Specialized Stud Bolt 2Cr1Mo1VNbTiB-Alloy Fastener for Steam Turbine Flanges
As core power equipment in power plants, steam turbines operate under extreme conditions characterized by high temperatures, high pressures, high rotational speeds, and thermal fatigue. Components such as valve stems, studs, bushings, and fasteners demand exceptional high-temperature resistance, creep resistance, corrosion resistance, and mechanical strength.
HuaKai ShengRui has specialized in steam turbine accessory processing for 20 years. We select premium heat-resistant alloys—including 2Cr1Mo1VNbTiB, 2Cr12NiMo1W1V, and 25Cr2MoVA—and follow stringent manufacturing standards. Our high-precision, durable accessories are designed for high-to-medium pressure cylinders, main steam valves, and other critical components, supporting overhauls and technical upgrades for various unit capacities.
1. Product Overview
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Specialized Stud Bolt (2Cr1Mo1VNbTiB): Forged for high-pressure sections (cylinders, flanges, valves). Its superior high-temperature strength ensures connections remain secure and undeformed.
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High-Temp Socket Head Cap Screw (2Cr12NiMo1W1V): Made of martensitic heat-resistant steel. Ideal for bushings and valve covers operating above 500°C.
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Nut (25Cr2MoVA): Precision-machined for pairing with high-pressure studs. High hot-hardness prevents thread stripping and loosening.
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Upper & Lower Bushings (2Cr12NiMo1W1V): Provide support and guidance for valve stems and actuators. These heat-resistant parts ensure coaxiality and minimize friction during reciprocating motion.
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Valve Stem Outer Sleeve (20Cr1Mo1V): A pearlitic heat-resistant steel sleeve that protects the valve stem from thermal shock and provides an insulation barrier.
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Main Steam Valve Stem (2Cr12NiMo1W1V): The core control component of the main steam valve. Precision forged and ground for leak-proof sealing and smooth movement.
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Gasket (0Cr18Ni10Ti): Austenitic stainless steel sealing gasket for flanges and cylinders. Offers excellent resilience to prevent steam leakage.
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Elastic Washer (2Cr12NiMo1W1V): Compensates for thermal expansion gaps between fasteners, preventing stress-induced loosening in high-temperature zones.
2. Technical Features and Specifications
| Product Name | Core Material | Primary Function | Material Properties | Processing & Usage Highlights |
| Specialized Stud Bolt | 2Cr1Mo1VNbTiB | High-pressure fastening | Resists >600°C; high creep strength; excellent thermal fatigue resistance. | Forged blanks + CNC turning; 6g thread precision; quenched and tempered. |
| High-Temp Socket Screw | 2Cr12NiMo1W1V | High-temp component fastening | Martensitic; resists >550°C; outstanding wear and oxidation resistance. | Precision milled socket; rolled threads for higher strength than cut threads. |
| Nut | 25Cr2MoVA | Stud pairing and locking | High hardness at 450°C; anti-relaxation; superior thread engagement. | CNC machined 6H threads; phosphated/blackened surface for corrosion resistance. |
| Upper Bushing | 2Cr12NiMo1W1V | Valve group guidance | Rigid with low thermal expansion; resists medium-induced corrosion. | Precision internal/external grinding (Ra≤0.8μm); prevents valve jamming. |
| Lower Bushing | 2Cr12NiMo1W1V | Bottom support & guidance | Same thermal expansion coefficient as upper bushing; anti-deformation. | Machined as a set with the upper bushing; coaxiality error ≤0.01mm. |
| Valve Stem Outer Sleeve | 20Cr1Mo1V | Insulation & protection | Pearlitic; resists 500°C; low thermal conductivity; resists steam oxidation. | Uniform wall thickness; smooth inner wall to reduce stem thermal deformation. |
| Main Steam Valve Stem | 2Cr12NiMo1W1V | Steam flow regulation | Superior high-temp strength; fatigue resistant; high surface rigidity. | Integrated forging + mirror polishing; scratch-free sealing surfaces. |
| Gasket | 0Cr18Ni10Ti | Steam-tight sealing | Austenitic; high resilience; resists steam corrosion and high toughness. | Precision stamped/cut; uniform thickness for perfect flange contact. |
| Elastic Washer | 2Cr12NiMo1W1V | Anti-loosening / Thermal compensation | Excellent elasticity and fatigue resistance; fast recovery after deformation. | Precision stamping; uniform spring force; prevents thermal stress loosening. |
3. Application Areas
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2Cr1Mo1VNbTiB Studs: Fastening for high-to-medium pressure cylinder flanges and main steam valve bodies.
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2Cr12NiMo1W1V Screws & Washers: Fastening and anti-loosening for bushings and seal components in high-temp zones.
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25Cr2MoVA Nuts: Locking for all high-pressure boiler and turbine studs.
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2Cr12NiMo1W1V Bushings & Stems: Support, guidance, and flow regulation for main steam and governing valves.
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0Cr18Ni10Ti Gaskets: Surface sealing for turbine cylinders, flanges, and high-temp valves.
HKZX-2026-01-28
