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Incoloy 800 Bolt Chinese Manufacturer
QS Fastener: Incoloy 800 Bolt Chinese Manufacturer
Name: Incoloy 800 Bolt Chinese Manufacturer
Material: Incoloy 800, UNS N08800
Length: 30 mm
Size: M20
Hardness: 170-220 HB
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Price: USD 5.5 - 9.5/ Kg
MOQ: 10 kg
Customization: yes
Delivery time: 7-30 Day
Material: Incoloy 800, UNS N08800
Length: 30 mm
Size: M20
Hardness: 170-220 HB
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Price: USD 5.5 - 9.5/ Kg
MOQ: 10 kg
Customization: yes
Delivery time: 7-30 Day
Quantity
The Incoloy 800 Hex Head Bolt (M20×30 mm, 170–220 HB) is a high-performance fastener engineered for heat exchangers and critical piping systems. Manufactured from nickel-iron-chromium alloy UNS N08800, this bolt delivers exceptional resistance to oxidation, carburization, and stress-corrosion cracking at sustained elevated temperatures. As a trusted Incoloy 800 Bolt Chinese Manufacturer, we combine cost-effective production with strict ASTM B408, ASME SB408, and AMS 5766 compliance, ensuring reliable service in power generation, chemical processing, and energy equipment. With customizable lengths, MOQ from 10 kg, and delivery within 7–30 days, our bolts suit both prototype and bulk orders.
1. Heat Treatment – Solution Annealing
Performed at 1100°C × 1 h followed by water quenching, this step fully dissolves M₂₃C₆ carbides and γ′ (Ni₃(Al,Ti)) precipitates, creating a homogeneous austenitic matrix. Rapid quenching suppresses secondary-phase formation, retaining a supersaturated solid solution that enables subsequent age hardening. This treatment guarantees uniform grain structure and eliminates residual stresses from prior cold work.
Performed at 1100°C × 1 h followed by water quenching, this step fully dissolves M₂₃C₆ carbides and γ′ (Ni₃(Al,Ti)) precipitates, creating a homogeneous austenitic matrix. Rapid quenching suppresses secondary-phase formation, retaining a supersaturated solid solution that enables subsequent age hardening. This treatment guarantees uniform grain structure and eliminates residual stresses from prior cold work.
2. Cold Forming – Multi-Station Heading & Thread Rolling
- Heading: Phosphated and soap-coated wire (3–5 g/m², μ ≤ 0.05) with cold-drawn bar hardness HRB 75–85 prevents cracking during upsetting.
- Thread Rolling: Using ASP2060 powder-metallurgy rolls (HRC 64–66) with 60° ± 15′ thread angle per ASME B1.1. Rolling at 25–35 rpm (1.2–1.7 m/min) induces compressive residual stress (−350 to −500 MPa by XRD), boosting fatigue life by >20%. Rolling force is calculated as F = 0.8 × σ₀.₂ × A (σ₀.₂ = 450 MPa). Pre-rolling hardness ≤ HRB 90 and 100% magnetic-particle inspection (ASTM E1444) eliminate root cracks; lead deviation <0.02 mm/25 mm (ISO 965-1 Grade 4h) is ensured via three-roller machines.
- Heading: Phosphated and soap-coated wire (3–5 g/m², μ ≤ 0.05) with cold-drawn bar hardness HRB 75–85 prevents cracking during upsetting.
- Thread Rolling: Using ASP2060 powder-metallurgy rolls (HRC 64–66) with 60° ± 15′ thread angle per ASME B1.1. Rolling at 25–35 rpm (1.2–1.7 m/min) induces compressive residual stress (−350 to −500 MPa by XRD), boosting fatigue life by >20%. Rolling force is calculated as F = 0.8 × σ₀.₂ × A (σ₀.₂ = 450 MPa). Pre-rolling hardness ≤ HRB 90 and 100% magnetic-particle inspection (ASTM E1444) eliminate root cracks; lead deviation <0.02 mm/25 mm (ISO 965-1 Grade 4h) is ensured via three-roller machines.
3. Age Hardening – γ′ Precipitation Control
Held at 720°C × 16 h, this step precipitates fine γ′ particles (Ni₃(Al,Ti)) of 10–30 nm size with number density ~1×10²²/m³, as verified by TEM. Strengthening contribution Δσ ≈ 300 MPa (calculated by M × G × b × √(N × d)), providing sustained hardness and creep resistance up to 800°C. Every batch from our Incoloy 800 Bolt Chinese Manufacturer facility is tested for hardness, microstructure, and dimensional accuracy, ensuring that each bolt meets the rigorous demands of high-temperature bolted joints.
Held at 720°C × 16 h, this step precipitates fine γ′ particles (Ni₃(Al,Ti)) of 10–30 nm size with number density ~1×10²²/m³, as verified by TEM. Strengthening contribution Δσ ≈ 300 MPa (calculated by M × G × b × √(N × d)), providing sustained hardness and creep resistance up to 800°C. Every batch from our Incoloy 800 Bolt Chinese Manufacturer facility is tested for hardness, microstructure, and dimensional accuracy, ensuring that each bolt meets the rigorous demands of high-temperature bolted joints.
FAQ
Q1: What is the maximum service temperature for this Incoloy 800 bolt?
A: Up to 800°C in oxidizing environments; short-term peaks to 850°C are acceptable.
Q1: What is the maximum service temperature for this Incoloy 800 bolt?
A: Up to 800°C in oxidizing environments; short-term peaks to 850°C are acceptable.
Q2: Can you supply bolts with custom lengths beyond 30 mm?
A: Yes, we offer full customization – length, diameter, and thread type per your drawings.
A: Yes, we offer full customization – length, diameter, and thread type per your drawings.
Q3: Is this bolt suitable for sour gas or chloride-rich media?
A: Yes, its high Ni-Cr content resists chloride SCC and polythionic acid stress corrosion.
A: Yes, its high Ni-Cr content resists chloride SCC and polythionic acid stress corrosion.
Q4: What certificates are provided with each shipment?
A: We supply mill test certificates, heat analysis, hardness reports, and NDE records per ASTM E1444.
A: We supply mill test certificates, heat analysis, hardness reports, and NDE records per ASTM E1444.
Q5: How is the 720°C aging time determined for different diameters?
A: 16 h is standard for M20; larger sizes may require +2 h per 10 mm increase to ensure uniform precipitation.
A: 16 h is standard for M20; larger sizes may require +2 h per 10 mm increase to ensure uniform precipitation.
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