X21CrMoV12-1 (1.4926) Forging Steel Parts — China Leading Manufacturer

What Is X21CrMoV12-1 (1.4926)? — Material Definition

Material Name:

X21CrMoV12-1 (also written X21CrMoV12.1, X21CrMoV121, X 21 CrMoV 12 1)

EN Material Number:

1.4926

Material Standard:

EN 10302 – Creep-Resisting Steels, Nickel and Cobalt Alloys

Steel Type:

Martensitic, quenched and tempered, 12% chromium creep-resistant steel

Maximum Service Temperature:

650°C continuous / 700°C short-term

Primary Applications:

Gas turbine rotor shafts, steam turbine blades, valve spindles, seamless rolled rings for power generation and oil & gas industries

Jiangsu Liangyi Co., Limited, established in 1997 and certified to ISO 9001:2015, is a professional China manufacturer of X21CrMoV12-1 (1.4926) open die forging parts and seamless rolled rings. This premium grade of creep-resistant, quenched and tempered 12% chromium steel was specifically developed for extreme high-temperature applications in power generation, oil & gas, and chemical industries.

Compared to conventional low-alloy steels, X21CrMoV12-1 has significantly improved high-temperature performance, so that it is the best choice material for important parts in power generation, oil & gas and chemical processing industries worldwide. Our 1.4926 forgings are exported to more than 50 countries across Europe, North America, Asia, the Middle East, Africa, Oceania and South America.

X21CrMoV12-1 (1.4926) International Equivalent Grades GEO

X21CrMoV12-1 (1.4926) is classified under EN 10302 as a creep-resisting martensitic chromium-molybdenum-vanadium steel. The table below lists the nearest international equivalent designations used in different countries and standards systems. Note: exact chemical compositions may differ slightly between standards.

Note: When specifying X21CrMoV12-1 equivalent in non-European standards, always verify the exact chemical composition and heat treatment requirements for your application. Jiangsu Liangyi can manufacture to any of the above designations upon request.

Comprehensive X21CrMoV12-1 Forged Product Capabilities

 Our advanced production workshops in Jiangyin, Jiangsu, can make a full line of 1.4926 forged steel parts  in many shapes, sizes and styles, to meet strict project needs. We provide a full range of services, from raw material melting and forging, to heat treatment and fine mechanical processing.

Forged Bars & Rods

• Round bars up to 2,000 mm diameter
• Square bars, flat bars and rectangular bars
• Turbine blade steel flat and rectangular bars
• Hollow bars and heavy-wall tubes

Seamless Rolled Rings

• Seamless rolled rings up to 6,000 mm outside diameter
• Guide rings and casing rings for turbines
• Seal rings, labyrinth rings and packing seal rings
• Diaphragm rings and rotor end rings

Gas & Steam Turbine Parts

• Gas turbine and steam turbine rotor shafts
• High pressure (HP) and intermediate pressure (IP) rotors
• Monobloc rotors, shaft ends and hollow shafts
• Gas compressor turbine blades and vanes
• Valve spindles, stems and rods for turbine valves

Industrial Forged Components

• Hubs, housing shells, sleeves and bushes
• Discs, blocks, plates and flanged blanks
• Pipes, tubes, casings and pressure vessels
• Double-headed studs, fasteners and bolts for high-temperature service

Maximum Production Capacity

All our X21CrMoV12.1 forged products are made to the technical requirements of DIN, EN, ASTM and customer-specific specifications as defined in the purchase order. We provide complete mill test certificates (MTC) EN 10204 3.1 as standard with every shipment. EN 10204 3.2 co-signed by an independent third-party inspector is available when arranged by the customer.

X21CrMoV12-1 (1.4926) Global Applications & Project References

Our X21CrMoV12-1 forged parts have been successfully deployed in over 200 important projects worldwide, and they have reliable performance in the most extreme operating conditions. Following are the main application areas and project references:

Power Generation Industry — 65% of Production

Thermal Power Plants

• HP/IP rotors for 600 MW and 1,000 MW thermal power plants in China, India and Southeast Asia
• Steam turbine generator rotor shafts for power stations in Russia and Eastern Europe
• Monobloc rotors for combined-cycle power plants in Germany, France, Italy and Spain
• Turbine blades and vanes for leading European turbine manufacturers

Gas Turbine Applications

• Gas turbine rotor shafts for industrial gas turbines up to 50 MW
• Compressor blades and discs for gas turbine engines
• Combustion chamber parts and exhaust systems

Oil & Gas Industry

• High-temperature valve spindles and stems for oil refineries in Saudi Arabia, UAE and Qatar
• Seal rings and labyrinth seals for offshore platforms in the North Sea and Gulf of Mexico
• High-strength fasteners and studs for subsea equipment operating at up to 600°C
• Pressure vessel parts for LNG processing plants

Chemical & Petrochemical Industry

• Reactor parts and heat exchanger parts for chemical plants in Germany, USA and Japan
• High-temperature piping and tubing for petrochemical refineries
• Furnace parts and catalyst support structures

Other Industrial Applications

• Boiler parts for industrial heating systems
• Shafts and rotors for heavy industrial machinery
• High-temperature furnace parts and heat treatment equipment

Chemical Composition of X21CrMoV12-1 (1.4926) per EN 10302

The precise chemical composition of 1.4926 steel is carefully controlled to guarantee optimal high-temperature mechanical properties and corrosion resistance. Our raw materials are sourced from certified steel mills and undergo rigorous chemical analysis before forging. The following composition meets EN 10302.

We also offer custom chemical composition adjustments to meet specific project requirements, including lower sulfur and phosphorus content (achieved via ESR or VOD refining) for improved toughness, weldability and fatigue performance in critical rotating parts.

Mechanical Properties After Standard Heat Treatment

All X21CrMoV12-1 forged parts go through quenching and tempering (Q+T) heat treatment process to get the needed mechanical properties. We are equipped with ten computerized heat treatment furnaces, enabling consistent heating and cooling across entire workpieces with a tight temperature tolerance of ±5°C.

We can also provide custom heat treatment processes to get certain mechanical properties for special uses, such as  stress relieving, normalizing and tempering at different temperatures. Our in-house metallurgical laboratory performs full mechanical testing to verify conformance before any forging leaves our facility.

Advanced Manufacturing Process & Rigorous Quality Control

At Jiangsu Liangyi, we follow a strict integrated manufacturing process to make sure that every 1.4926 forged part meets the highest quality standards. We control every step from raw material melting to final inspection.

Steel Melting Process

Our X21CrMoV12-1 raw materials are produced using advanced melting technologies to guarantee superior cleanliness and chemical homogeneity:

• Basic Electric Arc Furnace (EAF) melting for initial charge
• Argon Oxygen Decarburization (AOD) for precise chemical composition control
• Vacuum Oxygen Decarburization (VOD) for ultra-low gas content (O₂, H₂, N₂)
• Electroslag Remelting (ESR) for important applications requiring maximum inclusion cleanliness and homogeneity

Forging Equipment

We use a range of advanced forging equipment to produce high-quality forgings with excellent grain matrix and mechanical properties:

• 2,000 T, 4,000 T and 6,300 T hydraulic forging presses
• 0.75 T to 9 T electro-hydraulic forging hammers
• 1 M and 5 M seamless ring rolling machines
• Computer-controlled forging processes with real-time monitoring for consistent quality

Comprehensive Quality Testing & Non-Destructive Inspection

Every X21CrMoV12-1 (1.4926) forged part is given a rigorous testing and inspection program, ensuring all of them meet specifications:

• Chemical composition analysis using optical emission spectrometry (OES)
• Tangential, axial and radial tensile strength tests
• Notched bar Charpy impact tests at room temperature and elevated temperatures
• 100% Ultrasonic Testing (UT) per ASTM A388 or EN 10228-3
• Magnetic Particle Testing (MT) per ASTM E709 / EN 10228-1
• Liquid Penetrant Testing (PT) per ASTM E165 / EN 10228-2
• Boroscope examination for hollow parts
• Hardness testing and microstructure analysis
• Magnetic induction measurement
• Residual stress measurement
• Precise dimensional inspection using CMM equipment
• Complete QA documentation verification

We welcome third-party inspection by reputable certification bodies including SGS, Bureau Veritas (BV), TÜV, Lloyd's Register, DNV, ABS and many others at our facility.

Frequently Asked Questions — X21CrMoV12-1 (1.4926) Forgings

Physical & Thermal Properties of X21CrMoV12-1 (1.4926)

A comprehensive understanding of the physical and thermal properties of 1.4926 steel across the complete operating temperature spectrum is critical for stress analysis, thermal fatigue evaluation, and long‑term component life prediction. The numbers below are what you would expect from Jiangsu Liangyi's well-processed, quenched, and tempered X21CrMoV12-1 forgings. Unlike published handbook averages, these figures reflect material with low inclusion content achieved through AOD/VOD refining and, where applicable, ESR re-melting.

Density & Melting Behaviour

Elastic Modulus vs. Temperature

The elastic modulus of X21CrMoV12-1 decreases significantly with rising temperature. This reduction must be factored into blade and rotor deflection calculations, particularly for components operating continuously above 550°C. The data below represents average values for forgings in the Q+T condition:

Mean Coefficient of Thermal Expansion

X21CrMoV12-1 exhibits a lower thermal expansion coefficient than austenitic stainless steels (which typically run 16–18 ×10⁻⁶ K⁻¹). This lower expansion is a key advantage in cycling service, as it reduces the magnitude of thermal stresses during start-up and shutdown — a primary cause of low-cycle fatigue damage in turbine rotors.

Thermal Conductivity & Specific Heat

High-Temperature Creep & Rupture Strength of X21CrMoV12-1 (1.4926)

Creep resistance — the ability to resist slow plastic deformation under sustained stress at elevated temperature — is the defining property of X21CrMoV12-1. In turbine rotor and blade applications, creep rupture life and minimum creep rate determine safe allowable stress levels for design and remaining-life assessment. The data below reflects typical performance of quenched and tempered X21CrMoV12-1 forgings with correct heat treatment.

Creep Rupture Strength (100,000-Hour Basis)

The following table shows the stress level at which X21CrMoV12-1 (1.4926) specimens fracture after 100,000 hours (approximately 11.4 years) of continuous loading at the specified temperature. These values are the engineering basis for design allowable stresses in power generation codes such as EN 13480, ASME Section I, and TRD 301.

Minimum Creep Rate

For design of components where total accumulated strain rather than fracture is the limiting criterion (e.g., turbine rotor bore distortion), the minimum creep rate (also called secondary creep rate) is the key parameter. The values below are at a constant applied stress of 100 MPa:

High-Temperature Short-Term Tensile Properties

Beyond standard room-temperature mechanical testing, procurement specifications for turbine components often require elevated temperature tensile testing. The following values are typical for X21CrMoV12-1 (1.4926) tested at temperature after standard Q+T heat treatment:

Heat Treatment Parameters for X21CrMoV12-1 (1.4926) Forgings

Correct heat treatment is the single most important factor determining the final mechanical properties, microstructure and long-term creep resistance of X21CrMoV12-1 forgings. At Jiangsu Liangyi, all heat treatment cycles are performed in computer-controlled, recirculating-atmosphere furnaces with calibrated thermocouples at multiple positions. Temperature uniformity within the load is verified to ±5°C before soaking commences.

Standard Quenching & Tempering (Q+T) Cycle

Optional Heat Treatment Cycles

Metallurgical Microstructure & Property Mechanism

The exceptional high-temperature strength of X21CrMoV12-1 (1.4926) originates from a combination of metallurgical strengthening mechanisms that are activated by the quench and temper process:

• Tempered martensitic matrix: The high chromium content (11–12.5%) suppresses the martensite start temperature to approximately 280–320°C, producing a fine-lath martensitic structure after quenching. This structure provides the base strength and is the template on which other strengthening mechanisms act.
• Carbide precipitation hardening: During tempering, Cr₂₃C₆ and M₂₃C₆ carbides precipitate on prior austenite grain boundaries and lath boundaries. These fine carbides pin dislocation movement, directly contributing to creep resistance. The vanadium content (0.25–0.35%) additionally promotes V(C,N) precipitation, which provides finer and more thermally stable particles than chromium carbides alone.
• Solid solution strengthening: Molybdenum (0.80–1.20%) is highly effective in solid-solution strengthening at elevated temperatures. Mo atoms in the iron lattice significantly retard dislocation climb and glide at temperatures above 500°C.
• Subgrain stabilisation: The combination of Cr, Mo and V precipitates at subgrain boundaries stabilises the martensitic lath structure against coarsening during long-term high-temperature service — maintaining strength over operating lifetimes of 100,000+ hours.

X21CrMoV12-1 vs. Similar Creep-Resistant Steel Grades — Which Should You Choose?

Selecting the right creep-resistant steel grade depends on your operating temperature, mechanical load, environment and applicable code. The four grades most commonly compared with X21CrMoV12-1 (1.4926) in turbine and pressure-vessel engineering are: X20CrMoV12-1 (1.4922), P91 / X10CrMoVNb9-1 (1.4903), F22 / 10CrMo9-10 (1.7380), and X19CrMoNbVN11-1 (1.4913). The comparison below is based on Jiangsu Liangyi's manufacturing experience with all four grades.

How to Choose Between X21CrMoV12-1 and Its Alternatives

Choose X21CrMoV12-1 (1.4926) when: your application requires service temperatures up to 650°C, high tensile strength at temperature (Rm >900 MPa at RT), excellent oxidation resistance in steam or combustion gas environments, and the forged component is a rotating or pressure-bearing part where creep deformation must be minimised over 100,000+ hour design life. It is the preferred grade for HP turbine rotors and valve spindles in conventional and combined-cycle power plants operating between 580°C and 650°C steam conditions.

Choose X20CrMoV12-1 (1.4922) when: your application requires slightly lower tensile strength (avoiding stress corrosion risk in some environments), or when weld-repairability is a higher priority and the peak operating temperature does not exceed 620°C. X20 and X21 are compositionally very close; the main practical difference is that X21 carries a slightly higher carbon content (0.20–0.26% vs 0.17–0.23%), giving marginally higher strength and creep resistance in exchange for slightly more demanding welding procedures.

Choose P91 (X10CrMoVNb9-1, 1.4903) when: the primary need is a lower-strength grade for pressure-containing components (pipe headers, collectors, pressure vessels) that does not require the high tensile strength of the 12% Cr grades. P91 is the dominant grade for steam piping in ultra-supercritical plant, where wall thickness can absorb its lower strength, but it is generally unsuitable for turbine rotor applications due to its lower tensile properties.

Supply Conditions & Delivery Specification for X21CrMoV12-1 (1.4926) Forgings

Every X21CrMoV12-1 (1.4926) forging shipped by Jiangsu Liangyi is delivered with a clearly defined set of supply conditions agreed at the time of order. Understanding these conditions avoids misalignment between order specification and delivered product. The following describes our standard and optional supply parameters.

Standard Delivery Condition

All commercial deliveries are made in the Quenched and Tempered (Q+T) condition unless otherwise specified. This means each forging has undergone the full Q+T cycle described in Section 4 above, and mechanical properties have been tested and certified before shipment. Annealed supply (soft condition for subsequent machining and re-heat-treatment by the customer) is available on request with a note that mechanical properties in the annealed condition will not conform to EN 10302 minimum values.

Surface Condition Options

Standard Test & Inspection Requirements

Documentation & Mill Test Certificate (MTC)

Every shipment of X21CrMoV12-1 forgings is accompanied by a complete Mill Test Certificate (MTC) as per EN 10204. The certificate type is agreed at the time of order:

• EN 10204 Type 2.2 — Test report based on non-specific inspection; issued by manufacturer (suitable for small commercial quantities where end-customer does not require witnessed testing)
• EN 10204 Type 3.1 — Inspection certificate issued and validated by Jiangsu Liangyi's own ISO 9001:2015-certified quality department; provided as standard for all forging orders at no additional cost
• EN 10204 Type 3.2 — Inspection certificate co-signed by an independent third-party inspector; available when the customer arranges and funds the third-party body (SGS, BV, TÜV, DNV, Lloyd's Register, ABS etc.); additional inspection fees apply and must be agreed before order placement

MTC content includes: heat number, chemical analysis, heat treatment record, all mechanical test results, UT/MT/PT results, hardness map, dimension report, and reference to the applicable material standard and customer order number.

Packaging, Export & Global Logistics for X21CrMoV12-1 Forgings

With over 25 years of export experience to 50+ countries, Jiangsu Liangyi has developed standardised yet flexible packaging and logistics procedures that protect X21CrMoV12-1 forgings from corrosion, mechanical damage and handling losses during international sea, air and land transport. All export documentation complies with the import requirements of the destination country.

Standard Packaging Specifications

Shipping & Trade Terms

Typical Transit Times to Major Destinations

Export Documentation Provided

Jiangsu Liangyi prepares and issues a complete set of export documents for each shipment of X21CrMoV12-1 forgings, ensuring smooth customs clearance in the destination country:

• Commercial Invoice — with full HS Code classification (typically HS 7326.19 or 7205.10 depending on form)
• Packing List — itemised by piece number, weight and dimensions
• Bill of Lading (B/L) — or Air Waybill for air shipments
• Certificate of Origin — China (CCPIT or General Administration of Customs)
• Mill Test Certificate (MTC) — EN 10204 3.1 or 3.2
• Phytosanitary Certificate — for wood packaging (ISPM 15 treatment certificate)
• Insurance Certificate — when shipped under CIF terms
• Third-party inspection report (SGS / BV / TÜV) — when required by customer

Why Choose Jiangsu Liangyi for X21CrMoV12-1 (1.4926) Forgings?

There are dozens of forging companies in China. What separates Jiangsu Liangyi from the competition is not just equipment — it is the integration of metallurgical expertise, process control discipline and a customer-facing quality culture that has been refined across 25+ years and 50+ export markets. The following summarises the specific advantages that matter to engineers specifying X21CrMoV12-1 (1.4926) forgings: