ASTM A350 LF2 Round Bars
ASTM A350 LF2 Round Bar, A350 LF2 Carbon Steel Round Bar Supplier & Manufacturer
ASTM A350 LF2 Round Bar is a widely used low temperature carbon steel product designed to deliver excellent toughness, strength, and performance in sub-zero conditions. Known for its durability and resistance to brittle fracture, the A350 LF2 round bar is highly suitable for critical industrial applications such as pressure vessels, flanges, and pipelines in the oil and gas sector. These bars are manufactured under strict ASTM and ASME standards, ensuring reliability and consistent mechanical properties across various environments.
At Stellar Alloys Steel Pipes and Tubes, we supply premium quality ASTM A350 LF2 Round Bar, ASME SA350 LF2 Round Bar, and A350 LF2 carbon steel round bar in multiple sizes, finishes, and specifications. Our products are available in different forms such as ASTM A350 LF2 rod, A350 LF2 forged bar, and ASTM A350 LF2 bright bar, catering to diverse industrial requirements. We focus on delivering high-performance materials that meet international standards while maintaining competitive pricing.
The LF2 round bar is specifically engineered for low-temperature service, making it ideal for industries requiring high impact resistance and structural integrity under extreme conditions. We supply ASTM A350 LF2 round bars with full mill test certificates (MTCs), third-party inspection reports, and customs documentation for export to 40+ countries. Our in-house quality control covers ultrasonic testing, Charpy impact testing at −46°C, and PMI — ensuring every bar meets ASTM A350 specification before dispatch.
Table of Contents
- Specification of ASTM A350 LF2 Round Bar
- Types of ASTM A350 LF2 Round Bar
- Chemical Composition of ASTM A350 LF2 Round Bar
- Mechanical Properties of ASTM A350 LF2 Round Bar
- Equivalent Grades of ASTM A350 LF2 Round Bar
- Round Bar Sizes of ASTM A350 LF2 Round Bar
- Round Bar Price List of ASTM A350 LF2 Round Bar
- Weight Chart of ASTM A350 LF2 Round Bar
- Applications & Uses of ASTM A350 LF2 Round Bar
- Qualities of ASTM A350 LF2 Round Bar
- Manufacturing & Heat Treatment of ASTM A350 LF2 Round Bar
- Dimensional Tolerances of ASTM A350 LF2 Round Bar (as per ASTM A484)
- Related Products
- FAQs About ASTM A350 LF2 Round Bars
Specification of ASTM A350 LF2 Round Bar
Specification | Details |
Standard | ASTM A350 / ASME SA350 |
Grade | LF2 |
Material Type | Low Temperature Carbon Steel (LTCS) |
Form | Round Bar, Square Bar, Hex Bar |
Size Range | 10 mm to 500 mm Diameter |
Length | 3m, 6m, Custom Cut Length |
Finish | Black, Bright, Polished |
Condition | Normalized / Quenched & Tempered |
Testing | UT, Impact Test at −46°C, PMI, Mechanical Testing, Hardness (HB/HRC) |
Types of ASTM A350 LF2 Round Bar
ASTM A350 LF2 Forged Round Bar
ASTM A350 LF2 Bright Bar
ASTM A350 LF2 Black Bar
ASTM A350 LF2 Square Bar
ASTM A350 LF2 Bright Bar
ASTM A350 LF2 Hex Bar_
- ASTM A350 LF2 Forged Round Bar — Produced by hot forging; offers higher density and superior mechanical integrity for heavy-duty flanges and pressure parts.
- ASTM A350 LF2 Bright Bar — Cold-drawn and ground for tight dimensional tolerances; ideal for CNC machining of valves, fittings, and connectors.
- ASTM A350 LF2 Black Bar — Hot-rolled finish; cost-effective option for structural and general engineering applications with standard tolerances.
- ASTM A350 LF2 Polished Bar — Surface-finished to Ra 0.8–1.6 μm; used where smooth finish, visual inspection, or improved surface corrosion resistance is required.
- ASTM A350 LF2 Square Bar — Available in 10–200 mm sizes; suitable for machining key components, shafts, and block fabrication.
- ASTM A350 LF2 Hex Bar — Hexagonal cross-section; widely used for direct bolt and fastener manufacturing without additional machining.
These variations of ASTM A350 LF2 round bar, also known as LF2 round bar or A350 LF2 round bar, help meet diverse industrial and machining requirements.
Chemical Composition of ASTM A350 LF2 Round Bar
Element | Composition (%) |
Carbon (C) | 0.30 max |
Manganese (Mn) | 0.60 – 1.35 |
Phosphorus (P) | 0.035 max |
Sulfur (S) | 0.040 max |
Silicon (Si) | 0.15 – 0.30 |
Nickel (Ni) | 0.40 max |
Copper (Cu) | 0.40 max |
Chromium (Cr) | 0.30 max |
Molybdenum (Mo) | 0.12 max |
Mechanical Properties of ASTM A350 LF2 Round Bar
Property | Value |
Tensile Strength | 485 – 655 MPa |
Yield Strength | ≥ 250 MPa |
Elongation | ≥ 22% |
Impact Test | Min. 27 J at −46°C (Charpy V-Notch as per ASTM A370) |
Equivalent Grades of ASTM A350 LF2 Round Bar
Standard | Equivalent Grade |
ASTM | A105 (with limitations) |
EN | P250GH |
DIN | 1.0460 |
ISO | ISO 9328-2 P250GH |
Round Bar Sizes of ASTM A350 LF2 Round Bar
- Diameter: 10 mm to 500 mm
- Length: Up to 6 meters or custom cut sizes
- Available in forged and rolled conditions
- Machining and cutting as per drawings
Our stainless steel round bars serve mission-critical applications across multiple industries due to their exceptional strength, corrosion resistance, and reliability in harsh environments:
Common applications include:
- Oil and Gas Industry – Downhole pump shafts, valve stems, instrumentation components, and wellhead equipment
- Chemical Processing Plants – Reactor vessel shafts, agitator components, pump impellers, and corrosion-resistant fasteners
- Marine and Offshore Structures – Propeller shafts, deck equipment, rigging hardware, and saltwater-resistant fittings
- Automotive and Mechanical Engineering – Engine components, transmission shafts, precision machined parts, and suspension elements
- Pump and Valve Manufacturing – Valve stems, pump shafts, piston rods, and high-pressure fittings
- Construction and Structural Frameworks – Architectural supports, railing systems, and load-bearing structural members
- Food Processing Equipment – Mixer shafts, conveyor components, sanitary fittings, and hygienic processing machinery
- Aerospace Components – Landing gear parts, high-strength fasteners, precision machined aircraft components
Round Bar Price List of ASTM A350 LF2 Round Bar
Size (mm)
Price (INR/kg)
Type
20 – 50 mm
₹85 – ₹110
Bright Bar
50 – 100 mm
₹80 – ₹105
Black Bar
100 – 300 mm
₹75 – ₹100
Forged Bar
Note: Prices are indicative and may vary based on quantity, finish, and market conditions.
Weight Chart of ASTM A350 LF2 Round Bar
Diameter (mm)
Weight (kg/m)
20 mm
2.47
25 mm
3.85
32 mm
6.31
40 mm
9.86
50 mm
15.41
65 mm
26.04
80 mm
39.46
100 mm
61.65
150 mm
138.71
200 mm
246.61
Note: Weights are calculated based on a material density of 7.85 g/cm³.
Applications & Uses of ASTM A350 LF2 Round Bar
- Oil & Gas Industry: Used for flanges, connectors, and offshore components due to excellent low-temperature toughness.
- Petrochemical Plants: Ideal for chemical processing equipment handling low-temperature fluids and gases.
- Pressure Vessels: Applied in manufacturing vessel parts requiring high strength and crack resistance.
- Heat Exchangers: Used in structural and connecting components for efficient thermal operations.
- Valves and Flanges Manufacturing: Commonly used for precision-machined valves and flanges with high durability.
- Pipeline Systems: Suitable for pipelines carrying oil, gas, and cryogenic fluids in cold environments.
- Power Generation Plants: Used in piping, turbines, and structural parts requiring thermal and mechanical stability.
Qualities of ASTM A350 LF2 Round Bar
All our manufactured ranges of ASTM A350 LF2 round bar, also known as LF2 round bar or A350 LF2 round bar, offer excellent performance characteristics that make them suitable for demanding industrial applications. These high-quality A350 LF2 carbon steel round bar products are widely used due to the following properties:
- High tensile strength and durability
- Excellent low-temperature toughness
- Withstands heavy loads and pressure conditions
- Strong and stable mechanical properties
- Suitable for surface coating (paint, epoxy, galvanising) to extend service life in aggressive environments
- Impact tested per ASTM A370 at −46°C, certified by third-party inspection agencies such as BV, SGS, and TUV
These qualities make ASTM A350 LF2 round bar a preferred choice for critical applications in industries such as oil & gas, petrochemical, and power generation.
Manufacturing & Heat Treatment of ASTM A350 LF2 Round Bar
ASTM A350 LF2 round bars are supplied in either normalised or quenched-and-tempered (Q&T) condition depending on size and application requirements. Normalising is carried out at 870–925°C followed by air cooling, which refines the grain structure and improves low-temperature toughness. For applications requiring higher strength and tighter mechanical properties, Q&T treatment is used. In this process, the bars are austenitised at 870–925°C, then quenched in water or oil, and tempered above 620°C. All ASTM A350 LF2 round bar products are impact-tested after heat treatment to ensure compliance with ASTM A350 Charpy V-notch requirements.
Dimensional Tolerances of ASTM A350 LF2 Round Bar (as per ASTM A484)
- Diameter 10–100 mm → ±0.40 mm
- Diameter 100–200 mm → ±0.80 mm
- Out-of-roundness → 50% of diameter tolerance
- Straightness → 3 mm per 1000 mm length
Related Products
- ASTM A105 Carbon Steel Round Bar
- ASTM A182 F11 / F22 Alloy Steel Bars
- EN8 Round Bars
- Stainless Steel Round Bars
- Alloy Steel Forged Bars
FAQs About ASTM A350 LF2 Round Bars
ASTM A350 LF2 is a low-temperature carbon steel grade designed for applications requiring high toughness and strength at sub-zero temperatures.
No, A350 LF2 round bar is not stainless steel. It is a low-temperature carbon steel material.
ASTM A350 LF2 is suitable for low-temperature applications, while A105 is used for ambient temperature services and lacks low-temperature impact properties.
Yes, ASTM A350 LF2 round bar is a low-temperature carbon steel (LTCS) grade with enhanced toughness.