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| Basic
Properties - Mechanical Properties |
| 0.2% Proof
Stress (N/mm2 ) [ksi] minimum |
550[79.8] |
| Ultimate Tensile Strength
(N/mm2) [ksi] minimum |
800 [116] |
| Elongation (%) minimum |
25 |
| Hardness (HBN) |
270 max |
| Reduction of Cross Section Area (%) |
45 |
| Charpy V-notch Impact at ambient Temp (J) [ft.lb] |
80min [59min] |
| Charpy V-notch Impact at -46°C (J) [ft.lb] |
45av, 35min [33av, 25.8min] |
| ASTM G48A Corrosion
test at 40°C |
No pitting and weight loss <4.0g/m2 |
| Ultrasonic Testing |
According to ASTM A388 |
| Ferrite Content |
35%-55% |
| Microstructure |
Microstructure certified free from grain boundary
carbides, sigma, chi and laves phases |
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Excellent corrosion resistance in a wide variety of corrosive chemicals |
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Outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C |
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High strength compared to austenitic and 22%Cr duplex stainless steels |
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Excellent ductility and impact strength at both
ambient and sub-zero temperatures |
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High resistance to abrasion, erosion and cavitation
erosion |
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Excellent resistance to stress corrosion cracking
in chloride containing environments |
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Listed in NACE MR 01 75 for sour service |
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ASME Approval for Pressure Vessel application |
| Elements |
C |
Cr |
Cu |
Fe |
Mo |
Mn |
N |
Ni |
P |
S |
Si |
W |
| Minimum |
|
24.0 |
|
REMAINDER |
3.00 |
|
0.24 |
6.00 |
|
|
0.20 |
0.50 |
| Maximum |
0.030 |
26 |
0.50 |
|
5.00 |
1.20 |
0.32 |
8.00 |
0.035 |
0.020 |
0.80 |
1.00 |
| Density (Kg.m-1) |
7810 |
| Magnetic Permeability |
33 |
| Young’s Modulus (N/mm2) |
199 x 103 |
| Specific Heat, 20°C (J.Kg-1.°K-1) |
475 |
| Fracture Toughness, Kq (MPa.m) |
475 |
| Specific Electrical Resistance, 20°C (µΩ.m) |
0.80 |
| Thermal conductivity, 20°C (W.m-1.°K-1) |
14.2 |
| Mean coefficient of thermal expansion,
20-100°C (°K-1) |
11.1 x 10-6 |
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| The major utilisation of FERRALIUM 255-FG46 is for fasteners
and actuators in the following industrial applications: |
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| Chemical Process Industry: |
Nitric Acid Processes, Polypropylene Production, PVC Production, Dioxide, Caustic Evaporators, Equipment Handling Organic and Fatty Acids |
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| Marine Industry and Shipbuilding: |
Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers |
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| Oil and Gas Industry: |
Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment |
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|
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| Pollution Control: |
| Fans and pumps, Wet Scrubbers, Incinerators |
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| Pulp and Paper Industry: |
Black liquor heater tubes, Digester Blow Valves, Rotary Feed Valves, I.D.Fans, Brownstock Washers, Precipitators, Bleaching Components |
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| Food Industry: |
Sugar Cane Centrifuges, Corn and Vegetable processing plant |
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| Agrochemicals: |
| Fertiliser Production (Wet phosphoric acid) |
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| Civil Engineering: |
| Sewage Treatment |
| Machining
Advice |
Back
to Top |
| It should be noted
that machining of FERRALIUM 255-FG46 can result in
the reduction of mechanical properties
due to stress relief of the work-hardened microstructure. |
|
| Operation |
Cutting Speed m/min
(ft/min) |
Feed Rate
mm/rev
(in/rev) |
Depth of cut mm
(in) |
| Milling |
40 (130) |
0.05-0.13 mm/tooth
0.02-0.005 in/tooth |
0.5-6.0
(0.02-0.25) |
| Drilling – 6.4mm (1/4”) dia |
250rpm |
0.075 (0.003) |
|
| Drilling – 12.7mm (1/2”) dia |
250rpm |
0.125 (0.005) |
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| Drilling – 25.4mm (1”) dia |
150rpm |
0.28 (0.011) |
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| Turning - Roughing |
30-45 (100-150) |
0.20 – 0.38 (0.008-0.015) |
3 (0.125) |
| Turning - Finishing |
50-60 (165-200) |
0.13 – 0.20 (0.005-0.008) |
0.5 (0.02) |
| Tooling |
Milling/Turning: Carbide
(SANDVIK GC 235, SECO T25M)
Drilling: HSS, point angle 118°,
chisel angle 120° |
KEY Features of the Alloy |
High strength compared to austenitic and 22% chrome duplex stainless steels
Excellent corrosion resistance in a wide variety of corrosive chemicals including seawater and industrial acids
Excellent ductility and impact strength at both ambient and sub-zero temperatures
High resistance to abrasion, erosion and cavitation erosion
Excellent resistance to stress corrosion cracking
Applicable for sour service operation
Specified for pressure vessel applications |
| Alloy Comparisons |
S31803 |
S17400
(17-4PH) |
718
( ST )
|
S31254 |
Alloy 2507 |
| 0.2% Proof Strength (N/mm2), minimum |
450 |
1070 |
550 |
300 |
550 |
| Corrosion Rate
(mm.y-1) Seawater |
<0.01 |
~1 |
<0.01 |
<0.01 |
<0.01 |
Corrosion Rate (mm.y-1)
10% sulphuric acid at 80°C |
<0.4 |
10 |
>1 |
1.5 |
<0.15 |
Corrosion Rate (mm.y-1)
Boiling 50% nitric acid |
<0.15 |
<0.15 |
<0.15 |
0.4 |
<0.15 |
| Wear Properties related to Hardness (HBN) |
RC25 |
RC38 |
RC20 |
RC20 |
RC28 |
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| Back
to Top |
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Disclaimer
Data in this publication is provided solely for the purposes of distribution
of information. Langley Alloys cannot make guarantees with respect to subject
matter or accuracy of this information. Langley Alloys specifically disclaims
all guarantees, expressed, implied or otherwise, including without limitation,
all warranties of merchantability and fitness for a particular purpose. This
publication may include technical inaccuracies or typographical errors. If
errors are found, please make a notification via e-mail to: info@langleyalloys.com |
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