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| Basic
Properties - Mechanical Properties |
| 0.2% Proof
Stress (N/mm2 ) [ksi] minimum |
570 [82.6] |
| Ultimate Tensile Strength
(N/mm2) [ksi] minimum |
830 [120.3] |
| Elongation (%) minimum |
23 |
| Hardness (HBN) |
250-330 |
| Charpy V-notch Impact at ambient Temp (J) [ft.lb] |
70min [51.6min] |
| ASTM A262 Corrosion test Practice B |
Weight loss <0.54g/m2/h |
| Ultrasonic Testing |
According to ASTM E114 |
| Ferrite Content |
35%-55% |
| Microstructure |
Microstructure certified free from grain boundary
carbides, sigma, chi and laves phases |
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|
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Excellent corrosion resistance in a wide variety
of corrosive chemicals including sulphuric, phosphoric and
nitric acids |
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High resistance to pitting and crevice corrosion
in seawater and other chloride containing environments |
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Excellent resistance to stress corrosion cracking
in chloride containing environments |
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High Strength - the minimum 0.2% Proof Stress set at 570N/mm2 |
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|
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High hardness, giving superior bearing properties for running
against other corrosion resistant alloys |
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Excellent ductility and impact strength |
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High resistance to abrasion, erosion and cavitation erosion |
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High structural integrity, optimised phase balance and the
absence of sigma and other deleterious phases. |
| Elements |
C |
Cr |
Cu |
Fe |
Mo |
Mn |
N |
Ni |
P |
S |
Si |
| Minimum |
|
24.0 |
1.50 |
REMAINDER |
2.90 |
|
0.10 |
4.50 |
|
|
|
| Maximum |
0.040 |
27.00 |
2.50 |
|
3.90 |
1.50 |
0.25 |
6.50 |
0.040 |
0.030 |
1.00 |
| Density (Kg.m-1) |
78.1 |
| Magnetic Permeability |
33 |
| Young’s Modulus (N/mm2) |
200 x 103 |
| Specific Heat, 20°C (J.Kg-1.°K-1) |
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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FERRALIUM to MSA-MDS-51VA-BAR |
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STAMICARBON 21022 |
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| Chemical Process Industry Bearing Components: |
| Sulphuric Acid Production, Nitric Acid Processes, Urea Production,
Titanium Dioxide Production, Caustic Evaporators, Equipment
Handling Organic and Fatty Acids |
| 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) |
|
| Drilling – 25.4mm (1”) dia |
150rpm |
0.28 (0.011) |
|
| 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° |
| Alloy Comparisons |
FERRALIUM
255-3AF |
S17400(17-4PH) |
S32205 |
718
(ST)
|
| 0.2% Proof Strength (N/mm2), minimum |
570 |
1070 |
300 |
550
max |
| Corrosion Rate
(mm.y-1) Seawater |
<0.01 |
~1 |
<0.01 |
<0.01 |
Corrosion Rate (mm.y-1)
10% sulphuric acid at 80°C |
<0.15 |
10 |
0.4 |
<0.15 |
Corrosion Rate (mm.y-1)
Boiling 50% nitric acid |
<0.15 |
<0.15 |
<0.15 |
<0.15 |
| Wear Properties related to Hardness (HRC) |
RC30 |
RC38 |
RC20 |
RC20 |
 |
| 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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