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ST52 SEAMLESS MECHANICAL STEEL PIPE
- Commodity name: ST52 SEAMLESS MECHANICAL STEEL PIPE
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- 产品描述
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ST52 seamless mechanical pipe is a high-quality steel pipe widely used in the industrial field.
1. Material Standards And Grades
Standard system: It belongs to the European DIN/EN standards (such as EN 10297, EN 10210), corresponding to the German DIN 17100 standard.
Grade analysis: ST52 is a Structural Steel grade, where "ST" stands for structural steel and "52" indicates a minimum tensile strength of 520 MPa (the actual strength is usually higher).
2. Chemical Composition (Typical Values)
Element C (Carbon) Si (Silicon) Mn (Manganese) P (Phosphorus) S (Sulfur)
Content ≤0.20% ≤0.55% 1.00-1.60% ≤0.035% ≤0.035%
Features: Medium carbon content balances strength and weldability, high manganese content enhances toughness, and low sulfur and phosphorus improve processing performance.
3. Mechanical Properties
Tensile strength (Rm) : 510-650 MPa
Yield strength (Re) : ≥355 MPa
Elongation (A5) : ≥21% (gauge length 5 times diameter)
Impact toughness: ≥27J at room temperature (low-temperature impact may be required depending on specific standards)
4. Manufacturing Process
Hot-rolled seamless tubes: Through hot piercing and rolling, they are suitable for large diameters (such as φ219mm and above) and have a relatively low cost.
Cold-drawn seamless tubes: Precision cold processing, high dimensional accuracy (tolerance ±0.1mm), smooth surface (Ra≤0.8μm), suitable for precision components such as hydraulic cylinders.5. Core advantages
- Welded-free structure: Eliminates weld weaknesses and leakage risks, and its pressure resistance is increased by more than 30% compared to welded pipes.
- High strength and lightweight: The yield strength is approximately 40% higher than that of ordinary carbon steel (such as ST37), making it suitable for weight reduction design.
- Processing adaptability: It can be turned, welded (low-hydrogen electrodes are recommended), and cold-bent (bending radius ≥3 times the pipe diameter)
6. Typical application scenarios
- Construction machinery: Excavator hydraulic cylinders, crane booms (need to withstand dynamic loads)
- Automobile manufacturing: Drive shafts, steering system components (requiring high fatigue strength)
- Energy equipment: high-pressure boiler tubes (working pressure ≥20MPa), geothermal well casing
- Special equipment: Gas cylinders, high-pressure reactors (required to pass ISO 9809 certification)
7. Surface treatment and anti-corrosion
- Galvanizing: The thickness of the hot-dip galvanized coating is ≥85μm (EN ISO 1461), and the salt spray resistance test is > 1000 hours.
- Coating: Epoxy resin coating (200-400μm in thickness) is suitable for chemical corrosive environments.
- Phosphating: Improves surface lubricity and is often used in the subsequent deep processing of cold-drawn tubes.
8. Precautions for selection
- Standard differences: EN 10297-1 (General Mechanical tubes) and EN 10216-2 (pressure tubes) have different requirements for impact tests.
- Dimensional accuracy: Cold-drawn tubes can be selected as H9 (precision grade) or H11 (standard grade), while hot-rolled tubes are mostly H12-H13 grades.
- Heat treatment state: Normalizing (+N) state can enhance low-temperature toughness and is suitable for environments below -20℃.
9. Market benchmarking products
- International benchmarking: ASTM A519 of the United States (corresponding grade 4140), STKM13C of Japan (JIS G3441)
- Cost comparison: 40-60% lower than that of stainless steel pipes, but the full life cycle cost needs to be evaluated in a corrosive environment.
ST52 seamless mechanical tubes, with their balanced performance combination, occupy an important position in industrial scenarios that require high strength, reliability and economy. When actually selecting the model, it is recommended to conduct material certification (such as CE/PED certification) in combination with specific working condition parameters (such as pressure cycle times, medium corrosiveness).
Core Advantage
Brisk Steel Group is rooted in a culture of "technology as the backbone, quality as the soul, and customers as the heart." Through relentless innovation, global expansion, and a commitment to responsibility, we strive to become a trusted global partner and a technological benchmark in the steel manufacturing industry.
Craftsmanship with Precision
We adhere to a rigorous quality control system that spans the entire production process—from raw material procurement and manufacturing to product delivery—ensuring the highest standards of excellence.
Innovation-Driven Technological Leadership
We prioritize R&D and technological advancement, integrating cutting-edge production lines (e.g., JCOE large-diameter LSAW pipe production) and expert teams from countries like Germany and the Netherlands to maintain our position at the forefront of the industry.
Globalization and Open Collaboration
Actively engaging in the global supply chain, we have obtained international certifications such as CE marking, enabling our products and services to reach worldwide markets.
Professional Team and Talent Empowerment
We value the recruitment and development of technical talent, building an international and professional team that drives continuous growth.
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