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High-Temperature Alloy 22Cr12NiWMoV for Sale - China Suppliers & Factory of Martensitic Steel
Description
22Cr12NiWMoV is a typical martensitic precipitation-hardening stainless steel, also classified as a high-temperature alloy. By incorporating various strengthening elements (such as W, Mo, V, and Nb) into a low-carbon martensitic matrix and undergoing appropriate heat treatment, it achieves excellent high strength, good toughness, fatigue resistance, and a certain degree of corrosion and oxidation resistance at high temperatures (typically below 600°C).
DZ 2.11.31-2021, an industry standard issued by the Aviation Industry Corporation of China (AVIC), is known as the "Specification for Hot-Rolled and Forged Bars for Aeroengines." This standard strictly stipulates the technical requirements for alloy bars used in the manufacture of key hot-end components of aircraft engines (such as turbine disks, compressor disks, blades, and shafts), covering chemical composition, mechanical properties, microstructure, and ultrasonic testing.
The 22Cr12NiWMoV material based on the DZ 2.11.31-2021 standard represents that its quality fully meets the stringent requirements of the aviation engine field for high performance, high reliability and high consistency.
Core Features and Applications
Key Features:
Typical applications (in aircraft engines):
It is also widely used in other high-end equipment manufacturing fields such as gas turbines and nuclear energy equipment.
Key Technical Requirements of DZ 2.11.31-2021 Standard
This standard sets comprehensive requirements for 22Cr12NiWMoV bars to ensure their aviation-grade quality.
1) Chemical composition (melting analysis)
| Element | Specified Range (wt %) | Effect |
|---|---|---|
| C | 0.20 ~ 0.25 | Ensure the strength of the martensite matrix and form carbides |
| Cr | 11.0 ~ 13.0 | Provides resistance to oxidation and corrosion |
| Ni | 0.50 ~ 1.00 | Stabilize austenite, improve toughness and hardenability |
| W | 1.50 ~ 2.00 | Solid solution strengthening, improving thermal strength and recrystallization temperature |
| Mo | 0.90 ~ 1.25 | Solid solution strengthening, suppressing temper brittleness and improving strength |
| V | 0.20 ~ 0.40 | Forming fine VC, V4C3 carbides, precipitation strengthening |
| Nb | 0.20 ~ 0.40 | Form stable NbC, refine grains, and improve strength and plasticity |
| S, P | ≤ 0.015 | Strictly control harmful elements and improve purity |
The standard has extremely strict control over the content range of alloying elements to ensure the stability and reproducibility of material properties.
2) Mechanical properties
The standard stipulates that the room temperature and high temperature mechanical properties of bars after a specific heat treatment system (usually quenching + tempering) must meet the following indicators (taking a common specification as an example, the specific values vary depending on the specification and heat treatment status):
| Performance Indicators | Numerical Range | Test Conditions |
|---|---|---|
| Tensile strength (Rm) | ≥ 930 MPa | Room temperature |
| Specified non-proportional elongation strength (Rp0.2) | ≥ 780 MPa | Room temperature |
| Elongation after break (A) | ≥ 15% | Room temperature |
| Sectional reduction (Z) | ≥ 55% | Room temperature |
| Impact energy (KU₂) | ≥ 63 J | Room temperature |
High temperature durability (e.g. at 550°C/530MPa): Durable life: ≥ 100 hours (specific test conditions and requirements will be specified in the standard).
3) Metallurgical quality and non-destructive testing
This is the core that distinguishes aviation standards from ordinary industrial standards, and the requirements are extremely high.
Heat Treatment System
DZ standards usually recommend or specify heat treatment systems to ensure that the material achieves the expected performance. The typical aviation heat treatment system for 22Cr12NiWMoV is:
Summary
22Cr12NiWMoV is a technologically mature, high-performance martensitic heat-resistant steel. When produced and controlled according to the DZ 2.11.31-2021 standard, its material properties, metallurgical quality, and consistency reach top-tier levels for aircraft engine applications. This standard, encompassing precise control of chemical composition, rigid mechanical performance specifications, and strict internal microstructure purity requirements, forms a crucial material foundation for ensuring safe, reliable, and long-life aircraft engine operation.
For engineers who choose this material, specifying compliance with the DZ 2.11.31-2021 standard means obtaining highly reliable material performance assurance in high-temperature and high-stress environments.
Frequently Asked Questions (FAQ)
It is a typical martensitic precipitation-hardening stainless steel and high-temperature alloy. It incorporates W, Mo, V, and Nb into a low-carbon martensitic matrix to achieve high strength, fatigue resistance, and corrosion resistance at high temperatures below 600°C.
Issued by the Aviation Industry Corporation of China (AVIC), this standard specifies the technical requirements (chemical composition, mechanical properties, microstructure, etc.) for hot-rolled and forged alloy bars used in critical hot-end aircraft engine parts.
It is primarily used to manufacture turbine rotor blades (medium and low-pressure stages), compressor rotor blades and disks operating at high temperatures, as well as high-temperature ring parts and fasteners.
At room temperature, the material must meet a tensile strength (Rm) of ≥ 930 MPa, non-proportional elongation strength (Rp0.2) of ≥ 780 MPa, and have a high-temperature durability life of ≥ 100 hours at 550°C/530MPa.
It enforces strict non-destructive testing, requiring 100% ultrasonic flaw detection to ensure no internal defects, strict limits on non-metallic inclusions (≤ level 1.5), and grain sizes not less than level 4.
It involves quenching (austenitizing) at 1020°C ~ 1050°C with oil or air cooling, followed by double tempering at 560°C ~ 580°C or higher to optimize the balance of strength and toughness.