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Help CenterAmerican Standard Astm A350 Lf5 Alloy Round Steel, Low-temperature Resistant A350 Lf6 Round Bar Forgings, Cut and Sold Retail From 55 to 200
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Industry Pain Points and Solutions
Under low-temperature working conditions (such as -45℃ to -60℃), ordinary carbon steel and alloy steel are prone to brittle fracture, seriously threatening the safe operation of key equipment in petrochemical, marine engineering, liquefied natural gas (LNG) storage and transportation, nuclear engineering and aerospace. The impact absorption energy of traditional steel drops sharply in low-temperature environments, resulting in a very high risk of structural failure. In response to this industry pain point, Liaocheng Jincheng Yangming Special Steel Co., Ltd. relies on years of special steel production experience and strictly follows the American Standard ASTM A350 to launch the LF5 and LF6 series of low-temperature alloy round steel and forgings. Through optimizing the alloy ratio (such as controlling the carbon content and adding nickel and chromium elements) and precise forging and heat treatment processes, this product significantly improves the impact toughness of the material at -60°F (-51℃), solves the problem of low-temperature brittleness, and provides users with a safe and reliable low-temperature-resistant steel solution.
Product Working Mechanism and Core Features
- Material Design: ASTM A350 LF5/LF6 are carbon steel and alloy steel for low-temperature pressure-bearing parts. Among them, LF5 is the carbon steel grade, and LF6 is the alloy steel grade (containing Ni, Cr, etc.). By strictly controlling the content of impurities such as phosphorus and sulfur and adding appropriate alloying elements, the material is ensured to maintain excellent ductility and impact absorption energy at low temperatures.
- Forging Process: Hot forging is used for forming, followed by normalizing or tempering treatment after forging to refine the grain structure and eliminate internal stress, enabling the material to obtain uniform mechanical properties. In particular, the low-temperature impact performance meets the requirements of ASTM A350 (such as the impact energy of LF6 at -60°F ≥ 20J).
- Flexible Specifications: Round steel and bars with diameters ranging from 55mm to 200mm are provided, and retail cutting according to customer requirements is supported to reduce waste and lower inventory costs. Forging blanks or finished parts can also be provided.
- Wide Applications: It is suitable for petrochemical equipment (such as low-temperature reactors and pipe fittings), low-temperature valves for ships, structural parts for nuclear engineering and aerospace, hydraulic cylinders and other scenarios with strict requirements for low-temperature toughness.
- Quality Control: Each batch of products comes with a material certificate, and the chemical composition and mechanical properties are traceable to ensure compliance with ASTM A350.
| Parameter items | Typical values (refer to ASTM A350 standard) |
| Execution standard | ASTM A350 |
| Grade | LF5 / LF6 |
| Specification range | Diameter 55-200mm (other sizes can be customized) |
| Carbon content (C) | ≤0.30% |
| Manganese content (Mn) | 0.60-1.35% |
| Silicon content (Si) | 0.15-0.30% |
| Nickel content (Ni, LF6) | 0.40-1.00% |
| Impact test temperature | -60°F (-51℃) |
| Minimum impact absorption energy (LF6) | ≥20J (longitudinal) |
| Supply form | Round steel, round bar, forging, cutting and retail |
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