ASTM A350 LF2 CL1 Girth Flanges NPS 1/2" to 24" Class 150 to 2500#
Brand Name:YUHONG
Certification:API, PED
Model Number:ASTM A350 LF2 CL1
Minimum Order Quantity:1pcs
Delivery Time:According to quantity
Payment Terms:L/C,T/T
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Ningbo Zhejiang China
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20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
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1. Introduction to ASTM A350 LF2 Class 1 Girth Flanges
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.
2. Chemical Composition Requirements
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 |
3. Mechanical Properties of LF2 CL1 Flanges
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 |
4. Equivalent Grades & International Standards
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 |
5. Key Applications in Industry
ASTM A350 LF2 CL1 flanges are critical in:
- Cryogenic Systems: LNG terminals, liquid nitrogen pipelines
- Oil & Gas: Subsea pipelines, Arctic drilling rigs
- Power Plants: Cooling systems, hydrogen handling
- Chemical Processing: Ethylene, ammonia, and propane transport
6. Manufacturing & Quality Assurance
- Process: Die-forged & heat-treated (normalized or quenched + tempered)
- Testing: 100% UT + hydrostatic testing per ASME B16.34
- Certification: Mill Test Reports (MTRs) with traceable heat numbers
- Dimensions: ASME B16.5 Class 150 to 2500, NPS 1/2" to 24"
ASTM A350 LF2 CL1 Girth Flanges NPS 1/2" to 24" Class 150 to 2500#
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