3Cr24Ni7SiNRe heat resistant steel delivers superior high-temperature performance and long service life for extreme thermal industrial environments.
This alloy is designed to maintain stable performance under high temperatures and in harsh environments, providing the following benefits:
The Chemical Composition of 3Cr24Ni7SiNRe Grade Stainless Steel Pipes are as given below:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.32 ~ 0.42 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | 1.45 ~ 2.0 |
| Chromium (Cr) | 24 ~ 26 |
| Nickel (Ni) | 7.2 ~ 8.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.03 |
| Nitrogen (N) | 0.20 ~ 0.28 |
| Molybdenum (Mo) | 0.3 ~ 0.7 |
| Cerium (Ce) | 0.2 ~ 0.3 |
During manufacture, the 3Cr24Ni7SiNRE alloy undergoes a complex heat treatment process to ensure optimum performance. Firstly, the alloy undergoes a solid solution treatment at elevated temperatures to promote uniform element distribution and microstructure formation. Next, the alloy undergoes an ageing process to further optimise its microstructure and mechanical properties. The treatment steps ensure the stability and reliability of the alloy at high temperatures.
The 3Cr24Ni7SiNRE alloy has a wide range of applications in the aerospace, energy, chemical and automotive sectors. In aerospace, 3Cr24Ni7SiNRE is used in the manufacture of key components in high performance gas turbine engines, such as the combustion chamber source and collar nozzle, and in the manufacture of high temperature combustors and boiler components. In the chemical industry, the alloy is used in the manufacture of high-temperature reactors and catalytic converters in steam-carrying vehicles. In the chemical industry, 3Cr24Ni7SiNRE alloy is used in the manufacture of exhaust systems and turbocharger components.
3Cr24Ni7SiNRe is a specialized nickel-chromium-silicon nitrogen heat-resistant alloy steel, engineered to withstand extreme high-temperature environments while maintaining excellent mechanical properties and structural stability. This alloy integrates chromium, nickel, silicon, nitrogen and rare earth elements to form a protective oxide film at high temperatures, effectively preventing oxidation, peeling and creep deformation.
Unlike ordinary heat-resistant steels, 3Cr24Ni7SiNRe adopts a precision alloying ratio design, which not only enhances high-temperature strength but also improves thermal fatigue resistance. It is a core material for manufacturing key components in industrial heating furnaces, heat treatment fixtures, boiler parts and high-temperature conveying pipelines, and has become the preferred choice for high-temperature equipment in metallurgy, building materials, chemical industry and other industries.
3Cr24Ni7SiNRe stands out among heat-resistant alloys due to its comprehensive performance advantages, which are tailored to meet the harsh operating requirements of long-term high-temperature service:
The chemical composition of 3Cr24Ni7SiNRe is strictly controlled to ensure its high-temperature performance. The addition of rare earth elements optimizes the oxide film structure and further improves the service life of the material.
| Element | C | Cr | Ni | Si | N | Re | Mn | P/S |
|---|---|---|---|---|---|---|---|---|
| Content (%) | 0.28-0.35 | 23.0-25.0 | 6.0-8.0 | 1.0-2.0 | 0.20-0.28 | 0.05-0.12 | ≤1.0 | ≤0.04 |
3Cr24Ni7SiNRe has excellent mechanical properties at room temperature, and its strength and plasticity remain stable at high temperatures, which is the core guarantee for its reliable operation in high-temperature equipment.
| Temperature | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| Room Temperature | ≥650 | ≥380 | ≥12 | 180-240 |
| 800°C | ≥420 | ≥260 | ≥18 | - |
| 1000°C | ≥210 | ≥130 | ≥25 | - |
The heat resistance of 3Cr24Ni7SiNRe is the core indicator of its application value. It can maintain stable performance in long-term high-temperature environments and resist oxidation, creep and thermal corrosion.
At 1050-1100°C, the oxidation rate of 3Cr24Ni7SiNRe is less than 0.05g/(m²·h), which belongs to the level of complete oxidation resistance. The creep rupture life at 900°C/30MPa exceeds 1000 hours, which is far better than ordinary heat-resistant cast steels. The rare earth elements in the alloy can refine grains, purify grain boundaries, and improve the bonding force of the oxide film, so that the material will not crack and peel due to thermal stress during repeated heating and cooling.
We adopt precision smelting and casting processes to produce 3Cr24Ni7SiNRe steel products, strictly controlling each process to ensure the stability of material performance:
We can provide 3Cr24Ni7SiNRe materials and finished components in various forms to meet the customized needs of different industrial equipment:
| Product Type | Specification Range | Application |
|---|---|---|
| Castings | Customized size | Furnace bottom plate, fixture, heat treatment tray |
| Steel Pipe | Φ20-Φ600mm | High temperature pipeline, flue gas pipeline |
| Plate/Sheet | 3-100mm thickness | Furnace wall panel, heat shield |
| Forged Parts | Customized | High temperature shaft, flange |
With its excellent high-temperature performance, 3Cr24Ni7SiNRe is widely used in key fields that require long-term operation in high-temperature environments, covering almost all industrial sectors related to heating and heat treatment:
3Cr24Ni7SiNRe has been successfully applied in thousands of industrial equipment projects, and its service life is 2-3 times that of ordinary heat-resistant steels, which greatly reduces the equipment maintenance cost for customers:
In the continuous heat treatment furnace of a steel mill, the 3Cr24Ni7SiNRe material fixture has been used for more than 3 years without obvious deformation and oxidation; in the cement rotary kiln of a building materials company, the kiln tail accessories made of this alloy have a service life increased by 150% compared with the original material; in the high-temperature pipeline of a chemical plant, the 3Cr24Ni7SiNRe steel pipe has no corrosion and leakage after 2 years of operation.
These practical application cases fully prove the reliability and economy of 3Cr24Ni7SiNRe in high-temperature environments, making it the first choice for upgrading and transforming high-temperature equipment.
Compared with traditional heat-resistant steels such as 1Cr25Ni20 and 3Cr18Mn12Si2N, 3Cr24Ni7SiNRe has obvious advantages in high-temperature oxidation resistance and creep strength, and has a higher cost performance ratio:
| Performance Index | 3Cr24Ni7SiNRe | 1Cr25Ni20 | 3Cr18Mn12Si2N |
|---|---|---|---|
| Max Service Temp | 1100°C | 1050°C | 950°C |
| Oxidation Resistance | Excellent | Good | Medium |
| Creep Strength | Excellent | Good | Medium |
| Cost Performance | High | Medium | Low |
3Cr24Ni7SiNRe has good machinability and weldability, and can be processed by conventional cutting, drilling, milling and other processes. The following points should be noted during processing and welding:
For machining, use high-hardness carbide tools, select appropriate cutting speed and feed rate, and avoid excessive cutting temperature. For welding, it is recommended to use matching nickel-chromium welding wire, preheat to 200-300°C before welding, and cool slowly after welding to avoid welding cracks. After welding, solution heat treatment can be carried out if necessary to restore the high-temperature performance of the welded joint.
All our 3Cr24Ni7SiNRe products implement strict quality control standards, in line with national and industrial high-temperature alloy steel specifications. Each batch of products undergoes complete inspection before leaving the factory:
We provide professional packaging for 3Cr24Ni7SiNRe products to ensure that the products are not damaged or rusted during transportation. Small parts are packed in wooden boxes with moisture-proof paper, and large castings and steel pipes are bundled with steel belts and equipped with moisture-proof and shock-proof measures.
We support sea, land and air transportation, and can provide customized packaging and transportation solutions according to customer needs and delivery locations. At the same time, we provide complete product certificates and inspection reports to facilitate customer acceptance and use.
We provide personalized customization services for 3Cr24Ni7SiNRe products according to customer drawings, performance requirements and application scenarios. Whether it is special specification steel pipes, complex shape castings or customized performance alloys, we can meet your needs through professional R&D and production processes.
Our technical team will communicate with you in detail to determine the material plan, processing technology and delivery cycle, and provide one-stop solutions from material selection to finished product processing, helping you solve the material selection and application problems in high-temperature equipment manufacturing.
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