DIN 1.4429 (AISI 316LN / UNS S31653) Supplier in India – Dipti Metal Industries

Company Overview

Dipti Metal Industries, based in Mumbai, India, is a leading DIN 1.4429 (AISI 316LN / UNS S31653) Supplier, Manufacturer, Stockist, Dealer, and Exporter. Since 2009, under the leadership of Mr. Kumpsingh Rajput, our company has supplied premium stainless steel solutions to more than 56 countries under the “DIPTI” brand.

We supply a complete range of DIN 1.4429 Pipes, DIN 1.4429 Pipe Fittings, DIN 1.4429 Flanges, DIN 1.4429 Fasteners, DIN 1.4429 Valves, and DIN 1.4429 Gaskets, all certified and traceable.

📧 Contact: info@diptimetal.in

---

🔹 About DIN 1.4429 (316LN)

DIN 1.4429, also referred to as AISI 316LN or UNS S31653, is a nitrogen-enhanced, low-carbon stainless steel. It offers excellent resistance to pitting and crevice corrosion, superior strength, and outstanding toughness at both ambient and cryogenic temperatures. This grade is widely used in nuclear, chemical, pharmaceutical, and cryogenic service applications.

---

🌍 International Equivalents

• DIN / EN (Europe): 1.4429 – X2CrNiMoN17-13-3

• AISI / ASTM (USA): 316LN

• UNS (USA): S31653

• BS (UK): 316S63

• AFNOR (France): Z3CND17-12Az

• JIS (Japan): SUS 316LN

• ISO / International: 316LN

---

🔹 Chemical Composition (Typical %)

---

🔹 Mechanical Properties

• Tensile Strength (Rm): 530 – 750 MPa

• Yield Strength (Rp0.2): ≥ 240 MPa (often higher due to nitrogen)

• Elongation (A5): ≥ 40%

• Impact Toughness: Excellent even at cryogenic temperatures

• Hardness (HB): ≤ 215

---

🔹 Physical Properties

• Density: 8.0 g/cm³

• Elastic Modulus: ~200 GPa

• Thermal Conductivity: ~15 W/m·K

• Specific Heat: ~500 J/kg·K

• Electrical Resistivity: ~0.75 Ω·mm²/m

• Magnetic Properties: Very low permeability, nearly non-magnetic

---

🔹 Standards & Specifications

Pipes & Tubes

• ASTM A312 / ASME SA312 – Seamless and welded pipes

• ASTM A213 / ASME SA213 – Seamless boiler, superheater, and heat-exchanger tubes

• ASTM A249 / ASME SA249 – Welded heat-exchanger and condenser tubes

• EN 10216-5 – Seamless stainless tubes for pressure purposes

• EN 10217-7 – Welded stainless tubes for pressure purposes

• JIS G3459 – Stainless steel pipes

• GOST 9941 – Seamless stainless steel tubes

Plates & Sheets

• ASTM A240 / ASME SA240 – Stainless steel plates and sheets

• EN 10028-7 – Flat products for pressure purposes – Stainless steels

• DIN EN 10088-2 – Stainless steels for general purposes (sheets/plates/strips)

• JIS G4304 / G4305 – Hot-rolled and cold-rolled stainless steel sheets

Bars & Rods

• ASTM A276 / ASME SA276 – Stainless steel bars and shapes

• ASTM A479 / ASME SA479 – Bars and rods for pressure vessels

• DIN EN 10272 – Stainless steel bars for pressure purposes

• JIS G4303 – Stainless steel bars

Pipe Fittings

• ASTM A403 / ASME SA403 – Wrought stainless steel fittings

• DIN EN 10222-5 – Forged stainless steel fittings

• MSS SP-43 – Stainless steel buttweld fittings

• JIS B2311 / B2312 – Stainless steel pipe fittings

Flanges

• ASTM A182 / ASME SA182 – Forged stainless steel flanges

• DIN EN 1092-1 / 1092-2 – European flanges

• BS 4504 – Circular flanges

• JIS B2220 – Pipe flanges

• GOST 12820 / 12821 – Flat and welded flanges

Fasteners

• ASTM A193 / ASME SA193 – Stainless steel bolts and studs

• ASTM A194 / ASME SA194 – Stainless steel nuts

• ASTM F593 – Stainless steel bolts, studs, cap screws

• ASTM F594 – Stainless steel nuts

• ISO 3506 – Stainless fasteners mechanical properties

• DIN 931 / 933 / 934 / 975 – Bolts, screws, nuts, threaded rods

• BS 6105 – Stainless steel fasteners

Valves

• ASTM A182 / ASME SA182 – Forged stainless steel valves and parts

• API 600 / 602 / 603 – Gate valves and corrosion-resistant valves

• DIN EN 12516 – Strength requirements for valves

• BS EN 12266 – Testing of metallic valves

• ISO 5208 – Pressure testing of valves

• MSS SP-61 – Pressure testing of steel valves

Gaskets

• ASME B16.20 – Metallic gaskets (spiral wound, ring joint, corrugated)

• ASME B16.21 – Non-metallic flat gaskets

• DIN EN 1514-1 – Flanges and joints – gasket dimensions

• BS 4865 – Gaskets for use with flanges

---

🔹 Product Supply Range – DIN 1.4429

• DIN 1.4429 Pipes & Tubes: Seamless, welded, fabricated

• DIN 1.4429 Pipe Fittings: Elbows, Tees, Reducers, Caps, Stub Ends

• DIN 1.4429 Flanges: Weld Neck, Slip-On, Blind, Socket Weld, Threaded

• DIN 1.4429 Fasteners: Bolts, Nuts, Studs, Washers, Screws

• DIN 1.4429 Plates & Sheets: Hot-rolled, cold-rolled, cut-to-size

• DIN 1.4429 Bars & Rods: Round, Flat, Hex, Forged

• DIN 1.4429 Valves & Gaskets: Complete industrial range

---

🔹 Applications

• Nuclear and cryogenic systems

• Chemical and pharmaceutical plants

• High-purity water and desalination plants

• Heat exchangers, tanks, and pressure vessels

• Offshore and marine industries

• Piping systems exposed to chlorides and harsh chemicals

---

🌍 Global Export Reach

We export DIN 1.4429 (AISI 316LN) 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

Shipments are handled through major Indian 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 1.4429 also known as?
A: AISI 316LN, UNS S31653, X2CrNiMoN17-13-3.

Q2: How is it different from 316L?
A: DIN 1.4429 has nitrogen, giving higher strength and toughness, especially at cryogenic temperatures.

Q3: Where is DIN 1.4429 commonly used?
A: In nuclear, cryogenic, chemical, pharmaceutical, and offshore industries.

Q4: What are its key strengths?
A: Tensile 530–750 MPa, yield ≥ 240 MPa, elongation ≥ 40%, hardness ≤ 215 HB.

Q5: Is it weldable?
A: Yes, with standard stainless steel welding techniques.

Q6: Is it magnetic?
A: Practically non-magnetic in annealed condition.

Q7: Can it be hardened?
A: No, only cold working increases strength.

Q8: Does it resist chloride attack?
A: Yes, it performs excellently in chloride-rich environments.

Q9: Are certifications available?
A: Yes – ISO, EN 10204 MTCs, PED, NACE, and third-party inspections.

Q10: Why choose Dipti Metal Industries?
A: Proven global supplier since 2009, wide inventory, competitive pricing, certified quality.