Forged Gas & Steam Turbine Disks | Turbine Blisk | China Leading Manufacturer

Professional China Jiangyin Turbine Forging Manufacturer

Established in 1997, Jiangsu Liangyi Co., Limited is a China leading ISO 9001:2015 certified manufacturer of high-performance forged gas turbine disks, forged steel steam turbine discs, and high pressure (HP) turbine blisks, located in Chengchang Industry Park, Jiangyin City, Jiangsu Province — the core forging industry belt in China. With 25+ years of open die forging experience, an 80,000 ㎡ production base, and 120,000 tons annual manufacturing capacity, we supply custom forged turbine components to clients in over 50 countries across the power generation, aerospace, oil & gas, and marine industries.

Our custom forged turbine components are exported to the United States, Germany, United Kingdom, France, Italy, Spain, Netherlands, Belgium, Sweden, Norway, Denmark, Finland, UAE, Saudi Arabia, Qatar, Kuwait, Oman, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Australia, New Zealand and more. As the core rotating component of gas and steam turbines, turbine disks and turbine blisks operate under extreme conditions of high temperature, high pressure, high-speed rotation, and cyclic loading. Our forged turbine components are engineered to deliver exceptional fatigue resistance, high-temperature creep performance, and long service life, fully compliant with ASTM, AMS, DIN, EN, API, and other international standards.

Gas Turbine Disks vs Steam Turbine Discs: Key Technical Differences

Although both gas turbine disks and steam turbine discs are core rotating components in their respective systems, they face fundamentally different operating environments — which drives distinct material selection, melting processes, heat treatment protocols, and inspection standards. Understanding these differences is essential for correct engineering specification and material sourcing.

Jiangsu Liangyi maintains separate material procurement, melting process selection, heat treatment protocols, and NDT requirements for gas turbine disk and steam turbine disc production. Our engineering team reviews each inquiry's operating conditions and specifies the correct material-process combination before quotation.

HP, IP & LP Turbine Disk: Stage-by-Stage Technical Requirements

Turbine disks are not interchangeable across pressure stages. Each stage imposes a distinct set of thermomechanical conditions that determine material grade, forging process, heat treatment, and acceptance testing. Following is a stage-by-stage technical breakdown for our custom forged turbine disks.

Turbine Disk Failure Mechanisms & How Our Forging Process Addresses Them

Every step of our forging and quality control process is engineered to counter specific turbine disk failure modes. This section explains the five primary failure mechanisms and our precise technical responses — understanding this is what differentiates a professional turbine forging manufacturer from a general forging supplier.

① Low Cycle Fatigue (LCF) — Primary Failure Mode of Gas Turbine Disks

Mechanism: Gas turbine disks undergo a complete load cycle with every engine start-stop. At each start-up, the disk bore heats rapidly while the rim lags, creating large cyclic compressive-to-tensile thermal stress transients. Combined with sustained centrifugal tensile stress at the bore under high RPM, this cyclic loading propagates fatigue cracks — typically initiating from non-metallic inclusions, surface defects, or segregation bands. LCF-driven disk fracture is catastrophic and is the primary design-limiting failure mode for HP gas turbine disks.

How our forging addresses LCF:

• Triple melted (VIM+ESR+VAR) material (AMS 2300 inclusion rating): Deletes the non-metallic inclusions that are the primary LCF crack initiation sites. A single Type B inclusion >0.5 mm in a production-grade superalloy can reduce LCF life by 30–50%.
• Controlled deformation ratio ≥3:1: Sufficient forging reduction breaks down cast dendritic matrix and gets a consistent fine equiaxed grain (ASTM 5–8). Coarse grain or banded microstructure from inadequate reduction significantly reduces LCF life.
• Forging temperature control ±10°C: Forging Inconel 718 below the delta-phase solvus (≤1,025°C) creates a microstructure with fine grains and high strength. Forging above this temperature creates a microstructure with coarse grains and lower LCF performance.
• Residual stress management: Controlled post-forging cooling and aging minimize tensile residual stresses at the disk bore, reducing crack initiation probability at the highest-stress location.
• LCF test verification: LCF specimens are cut from actual forging locations (not representative bar), ensuring the forging's tested microstructure reflects the delivered component.

② High-Temperature Creep — Limiting Factor for HP Turbine Disk Life

Mechanism: At temperatures above ~0.4 × melting point (T_m), metallic alloys are given time-dependent plastic deformation under sustained stress — creep. For HP turbine disks at 550–700°C under centrifugal stress, creep leads to bore elongation, blade root slot distortion, and eventual rupture. Creep rate is exponentially sensitive to both temperature and stress.

How our forging addresses creep:

• Temperature-matched superalloy choice: Inconel 718 (γ'' precipitation hardening, stable to 650°C), Waspaloy (γ' strengthening, stable to 760°C), and Nimonic 80A (stable to 815°C) were chosen based on the disk's actual operating temperature, not just the price.
• Precisely controlled aging heat treatment: For Inconel 718, the standard double aging cycle (718°C/8h FC → 621°C/8h AC) produces optimal γ'' precipitate size and distribution for creep resistance. Full time-temperature graph records issued for every batch.
• Creep & stress rupture testing: We do high-temperature creep tests at certain temperature and stress levels (according to ASTM E139) to make sure the product will work well for a long time before we send it out.

③ Stress Corrosion Cracking (SCC) — Critical Risk for LP Steam Turbine Discs

Mechanism: In the wet steam zone of LP turbine stages, disk surfaces contact corrosive condensate (dilute chlorides or caustic solutions) simultaneously with high tensile centrifugal stress. The combination of stress + corrosive environment + susceptible microstructure produces SCC — a crack that grows subcritically at stress intensities far below the conventional fracture toughness K₁C. Historical LP turbine disc SCC failures have caused catastrophic disk fractures in power stations worldwide.

How our forging addresses SCC:

• Ultra-low S (≤0.005%) and P (≤0.008%) content: Achieved through EAF+LF+VD melting for LP turbine disc alloy steels, suppressing hydrogen-induced SCC initiation at sulfide inclusions.
• Controlled hardness level: Higher hardness directly increases SCC susceptibility. We control final tempered hardness to 248–311 HB for 26NiCrMoV11-6 LP discs — below the threshold where SCC becomes critical in steam environments.
• KISCC fracture mechanics testing: For important LP turbine discs, we perform KISCC (SCC threshold stress intensity) testing in simulated steam environments, confirming actual SCC resistance under service conditions.
• Compressive residual stress: Controlled quenching imparts compressive residual stresses at disk surfaces, counteracting service tensile stresses and reducing SCC crack initiation probability.

④ Thermal Fatigue Cracking — Disk Bore and Blade Root Slots

Mechanism: Rapid temperature cycling during engine start-stop, load changes, and emergency shutdowns creates cyclic thermal strains at stress concentration sites — particularly the disk bore, fir-tree blade root slots, and cooling holes. Combined thermal + mechanical fatigue at these sites initiates cracks after a finite number of severe thermal cycles.

Our technical response: Forged disks with fine, uniform grain structure and optimized alloy composition have significantly higher thermal fatigue resistance than cast components. Our forging process ensures no centerline segregation or macro-segregation (verified by mandatory macro-etching inspection), which are the primary weak points for thermal fatigue crack initiation in large turbine disks.

⑤ Fretting Fatigue — Blade Root and Disk Interface

Mechanism: Micro-slip at the contact interface between turbine blade roots (fir-tree or dovetail) and disk slots, driven by blade vibratory stress during operation, causes fretting wear and fretting fatigue crack initiation. This is particularly critical for IP turbine disks with higher vibratory blade stress.

Our technical response: Controlled surface roughness (Ra ≤ 1.6 μm at all blade root contact surfaces) from precision finish machining, combined with tight hardness uniformity (maximum 30 HB variation across disk cross-section), minimizes fretting fatigue susceptibility. All blade root slot dimensions are verified with precision gauging to confirm geometry accuracy and contact conformance.

High-Purity Melting Process & Material Grades with Performance Data

All our forged gas and steam turbine disks are manufactured with high-purity raw materials using industry-leading vacuum melting processes to ensure material uniformity, non-metallic inclusion control, and stable mechanical properties.

Melting Process Selection Guide

Material Mechanical Performance Data

The following table provides minimum mechanical property requirements for our most commonly supplied turbine disk materials. All values are at room temperature (20°C) unless noted. High-temperature tensile data (at 450°C, 550°C, 650°C, 750°C) and creep rupture data are available upon request. Learn more about our forging materials.

Note: All values are minimums per applicable standards. Actual test results on delivered forgings typically exceed these values. High-temperature tensile data at 450°C, 550°C, 650°C, and 750°C, and creep rupture data, are available on request for each material grade. All supplied with full MTC per EN10204 3.1 (or 3.2 with TPI witness).

Full Material Grade Availability

Forged vs Cast Turbine Disk: Why Forging is Mandated for Rotating Components

Forging is not merely preferred — it is mandated by all major international engineering codes (ASTM, AMS, API, EN, DIN) for rotating turbine disk applications. The reason is fundamental metallurgy: the manufacturing process determines microstructure, and microstructure determines fatigue performance under cyclic stress. The comparison below is based on established materials science data.

Full One-Stop Manufacturing Process with Key Process Parameters

Jiangsu Liangyi controls the entire manufacturing chain in-house — from raw material melting to finished, assembly-ready turbine disk or blisk. Our production equipment includes a 6,300T hydraulic press, 2,000T fast forging machine, 5M ring rolling machine, 10+ heat treatment furnaces, and a full in-house inspection laboratory.

1. Raw Material Procurement & Vacuum Melting
   Certified ingots from qualified superalloy producers. Melting: VIM+ESR+VAR (aerospace/HP) / VIM+VAR (industrial) / EAF+LF+VD (alloy steels). Full heat chemical analysis per ASTM E1086 / E1019. Inclusion rating per AMS 2300 / 2303 (Ni alloys) or ASTM E45 (steels).
2. Ingot Homogenization Anneal
   High-temperature soak to dissolve as-cast chemical segregation before forging. Typical: 1,100–1,200°C × 10–24 hours (alloy-specific). Minimizes micro-segregation that would otherwise persist through forging and cause property variability.
3. Open Die Forging (6,300T Hydraulic Press / 2,000T Fast Forging Machine)
   Alloy-specific forging temperature windows: Inconel 718: 954–1,025°C (below δ-phase solvus for fine grain); Waspaloy: 1,065–1,135°C; Nimonic 80A: 1,050–1,120°C; X22CrMoV12-1: 1,050–1,200°C; 26NiCrMoV11-6: 1,050–1,180°C. Minimum deformation ratio ≥3:1 for full microstructure homogenization. Multiple heats used for disks >2,000 mm to maintain temperature uniformity across the workpiece.
4. Seamless Ring Rolling (5M Ring Rolling Machine)
   For ring-geometry turbine disks (typically LP steam turbine discs): controlled temperature ring rolling achieves circumferential grain alignment and near-net-shape profile. Max ring OD: 5,000 mm; max ring height: 1,200 mm. Eliminates weld seams — no welding-related metallurgical defects or HAZ (heat-affected zone).
5. Multi-Stage Heat Treatment (10+ Vacuum & Atmosphere Furnaces)
   Alloy-specific protocols with documented actual part temperatures:
   • Inconel 718 (AMS 5662): Solution 954°C/1h AC → Age 718°C/8h FC → 621°C/8h AC
   • Waspaloy (AMS 5706): Solution 1,080°C/4h AC → Stabilize 845°C/4h AC → Age 760°C/16h AC
   • X22CrMoV12-1: Normalize 1,040–1,060°C air → Temper 670–720°C (1h/25mm section min.)
   • 26NiCrMoV11-6: Austenitize 850–900°C WQ → Temper 600–650°C
   Full time-temperature graphs, cooling method, and actual part temperature records issued for every batch.
6. Rough Machining (CNC Turning / Milling)
   Scale removal and near-net-shape machining. All surfaces brought to Ra ≤ 6.3 μm for reliable NDT signal-to-noise ratio. Macro-etching inspection on representative cross-section slice (ASTM E340) to verify grain flow, absence of segregation, and centerline integrity.
7. Non-Destructive Testing (NDT) — Full Coverage
   • UT per ASTM A388 / EN 10228-3: full volumetric immersion or contact scan; acceptance: typically FBH Ø2.4 mm (Class C) or Ø1.6 mm (Class D); all operators ASNT Level II/III certified.
   • PT (ASTM E165 / EN 571): all accessible surfaces after rough machining and after finish machining.
   • MT (ASTM E709 / EN 10228-1): ferromagnetic materials only; surface and near-surface detection.
   • Macro-etching: mandatory cross-section slice inspection per ASTM E340.
8. Mechanical Performance Testing (Specimens from Actual Forging)
   • Tensile RT & HT per ASTM E8 / E21 / ISO 6892 / ISO 783
   • Charpy V-notch impact per ASTM E23 at temperatures from −196°C to +177°C as required
   • Brinell / Rockwell / Vickers hardness at 5+ points across disk cross-section (uniformity ≤30 HB for LP discs)
   • Metallographic inspection: grain size (ASTM E112), inclusion rating, microstructure uniformity
   • Creep & stress rupture per ASTM E139 / ISO 204 (when specified)
   • K₁C fracture toughness per ASTM E399; KISCC per ASTM G168 (for critical LP turbine discs)
9. Finish CNC Machining (Precision Tolerance ±0.05 mm)
   Multi-axis CNC turning and milling to final drawing dimensions. Fir-tree and dovetail blade root slots: ±0.01 mm profile tolerance. Surface roughness: Ra ≤ 1.6 μm at all contact surfaces; Ra ≤ 3.2 μm general. Full 3D CMM dimensional verification of all critical dimensions.
10. Final Inspection, Documentation & Packing
    Compile complete EN10204 3.1 or 3.2 traceable inspection dossier (see Quality section below). Export packing with rust-prevention treatment and wooden / steel case per shipping mode. Global delivery from Jiangyin — sea freight, air freight, or express courier.

Full-Process Quality Control & Rigorous Testing

Every finished forged turbine disk and turbine blisk is given strict full-process quality control, from raw material melting to final inspection, making sure all parts meet client specifications and international industry standards. Our in-house testing facility is operated by ASNT Level III certified examiners and Level II qualified inspectors. Learn more about our production equipment.

Mechanical Performance Testing

• Room & High Temperature Tensile Testing (yield strength, UTS, elongation, reduction of area) per ASTM E8 / E21 / ISO 6892 / ISO 783
• Charpy V-Notch Impact Testing (−196°C to +177°C range) per ASTM E23 / ISO 148
• Hardness Testing: Brinell, Rockwell, Vickers — minimum 5 measurement points across disk cross-section; hardness uniformity ≤30 HB for LP turbine discs
• Macro & Micro Metallographic Etching (grain size per ASTM E112, inclusion rating per ASTM E45, microstructure uniformity)
• High Temperature Creep & Stress Rupture per ASTM E139 / ISO 204 (when specified by client or standard)
• Fracture Toughness K₁C per ASTM E399 (for LP steam turbine disc critical applications)
• KISCC Stress Corrosion Cracking Threshold Stress Intensity per ASTM G168 (for LP turbine discs in wet steam service)

Full-Coverage Non-Destructive Testing (NDT)

• Ultrasonic Testing (UT) per ASTM A388 / EN 10228-3: full volumetric immersion or contact scan; typical acceptance: FBH Ø2.4 mm (Class C) or Ø1.6 mm (Class D); all UT operators ASNT Level II/III certified
• Liquid Penetrant Inspection (PT) per ASTM E165 / EN 571: all accessible surfaces after rough machining and finish machining
• Magnetic Particle Inspection (MT) per ASTM E709 / EN 10228-1: surface and near-surface detection for ferromagnetic materials
• Macro-Etching Inspection per ASTM E340: mandatory cross-section slice to verify grain flow, absence of segregation, central porosity, and cracks
• Dimensional & Visual Inspection: 3D CMM, precision gauging, surface roughness (Ra) measurement at all critical surfaces

Full Traceable Inspection Documentation

All finished forged turbine discs are supplied with a complete, fully traceable inspection dossier:

• Unique part identification: material number, order number, drawing number, specification number, heat number
• Full heat chemical analysis, melting method confirmation, finished product chemical analysis (per ASTM E1086 / E1019)
• Complete heat treatment certification: cooling method, actual part temperature records, holding time, full time-temperature graphs for all stages
• Full NDT records: UT scan maps, PT/MT reports, macro-etching photos, ASNT inspector certification numbers
• All mechanical performance test results (tensile, Charpy, hardness, metallographic); creep, K₁C, KISCC results when specified
• 3D CMM dimensional report, surface roughness records, visual inspection report
• All deviation reports and concession records (if applicable)
• EN10204 3.1 MTC standard; or 3.2 MTC with approved third-party inspector witness (BV / SGS / DNV-GL)

Technical Specifications Overview

Core Application Scenarios

Our custom forged gas and steam turbine disks and blisks are widely used in critical industrial applications worldwide:

• Power Generation: HP/IP/LP steam turbine discs for thermal power plants (coal, gas, oil), combined cycle (CCGT), nuclear (PWR/BWR), and biomass; HP/IP gas turbine disks for peaking and baseload generation
• Aerospace & Defense: HP/IP aero-engine turbine disks and blisks (commercial and military); aero-derivative gas turbine components; helicopter turboshaft engine disks; defense power systems
• Oil & Gas: Gas turbine compressor disks for LNG liquefaction trains and pipeline compressor stations; offshore platform gas turbines; hydraulic fracturing pump drives
• Marine & Shipbuilding: Marine gas turbine disks for naval vessels; steam turbine discs for large vessel propulsion (LNG carriers, cruise ships); offshore vessel and FPSO power systems
• Industrial Drive: Industrial steam turbines for petrochemical plants, refineries, steel mills, cement plants, pulp & paper mills, and sugar mills; mechanical drive gas turbines for compressor trains

Why Choose Jiangsu Liangyi?

As a professional China turbine forging manufacturer with 25+ years of export experience, we provide global clients with one-stop custom forging solutions from steel melting, forging, heat treatment, CNC machining to final inspection. Check our project references to learn more.

• Full In-House Production Capacity: 6,300T hydraulic press, 2,000T fast forging machine, 5M seamless ring rolling machine, 10+ heat treatment furnaces, full inspection laboratory — single piece 30 KG to 30,000 KG, all under one roof
• Deep Turbine-Specific Technical Expertise: Our engineering team understands the failure mechanisms (LCF, creep, SCC) specific to each turbine disk type and pressure stage, and specifies the correct material-melting-heat treatment combination for each application, not just a generic alloy list
• Strict International Standard Compliance: ISO 9001:2015 certified; compliant with ASTM, AMS, DIN, EN, API; NDT per ASTM A388 / EN 10228-3; MTC EN10204 3.1 / 3.2; third-party inspection BV, SGS, DNV-GL
• Stable & Fast Delivery: 25–30 days standard lead time; flexible scheduling for urgent projects; 120,000 tons annual capacity ensures no production bottlenecks
• Competitive China Supply Chain Advantage: Located in China's core forging industry belt in Jiangyin, Jiangsu — direct access to certified superalloy and raw material suppliers, enabling competitive pricing without quality compromise
• 100% Customization Capability: Manufacturing per client drawings from prototype (1 piece, FAI) to mass production — including DFM review, material substitution recommendations, and first article inspection support
• Global Project Experience: Turbine forgings supplied to 50+ countries — Asian thermal power plants, European aerospace projects, Middle East oil & gas, international shipbuilding, and more

Frequently Asked Questions (FAQ)