Samples taken from a round bar 1" (25 mm) diameter. Hardness: 310 HB.

Testing temperature	68°F (20°C)	390°F (200°C)	750°F (400°C)
Tensile strength psi N/mm²	146,000 1010	138,000 950	115,000 790
Yield strength psi N/mm²	116,000 800	109,000 750	91,000 630
Reduct. in area	50%	52%	54%
Elongation in 2"	18%	20%	23%

Heat Treatment

Machining

EDRO #2^™ is intended for use in the hardened and tempered condition, i.e. the delivery condition.

Flame and induction hardening

EDRO #2^™ can be flame or induction hardened to a hardness of 50 RC. Cooling in air is preferable. Smaller pieces may, however, require forced colling. Hardening should be immediately followed by tempering.

Nitriding

Gas Nitriding

Nitriting gives a hard surface which is a very resistant to wear and erosion. A nitrided surface also increases the corrosion resistance. The surface hardness after nitriding at a temperature of 980°F, 525°C in ammonia gas will be approx. 650 HV.

Nitriding
temperature

°F

°C

Nitriding
time
hours

Depth of case
approx.

in.

980
980
980

525
525
525

20
30
60

0.012
0.014
0.020

0.30
0.35
0.50

Tufftriding (Tenifer process)

Tufftriding at 570°C, 1025°F will give a surface hardness of approx. 700 HV. After 2 hours treatment, the hard layer will be approx. 0.0004 in., (0.01 mm).

Milling

Carbide tools and high speed steel tools

Rough milling

Finish milling

Depth of cut (t) in
mm

min. 0.08
min. 2

max. 0.08
max. 2

Feed (s) in/tooth
mm/tooth

min. 0.08
min. 2

max. 0.08
max. 2

ISO machining group
Cutting speed (v) f.p.m.
m/min

Carbide tools

P30-P40

230-330

70-100

P10-P20

295-380

90-115

Cutting speed (v) f.p.m.
m/min

High speed steel tools

50-100

15-30

65-115

20-35

Drilling

Diam-
eter
in./mm

Depth of Hole

0.16/4

rpm/feed (rev./mm/in.)

0.16/4

1720

.08
.003

1435

.08
.003

1310

.05
.002

1190

.04
.002

0.32/8

1080

.14
.006

900

.11
.004

820

.08
.003

740

.07
.003

0.64/16

570

.25
.010

475

.19
.008

435

.15
.006

395

.12
.005

1.0/25

370

.29
.012

310

.22
.009

285

.17
.007

360

.15
.006

Chip removal is recommended when depth of hole is > 4 x D. Flush cooling is to be used.

Welding

The following procedure is recommended when welding EDRO #2^™

1. Heat part to approx. 400-500°F, 200-260°C

2. Weld part

3. Stress relieve at 750-930°F, 400-500°C

Electrode: Chromium-Molybdenum alloyed basic electrodes for welding of structural steels.

Note: Use a well dried basic electrode. Welding may also be performed with an austenitic stainless steel electrode. In this case this stipulated increased working temperature may be modified, but the weld metal has a lower strength (hardness) than the parent material.


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