BISPLATE ALLOY Technical-Guide-Armour
BISPLATE ALLOY Technical-Guide-Armour
BISPLATE ALLOY Technical-Guide-Armour
02 | BISALLOY® is a registered trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
BISALLOY® ARMOUR WELDING
RECOMMENDATIONS
75mm
04 | BISALLOY® is a registered trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
TACK WELDING and toughness and reduce the susceptibility to cracking in
the weld joints. The recommended consumables are listed in
Tack welds require special care due to the abnormal Table 3 below.
stresses and high cooling rates experienced by the adjacent
material. The same preheat/heat input requirements should Table 3: Recommended AS and AWS classified consumables for
be employed for final welding and lower strength welding welding of armour plate
consumables considered. When welding under high restraint WELDING STRENGTH AS AWS
conditions consideration should be given to the use of longer PROCESS LEVEL CLASSIFICATION CLASSIFICATION
tack welds (>50mm) and lower strength consumables with MMAW Lower E55XX. E49XX E80XX, E70XX
high ductility. ER80S-X,
GMAW Lower G55XX, G49XX
ER70S-X
WELDING PRACTICE
Note:
Good fillet welding techniques are important in welding 1. Consumables listed in Table 3 are ferritic. Austenitic
BISALLOY® Armour steel plates because often very high consumables may be used under high restraint welding
stresses are applied in service. It is essential that welds have conditions that require higher levels of ductility and toughness
good root penetration, be smooth, correctly contoured and in the weldment or when the structure is subject to high levels
well flared into the legs of the joined pieces. of fatigue loading (such as in armoured vehicle). E308Mo
or 307/19.9.6Mn have been successfully used to fabricate
A good fit between the work pieces is essential to minimise
armoured vehicles. E308L and E309L are also acceptable for
stresses and thereby the risk of cracking.
certain applications.
All contaminants on and near weld joints such as mill scale, 2. Table 3 only shows the classification of consumable.
oil, paint and moisture should be removed before welding. 3. End users/fabricators should consult consumable
manufacturers to choose the most suitable ferritic or
SELECTION OF CONSUMABLES austentic consumable for their application.
ABRASIVE WATER JET CUTTING Uncontrolled flame cutting of BISALLOY® Armour HHA500
and UHH600 steel may result in hydrogen cold cracking.
Abrasive water jet cutting can be applied to all The thicker the plate, the higher the sensitivity to cracking.
BISALLOY® Armour steel plates and is the preferred method The most effective way to minimize cracking during and after
because the absence of HAZ eliminates the risk of cracking, cutting is to preheat the plate and keep the cut parts at an
particularly for BISALLOY® Armour UHH600 steel. elevated temperature. (see Table 5 below).
06 | BISALLOY® is a registered trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
DISTORTION AFTER CUTTING
BISALLOY® Armour HHA500, VHH550 and UHH600 have very
high hardnesses and may contain high residual stresses.
It is recommended that the following practices be used to
minimise distorting after cutting:
BENDING BISALLOY® Armour steel plate, like all hot rolled plate,
displays slightly different mechanical properties in the
All BISALLOY® Armour steel grades can be cold bent by direction of rolling compared to the transverse direction. It is
the brake press-bending method as shown in Figure 1. recommended that where possible the bend axis be at right
Plate rolling techniques can also be employed. However, angles to the plate rolling direction (transverse bending) as
BISALLOY® Armour steel grades have higher hardness shown in Figure 2.
and strength levels compared to plain carbon steels and
therefore suitable consideration of sufficient machine power,
plate bending direction and former radii (R) must be made.
BISALLOY® Armour steel plates should be bent at room
temperature to avoid reduction of mechanical and
ballistic properties.
a) Transverse bending
Bending axis
Rolling direction
08 | BISALLOY® is a registered trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
FORMER
The minimum former radius (R) related to plate thickness (t) for all BISALLOY® Armour steel grades are listed in Table 6.
50 250 - 250 - - -
Note Table 6
1. Bending should be conducted at room temperature. All Table 7: Die open (W) / thickness (t) for bending armour plates
BISALLOY® Armour steel plates should not be bent at temperatures
BISALLOY® ARMOUR TRANSVERSE LONGITUDINAL
above 200°C. Bending BISALLOY® Armour steel plate at low
GRADE BEND (W/t) BEND (W/t)
temperatures (<10°C), requires an increase in former radii of 50%
minimum. BISALLOY® Armour
RHA300, RHA360, 16 18
2. When bending using these minimum former radii, the flame cut HTA400 steel
hardened edge (heat affected zone 1-2mm) should be removed BISALLOY® Armour
before bending and welded components are not recommended to be 17 19
UHT450 steel
bent using the values in the table. Cut and sheared edges should be
BISALLOY® Armour
ground and rounded with grinder. 18 20
HHA500 steel
3. For best bending results ensure adequate lubrication between the BISALLOY® Armour
plate, die and former. Proper lubrication can reduce bending forces 20 22
UHH600 steel
by 10 to 25%
10 | BISALLOY® is a registered trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
APPROXIMATE FEEDS AND SPEEDS USING
COBALT TYPE HIGH SPEED STEEL DRILLS
Table 8:
PERIPHERAL R.P.M (UPPER FIGURES) AND FEED PER REVOLUTION (mm)
BISALLOY® ARMOUR FOR GIVEN DRILL SIZE HARDNESS
SPEED
STEEL GRADE BRINELL
(m/min) 5 10 15 20 25 30
AS3678-Grade 250 23 1465 735 490 370 295 245
(Mild Steel) ~120
0.10 0.15 0.20 0.25 0.35 0.4
BISALLOY® Armour 12 760 380 250 190 150 130
RHA300 / RHA360 steel 320 (min)
0.07 0.10 0.16 0.23 0.30 0.35
BISALLOY® Armour HTA400 9 570 285 190 150 110 90
steel 370 (min)
0.05 0.10 0.16 0.23 0.30 0.35
BISALLOY® Armour 7 440 220 150 110 90 75
UHT440 steel 420 (min)
0.05 0.09 0.15 0.20 0.25 0.30
DRILL TIP CONFIGURATION USING COBALT Note: This table applies when cobalt type high speed drills are used with a
cutting fluid, if no fluid is used the speeds shown above must be reduced.
TYPE HIGH SPEED STEEL DRILLS
Table 9:
BISALLOY® POINT ANGLE LIP/CLEARANCE
ARMOUR STEEL ANGLE
GRADE
BISALLOY® Armour 125 deg. 7.5 deg.
RHA300 / RHA360
steel
BISALLOY® Armour 150 deg. 5 deg.
HTA400 / UHT440
steel Recommended Drill Tip Configuration for Cobalt Type High Speed Drills
Table 10:
BISALLOY ® ARMOUR SURFACE SPEED FEED RATE
ISCAR INSERT GRADE HARDNESS BRINELL
STEEL GRADE (m/min) (mm/rev)
BISALLOY® Armour IC908 or IC808 120 - 180 0.08 - 0.20 260 – 400
RHA300 / RHA360 steel
BISALLOY® Armour IC908 or IC808 100 - 160 0.06 - 0.18 370 – 430
HTA400 steel
BISALLOY® Armour IC908 or IC808 80 - 100 0.06 - 0.18 420 - 470
UHT440 steel
BISALLOY® Armour IC908 or IC808 70 - 90 0.06 – 0.14 500 (typical)
HHA500 steel
BISALLOY® Armour IC908 or IC808 50 - 70 0.06 – 0.12 600 (typical)
UHH600 steel
ISCAR Australia Pty Ltd. Toll free phone: 1800 806 016 or
email: iscaraus@iscar.com.au
12 | BISALLOY® is a registered trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
COUNTERSINKING AND COUNTERBORING
Table 11:
CUTTING Ø16 Ø20 Ø25 Ø32 Ø40 Ø60
BISALLOY ®
SPEED (m/ FEED FEED FEED FEED FEED FEED
STEEL GRADE RPM RPM RPM RPM RPM RPM
min) (mm/r) (mm/r) (mm/r) (mm/r) (mm/r) (mm/r)
BISALLOY® 25-70 450- 0.10 420- 0.10 330- 0.10 235- 0.10 190- 0.10 130- 0.10
Armour 1200 -0.20 1175 -0.20 930 -0.20 660 -0.20 530 -0.20 390 -0.20
RHA300 /
RHA360 steel
BISALLOY® 20-50 350- 0.10 330- 0.10 260- 0.10 190- 0.10 160- 0.10 105- 0.10
Armour 880 -0.20 840 -0.20 660 -0.20 470 -0.20 380 -0.20 280 -0.20
HTA400 /
UHT440 steel
BISALLOY® 17-45 300- 0.10 280- 0.10 220- 0.10 160- 0.10 130- 0.10 90- 0.10
Armour 860 -0.20 820 -0.20 660 -0.20 470 -0.20 370 -0.20 270 -0.20
HHA500 steel
BISALLOY® 12-40 220- 0.10 200- 0.10 150- 0.10 110- 0.10 90- 0.10 65- 0.10
Armour 700 -0.20 670 -0.20 530 -0.20 370 -0.20 300 -0.20 220 -0.20
UHH600 steel
Table 12:
TAPPING SPEED
BISALLOY ® STEEL GRADE TAP TYPE (prototype) SIZE RANGE LUBRICATION
(m/min)
BISALLOY® Armour Prototex Inox 202135 6 – 15* M1.6 – M36 Cutting Oil
RHA300 / RHA360 steel
BISALLOY® Armour Prototex Inox 202135 6 – 15* M1.6 – M36 Cutting Oil
HTA400 steel
BISALLOY® Armour Prototex Ni 202602 3 M1.6 – M24 Cutting Oil
UHT440 steel
BISALLOY® Armour Paradur H/C 80311 1.6 M3 – M12** Cutting Oil
HHA500 steel
BISALLOY® Armour Paradur H/C 80311 1.2 M3 – M12** Cutting Oil
UHH600 steel
*6m/min using steam tempered taps and 15m/min using tin coated tips.
**For larger size threads, thread milling is recommended.
TAPPING
With the correct tools and cutting speeds, tapping can be
performed in all the BISALLOY ® Armour steel grades of
steel.
02 4272 0444
www.bisalloy.com.au
© Bisalloy Steels Group Limited 2019.
BISALLOY® is a registered trade mark
016 of |Bisalloy
BISALLOY ®
is a
Steels Group registered
Limited, trade mark of BISALLOY® Steels Group Limited, ABN 22 098 674 545
ABN 22 098 674 545