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Solitaire Overseas is a leading manufacturer, stockist, and exporter of high grade Carbon Steel Low Temperature Flanges designed for sub zero operational environments and demanding industrial applications. Manufactured in strict compliance with international manufacturing standards such as ASME B16.5, ASME B16.47 Series A and B, BS 4504, EN 1092 1, and DIN norms, our Low Temperature Carbon Steel (LTCS) flanges offer superior notch toughness, excellent weldability, and exceptional resistance to brittle fracture at temperatures dropping down to minus 101 degrees Celsius. Whether your project requires standard dimensions or custom forged components built to client blueprints, Solitaire Overseas provides fast worldwide dispatch, full material traceability, and competitive wholesale pricing. Along with low-temperature carbon steel products, we also supply high-performance alloy steel flanges for elevated-temperature and high-strength pressure systems.
Request a QuoteLow Temperature Carbon Steel (LTCS) flanges are specialized pipe components forged specifically to prevent brittle failure in sub zero operating conditions. Standard carbon steel materials like ASTM A105 undergo a ductile to brittle transition as temperatures drop, making them susceptible to sudden cracking under stress. To counteract this limitation, low temperature carbon steel alloys are formulated with controlled chemical additions like nickel and manganese, combined with specialized heat treatments such as normalizing or quenching and tempering.
The addition of nickel lowers the ductile to brittle transition temperature, maintaining fine grain structure and matrix ductility. As a result, LTCS flanges retain structural integrity, impact strength, and fracture toughness in sub ambient applications. These flanges are indispensable components in industries dealing with liquefied natural gas (LNG), industrial cryogenic gases, oil and gas extraction in arctic regions, liquid nitrogen lines, and low temperature chemical processing systems.
| Material Grade | Nominal Nickel Content | Minimum Impact Test Temperature | Primary Application |
|---|---|---|---|
ASTM A350 LF1 |
Plain Carbon |
minus 29 degrees C (minus 20 degrees F) |
Standard cold weather piping systems |
ASTM A350 LF2 Class 1 |
Trace / Carbon Manganese |
minus 46 degrees C (minus 50 degrees F) |
General low temp gas & oil processing |
ASTM A350 LF2 Class 2 |
Trace / High Strength |
minus 46 degrees C (minus 50 degrees F) |
High pressure cold process lines |
ASTM A350 LF3 |
3.20 to 3.80 percent |
minus 101 degrees C (minus 150 degrees F) |
Cryogenic gas storage and LNG transport |
ASTM A350 LF6 Class 1/2 |
Low Alloy / High Yield |
minus 51 degrees C (minus 60 degrees F) |
High yield structural piping components |
| Parameter / Feature | Technical Details & Standard Specifications |
|---|---|
Material Specifications |
ASTM A350 / ASME SA350, ASTM A420, ASTM A694 |
Standard Material Grades |
ASTM A350 LF2 (Class 1 & Class 2), ASTM A350 LF1, ASTM A350 LF3, ASTM A350 LF6 (Class 1, 2, 3) |
Dimensional Standards |
ASME B16.5, ASME B16.47 (Series A & Series B), MSS SP-44, BS 4504, EN 1092-1, DIN Standards |
Nominal Pipe Size (NPS) |
ASME B16.5: 1/2" to 24" (DN15 – DN600) ASME B16.47: 26" to 60" (DN650 – DN1500) |
Pressure Class Ratings |
Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500 |
DIN / EN Pressure Ratings |
PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250, PN320, PN400 |
Flange Types Available |
Weld Neck (WNRF), Slip-On (SORF), Blind (BLRF), Socket Weld (SWRF), Threaded (THRF), Lap Joint (LJRF), Spectacle Blind, Ring Type Joint (RTJ) |
Flange Face Finishes |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female (M&F), Tongue & Groove (T&G) |
Service Temperature Range |
ASTM A350 LF1: Down to -29°C (-20°F) ASTM A350 LF2: Down to -46°C (-50°F) ASTM A350 LF3: Down to -101°C (-150°F) |
Heat Treatment Options |
Normalized, Normalized and Tempered, or Quenched and Tempered |
Mandatory Testing Protocols |
Sub-Zero Charpy V-Notch Impact Testing, Hydrostatic Testing, Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI), Positive Material Identification (PMI) |
Special Quality Norms |
NACE MR0175 / ISO 15156 (Sour Service Compliance), NACE MR0103 |
Material Test Certification |
EN 10204 Type 3.1 Mill Test Certificate (3.2 Available on Request with Third-Party Inspection) |
Primary Industry Applications |
LNG Terminals, Cryogenic Processing, Arctic Oil & Gas Pipelines, Petrochemical Refining, Industrial Gas Systems |
| Element | ASTM A350 LF2 (Percent) | ASTM A350 LF3 (Percent) |
|---|---|---|
Carbon (C) |
0.30 max |
0.20 max |
Manganese (Mn) |
0.60 to 1.35 |
0.90 max |
Phosphorus (P) |
0.035 max |
0.035 max |
Sulfur (S) |
0.040 max |
0.040 max |
Silicon (Si) |
0.15 to 0.30 |
0.15 to 0.30 |
Nickel (Ni) |
0.40 max |
3.20 to 3.80 |
Chromium (Cr) |
0.30 max |
0.30 max |
Molybdenum (Mo) |
0.12 max |
0.12 max |
Copper (Cu) |
0.40 max |
0.40 max |
Columbium (Cb) |
0.02 max |
0.02 max |
Vanadium (V) |
0.08 max |
0.03 max |
| Property Parameter | ASTM A350 LF2 Class 1 | ASTM A350 LF2 Class 2 | ASTM A350 LF3 |
|---|---|---|---|
Tensile Strength (MPa / ksi) |
485 to 655 / 70 to 95 |
485 to 655 / 70 to 95 |
485 to 655 / 70 to 95 |
Minimum Yield Strength (MPa / ksi) |
250 / 36 |
290 / 42 |
250 / 36 |
Elongation in 2 inches (Min Percent) |
22 percent |
22 percent |
22 percent |
Reduction of Area (Min Percent) |
30 percent |
30 percent |
35 percent |
Hardness (HBW Max) |
197 HBW |
197 HBW |
197 HBW |
Charpy V Notch Impact Energy (Avg) |
20 Joules (15 ft lbs) |
20 Joules (15 ft lbs) |
20 Joules (15 ft lbs) |
Charpy Test Temperature |
minus 46 degrees C |
minus 46 degrees C |
minus 101 degrees C |
| Pressure Class | Working Pressure at minus 29 to 38 degrees C | Working Pressure at minus 46 degrees C |
|---|---|---|
Class 150 |
19.6 bar (285 psi) |
19.6 bar (285 psi) |
Class 300 |
51.1 bar (740 psi) |
51.1 bar (740 psi) |
Class 600 |
102.1 bar (1480 psi) |
102.1 bar (1480 psi) |
Class 900 |
153.2 bar (2220 psi) |
153.2 bar (2220 psi) |
Class 1500 |
255.3 bar (3705 psi) |
255.3 bar (3705 psi) |
Class 2500 |
425.5 bar (6170 psi) |
425.5 bar (6170 psi) |
| NPS (Inches) | Outer Diameter (OD) | Thickness (C) | Hub Diameter (H) | Length Thru Hub (L) | Bolt Circle Dia (BC) | Number of Bolts | Bolt Hole Dia |
|---|---|---|---|---|---|---|---|
1/2 inch |
89 mm |
11.2 mm |
30.2 mm |
47.6 mm |
60.3 mm |
4 |
15.9 mm |
3/4 inch |
98 mm |
12.7 mm |
38.1 mm |
52.4 mm |
69.8 mm |
4 |
15.9 mm |
1 inch |
108 mm |
14.3 mm |
49.2 mm |
55.6 mm |
79.4 mm |
4 |
15.9 mm |
1.5 inch |
127 mm |
17.5 mm |
65.0 mm |
61.9 mm |
98.4 mm |
4 |
15.9 mm |
2 inch |
152 mm |
19.1 mm |
77.7 mm |
63.5 mm |
120.7 mm |
4 |
19.1 mm |
3 inch |
191 mm |
23.9 mm |
108.0 mm |
69.9 mm |
152.4 mm |
4 |
19.1 mm |
4 inch |
229 mm |
23.9 mm |
134.9 mm |
76.2 mm |
190.5 mm |
8 |
19.1 mm |
6 inch |
279 mm |
25.4 mm |
192.1 mm |
88.9 mm |
241.3 mm |
8 |
22.2 mm |
8 inch |
343 mm |
28.6 mm |
246.1 mm |
101.6 mm |
298.5 mm |
8 |
22.2 mm |
10 inch |
406 mm |
30.2 mm |
304.8 mm |
101.6 mm |
362.0 mm |
12 |
25.4 mm |
12 inch |
483 mm |
31.8 mm |
365.1 mm |
114.3 mm |
431.8 mm |
12 |
25.4 mm |
LNG storage tanks, regasification plants, and marine loading arms operate at sub zero conditions. ASTM A350 LF2 and LF3 flanges ensure leak tight connection integrity across high pressure lines carrying liquefied methane and ethane.
Cross country pipelines and offshore installations located in northern latitudes experience surface temperatures far below freezing. LTCS flanges prevent low temperature brittle fracture in wellhead manifolds and compression stations.
Refrigeration systems, ethylene plants, and air separation units rely on low temperature pipe flanges to connect heat exchangers and distillation columns. To form complete low temperature piping systems, these flanges are routinely welded to matching seamless pipe networks such as ASTM A334 Low Temp Carbon Steel Tubes and heavy wall Carbon Steel Tubes.
Facilities managing bulk liquid nitrogen, argon, carbon dioxide, and oxygen require pressure piping that resists thermal shock and mechanical embrittlement over long operational cycles.
ASTM A105 is the standard forging specification for ambient to high temperature carbon steel piping components, with no mandatory low temperature impact testing requirements. In contrast, ASTM A350 LF2 is specifically engineered for low temperature service down to minus 46 degrees Celsius, requiring mandatory heat treatment (normalizing or quenching) and Charpy V notch impact testing.
ASTM A350 LF2 Class 1 flanges operate safely from minus 46 degrees Celsius up to elevated service temperatures around 345 degrees Celsius. However, their primary structural advantage lies in their sub zero toughness between minus 10 degrees Celsius and minus 46 degrees Celsius.
Yes. Solitaire Overseas provides full EN 10204 3.1 certified Mill Test Reports with all low temperature carbon steel shipments. The certificate details chemical ladle analysis, tensile and yield test values, Brinell hardness readings, heat treatment logs, and sub zero Charpy V notch impact results.
Flanges undergo normalizing, or normalizing plus tempering, or quenching plus tempering. This allows for better grain structure of the metal, relieving stress in the forged product. Additionally, this ensures that the material can pass Charpy tests at a temperature of minus 46 degrees Celsius.
Yes, it can be done provided that a matching filler metal like E7018-1 is used. However, it is better to combine flanges with low-temperature pipe grades like ASTM A333 Grade 6 to secure the weld against embrittlement.
Both classes handle temperatures down to negative 46 degrees Celsius and have similar impact resistance. Still, Class 2 is subjected to a special heat treatment, which gives it a minimum yield strength of 290 MPa, compared to Class 1 with only 250 MPa as a minimum.
Yes, provided that flanges satisfy all strict standards of NACE. The hardness of the material should not exceed 197 HBW (22 HRC) and the proper heat treatment is applied to prevent sulfide stress cracking in H2S environments.
Contact Solitaire Overseas, or see our Carbon Steel Flanges and Carbon Steel Forged Flanges ranges.