EN
Carburization Resistant Incoloy 800HT Round Rod Dia 25-220mm for Sintering Fixtures
Engineered with optimized (Al+Ti) chemistry and controlled coarse grain structure to deliver exceptional carburization resistance, internal oxidation defense, and long-term creep strength for extreme industrial sintering and heat-treating environments.
- Overview
- Specifications
- Key Features
- Applications
- Manufacturing & Quality
- FAQ
- Recommended Products
Carbon Saturation Resistance: The high nickel (30.0–35.0%) and chromium (19.0–23.0%) matrix creates an impenetrable chromium-rich barrier that resists hydrocarbon gas penetration and catastrophic metal dusting.
Enhanced Creep-Rupture Integrity: Strict control of carbon content (0.06–0.10%) combined with titanium and aluminum additions (0.85–1.20% total) ensures stable coarse grain microstructure, providing outstanding resistance to creep elongation and sagging under high-temperature loads exceeding 600°C (1110°F).
Thermal Fatigue Life Extension: Excellent thermal conductivity and balanced thermal expansion characteristics prevent fixture warping during rapid heating and cooling cycles.
Product Overview
In industrial powder metallurgy sintering, vacuum carburizing, and continuous mesh belt furnaces, structural fixtures continuously suffer from thermal shock, aggressive carbon-rich atmospheres, and severe mechanical loads. Standard stainless steels and conventional heat-resistant grades rapidly embrittle, distort, and fail due to severe carbide precipitation and internal oxidation.
DLX Carburization Resistant Incoloy 800HT Round Rod resolves these failure modes at the metallurgical level:
Technical Specifications
1. Certified Chemical Composition (Weight %)
All heats undergo full spectral analysis and vacuum degassing to ensure ultra-low gas content and zero tramp element contamination.
| Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Carbon (C) | Al + Ti | Manganese (Mn) | Silicon (Si) | Copper (Cu) |
|---|---|---|---|---|---|---|---|---|
| Standard Spec | 30.00 – 35.00 | 19.00 – 23.00 | Balance (≥39.5) | 0.06 – 0.10 | 0.85 – 1.20 | ≤ 1.50 | ≤ 1.00 | ≤ 0.75 |
| DLX Typical Heat | 32.40 | 20.80 | 44.50 | 0.08 | 1.02 | 0.75 | 0.40 | 0.15 |
2. Physical & Thermal Properties (Solution Annealed State)
| Parameter | Metric Value | Imperial / Operating Significance |
|---|---|---|
| Density | 7.94 g/cm³ | Optimized weight-to-strength ratio |
| Melting Range | 1357°C – 1385°C | High-temperature structural stability |
| Specific Heat Capacity | 460 J/(kg·°C) [at 20°C] | Uniform heat dissipation |
| Thermal Conductivity | 11.5 W/(m·K) [at 20°C] / 24.7 W/(m·K) [at 800°C] | Prevents localized thermal hotspots |
| Electrical Resistivity | ~0.99 μΩ·m [at 20°C] | High electrical stability |
| Continuous Service Temp | Up to 1100°C (2010°F) | Ideal for vacuum & atmosphere sintering |
3. Mechanical & Room/High-Temperature Properties
| Mechanical Property | Solution Annealed Baseline (20°C) | Elevated Temp Property (800°C) |
|---|---|---|
| Tensile Strength (Rm) | ≥ 500 MPa | ≥ 220 MPa |
| Yield Strength (Rp0.2) | ≥ 200 MPa | ≥ 120 MPa |
| Elongation (A5) | ≥ 35% | ≥ 45% (High ductility) |
| Hardness (Brinell) | 130 – 170 HBW | Retains hot hardness |
| Microstructure Grain Size | ASTM 5 or coarser (Strict optical microscopy) | Microstructural creep defense |
Key Features: Carburization Resistant Structural Advantages
1. Superior High-Temperature Carburization & Oxidation Immunity
Unlike standard stainless alloys that quickly carburize and embrittle in endothermic and hydrocarbon sintering gases, Incoloy 800HT generates a stable, regenerative Cr2O3 and Al2O3 protective film, preventing internal grain boundary carbon embrittlement and catastrophic surface spalling.
2. High Creep-Rupture Strength for Heavy-Load Fixture Life
Through advanced solution heat treatment at temperatures exceeding 1150°C, the alloy achieves a uniform, coarse-grained matrix. Combined with (Al+Ti) carbon-nitride precipitation hardening, the rods resist sagging, creep deformation, and elongation under continuous mechanical load above 600°C.
3. Precision Dimensional Tolerances & Surface Integrity
Supplied in centerless ground, peeled, or cold-drawn finishes with diameter tolerances strictly controlled to h9, h10, or h11 standards. The round rods feature straightness ≤ 0.5 mm/m and 100% full-length ultrasonic defectoscopy testing to eliminate internal voids, inclusions, and shrinkage cavities.
4. Excellent Weldability & Machining Workability
Incoloy 800HT round rods exhibit stable machinability and superior weld integrity. They can be readily fabricated, forged, and welded with matching superalloy consumables (such as ERNiCrCoMo-1 or Inconel 617/82 welding wire) without post-weld micro-cracking.
Key Applications
1. Powder Metallurgy Sintering Furnace Fixtures & Trays
- Sintering furnace grid bars, loading pins, fixture uprights, and support shafts
- High-temperature pusher furnace crossbeams and conveyor rollers
- Vacuum sintering jig systems for automotive and aerospace PM components
2. Atmosphere & Vacuum Carburizing Furnace Equipment
- Gas carburizing retorts, radiant heating tubes, and atmosphere circulation fan shafts
- Heat treatment basket support posts, hanging racks, and furnace hearth beams
- Quench tank fixture components subjected to severe thermal cycling
3. Petrochemical & High-Temperature Industrial Processing
- Ethylene pyrolysis cracking furnace pigtails and support hangers
- Ammonia synthesis converter internal structural rods
- Industrial burner nozzles, flare tips, and thermal sensor thermowells
Why Choose DLX Carburization Resistant Alloys
1. Advanced Smelting & In-House Refining Capacity
Changzhou DLX Alloy Co., Ltd. operates state-of-the-art dual-melting processes including Vacuum Induction Melting (VIM), Electro-Slag Remelting (ESR), and high-precision hydraulic radial forging. With a steady manufacturing capacity of 1,200 metric tons per month, we ensure prompt delivery of consistent high-integrity alloy batches.
2. Stringent Zero-Defect Metallurgical Quality Control
Every batch of round rods undergoes comprehensive in-house quality inspection:
- 100% Ultrasonic non-destructive flaw detection (EN/ISO Level 1 equivalent)
- Direct-reading optical emission spectrometry (OES) chemical verification
- Metallographic grain size measurement and high-temperature tensile/creep screening
- Full 3.1 Mill Test Certification traceable to molten heat numbers
3. Flexible Dynamic Supply & Custom Machining
- Diameter Range: 25mm to 220mm (Custom forged shafts available up to 350mm)
- Length: Standard 2000mm – 6000mm or cut-to-length as per client drawings
- Dynamic MOQ: Flexible MOQ starting from 50kg for trial prototypes up to multi-ton container shipments
- Finishes Available: Black forged, rough turned, bright peeled, and centerless ground
Product FAQ: Carburization Resistant Incoloy 800HT Round Rod
Q1: What makes Incoloy 800HT superior to 310S or 800H in carburizing atmospheres?
In carbon-rich sintering atmospheres, 310S quickly carburizes and embrittles. Incoloy 800HT features 30–35% nickel to block carbon ingress, plus controlled (Al+Ti) content and high-temperature solution annealing for up to 30% higher creep-rupture strength above 700°C.
Q2: Can DLX supply cut-to-length rods and precision centerless grinding?
Yes. We offer custom precision bandsaw cutting, centerless grinding down to h9 tolerance, surface peeling, chamfering, and customized forging to match your sintering fixture drawings.
Q3: How do you verify internal soundness in large-diameter rods (Dia 100–220mm)?
All large rods are refined via Electroslag Remelting (ESR) and radial forging, followed by 100% full-length ultrasonic testing (UT) to guarantee a dense, void-free core with zero internal defects.
Q4: What are your standard lead times and MOQ?
Standard sizes (Dia 25–100mm) ship in 7–15 days from rolling stock; custom-forged diameters (up to 220mm) take 20–30 days. We provide flexible, dynamic MOQs tailored to your specific trial or production needs.
