Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASTM A350 LF2 Class 1 Girth Flanges are forged carbon/low-alloy steel fittings designed for low-temperature service down
to -46°C (-50°F). These flanges meet stringent impact toughness requirements (Charpy V-notch testing) for cryogenic
applications in pipelines, LNG plants, and offshore systems. Manufactured in compliance with ASME B16.5 dimensional
standards, they ensure leak-proof connections in high-pressure environments.
The chemical composition of ASTM A350 LF2 CL1 ensures optimal low-temperature performance and weldability:
| Element | Composition (% Max) | Key Function |
|---|---|---|
| Carbon (C) | 0.30% | Strength & Hardness |
| Manganese (Mn) | 0.60-1.35% | Toughness Enhancer |
| Phosphorus (P) | 0.035% | Weldability Control |
| Sulfur (S) | 0.040% | Machinability |
| Silicon (Si) | 0.15-0.30% | Deoxidizer |
| Nickel (Ni) | 0.40% Max | Low-Temp Toughness |
| Property | Requirement | Test Standard |
|---|---|---|
| Tensile Strength | 485-655 MPa (70-95 ksi) | ASTM A370 |
| Yield Strength (Min) | 250 MPa (36 ksi) | ASTM A370 |
| Elongation (Min) | 22% | ASTM A370 |
| Impact Toughness | Avg. ≥ 20 J (15 ft-lbf) | ASTM A370 |
| Standard | Equivalent Grade | Key Differences |
|---|---|---|
| EN 10222 | P355NH (1.0566) | Higher Ni allowance (≤1.0%) |
| NACE MR0175 | Compliant | H₂S service approved |
| JIS G3202 | SFVQ2A | Similar impact values |
ASTM A350 LF2 CL1 flanges are critical in:
