Chemical Area Application Nickel Alloy C276 Round Bar / Bright Shaft Diameter 6 - 300mm Custom Cutting in Length

1. Core Specifications (Parameters)

2. Key Performance Characteristics

2.1 Exceptional Corrosion Resistance

• Broad Chemical Tolerance: Resists most organic acids (e.g., acetic acid, formic acid), inorganic acids (e.g., sulfuric acid, hydrochloric acid up to 50% concentration), alkalis, and salt solutions (e.g., seawater, brines). It is one of the few alloys that withstands wet chlorine gas and chloride-rich media (a major cause of stress corrosion cracking in stainless steels).
• No Intergranular Corrosion: Low carbon content (≤0.01%) and controlled alloying prevent carbide precipitation during welding or heat treatment—eliminating intergranular corrosion risks in chemical reactors.

2.2 Mechanical & Thermal Stability

• Ductility & Toughness: Maintains high elongation (≥40%) even at cryogenic temperatures (-270°C), making it suitable for low-temperature chemical storage. At elevated temperatures (up to 1093°C), it retains sufficient strength for high-temperature processing equipment.
• Weldability: Compatible with common welding methods (TIG, MIG, SMAW) without pre-heating or post-weld heat treatment (PWHT), reducing production complexity for large chemical vessels.

2.3 Surface Performance (Bright Shaft Advantage)

• Minimizes crevice formation (where corrosion often initiates) on the bar’s surface.
• Ensures smooth material flow in fluid-handling components (e.g., valves, pumps), reducing friction and chemical buildup.

3. Manufacturing Process

1. Alloy Melting & Casting:
   • Raw materials (high-purity Ni, Cr, Mo, W) are melted in an electric arc furnace (EAF) or vacuum induction melting (VIM) to avoid impurity contamination.
   • Molten alloy is cast into cylindrical ingots (size matched to final bar diameter) to ensure uniform grain structure.
2. Hot Forging & Rolling:
   • Ingots are heated to 1150–1200°C and forged into rough round blanks, breaking down coarse grains and improving mechanical properties.
   • Blanks are then hot-rolled to the target diameter (6–300mm) via multi-pass rolling mills, ensuring dimensional accuracy.
3. Heat Treatment:
   • Annealing: Performed at 1120–1150°C for 30–60 minutes, followed by rapid water quenching. This step softens the material (reducing hardness to ≤210 HB) and eliminates internal stresses—critical for subsequent machining.
4. Precision Machining & Surface Finishing:
   • For bright shafts: Cold drawing (to refine diameter tolerance) followed by centerless grinding and polishing to achieve Ra ≤ 0.8μm surface roughness.
   • Custom Cutting: CNC saws or laser cutting machines are used to trim bars to customer-specified lengths (tolerance: ±0.5mm for lengths ≤1000mm), ensuring compatibility with assembly requirements.
5. Quality Inspection:
   • Chemical composition testing (via 光谱分析 /optical emission spectroscopy, OES).
   • Mechanical property testing (tensile, hardness, impact tests).
   • Dimensional inspection (using calipers, micrometers, or laser scanners).
   • Corrosion resistance verification (salt spray tests or immersion tests in simulated chemical environments).

4. Industry Standards

5. 相近牌号 (Equivalent Grades)

6. Application in Chemical & Related Industries

6.1 Core Chemical Industry Applications

• Chemical Reactors & Vessels: Used for internal shafts, agitator rods, and support structures in reactors handling sulfuric acid, hydrochloric acid, or chlorinated solvents.
• Fluid Handling Components: Machined into valves, pump shafts, and fittings for chemical transfer systems (resists erosion-corrosion from high-velocity fluids).
• Heat Exchangers: Employed as tube sheets or baffle bars in heat exchangers for acid recovery (withstands temperature cycles and acidic coolants).

6.2 Extended Industrial Uses

• Petrochemicals: Components for offshore oil platforms (seawater resistance) and refineries (handles crude oil derivatives and hydrogen sulfide).
• Pharmaceuticals: Sanitary bright shafts for mixing equipment (smooth surface prevents bacterial buildup and complies with FDA standards).
• Wastewater Treatment: Bars for aerator shafts and sludge pumps in industrial wastewater plants (resists corrosive effluents like heavy metal salts).