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NF Z8NC32.21 Bolt and Nut
QS Fastener: NF Z8NC32.21 Bolt and Nut
Name: NF Z8NC32.21 Bolt and Nut
Material: NA15
Standard: NF, BSW, DIN, ANSI
Size: M6 to M100
Product Grade: A
Length: 30 to 3000 mm
Hardness: 170-220 HB
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Material: NA15
Standard: NF, BSW, DIN, ANSI
Size: M6 to M100
Product Grade: A
Length: 30 to 3000 mm
Hardness: 170-220 HB
Application: For Heat Exchangers and Piping Systems
Feature: High Temperature Corrosion Resistance
Quantity
NF Z8NC32.21 Bolt and Nut is manufactured from NA15 material and complies with NF, BSW, DIN, and ANSI international standards. It is available in sizes ranging from M6 to M100 and lengths from 30 mm to 3000 mm, with a hardness of 170-220 HB and a product grade of Class A. This product offers excellent high-temperature corrosion resistance and is specifically designed for heat exchangers and piping systems, ensuring reliability and durability in high-temperature environments. It is an ideal fastening solution for industrial equipment.
The oxidation resistance of NF Z8NC32.21 Bolt and Nut is one of its key features, enabling it to perform exceptionally well in high-temperature and oxidizing environments. This alloy forms a dense Cr₂O₃ (chromium oxide) layer at high temperatures, which is highly stable and protective. This oxide layer effectively prevents further oxygen diffusion and oxidation of the base material, significantly extending the material's service life.
Oxide Layer Formation Mechanism
The oxidation resistance of NF Z8NC32.21 Bolt and Nut is primarily attributed to its high chromium content (19-23 wt%) and appropriate amounts of nickel (30-35 wt%) and iron (balance). In high-temperature oxidizing environments, chromium reacts with oxygen to form a Cr₂O₃ oxide layer. The formation process is as follows:
The oxidation resistance of NF Z8NC32.21 Bolt and Nut is primarily attributed to its high chromium content (19-23 wt%) and appropriate amounts of nickel (30-35 wt%) and iron (balance). In high-temperature oxidizing environments, chromium reacts with oxygen to form a Cr₂O₃ oxide layer. The formation process is as follows:
1. Initial Oxidation Stage: At high temperatures, chromium on the alloy surface reacts with oxygen to form a Cr₂O₃ oxide layer.
[4Cr + 3O_2
ightarrow 2Cr_2O_3]
[4Cr + 3O_2
ightarrow 2Cr_2O_3]
2. Oxide Layer Growth Stage: Over time, the Cr₂O₃ oxide layer gradually thickens, forming a dense protective layer.
3. Stabilization Stage: Once the oxide layer reaches a certain thickness, its growth rate significantly decreases, entering a stable state that effectively prevents further oxygen diffusion.
Characteristics of the Oxide Layer
The Cr₂O₃ oxide layer exhibits the following characteristics, making it an excellent oxidation barrier:
- Density: The Cr₂O₃ oxide layer has a dense structure, effectively blocking oxygen diffusion.
- Stability: At high temperatures, the Cr₂O₃ oxide layer exhibits exceptional thermal and chemical stability.
- Self-Healing Property: When the oxide layer is mechanically damaged, chromium rapidly reacts with oxygen to regenerate the oxide layer, restoring its protective function.
The Cr₂O₃ oxide layer exhibits the following characteristics, making it an excellent oxidation barrier:
- Density: The Cr₂O₃ oxide layer has a dense structure, effectively blocking oxygen diffusion.
- Stability: At high temperatures, the Cr₂O₃ oxide layer exhibits exceptional thermal and chemical stability.
- Self-Healing Property: When the oxide layer is mechanically damaged, chromium rapidly reacts with oxygen to regenerate the oxide layer, restoring its protective function.
Oxidation Resistance Data
The oxidation resistance of NF Z8NC32.21 Bolt and Nut at different temperatures is characterized by the oxidation rate (mm/year). A lower oxidation rate indicates better oxidation resistance. Below are typical oxidation rate data for NF Z8NC32.21 Bolt and Nut at high temperatures:
The oxidation resistance of NF Z8NC32.21 Bolt and Nut at different temperatures is characterized by the oxidation rate (mm/year). A lower oxidation rate indicates better oxidation resistance. Below are typical oxidation rate data for NF Z8NC32.21 Bolt and Nut at high temperatures:
| Temperature (°C) | Oxidation Rate (mm/year) | Oxide Layer Thickness (μm) | Remarks |
| 600 | <0.01 | 1-2 | Extremely thin oxide layer, excellent protection |
| 800 | <0.05 | 5-10 | Stable oxide layer, good protection |
| 1000 | <0.1 | 10-20 | Thicker oxide layer, still protective |
Factors Affecting Oxidation Resistance
The oxidation resistance of NF Z8NC32.21 Bolt and Nut is influenced by the following factors:
1. Temperature: Higher temperatures accelerate the oxidation rate, but NF Z8NC32.21 Bolt and Nut maintains excellent oxidation resistance up to 1000°C.
The oxidation resistance of NF Z8NC32.21 Bolt and Nut is influenced by the following factors:
1. Temperature: Higher temperatures accelerate the oxidation rate, but NF Z8NC32.21 Bolt and Nut maintains excellent oxidation resistance up to 1000°C.
2. Time: Over time, the oxide layer thickens, but its growth rate significantly decreases, reaching a stable state.
3. Environmental Atmosphere: In oxidizing atmospheres (e.g., air, oxygen), NF Z8NC32.21 Bolt and Nut exhibits optimal oxidation resistance; in reducing atmospheres (e.g., hydrogen) or sulfur-containing atmospheres, oxidation resistance may decrease.
4. Surface Condition: A smoother surface promotes more uniform oxide layer formation, enhancing oxidation resistance.
NF Z8NC32.21 Bolt and Nut, with its high chromium content and excellent Cr₂O₃ oxide layer formation capability, demonstrates outstanding oxidation resistance in high-temperature oxidizing environments. Its low oxidation rate, stable oxide layer, and self-healing properties make it an ideal material for industries such as chemical, power, nuclear, and aerospace. Through optimized surface treatment and alloy composition, the oxidation resistance of NF Z8NC32.21 Bolt and Nut can be further enhanced to meet more demanding high-temperature oxidation requirements.
NF Z8NC32.21 Bolt and Nut is specifically designed for heat exchangers and piping systems, ensuring reliability and durability in high-temperature environments. It is an ideal fastening solution for industrial equipment. Whether in chemical plants, nuclear facilities, or oil and gas pipelines, NF Z8NC32.21 Bolt and Nut provides reliable fastening performance, making it the ideal choice for high-temperature and high-pressure environments.
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