Monel 400 Bolts Supplier

Exceptional Resistance to Seawater and Brine Corrosion
Excellent Resistance to Acid Corrosion

Monel 400 Bolts: Superior Corrosion Resistant Fasteners for Marine & Chemical Environments

SSM provides Monel 400 bolts engineered for the most aggressive corrosive conditions, particularly in environments involving reduced acid, seawater, and chemical processing. These nickel-copper alloy fasteners deliver an exceptional combination of excellent strength, outstanding toughness, and unparalleled resistance to chloride stress corrosion cracking, hydrofluoric acid, and seawater corrosion, making them the preferred choice for critical marine, chemical processing, and offshore oil & gas applications.

SSM Monel 400 Bolts are manufactured in strict accordance with ASTM, ASME, and applicable international standards, with full material traceability and certification (including EN 10204 3.1) available. They are specifically engineered for use in seawater cooling systems, chemical reactors, hydrogen fluoride processing equipment, marine propulsion components, and other demanding applications where reliability in severe chemical and marine environments is paramount.

Technical Specifications

Параметр	Описание
Product Name	Monel 400 Bolts / Stud Bolts
Материал	Nickel-Copper Alloy UNS N04400
Тип продукта	Bolts, Stud Bolts, Threaded Rods, U-Bolts
Key Strengths	Excellent Strength & Toughness; Outstanding Corrosion Resistance in Seawater & Reducing Acids
Strengthening Method	Cold Worked / Strain Hardened (per ASTM standards; not precipitation hardenable)
Диапазон температур	Cryogenic to Approx. 540°C (1000°F) for continuous service
Коррозионная стойкость	Excellent resistance to: Seawater & brine, Hydrofluoric Acid, Sulfuric & Hydrochloric Acids, Chloride Stress Corrosion Cracking (SCC)
Применимые стандарты	ASTM / ASME (B164, F468), DIN, ISO, MIL Specs (customizable)
Диапазон размеров	Customized (M3 to M64 & equivalent inch series)
Отделка поверхности	Plain / Passivated (ASTM A967) / Anti-Galling Coatings (e.g., Xylan, PTFE) optional
Primary Applications	Marine & Offshore, Chemical Processing (HF acid systems), Oil & Gas (downhole/seawater), Power Plant FGD Systems
Certification	EN 10204 3.1 / 3.2, Mill Test Certificates, Full Traceability
Warranty	As per specific contract and application conditions
After-sales Service	Full technical documentation, corrosion resistance guidance, application consultation

Material Properties – Monel 400

Монель 400 — это solution-strengthened nickel-copper alloy (typically containing about 67% nickel and 23% copper). It is renowned for its unparalleled corrosion resistance in reducing media, particularly in seawater, hydrofluoric acid, and sulfuric acid environments, while also offering good mechanical properties, machinability, and weldability.

Chemical Composition (wt.%)

Элемент	Диапазон содержания	Primary Function
Никель (Ni)	≥ 63.0%	Base element, provides austenitic structure and corrosion resistance foundation, particularly against reducing acids.
Медь (Cu)	28.0 – 34.0%	Key alloying element, significantly enhances corrosion resistance in reducing acids (e.g., sulfuric acid, hydrofluoric acid) and seawater, and imparts certain strength to the alloy.
Железо (Fe)	≤ 2.5%	Controlled impurity element, acceptable in small amounts.
Марганец (Mn)	≤ 2.0%	Deoxidizer and impurity element, helps improve hot workability.
Углерод (С)	≤ 0,3%	Controlled impurity element, typically maintained at low levels.
Кремний (Si)	≤ 0,5%	Deoxidizer and impurity element.
Сера (S)	≤ 0,024%	Strictly controlled harmful impurity.

Mechanical Properties (Can be strengthened by cold working)

Механизм укрепления: Primarily strengthened through cold working (strain hardening); cannot be precipitation-hardened by heat treatment.

Typical Properties in Annealed (Soft) Condition:

Tensile Strength: 480 – 550 MPa
Yield Strength (0.2%): 170 – 240 MPa
Удлинение: ≥ 35%

Typical Properties in Cold Worked (Hard) Condition:

Tensile Strength: Up to 690 МПа or higher
Yield Strength (0.2%): Up to 550 MPa or higher
Удлинение: Decreases with increasing cold work but still maintains good toughness.

Эффективность при низких температурах:

Retains excellent toughness and strength at cryogenic temperatures (liquid helium, liquid hydrogen temperatures) with no ductile-to-brittle transition.

Monel 400 Bolts Applications

Морская инженерия: Marine pump shafts, propeller shafts, seawater valves, fasteners, heat exchanger tube sheets.
Chemical and Petrochemical: Hydrofluoric acid alkylation units, sulfuric acid recovery equipment, hydrochloric acid handling systems, reactors, agitators.
Нефть и газ: Offshore platform equipment, deep-sea oil production systems, well tubing, valve components.
Power Generation: Flue gas desulfurization system components, boiler feedwater heaters.
Specialty Manufacturing: Pulp and paper industry bleaching equipment, halogen handling equipment, gasoline and detergent production equipment.

Универсальный поставщик фланцев для всех ваших нужд

SSM has significant product advantages in manufacturing Monel 400 Bolts. Whether it’s quality or price, we will meet your needs.

Monel 400 Bolts standards and specifications

Monel 400 bolts (UNS N04400) are a benchmark corrosion-resistant fastener solution in marine, chemical processing, and oil & gas industries. The main standards and specifications commonly referenced by international buyers are organized below into “Material / Fasteners / Manufacturing / Testing / Coating” categories.

Категория	Standard / System	Description / Notes (For Monel 400 Bolts)
Material Standards	UNS N04400	Nickel-copper alloy grade (core identification standard).
	ASTM B164 / ASME SB-164	Standard specification for nickel-copper alloy rod, bar, and wire (primary material standard).
	ASTM B127	Specification for nickel-copper alloy plate, sheet, and strip.
Fastener Standards	ASTM F468 / ASME SF-468	Nonferrous bolts, hex cap screws, and studs for general use. This is the primary fastener specification for Monel 400 bolts and studs.
	ASTM F467 / ASME SF-467	Nonferrous nuts for general use (companion to F468).
	ASME B18.2.1 / B18.31.2	Hex bolts and stud bolts dimensional standards (applied based on material spec).
	MIL-F-46882 / MIL-DTL-46882	Military specification for nickel alloy bolts, screws, and studs (applicable for defense/marine projects).
European / International Standards	DIN 17740 / 17742	German standards for nickel and nickel alloy wrought products.
	ISO 9724 / ISO 9725	International standards for nickel and nickel alloy bars and wires.
	EN 10204 3.1 / 3.2	Material test certificate (often mandatory for European projects, providing full traceability).
Chemical & Metallurgical Properties	ASTM B164 / B127	Define required chemical composition ranges for UNS N04400.
	Термическая обработка	Typically supplied in Annealed or Cold Worked (Strain Hardened) condition. Not a precipitation-hardenable alloy. Specific temper (e.g., 1/4 Hard, 1/2 Hard, Full Hard) must be specified.
Inspection & Testing	ASTM E8 / E21	Tensile testing at room temperature (mandatory). Elevated temperature testing less common.
	ASTM E10 / E18	Brinell/Rockwell hardness testing.
	ASTM G48 / G28	Critical pitting temperature (CPT) or corrosion testing in specific media (e.g., ferric chloride, acidic solutions) for high-end applications.
	Grain Size (ASTM E112)	Typically specified for quality control, especially for forged or hot-worked products.
	PMI Testing (XRF / OES)	Positive Material Identification to verify Ni-Cu alloy chemistry is crucial.
Surface Treatment & Anti-Galling	Passivation	Per ASTM A967 (Nitric acid method), to remove free iron and improve surface corrosion resistance. Often specified for marine/chemical service.
	Anti-Galling Coatings	PTFE / Xylan / Molybdenum Disulfide (MoS₂) coatings. Highly recommended due to the galling tendency of nickel alloys, especially in seawater service.
Industry Standards / References	ASTM / ASME Specifications	The primary governing system for industrial and pressure vessel applications.
	ASME Boiler & Pressure Vessel Code, Section VIII	Specifies requirements for pressure vessel bolting in corrosive service.
	NACE MR0175 / ISO 15156	Material requirements for sulfide stress cracking (SSC) resistance. Monel 400 generally has good to excellent resistance in many sour service environments, but limits apply (e.g., temperature, H₂S partial pressure).
	API 6A / 17D / 20C	For oil & gas wellhead, Christmas tree, subsea, and corrosion-resistant alloy equipment specifications.
	NORSOK M-001 / M-630	Materials selection standard for the Norwegian offshore sector, referencing Monel 400 for specific seawater and chemical duties.

Примечание: For Monel 400 fasteners, procurement is typically governed by detailed technical purchase specifications that directly invoke ASTM/ASME standards (e.g., ASTM F468) with supplementary requirements for condition (temper), testing, and certification. Cold work condition (strength level), required corrosion tests, and mandatory anti-galling coatings are critical parameters that must be explicitly defined in the purchase order for marine and chemical service.

Дополнительные ресурсы:

https://en.wikipedia.org/wiki/Stainless_steel