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Help CenterRound Steel for German Standard Power Station Steam Turbine 26nicrmo14-6, European Standard Rotor Bolt 1.6958 Alloy Round Bar
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Industry Pain Points and Solutions: During the operation of power station steam turbines, the rotor bolts are subjected to high temperatures (500-600℃), high-pressure steam, and complex alternating stresses for a long time. Ordinary alloy steels are prone to stress relaxation, fatigue fracture, or hydrogen embrittlement failure, which seriously threatens the safety of the unit. At the same time, the bolt material needs to have high resistance to temper softening, excellent low-temperature impact toughness, and strict structural uniformity. Liaocheng Jincheng Yangming Special Steel Co., Ltd. deeply understands this industry demand. Relying on years of experience in special steel supply, it provides high-quality alloy round steel of 26NiCrMo14-6 (1.6958) for the key material requirements of German standard power station steam turbine rotor bolts. Through strictly controlled chemical composition and optimized heat treatment process, this grade effectively improves the anti-relaxation performance and long-term strength of the material, while ensuring good workability and a good match between strength and toughness, providing a reliable material basis for the long-term safe operation of power station equipment.
Working Mechanism and Characteristics: 26NiCrMo14-6 is a quenched and tempered alloy structural steel of the Ni-Cr-Mo system. Its strengthening mechanism mainly obtains a tempered sorbite structure through quenching + high-temperature tempering, ensuring high strength while having excellent toughness and plasticity. The alloying element Ni improves hardenability and low-temperature toughness, while Cr and Mo enhance thermal strength and tempering resistance. This material undergoes vacuum degassing, refining, and forging to form a billet, with a dense structure and low inclusion content, making it especially suitable for manufacturing rotor bolts with large cross-sections and complex stress conditions. The product features include:
- High Hardenability: A uniform quenched and tempered structure can be obtained even for large cross-sections (above φ300mm), with stable core properties.
- Excellent Anti-Relaxation Performance: The stress decreases slowly under long-term high-temperature service conditions, ensuring long-lasting pre-tightening force.
- Excellent Fatigue Strength: Through refined grain size and purity control, the fatigue life is significantly better than that of ordinary 42CrMo.
- Broad Adaptability: It can be supplied in various delivery states such as black skin, turned, and peeled to meet different processing needs.
- Strict Quality Control: Each batch of products is inspected for chemical composition, mechanical properties, macrostructure, ultrasonic flaw detection, etc., and EN 10204 3.1 or 3.2 certificates can be provided.
Technical Specifications and Parameters: The following are typical reference data. The actual supply shall be in accordance with DIN EN 10269 or the customer's technical agreement.
| Parameter Item | Typical value/Range |
|---|---|
| Carbon C | 0.22～0.29% |
| Silicon Si | ≤0.40% |
| Manganese Mn | 0.50～0.80% |
| Chromium Cr | 1.30～1.70% |
| Molybdenum Mo | 0.30～0.50% |
| Nickel Ni | 3.30～3.80% |
| Tensile strength Rm | ≥880 MPa (Quenched and tempered) |
| Yield strength Rp0.2 | ≥685 MPa |
| Elongation after fracture A | ≥13% |
| Impact energy KV (20℃) | ≥40 J |
| Hardness | 269～321 HBW |
| Standard | DIN EN 10269, ISO 4954 |
Application advantages and trust endorsement: Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng, Shandong. It is specialized in the wholesale and processing of special steel, mainly dealing in precipitation hardening steel, duplex steel, heat-resistant steel, corrosion-resistant alloys, etc. Its products are widely used in high-end fields such as petrochemical, shipbuilding, aerospace, and power stations. The company adheres to the business philosophy of "seeking truth from facts and being honest", and has accumulated a good reputation in the industry. For 26NiCrMo14-6 round steel, we always have stocks covering common specifications (φ50-200mm), and can accept customized length and tolerance requirements. Each batch of materials has undergone strict incoming inspection and process review to ensure that the material certificate is consistent with the actual product. We are well aware that power station bolts have extremely high requirements for reliability, so the whole process from raw material procurement to processing and distribution is traceable. If you are looking for a stable and reliable German standard rotor bolt material, welcome to contact us for technical exchanges. Our sales engineers can recommend the best heat treatment parameters and machining allowances according to your specific working conditions to help you optimize product performance. Please call or make an inquiry through the platform, and we will provide you with a detailed quotation and material certificate as soon as possible.
FAQ:
- 1. What are the core advantages of 26NiCrMo14-6 compared with 42CrMo in the application of turbine bolts? Answer: 42CrMo is a medium-carbon alloy steel with low hardenability, and it is difficult to ensure the core performance of large cross-sections. In addition, its relaxation resistance and high-temperature strength are inferior to those of 26NiCrMo14-6. 26NiCrMo14-6 has a high Ni content and good hardenability. A uniform sorbite structure can be obtained in large-section bolts, and it has stronger tempering resistance and a longer service life when working below 550°C.
- 2. Does this material need special heat treatment? What are the common processes? Answer: Usually, quenching + high-temperature tempering (quenching and tempering treatment) are adopted. The quenching temperature is 860-890°C, and oil cooling or water-based medium cooling is used. The tempering temperature is 580-660°C, which is adjusted according to the target hardness. For large-section parts, attention should be paid to preheating and uniform cooling. Liaocheng Jincheng Yangming Special Steel Co., Ltd. can supply the material in the blank state or according to the final heat treatment agreement.
- 3. How to control the delivery length and tolerance of this round steel? Answer: The conventional delivery length is 4-6 meters, and it can also be provided according to the fixed length (up to 12 meters). The diameter tolerance complies with the DIN EN 10060 standard, usually at the h11 - h9 level. If stricter tolerance is required, communication in advance is necessary.
- 4. Does the material have good machining performance? What should be noted during turning and milling? Answer: This steel has a relatively high hardness (about 280-320 HB) in the quenched and tempered state. It is recommended to use carbide tools during machining, adopt medium cutting speed and feed rate, and provide sufficient cooling. If it is necessary to reduce the hardness for rough machining, the annealed state can be provided, with a hardness lower than 240 HB.
- 5. Does the product come with a third-party inspection report? Answer: Liaocheng Jincheng Yangming Special Steel Co., Ltd. usually provides a material report (EN10204 3.1). If third-party inspection (such as SGS, BV) or a higher-level certificate (3.2) is required, we can assist in arranging it, and the cost will be charged separately. All materials can be traced back to the furnace number.
- 6. How to confirm whether the material works at a temperature above 550°C for a long time? Answer: The long-term service temperature of 26NiCrMo14-6 generally does not exceed 550°C. If the working temperature is higher, it is recommended to choose heat-resistant alloys such as 1.4913. Our technical team can provide material selection suggestions based on parameters such as your working temperature, pre-tightening force, and size.
- 7. What is the general supply cycle? Answer: Common specifications (φ50-150mm) are usually in stock and can be shipped in 3-7 days. Large sizes or special requirements need to be customized, and the cycle is 15-25 days. The specific cycle depends on the order volume.
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