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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 |
750 [108.8]] |
| Elongation (%) minimum |
25 |
| Hardness (HBN) |
270max |
| Reduction of Cross Section Area (%) minimum |
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 50°C |
No pitting and weight loss <0.8g/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 |
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|
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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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|
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Excellent ductility and impact strength at both ambient and sub-zero temperatures |
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|
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High resistance to abrasion, erosion and cavitation erosion |
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|
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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 |
0.5 |
REMAINDER |
3.0 |
|
0.20 |
6.00 |
|
|
|
0.50 |
| Maximum |
0.030 |
26.00 |
1.0 |
|
4.0 |
1.0 |
0.30 |
8.00 |
0.030 |
0.010 |
1.00 |
1.00 |
| Density (Kg.m-3) |
7810 |
| Magnetic Permeability |
33 |
| Young’s Modulus (N/mm2) |
199 x 103 |
| Fracture Toughness, KQ (MPa.m½) |
98 |
| 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 |
Chemical Process Industry:
Nitric Acid Processes, Polypropylene Production, PVC Production, Dioxide, Caustic Evaporators, Equipment Handling Organic and Fatty Acids
Marine Industry and Shipbuilding:
Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers
Oil and Gas Industry:
Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment
Pollution Control:
Fans and pumps, Wet Scrubbers, Incinerators
Pulp and Paper Industry:
Black liquor heater tubes, Digester Blow Valves, Rotary Feed Valves, I.D.Fans, Brownstock Washers, Precipitators, Bleaching Components
Food Industry:
Sugar Cane Centrifuges, Corn and Vegetable processing plant
Agrochemicals:
Fertiliser Production (Wet phosphoric acid)
Civil Engineering:
Sewage Treatment |
|
| 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 |
| 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 |
S31803 |
S17400(17-4PH) |
S31254 |
718
(ST)
|
Alloy 32760 |
| 0.2% Proof Strength (N/mm2), minimum |
450 |
1070 |
300 |
550
max |
550 |
| Corrosion Rate
(mm.y-1) Seawater |
~1 |
~1 |
<0.01 |
<0.01 |
<0.01 |
Corrosion Rate (mm.y-1)
10% sulphuric acid at 80°C |
10 |
10 |
0.4 |
<0.15 |
<0.15 |
Corrosion Rate (mm.y-1)
Boiling 50% nitric acid |
<0.15 |
<0.15 |
<0.15 |
<0.15 |
<0.15 |
| Wear Properties related to Hardness (HRC) |
RC38 |
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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