DIN 1.4439 (AISI 317LMN / UNS S31726) Supplier in India – Dipti Metal Industries

Company Overview

Dipti Metal Industries, headquartered in Mumbai, India, is a certified DIN 1.4439 (AISI 317LMN / UNS S31726) Supplier, Manufacturer, Stockist, Dealer, and Exporter. Founded in 2009 by Mr. Kumpsingh Rajput, we have established global supply chains, exporting to more than 56 countries under the “DIPTI” brand.

We supply DIN 1.4439 Pipes, DIN 1.4439 Pipe Fittings, DIN 1.4439 Flanges, DIN 1.4439 Fasteners, DIN 1.4439 Valves, and DIN 1.4439 Gaskets, backed by complete certifications and third-party inspection.

📧 Contact: info@diptimetal.in

🔹 About DIN 1.4439 (317LMN)

DIN 1.4439, also known as AISI 317LMN, UNS S31726, or X2CrNiMoN17-13-5, is a nitrogen-alloyed, molybdenum-enriched austenitic stainless steel. It offers enhanced resistance against chlorides, aggressive acids, and high-corrosion environments, while delivering higher mechanical strength compared to 316L.

🔹 International Equivalents

• DIN / EN: 1.4439 – X2CrNiMoN17-13-5

• AISI / ASTM: 317LMN

• UNS (USA): S31726

• BS (UK): 1.4439 Stainless Steel

• AFNOR (France): X2CrNiMoN17-13-5

• ISO / ONORM / UNE: X2CrNiMoN17-13

🔹 Chemical Composition (% by weight)

🔹 Mechanical Properties

• Yield Strength (Rp0.2): 210 – 280 MPa

• Tensile Strength (Rm): 490 – 800 MPa (typical range 580 – 800 MPa)

• Elongation (A5): ≥ 20 – 35%

• Hardness (HB): 130 – 250

• Impact Toughness: ≥ 50 J at room temperature

🔹 Physical Properties

• Density: 8.0 g/cm³

• Elastic Modulus: ~200 GPa

• Thermal Conductivity: ~14 W/m·K

• Specific Heat: ~500 J/kg·K

• Electrical Resistivity: ~0.85 Ω·mm²/m

• Magnetic Properties: Non-magnetic in annealed condition

🔹 Standards & Specifications

• EN 10216-5 – Seamless pressure tubes

• ASTM A240 – Plates and sheets

• ASTM A312 – Seamless and welded pipes

• ASTM A403 – Pipe fittings

• ASTM A182 – Forged fittings and flanges

• ASTM A276 – Bars and rods

🔹 Product Supply Range – DIN 1.4439

• DIN 1.4439 Pipes & Tubes: Seamless, welded, fabricated

• DIN 1.4439 Pipe Fittings: Elbows, tees, reducers, caps, stub ends

• DIN 1.4439 Flanges: Weld Neck, Slip-On, Blind, Socket Weld, Threaded

• DIN 1.4439 Fasteners: Bolts, Nuts, Studs, Washers, Screws

• DIN 1.4439 Plates & Sheets: Hot-rolled, cold-rolled, custom cut sizes

• DIN 1.4439 Bars & Rods: Round, flat, hexagonal, forged

• DIN 1.4439 Valves & Gaskets: Full industrial range

🔹 Applications

• Chemical and petrochemical processing

• Pulp & paper industry

• Food and pharmaceutical equipment

• Marine and offshore structures

• Desalination and water treatment plants

• Pressure vessels and heat exchangers

• Pumps, valves, and general engineering

🌍 Global Export Reach

We export DIN 1.4439 (AISI 317LMN) products to:

• Middle East: UAE, Saudi Arabia, Oman, Qatar, Kuwait

• Europe: Germany, UK, France, Italy, Spain, Poland

• North America: USA, Canada, Mexico

• South America: Brazil, Argentina, Chile

• Asia-Pacific: Japan, Singapore, South Korea, China, Australia

• Africa: South Africa, Egypt, Nigeria, Kenya

All exports are shipped from India’s major ports: Nhava Sheva, Mundra, Kandla, Chennai, Hazira, Cochin, Vizag, Kolkata.

🔹 Certifications & Quality

• ISO 9001:2015 Certified

• EN 10204 3.1 / 3.2 Material Test Certificates

• PED & NACE MR0175 Compliant

• Third-party inspections: TÜV, SGS, BV, DNV

• 100% traceability with heat numbers

❓ Frequently Asked Questions (FAQ)

Q1: What is DIN 1.4439 also called?
A: AISI 317LMN, UNS S31726, or X2CrNiMoN17-13-5.

Q2: What makes DIN 1.4439 special?
A: It has added nitrogen and molybdenum for superior strength and chloride resistance.

Q3: Is DIN 1.4439 weldable?
A: Yes, it is easily weldable with suitable filler metals.

Q4: Where is DIN 1.4439 commonly used?
A: In chemical plants, marine equipment, pharmaceutical machinery, and food processing.

Q5: What are its typical mechanical strengths?
A: Yield 210–280 MPa, tensile 490–800 MPa, elongation ≥ 20–35%, hardness ≤ 250 HB.

Q6: Can DIN 1.4439 be hardened?
A: No, it cannot be hardened by heat treatment, only cold work.

Q7: Is it resistant to chlorides?
A: Yes, it is especially resistant in chloride-containing environments.

Q8: Is it magnetic?
A: No, it remains non-magnetic in the annealed condition.

Q9: What certifications are supplied?
A: ISO, EN 10204 MTCs, PED, NACE, and third-party inspection.

Q10: Why choose Dipti Metal Industries?
A: Certified quality, wide range, strong export network, competitive pricing, and proven reliability.