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Help CenterGerman Standard Low-alloy Chromium-molybdenum 50crmo4 Quenched and Tempered Round Steel, American Standard Sae 4150 Steel Bar, Customizable From 16 to 600, Cutting Available
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Industry Pain Points and Solutions
In the fields of heavy - duty machinery, mining equipment, and petrochemical industry, key transmission components are long - term subjected to impact, alternating stress, and harsh working conditions. Ordinary carbon round steel often breaks, wears out rapidly, and has a sharply reduced service life due to insufficient strength, lack of toughness, or excessive heat - treatment deformation. To address this core industry pain point, Liaocheng Jincheng Yangming Special Steel Co., Ltd., relying on years of experience in special steel production, carefully selects German - standard low - alloy chromium - molybdenum 50CrMo4 (American - standard SAE 4150) quenched and tempered round steel. By strictly controlling the smelting composition and optimizing the quenching and tempering process, the company significantly improves the strength - toughness matching and dimensional stability of the steel, effectively solving the problem of insufficient comprehensive performance of materials in high - stress environments.
Company Background and Technological Improvements
Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng City, Shandong Province. It is an enterprise mainly engaged in the wholesale industry and deeply involved in special steel. Its main products include precipitation - hardening steel, duplex steel, heat - resistant steel, corrosion - resistant alloys, austenitic steel, martensitic steel, and other special steels. The products are widely used in industries such as petroleum, chemical, shipbuilding, nuclear engineering, aerospace, mining, textile, and construction machinery. The company adheres to the business principles of seeking truth from facts and honesty, and has accumulated a good reputation in the industry. For 50CrMo4 round steel, we use the electric arc furnace + refining + vacuum degassing process to strictly control the content of impurity elements and gases. In the quenching and tempering stage, we adopt precise quenching and high - temperature tempering parameters to enable the steel to obtain a uniform tempered sorbite structure, effectively releasing internal stress. Thus, while ensuring high strength, the steel also has excellent plasticity and toughness, eliminating the defect of large performance dispersion of traditional quenched and tempered round steel.
Working Mechanism and Product Features
The core working mechanism of 50CrMo4 quenched and tempered round steel is: obtain martensite through quenching (rapid cooling after austenitizing by heating to 30 - 50°C above Ac3), and then decompose the martensite through high - temperature tempering (540 - 680°C) to form a fine and dispersed tempered sorbite structure. This structure endows the material with high strength (tensile strength ≥1080MPa), high yield ratio (yield strength ≥930MPa), and good plasticity and toughness (elongation ≥12%, impact energy ≥63J). At the same time, the chromium and molybdenum elements improve the hardenability, tempering stability, and hydrogen embrittlement resistance of the steel, making it suitable for quenched and tempered parts with large cross - sectional dimensions.
- Balance between High Strength and High Toughness: After quenching and tempering, both the tensile strength and yield strength are at an advanced level in the industry. At the same time, it maintains sufficient elongation and impact toughness, effectively avoiding brittle fracture.
- Good Hardenability: The addition of alloying elements Cr and Mo enables the round steel with a diameter of up to 600mm to obtain a relatively deep hardened layer, and the mechanical properties of the core are stable.
- Stable Quenched and Tempered State: The company uses segmented heating and controlled cooling technology, combined with the optimization of the tempering process, to ensure that the hardness and structure of the whole batch of steel are uniform, reducing subsequent heat - treatment deformation.
- Excellent machining performance: The quenched and tempered round steel can be directly subjected to mechanical processing such as turning, milling, and drilling. It has a high surface finish and causes little wear to the cutting tools.
- Flexible size customization: The diameter ranges from 16 to 600mm. The original length can be provided, or it can be precisely cut according to the customer's requirements to reduce the waste of surplus materials.
Technical specifications and parameters
| Item | Parameter value (typical range) |
| Carbon (C) | 0.47 - 0.55% |
| Chromium (Cr) | 0.90 - 1.20% |
| Molybdenum (Mo) | 0.15 - 0.30% |
| Manganese (Mn) | 0.50 - 0.80% |
| Silicon (Si) | ≤0.40% |
| Tensile strength (Rm) | ≥1080 MPa |
| Yield strength (Rp0.2) | ≥930 MPa |
| Elongation after fracture (A) | ≥12% |
| Impact energy (KV) | ≥63 J (20°C) |
| Hardness (HBW) | 305 - 375 (quenched and tempered state) |
Application industries and scenarios
- Mining machinery: Components subject to impact, such as crusher shafts, gears, and main shafts of cone crushers.
- Petrochemical industry: Corrosion - resistant and fatigue - resistant parts, such as pump shafts, valve stems, high - pressure vessel flanges, and drill pipe joints.
- Shipbuilding and offshore engineering: High - strength and tough components, such as propeller shafts, rudder stocks, and capstan shafts.
- Heavy - duty transmission: Automobile half - shafts, large - scale reducer gears, and rolling mill roller table shafts.
- Molds and tooling: Tooling requiring comprehensive performance, such as hot - working mold frames and injection molding machine plungers.
Trust Endorsement and Advantages
Liaocheng Jincheng Yangming Special Steel Co., Ltd. has been supplying high-quality alloy steel and special steel for a long time. Its products have served multiple fields such as petroleum, chemical industry, shipbuilding, nuclear engineering, aerospace, mining, textile, and construction machinery. The company has a wide range of customers and stable and continuous cooperation. Adhering to the principle of "seeking truth from facts and being honest", the company strictly implements internal control standards in every link from raw material procurement, smelting, rolling to quenching and tempering and cutting. We are well aware that improper material selection may lead to equipment failure and even safety accidents. Therefore, we conduct chemical composition, mechanical property and ultrasonic flaw detection tests on each batch of the steel products leaving the factory to ensure that they meet the requirements of German standard DIN EN 10083 - 3 and American standard ASTM A29. At the same time, the company provides convenient customized cutting services (the length of the round steel can be set, and the cut is flat without burrs), which helps users prepare materials accurately and reduce processing costs.
Consultation and Suggestions
If you are looking for an alloy round steel with both high strength and good toughness to cope with harsh working conditions, or you need to upgrade your existing materials, it is recommended to evaluate from the following aspects: 1) Confirm the material standard and the actual operating temperature range; 2) Match the hardness and toughness levels according to the type of stress; 3) If you have requirements for welding or subsequent heat treatment, communicate with our technical team in advance. Welcome to contact Liaocheng Jincheng Yangming Special Steel Co., Ltd. We will provide you with material property data sheets, inventory specification lists and free cutting samples to make your products more reliable and durable.
FAQ
- Q: Are 50CrMo4 and SAE 4150 completely equivalent? A: Their chemical compositions are similar, but the standard systems are different. 50CrMo4 follows the DIN EN standard and has stricter control over impurities such as sulfur and phosphorus; SAE 4150 is under the American AISI/SAE standard with a slightly wider allowable range. In actual use, they are often considered interchangeable, but for critical applications, it is recommended to purchase according to the original design standard.
- Q: Can the core properties of a round steel with a diameter of 600mm meet the requirements after quenching and tempering? A: 50CrMo4 has good hardenability, but the cooling rate of the core of a large-section steel is slow, so the hardness and strength at the core will be slightly lower than those at the surface. Our company optimizes the alloy composition (appropriately raises the lower limits of Cr and Mo contents) and adjusts the quenching medium (water - oil dual - liquid quenching) to ensure that for round steel with a diameter ≤ 600mm, the hardness difference from the surface to the center is controlled within the allowable range of the standard, and the mechanical properties meet the requirements of most engineering designs.
- Q: Can the quenched and tempered round steel be directly used for welding? A: The quenched and tempered round steel needs to be pre - heated (200 - 300°C) before welding, and should be slowly cooled and immediately stress - relieved and tempered after welding. Otherwise, martensite is likely to form in the heat - affected zone of the weld, leading to cracking. It is recommended to conduct mechanical verification on the welded joints or select materials with better weldability.
- Q: What is the dimensional tolerance for customized cutting? A: Our company can control the cutting length tolerance within ±3mm. For parts with higher precision requirements, we can provide sawing + face milling services. The diameter tolerance is in accordance with the national standard for hot-rolled round steel (e.g., GB/T 702 Group II).
- Q: What heat treatment and subsequent processing (such as carburizing and nitriding) is this material suitable for? A: 50CrMo4 is a quenched and tempered alloy steel with a relatively high carbon content, so it usually does not require carburizing. However, nitriding treatment (such as gas nitriding and ion nitriding) can be carried out to improve surface wear resistance and fatigue limit. Before nitriding, it is necessary to ensure a uniform quenched and tempered structure and a stable core hardness.
- Q: How to ensure the stability of mechanical properties between batches? A: Starting from steelmaking, the company uses LF furnace refining + VD vacuum degassing, and the composition is fine-tuned through on-line analysis by a spectrometer. After rolling, each bar is subjected to ultrasonic flaw detection. Random samples are taken from each batch for tensile, impact, and hardness tests, and the data is archived for traceability. At the same time, regular comparisons and verifications are made with third-party testing institutions to ensure the accuracy of the data.
- Q: Are there any defects on the surface of the round steel? Does it need additional turning? A: The surface of our company's products after rolling has no visible defects such as cracks and folds to the naked eye, and the roughness meets the standard for hot-rolled round steel. However, if it is used for high-precision mating surfaces, in order to remove the decarburized layer or ensure the dimensions, it is recommended to reserve a machining allowance of 0.5 - 1mm.
- Q: Is this material suitable for use in low-temperature environments? A: The quenched and tempered 50CrMo4 has sufficient low-temperature toughness above -20°C (usually KV ≥ 27J). If the working temperature is lower than -40°C, it is recommended to choose low-temperature steels (such as 16MnDR or 9Ni steel), or consult our company's technical department for special test results.
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