Material system and typical grades

- Core alloy types:

- Hastelloy C series: such as C-276 (Ni-Cr-Mo-W), C-22 (optimized Cr-Mo ratio), are extremely resistant to oxidizing/reducing acid and chloride ion corrosion;

- Hastelloy B series: such as B-3 (Ni-Mo), focus on non-oxidizing acid corrosion such as hydrochloric acid and sulfuric acid;

- Hastelloy G series: such as G-35 (Ni-Cr-Mo-Cu), resistant to phosphoric acid, mixed acid and fluorine-containing media corrosion.

- Composition characteristics:

- C-276 contains 16% Mo + 5% W, and has outstanding pitting resistance in wet chlorine and hypochlorite environments;

- The Mo content of B-3 is 28%, and it is resistant to 70% hydrochloric acid corrosion at room temperature.

Performance advantages

1. Corrosion resistance

- Comprehensive corrosion resistance:

- Strong acid resistance: The corrosion rate in boiling 65% nitric acid and 50% sulfuric acid is less than 0.1mm/year;

- Chloride resistance: Stress corrosion cracking (SCC) resistance in seawater, salt spray and Cl⁻-containing media is better than ordinary stainless steel;

- Local corrosion resistance: Pitting potential> 1.2V (vs SCE), and it is not easy to form pits in F⁻ and Cl⁻-containing solutions.

2. Mechanical and high temperature properties

- Strength and toughness:

- Room temperature tensile strength ≥ 730MPa, elongation ≥ 40%, cold forming processing;

- Maintain oxidation resistance at high temperatures (500℃~1000℃), C-276 oxidation weight gain in 1200℃ air environment < 0.5mg/cm².

3. Processing and welding

- It can be welded by argon arc welding (TIG), plasma welding and other processes, without preheating before welding, and there is no risk of intergranular corrosion after welding;

- The hardness of cold-rolled plate is ≤220HB, which can be stamped and bent, and is suitable for complex structural parts.

Specifications and manufacturing process

1. Size range

- Thickness: 0.5mm~100mm (thin plate, medium and thick plate);

- Width: 1000mm~2500mm, length up to 6000mm;

- Surface state: cold-rolled annealing (2B), hot-rolled pickling (NO.1), mirror polishing (BA), roughness Ra≤1.6μm.

2. Production process

- Smelting: vacuum induction furnace (VIM) + electroslag remelting (ESR), control S, P impurities ≤ 0.01%;

- Rolling: hot rolling and solution treatment (quenching at 1150℃~1200℃), grain refinement and stress elimination;

- Inspection: ultrasonic flaw detection (UT), intergranular corrosion test (ASTM G28), hardness test (HB/HRB).

3. Implementation standards

- American standard: ASTM B575 (Hastelloy alloy plate), ASME SB-575;

- National standard: GB/T 21433 (corrosion-resistant alloy steel plate).

Application scenarios

1. Chemical and petrochemical

- Reactor lining (C-276 plate): Processing chemical raw materials containing hydrochloric acid and chlorine;

- Heat exchanger tube bundle support plate (B-3 plate): Anti-corrosion in sulfuric acid alkylation unit;

- Pipe flange (C-22 plate): Transport organic media containing chloride ions.

2. Energy and environmental protection

- Flue gas desulfurization (FGD) device baffle door: Resistant to wet SO₂+Cl⁻ corrosion;

- Nuclear waste treatment container (C-276 plate): Resistant to strong radiation and acidic media;

- Geothermal wellhead device: Resistant to geothermal fluids containing H₂S and CO₂ above 200°C.

3. Marine engineering

- Seawater desalination equipment (C-276 plate): Resistant to seawater scouring and chloride corrosion;

- Deep-sea pipeline coating: Prevent microbial corrosion (MIC) and electrochemical corrosion.

4. Pharmaceuticals and Food

- High-pressure reactor (C-22 plate): resistant to strong acid and alkali liquid corrosion, in line with FDA hygiene standards;

- Lining of food processing equipment: avoids metal ion contamination, easy to clean surface.