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| Basic
Properties - Mechanical Properties |
| 0.2% Proof
Stress (N/mm2 )[ksi] minimum |
415 [60.2] |
| Ultimate Tensile Strength
(N/mm2) [ksi] minimum |
725 [105.1] |
| Elongation (%) minimum |
35 |
| Hardness (HBN) |
270max |
| Additional Testing |
|
| Magnetic Permeability |
<1.05 |
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|
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High strength compared to 316L and 317L austenitic stainless steels |
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Excellent ductility and impact strength at both ambient and sub-zero temperatures |
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Listed in MR-01-75 for sour service oilfield applications |
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Non-magnetic |
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Higher resistance to abrasion, erosion and cavitation erosion than 316 and 317 stainless |
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| Elements |
C |
Cr |
Fe |
Mo |
Mn |
N |
Ni |
Nb |
P |
S |
Si |
V |
| Minimum |
|
20.5 |
REMAINDER |
1.5 |
4.0 |
0.2 |
11.5 |
0.1 |
|
|
|
0.1 |
| Maximum |
0.06 |
23.5 |
6.00 |
3.0 |
6.0 |
0.4 |
13.5 |
0.3 |
0.45 |
0.3 |
1.0 |
0.3 |
| Density (Kg.m-3) |
7880 |
| Magnetic Permeability |
<1.01 |
| Young’s Modulus (N/mm2) |
197x 103 |
| Specific Heat 20°C (J.Kg-1.°K-1) |
475 |
| Electrical resistance, 20°C (µ.Ω.m) |
0.82 |
| Thermal conductivity, 20°C (W.m-1.°K-1) |
13.3 |
| Mean coefficient of thermal expansion, 20-100°C (°K-1) |
17.9 x 10-6 |
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Chemical Process Industry:
Sulphuric Acid Production, Nitric Acid Processes, Polythionic acid resistant, Urea Production, Equipment Handling Organic and Fatty Acids
Marine Industry and Shipbuilding:
Pumps, Valves, Masts, Tie downs
Oil and Gas Industry:
Downhole equipment
Food Industry:
Listed in food handling standards as an acceptable material for food contact surfaces
Pulp and Paper Industry:
Valves and fittings
|
| 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 |
250 rpm |
0.125(0.005) |
|
| Drilling 25.4mm(1") dia |
150 rpm |
0.28(0.011) |
|
| Turning - Roughing |
27 - 42 ( 90 - 140 ) |
0.2-0.38 (0.008-0.015) |
3 (0.125) |
| Turning - Finishing |
35 - 60 ( 120 - 190 ) |
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 |
Higher strength than 316-type austenitic stainless steels
Good 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
Applicable for sour service operation
Low magnetic permeability |
| Alloy Comparisons |
S20910 |
S32205 |
718 (Aged) |
S31254 |
FERRALIUM 255-SD50 |
| (0.2% Proof Strength, N/mm2) |
420 |
510 |
827 |
325 |
610 |
Corrosion Rate (mm.y-1)Seawater |
<0.01 |
<0.01 |
<0.18 |
<0.01 |
<0.01 |
Corrosion Rate (mm.y-1)10% sulphuric acid at 80°C |
0.7 |
0.4 |
0.15 |
1.5 |
<0.15 |
Corrosion Rate (mm.y-1) Boiling 50% nitric acid |
0.18 |
<0.15 |
0.15 |
<0.4 |
<0.15 |
| Wear Properties related to Hardness (HRC) |
RC27 |
RC25 |
RC38 |
RC20 |
RC27 |
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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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