1. Basic Information
▶Common Names: Nickel 400, Monel 400, Nickel-Copper Alloy 400
▶Standard Grades: UNS N04400, W.Nr 2.4360, GB/T NS3301, ASTM B165/B730/B725
▶Microstructure Type: Single-phase austenitic solid solution alloy, non-magnetic or weakly magnetic
▶Core Composition: Ni ≥ 63%, Cu 28-34%, Fe ≤ 2.5%, Mn ≤ 2.0%, Si ≤ 0.5%, C ≤ 0.3%
2. Core Performance (Applicable Characteristics for Low-Pressure Pipelines)
2.1 Excellent Corrosion Resistance (Core Advantage for Low-Pressure Working Conditions)
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Corrosion Environment
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Corrosion Resistance Performance
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Corrosion Rate
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Seawater/Salt Water
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Excellent, with resistance to scour corrosion; a dense passive film forms rapidly on the surface
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< 0.025 mm/a
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Non-oxidizing acids (HCl, HF, dilute H₂SO₄ under degassed conditions)
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Superior, outperforming pure nickel and pure copper
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Extremely low
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Alkaline solutions
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Almost fully corrosion-resistant, including caustic soda and ammonia solutions
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Negligible
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Neutral salt solutions
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Highly stable, with no risk of pitting or crevice corrosion
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Extremely low
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Chloride environments
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Almost immune to chloride-induced stress corrosion cracking (SCC)
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No SCC tendency
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Notes
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Not suitable for strong oxidizing acids (e.g., concentrated nitric acid) and high-oxygen acidic environments
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-
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2.2 Mechanical and Physical Properties (Compatibility for Low-Pressure Pipelines)
▶Tensile Strength: 483-655 MPa (annealed state); cold working can increase it to over 1034 MPa
▶Yield Strength: 172-276 MPa (annealed state)
▶Elongation: ≥ 40% (annealed state), ensuring flexibility during pipeline installation
▶Hardness: HB ≤ 150 (annealed state)
▶Melting Point: Approximately 1300°C, suitable for welding processing
▶Thermal Conductivity: Good, facilitating heat transfer of low-pressure fluids
▶Temperature Range: -200°C ~ 427°C (long-term use); short-term use up to 538°C (in sulfur-free oxidation environments)
3. Application Scenarios for Low-Pressure Corrosion-Resistant Pipelines
1.Marine Engineering: Low-pressure conveying pipelines in seawater desalination plants, fire-fighting systems on offshore platforms, ballast water pipelines for ships, and cooling water lines in port facilities
2.Chemical Industry: Low-pressure raw material transportation for hydrochloric acid/hydrofluoric acid production, circulation systems for alkaline solutions, auxiliary pipelines for chlorine treatment, and catalyst conveying lines
3.Oil and Gas Industry: Low-pressure water injection pipelines on offshore platforms, sulfur-containing wastewater discharge lines in oil and gas processing plants, and low-pressure hydraulic pipelines for wellhead control equipment
4.Power Industry: Low-pressure auxiliary system pipelines in nuclear power plants, seawater cooling systems in thermal power plants, and condensed water recovery pipelines
5.Food and Pharmaceuticals: Pipelines for transporting alkaline cleaning solutions, low-pressure lines for chlorine-containing disinfectant water, and high-purity medium transmission systems
4. Standards and Specifications (Convenient for Procurement and Design)
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Standard Number
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Applicable Products
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Key Requirements
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ASTM B165
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Seamless and welded Nickel 400 pipelines
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Chemical composition, mechanical properties, non-destructive testing
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ASTM B730
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Seamless Nickel 400 heat exchange tubes (universal for low-pressure working conditions)
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Wall thickness tolerance, surface quality, hydrostatic test
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ASTM B725
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Nickel 400 pipeline fittings
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Dimensional accuracy, welding joint quality
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ASME SB165/SB730
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Nickel 400 pipelines for pressure vessels
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Higher quality control requirements
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EN 10216-5
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European standard seamless Nickel 400 pipelines
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Compliance with W.Nr 2.4360 requirements
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Common Specifications for Low-Pressure Pipelines:
▶Pipe Diameter: DN15 ~ DN600 (1/2" ~ 24")
▶Wall Thickness: SCH10 ~ SCH40 (SCH10/20 recommended for low-pressure working conditions)
▶Connection Methods: Welding (recommended to maintain corrosion resistance), flange connection (convenient for low pressure), thread connection (small caliber, low pressure)
DINGSCO Complete Production Chain:
SMELTING → FORGING → HEAT TREATMENT → MACHINING → HOT EXTRUSION
①Foundational Assurance in Smelting and Forging:
VIM furnaces ensure alloy purity; ESR furnaces further optimize internal structure. Forging yields diverse billets, laying a defect-free foundation for downstream processing and controlling material properties at the source.
②Precision Control in Intermediate Processing:
Heat treatment is customized for alloys. CNC machining enables high-precision forming, yielding semi-finished parts to ensure pre-extrusion billets meet forming specs.
③Synergistic Value of Hot Extrusion with Full Process:
The new hot extrusion press is part of an integrated system: High-purity alloys (VIM/ESR), dense forging microstructures, and heat-treated performance collectively enable stable extrusion of hard-to-form alloys. Produced complex components: seamless pipes, profiles; material utilization up 15-20%. Full-process efficiency cuts standard model lead times to 5-10 days.
④Quality and Delivery Assurance:
Every batch comes with EN 10204 Type 3.1 certification, inspected by our internal QC team. We support third-party audits (BV, SGS, etc.), and offer custom manufacturing per drawings with sample testing available.
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