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Help Center15crni3mov Alloy Steel Bar With Low-temperature Toughness, 15crni3mova Round Steel Resistant to Seawater Corrosion, Diameter 16 - 300
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Core pain points and solutions in the industry
In the fields of offshore engineering, low-temperature storage and transportation equipment, and chemical equipment, materials are simultaneously faced with the dual threats of low-temperature brittle fracture and seawater electrochemical corrosion. Traditional alloy steels often fail to address both issues: improving low-temperature toughness sacrifices corrosion resistance, while enhancing corrosion resistance leads to a decrease in strength. This results in a sharp increase in equipment maintenance costs, a shortened service cycle, and even safety accidents. Liaocheng Jincheng Yangming Special Steel Co., Ltd., with years of research and development and practice in special steel, has launched the 15CrNi3MoV(A) alloy steel bar to address this difficulty. Through precise control of the micro-alloying ratios of Cr, Ni, Mo, and V and ultra-pure smelting processes, this steel grade is endowed with excellent seawater corrosion resistance while ensuring good low-temperature toughness. The company is located in Liaocheng, Shandong, and mainly deals in special steels such as precipitation hardening, duplex, heat-resistant, and corrosion-resistant steels. Its products are widely used in industries such as shipbuilding, petrochemical, and nuclear engineering. We, with a practical attitude, provide customers with round steel with a diameter of 16 - 300mm that has undergone strict inspection, solving the problems of low-temperature brittleness and corrosion at the root.
Working mechanism and performance characteristics
The excellent performance of 15CrNi3MoV(A) stems from its elaborate alloying design and heat treatment process:
- Synergy of nickel and chromium: A nickel content of about 3% significantly improves low-temperature impact toughness (Akv ≥ 60J at -40℃); a chromium content of about 1% forms a dense passivation film, effectively resisting chloride ion erosion.
- Strengthening of molybdenum and vanadium: Molybdenum improves tempering stability and enhances pitting corrosion resistance; vanadium refines grains, achieving fine-grain strengthening and a match between strength and toughness.
- Ultra-pure smelting: Through LF + VD refining, S and P are controlled to ≤ 0.015%, reducing inclusions and avoiding brittle fracture caused by stress concentration.
| Item | Typical value |
| Tensile strength Rm | ≥ 850 MPa |
| Yield strength Rp0.2 | ≥ 650 MPa |
| Elongation after fracture A | ≥ 15% |
| Impact energy Akv(-40℃) | ≥ 60 J |
| Hardness (after quenching and tempering) | 280-330 HBW |
Product advantages include:
- Complete specifications: The diameter of the round steel ranges from 16 to 300mm. Surface states such as black skin, polished, and precision-turned can be provided to meet different machining allowance requirements.
- Batch stability: Each steel bar has undergone chemical composition, mechanical property, and ultrasonic flaw detection to ensure consistent quality.
- Customized service: According to the specific working conditions of customers, the tempering temperature can be adjusted to obtain a specific combination of hardness and toughness.
- Resistant to seawater corrosion: In the 3.5% NaCl salt spray test, the corrosion rate is only 1/3 of that of ordinary alloy steel, which is suitable for seawater pipelines, pumps, valves, and structural parts.
Trust endorsement and consulting advice
Since its establishment, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has always adhered to the business principle of "seeking truth from facts and being honest". It has accumulated high evaluations among peers and customers. We provide stable supplies to many ship supporting enterprises and marine engineering companies, with an average monthly delivery of over 500 tons of special steel bars. Each batch of products comes with a material certificate and traceable furnace number information. We understand that material selection is related to equipment safety and operating costs. Therefore, we suggest that customers fully communicate with our technical team based on the specific operating temperature, medium environment, and stress conditions. Professional engineers will recommend the best specifications and delivery states. Welcome to contact us to obtain the technical parameter table or send samples for actual testing. We are willing to contribute to the success of your project with professional services.
FAQ
1. What's the difference between 15CrNi3MoV and 15CrNi3MoVA?
The suffix "A" indicates high-quality steel, which requires lower P and S content (≤0.025%), higher smelting quality, and better purity. It shows more stable performance in low-temperature toughness and corrosion resistance. Our company can supply both grades according to your technical agreement.
2. Can this round steel be used in a -60℃ environment?
This steel grade is typically designed for -40℃ working conditions. If -60℃ impact toughness is required, the Akv can still be ≥47J by optimizing the heat treatment (such as increasing the tempering temperature or using isothermal quenching). However, the specific process flow needs to be confirmed with our technical team in advance.
3. Is additional coating protection required in a seawater corrosion environment?
Although 15CrNi3MoV(A) itself has better seawater corrosion resistance than ordinary steel, in high-flow seawater or strong impact corrosion situations, it is recommended to use it in combination with epoxy coatings or cathodic protection to extend the full life cycle.
4. How to ensure the core performance of round steel with a diameter of 300mm?
For large-diameter bars, by strictly controlling the forging ratio (≥5), adopting the water-air alternating quenching process, and strengthening the ultrasonic flaw detection of the core, the uniform structure of the whole cross-section is ensured, and the impact energy of the core is not less than 80% of the edge value.
5. What about the welding performance of this material?
The carbon equivalent of this steel is about 0.45%, which belongs to the weldable category. It is recommended to preheat at 150-200℃, slow cooling after welding and immediately conduct stress relief annealing. The welded joint can reach ≥40J in the impact test at -40℃. We can provide recommended welding process parameters.
6. Can you provide precision ground bars with a small diameter (16mm) for precision machining?
Yes. For the specifications of 16-50mm, we can supply ground round steel with a surface accuracy of Ra≤1.6μm and the tolerance controlled at h9 level, which can be directly used for CNC lathe machining, reducing the user's processes.
7. How long is the delivery time for in-stock products?
There is a standing inventory of about 200 tons for conventional specifications (diameter 16-100mm), and they can be shipped within 3-5 days; large-diameter or special quenched and tempered states need to be produced according to orders, and the delivery time is about 15-20 days.
8. Do you provide third-party inspection reports?
We can entrust authoritative institutions such as SGS and BV to conduct chemical composition, mechanical properties and corrosion tests. The report fees need to be negotiated separately. The regular factory inspection reports are provided with the goods.
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