One Stop Service

Full-process services from raw material selection, production and processing, quality control, export document preparation, logistics and transportation arrangements to customs clearance assistance.
Certification

ISO 9001:2008 Certified company, with a vision to manufacture, Supplier & Exporter of best Quality Assured Industrial Metals to the industry.
High Quality

Strict production and testing process, CE, EN Certificate, PMI, Size, PV, UV, test, SGS or BV third-party testing.
Customization

Our core capability is designing and manufacturing piping projects. JN uses expertise in Pipe Fabrication, Alloy Material, and Industry Standards to provide your solutions.

JINIE Technology

Supply Steel And Nickel Alloy Products

Stainless Steel

JN is a Duplex and Super Duplex Steel factory, exporter, supplier and distributor, we supply 2205 and 2507 grade material, products cover Sheet, Pipe Fitttings, Bars, Rods, Pipes, and Flanges.
Duplex Steel

JN is a Duplex and Super Duplex Steel factory, exporter, supplier and distributor, we supply 2205 and 2507 grade material, products cover Sheet, Pipe Fitttings, Bars, Rods, Pipes, and Flanges.
Nickel Alloy

JN is a supplier and exporter of nickel-based alloys such as Hastelloy, Monel, Inconel, Incoloy, etc. Alloys are available in 200, 201, C276, 600, 601, 625, 800, 800H, 800HT, 400, K500 grades, etc. We use nickel alloys to produce Plate, Sheet, Strip, Bar, Pipe, Tubing, Pipe Fittings, and Flanges.

Stainless Steel

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Duplex Steel

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Nickel Alloy

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Stainless Steel

Stainless Steel 316

Material: AISI 316, UNS S31600, 1.4401/1.4436

316 stainless steel is created by adding molybdenum and nickel to 304 stainless steel, and belongs to the austenitic stainless steel series. 316 steel has a high temperature resistance of 1200-1300 degrees due to the addition of M0 element. Due to its excellent performance, 316 stainless steel pipes are widely used in medical device manufacturing, pharmaceutical and food industries, chemical industries and other fields.

Duplex & Super Duplex

Super Duplex S32760 / F55

Material: Grade S32760, DIN 1.4501, F55

Duplex steels S32760 and F55 are resistant to various inorganic and organic acids. The added copper element makes them resistant to non-oxidizing acid corrosion. S32760 is also resistant to strong alkali corrosion. However, duplex steels S32760, F55, and 1.4501 are not suitable for use at long-term working temperatures above 300°C, because above this temperature, the toughness of the material will drop significantly.

Stainless Steel

Stainless Steel 904L

Material: AISI904L, N08904, 1.4539

904L is a low carbon austenitic stainless steel designed for use in severe corrosive conditions. Compared to 316L, 904L stainless steel has more chromium, nickel, molybdenum, and copper. Therefore, 904L steel is more wear-resistant and heavier, but there is not much difference in hardness. 904L stainless steel is also called "rolex 904l", which means that Rolex uses 904L to make watch cases.

Stainless Steel

Stainless Steel 254SMO/F44

Material: Grade S31254, 1.4547, F44

254SMO (UNS S31254 / EN 1.4547 / F44) is a 6% molybdenum super-austenitic stainless steel engineered for the most aggressive chloride environments. With a Pitting Resistance Equivalent Number of approximately 42–44 — nearly double that of 316L — and a critical pitting temperature of ≥ 50°C per ASTM G48, it is a standard material for seawater reverse osmosis.

Inconel Steel

Inconel 625

Material: Inconel 625, UNS N06625, 2.4856

Inconel 625 is a nickel-chromium high-temperature alloy known for its corrosion resistance, high-temperature strength, oxidation resistance, and ease of fabrication. It was originally created for high-temperature steam pipings, but due to its excellent comprehensive properties, it is now widely used in extremely harsh corrosive and high-temperature environments.

Hastelloy Steel

Hastelloy C276

Material: Hastelloy C276, UNS N10276, 2.4819

Hastelloy C276 is as nickel the main component, and molybdenum, chromium, and a small amount of iron, tungsten, etc. It exhibits excellent comprehensive performance in strong corrosive environments, so it is called the "king of corrosion-resistant alloys". Hastelloy C276 is known for its excellent mechanical properties, including high strength, toughness and ductility. In addition, the alloy can withstand high temperatures and high pressures, making it suitable for environments in the oil and gas, chemical and petrochemical industries.

About Us

JN Alloy is the leading manufacturers,suppliers and exporter of Fittings, Flanges, Forgings, Fasteners, Pipe, Tubes, Plates/sheets, Bars/rods, etc. We have Stainless Steel, Duplex Steel, and Nickel Alloy with various material grades. We maintain good cooperative relations with many manufacturers in the steel field, providing you with any type of metal products, thus saving you time and procurement costs.
All products of our company are supplied in accordance with American ASTM/ASME, German DIN, England BS, Japanese JIS, Russia GOST and Chinese steel standards, etc. In addition, JN can customize products according to customer's standards and technical requirements, including plates, strips, tubes, rods, forgings, fittings, flanges, welding materials, etc.

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8,800

20+

Years experience

We have a dedicated sales line so you can speak to someone who has the knowledge and expertise to make sure your order is perfectly correct.

Chosen By 200 Partners Worldwide

All products of our company are according to customer-provided standards and technical requirements. with American ASTM/ASME, German DIN, English ED, Japanese JIS, and other standards, synchronized with Chinese steel standards.

Products For Different Application Areas

Oil and Gas
Oil and Gas as a major source of global energy, the selection of corrosion resistant materials used in its producing and transporting is critical. Therefore, the oil and gas industry relies heavily on them.
Marine Engineering
Marine Engineering require steel materials that balance strength, fabrication efficiency, corrosion resistance, and long-term service performance.
Chemical Equiptemnts
Chemical Equipment includes many, such as pressure vessels, petrochemicals, power plants, chemical processing and medical equipment manufacturing.

More+>>

Latest News

Industry News

Inconel 625 vs Stainless Steel 316L

Inconel 625 is a nickel-based superalloy with high molybdenum and niobium, while 316L is an iron-based austenitic stainless steel. The most consequential difference is the nickel-to-iron ratio: Inconel 625 has Ni ≥58% vs ~11% in 316L. This is why Inconel 625 is immune to chloride stress corrosion cracking while 316L is vulnerable above 60°C. The second-most consequential difference is molybdenum: 8-10% in Inconel 625 vs 2-3% in 316L-the primary reason Inconel 625 has PREN ≥45 vs PREN 23-26 for 316L.

12/08/2026

Industry News

Industry News

Inconel 625 vs Monel 400: Which Nickel Alloy Is Better for Your Application?

This article provides a complete comparison of Inconel 625 vs Monel 400, including chemical composition, mechanical properties, corrosion resistance, temperature capability, applications, and material selection guidance.

10/08/2026

Industry News

Industry News

Inconel 625 vs Incoloy 825: Which Nickel Alloy Is Right for Your Application?

This guide provides the composition, corrosion, mechanical, welding, cost, and application data to make the correct selection every time.

07/08/2026

Industry News

Industry News

Inconel 625 vs Hastelloy C276: A Complete Alloy Comparison

Inconel 625 vs Hastelloy C276: Full technical comparison of UNS N06625 vs N10276 — corrosion resistance in HCl, seawater & acids, mechanical properties, PREN, CPT, welding, cost & application guide. Updated 2026.

05/08/2026

Industry News

Industry News

Inconel 625 vs Inconel 718: Definitive Comparison Guide for Engineers

Composition, Mechanical Properties, Corrosion Resistance, Temperature Capability, Weldability, Cost — and How to Choose the Right Alloy for Your Application

03/08/2026

Industry News

Inconel 625 for Chemical Processing Plants

Inconel 625, a nickel-chromium-molybdenum-niobium solid-solution strengthened alloy, resolves all three simultaneously through its ≥58% nickel matrix, 20–23% chromium (oxidation defense), and 8–10% molybdenum (pitting/crevice resistance). Its PREN of ~49 places it in the highest tier of weldable corrosion-resistant alloys, and its niobium stabilization eliminates sensitization during welding.

31/07/2026

Industry News

Inconel 625 for Heat Exchangers

Heat exchangers are the workhorses of process industry—they transfer thermal energy between fluids that are often hot, corrosive, pressurized, and laden with chlorides or acids. When the service environment pushes beyond what stainless steel can survive, engineers turn to nickel alloys. Inconel 625 (UNS N06625) has become the default choice for severe-service heat exchangers because it combines high strength, exceptional corrosion resistance, and fabricability in one material.

29/07/2026

Industry News

Industry News

Inconel 625 for Marine Engineering: Seawater-Resistant Alloy for Offshore, Shipbuilding & Subsea

This guide covers 625 alloy's performance across offshore platforms, subsea equipment, shipbuilding, and naval applications -- with quantitative comparisons, real case studies, and product-form guidance.

27/07/2026

Industry News

FAQs

What types of stainless steel and nickel alloy pipe fittings does our company mainly produce?

We specialize in producing various high-quality stainless steel and nickel alloy pipe fittings. Our main products include:

Stainless Steel Pipe Fittings Series:

Materials: 304, 304L, 316, 316L, 321, 347, 2205 duplex stainless steel, 2507 super duplex stainless steel

Types: Elbows, Tees, Reducers, Pipe Caps, Flanges, Pipe Fittings, Flange Short Sections

Nickel Alloy Pipe Fittings Series:

Materials: Inconel 600/625/718, Hastelloy C276/B2/B3, Monel 400/K500

Types: High-temperature and high-pressure pipe fittings, corrosion-resistant pipe fittings, special environment pipe fittings.
What is our Minimum Order?

Yes, usually 100KGS for each sizes, please contact us when you are trying to purchase less than container load.
Is the Sample for free or not?

Samples offered with Free, until our customer is completely satisfied . But you have to pay the shipping charge.

What are the differences between 304, 316, and duplex stainless steel? How to choose?

Material Types	Chemical Composition	Corrosion resistance	Mechanical strength	Applications	Cost
304 Stainless Steel	18%Cr-8%Ni	Good	Medium	General industrial environments, food and pharmaceuticals	Low
316 Stainless Steel	16%Cr-10%Ni-2%Mo	Excellent	Medium	Chemical industry, marine environments, chloride ion environments	Medium
Duplex Stainless Steel	22%Cr-5%Ni-3%Mo-N	Very good	High	Seawater, petrochemicals, high temperature and high pressure environments	High

Selection Recommendations:

General Use: 304 stainless steel offers the best cost-performance ratio.

High Corrosion Resistance: Choose 316 stainless steel (especially for chlorine-containing environments).

High Strength and Corrosion Resistance: Choose duplex stainless steel 2205/2507.

Specific Selection: Please contact our technical engineers for professional advice based on your working conditions.

What are the advantages of nickel alloy pipe fittings compared to stainless steel?

Nickel alloys have significant advantages in specific environments:

High-Temperature Performance:

Operating temperature can reach over 1000°C. Maintains good strength and oxidation resistance at high temperatures. Suitable for boilers, heat exchangers, and high-temperature furnaces.

Extreme Corrosive Environments:

Resistant to strong acids (sulfuric acid, hydrochloric acid, phosphoric acid). Resistant to strong alkalis and halide corrosion. Resistant to stress corrosion cracking.

Special Properties:

Good low-temperature toughness. Excellent creep resistance. Strong fatigue resistance.

Typical Applications:

Chemical Equipment: Reactors, Distillation Towers
Oil & Gas: Acid Gas Field Pipelines
Power Industry: Boiler Tubes, Superheater Tubes
Aerospace: Engine Components
How to choose the size standard and pressure rating for pipe fittings?
We offer a comprehensive range of size standards and pressure ratings:

Size Standards:
- International Standards: ASME B16.9, B16.11, B16.28
- European Standards: EN 10253, DIN 2605
- National Standards: GB/T 12459, GB/T 13401
- Japanese Standards: JIS B2311, B2312, B2313
Pressure Ratings:
- American Standards: SCH 10S, 40S, 80S, 160S, XXS
- European Standards: PN6, PN10, PN16, PN25, PN40
- Special Ratings: Customized according to customer requirements
Selection Guidelines:
- Confirm Operating Pressure: 1.5-2 times the design pressure for safety.
- Consider Temperature Effects: Material strength decreases at high temperatures.
- Media Characteristics: Corrosive media require higher ratings.
- Service Life: Higher ratings are recommended for long-term use.
How does your company guarantee product quality?

We have established a comprehensive quality assurance system:

1. Raw Material Control:

All raw materials are sourced from renowned steel mills (Baosteel, Taiyuan Iron & Steel, POSCO, etc.).

Each batch of materials undergoes chemical composition and mechanical property testing.

Material traceability management (heat number and batch number tracking).

2. Production Process Control:

CNC machining ensures dimensional accuracy.

Welding procedure qualification (PQR/WPS).

Online inspection to promptly detect quality issues.

3. Testing Equipment:

Spectrometer: Material composition analysis.

Universal testing machine: Mechanical property testing.

Metallurgical microscope: Microstructure analysis.

Non-destructive testing equipment: UT, PT, MT, RT testing.

4. Certification System:

ISO 9001 Quality Management System Certification.

PED/CE EU Pressure Equipment Directive Certification.

ASME U stamp certification.

Special Equipment Manufacturing License.

5. Factory Inspection:

100% dimensional inspection.

Surface quality inspection.

Pressure testing (hydraulic/air pressure).

Final packaging inspection.
What certifications and testing reports are available for our products?
We provide complete certification and testing documents:

Required Documents:
- Material Certificate: MTC (Material Test Certificate)
- Chemical Composition Report: Spectroscopic Analysis Report
- Mechanical Property Report: Tensile, Hardness, Impact Test Reports
- Non-Destructive Testing Report: UT/PT/MT Test Reports
- Dimensional Inspection Report: Dimensional records conforming to standards
- Pressure Test Report: Hydrostatic/Gas Pressure Test Records
Optional Documents:
- Heat Treatment Report
- Metallographic Analysis Report
- Corrosion Test Report
- Third-Party Inspection Report (SGS, BV, TÜV, etc.)
Certificates:
- Copy of Quality System Certification Certificate
- Product Certification Certificate
- Factory Qualification Certificate
What is the service life of pipe fittings?

The service life of pipe fittings is affected by several factors:

Material Selection: Suitable materials can extend service life by 3-5 times.
Operating Environment: Temperature, pressure, media corrosiveness.
Usage Conditions: Frequent start-stop cycles, temperature and pressure fluctuations.
Maintenance: Regular inspection and maintenance.

Estimated Service Life:

General Industrial Environment: 304/316 Stainless Steel - 15-20 years
Chemical Environment: Duplex Stainless Steel/Nickel Alloy - 20-25 years
High Temperature and High Pressure Environment: Nickel Alloy - 15-20 years
Seawater Environment: Super Duplex Stainless Steel/High Alloy - 20-30 years

Recommendations for Extending Service Life:

Select suitable materials and specifications
Avoid operation under excessive temperature and pressure
Regularly inspect wall thickness and corrosion
Replace damaged parts promptly.
What is your company's delivery time?

The delivery cycle depends on the complexity and quantity of the product:

Standard Products (Common Sizes, Common Materials):

Small Batch (<100 pieces): 7-15 working days
Medium Batch (100-500 pieces): 15-30 working days
Large Batch (>500 pieces): 30-60 working days

Customized Products:

Simple Customization (Special Sizes): 15-25 working days
Complex Customization (Special Materials/Processes): 25-40 working days
High-Difficulty Customization (Mold Development Required): 40-60 working days

Expedited Service:

We offer expedited production services, which can shorten the standard cycle by 30-50%. Expedited fees are negotiable based on the urgency.
How to place an order? What payment methods are available?
Ordering Process:
1. Technical Consultation: Provide operating parameters and receive material selection advice.
2. Quote Confirmation: Receive a detailed quotation and confirm price and terms.
3. Contract Signing: Sign a formal sales contract.
4. Production Arrangement: Production begins after prepayment.
5. Delivery and Acceptance: Upon completion of production, ship the goods and provide relevant documents.
6. After-Sales Service: Installation guidance and technical support.
Payment Methods:
- Wire Transfer: Transfer from company bank account.
- Letter of Credit: Accepts sight letters of credit (L/C at sight).
- Banker's Draft: Accepts bank acceptance drafts.
- Online Payment: Supports Alipay and WeChat Pay (small amounts).
- Installment Payment: Installment payment can be negotiated for large orders.
Payment Ratio:

Prepayment: 30% (after contract signing)
Pre-shipment Payment: 60% (before shipment upon completion of production)
Warranty Deposit: 10% (paid 6-12 months after acceptance)
What are our product packaging and shipping options?
We offer a variety of packaging and shipping options:

Packaging Methods:
- Standard Packaging:
  
  Wooden Crate Packaging: Moisture-proof, shockproof, suitable for long-distance transport
  
  Pallet Packaging: Suitable for container transport
  
  Stretch Wrap Packaging: Dust-proof and moisture-proof
- Marking and Labeling:
  
  Each product has a permanent mark.
  
  Clearly marked exterior packaging.
  
  Packing list and product list included.
Shipping Methods:
- Domestic Shipping:
  
  Express: Small samples (SF Express, Deppon Logistics)
  
  Dedicated Line Logistics: Bulk shipments
  
  Full Truckload Shipping: Large shipments
- International Shipping:
  
  Sea Freight: Full Container Load (FCL)/Less than Container Load (LCL)
  
  Air Freight: Urgent small shipments
  
  International Express: DHL, FedEx, UPS
Insurance Services:
- Transportation insurance provided.
- Compensation for lost or damaged goods.
- Real-time cargo tracking.
In which industries are stainless steel pipe fittings most widely used?

Stainless steel pipe fittings are widely used in the following industries:

1. Petrochemical Industry:

Oil refining units: catalytic cracking, hydrocracking
Chemical equipment: reactors, heat exchangers, towers
Natural gas processing: desulfurization, dehydration units

2. Power Energy Industry:

Thermal power generation: boiler pipes, steam and water pipes
Nuclear power: nuclear island, conventional island pipes
New energy: solar thermal power generation, geothermal power generation

3. Food and Pharmaceutical Industry:

Food processing: beverage, dairy production lines
Pharmaceutical equipment: clean piping, bioreactors
Drinking water treatment: water supply pipes, water treatment equipment

4. Marine Engineering:

Offshore platforms: production platforms, drilling platforms
Shipbuilding: ballast water systems, fuel oil systems
Seawater desalination: reverse osmosis unit pipes

5. Building Decoration:

Building water supply and drainage: drinking water pipes
Decorative engineering: handrails, railings, curtain walls
HVAC: heating and ventilation ducts
How to determine if pipe fittings need replacement or repair?
Indications requiring immediate replacement:
- Severe corrosion: Wall thickness reduction exceeding 10% of design thickness
- Obvious cracks: Cracks or defects visible to the naked eye
- Severe deformation: Obvious bending, twisting, or flattening
- Leakage: Media leakage that cannot be resolved by tightening.
Indications requiring maintenance or monitoring:
- Minor corrosion: Uniform corrosion, thinning <10%.
- Surface defects: Scratches, pits that do not affect the structure.
- Minor deformation: Minor deformation that can be corrected.
- Connection problems: Flange damage, thread damage.
What are your company's competitive advantages compared to others?
1. Technological Advantages:
- Professional technical team with over 20 years of industry experience
- Independent R&D capabilities, multiple patented technologies
- Comprehensive testing laboratory and technology center
2. Quality Advantages:
- Strict quality control system
- Complete international standard certifications
- 100% factory inspection, zero-defect target
3. Service Advantages:
- Rapid response, 24-hour technical consultation
- Customized solutions
- Comprehensive after-sales service network
4. Supply Chain Advantages:
- Stable raw material supply channels
- Modern production equipment
- Efficient logistics and distribution system
5. Cost-Effectiveness Advantages:
- Reasonable pricing
- Preferential policies for long-term cooperation
- Comprehensive technical support and training
6. Customer Testimonials:
- Over 500 long-term cooperative clients
- Customer satisfaction rate over 98%
- Recipient of "Excellent Supplier" award multiple times

We are one of the prominent manufacturers,suppliers and exporters of fittings, flanges, forgings, fasteners, pipes/tubes, plates/sheets, bars/rods, etc. in various material grades.

Tel: +86 19339900211

Email:Info@jnalloy.com

Add: Stainless steel Market 289, Xinwu District , Wuxi, China