DIN 1.4547 (254 SMO / UNS S31254) Supplier in India – Dipti Metal Industries

Company Overview

Dipti Metal Industries, based in Mumbai, India, is a reputed DIN 1.4547 (254 SMO / UNS S31254) Supplier, Manufacturer, Stockist, Dealer, and Exporter. Since 2009, under the leadership of Mr. Kumpsingh Rajput, we have exported to more than 56+ countries worldwide, serving industries under our global brand “DIPTI”.

We supply a complete range of DIN 1.4547 Pipes, DIN 1.4547 Pipe Fittings, DIN 1.4547 Flanges, DIN 1.4547 Fasteners, DIN 1.4547 Valves, and DIN 1.4547 Gaskets, all certified for international markets.

📧 For inquiries: info@diptimetal.in

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🔹 About DIN 1.4547 (254 SMO)

DIN 1.4547, also known as 254 SMO / UNS S31254 / F44, is a high-alloy austenitic stainless steel developed for extremely aggressive environments, especially halide-containing solutions and seawater.

• Very high resistance to pitting and crevice corrosion

• Excellent resistance to stress corrosion cracking

• Superior strength due to nitrogen content

• Non-magnetic in the annealed condition

• Good ductility and weldability

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🔹 International Equivalents

• EN/DIN: 1.4547 – X1CrNiMoCuN20-18-7

• UNS (USA): S31254

• AISI / ASTM: 254 SMO

• Trade Name: F44

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🔹 Chemical Composition (Typical %)

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🔹 Mechanical Properties (Solution Annealed)

• Tensile Strength (Rm): 650–850 MPa

• Yield Strength (Rp0.2): ≥ 300 MPa

• Yield Strength (Rp1.0): ≥ 340 MPa

• Elongation (A5): ≥ 35%

• Impact Energy (20 °C): ≥ 100 J

• Hardness: ≤ 260 HB

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🔹 Physical Properties

• Density: 8.0 g/cm³

• Elastic Modulus (20 °C): 200 GPa

• Thermal Expansion (20–400 °C): 16–17 ×10⁻⁶/K

• Thermal Conductivity (20 °C): 13 W/m·K

• Specific Heat (20 °C): 500 J/kg·K

• Electrical Resistivity (20 °C): 0.85 Ω·mm²/m

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🔹 Heat Treatment

• Solution Annealing: 1140–1200 °C, rapid cooling in air/water

• Stress Relief Annealing: Max 500 °C (up to 5h)

• Cannot be hardened by heat treatment (only by cold working)

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🔹 Fabrication & Welding

• Hot Forming: 1200–950 °C

• Cold Forming: Easily formable, but work-hardens quickly

• Welding: Good weldability; avoid TIG welding without filler due to loss of corrosion resistance

• Recommended Filler Metals: High-alloy types (e.g., Avesta P12, P16)

• Surface Finish: Available pickled, machined, or peeled

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🔹 Standards

• EN 10272: Stainless steel bars for pressure purposes

• EN 10088-3: Stainless steels – technical delivery for bars, rods, and sections

• ASTM A182 / ASME SA182: Forged flanges and fittings

• ASTM A240 / ASME SA240: Plates and sheets

• ASTM A312 / ASME SA312: Pipes and tubes

• ASTM A276 / A479: Bars for pressure vessels and general purposes

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🔹 Applications

• Seawater desalination systems

• Offshore oil & gas platforms

• Chemical and petrochemical plants

• Flue gas desulfurization systems

• Pulp and paper industry

• Shipbuilding and marine scrubbers

• Heat exchangers and pressure vessels

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🌍 Global Export Reach

We export DIN 1.4547 (254 SMO) to:

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

Exports are shipped via Nhava Sheva, Mundra, Kandla, Chennai, Hazira, Cochin, Vizag, and Kolkata.

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🔹 Certifications & Quality

• ISO 9001:2015 Certified

• EN 10204 3.1 / 3.2 Test Certificates

• PED & NACE MR0175 Compliance

• Third-Party Inspections: TÜV, SGS, BV, DNV

• Full Material Traceability

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❓ Frequently Asked Questions (FAQ)

Q1: What is DIN 1.4547 also known as?
A: 254 SMO, UNS S31254, or F44.

Q2: What makes DIN 1.4547 unique?
A: Very high resistance to pitting, crevice, and stress corrosion cracking in seawater and halide environments.

Q3: Can it be welded?
A: Yes, but avoid TIG welding without filler. Use high-alloy filler metals for best results.

Q4: Is it stronger than 316L?
A: Yes, higher yield and tensile strength due to nitrogen content.

Q5: Where is it used most?
A: Desalination plants, offshore platforms, chemical processing, pulp & paper.

Q6: Can it be hardened?
A: Not by heat treatment, only through cold working.

Q7: What is the PREn value?
A: Around 42–44, excellent for seawater resistance.

Q8: What certifications are supplied?
A: ISO, EN 10204, PED, NACE, third-party inspection.

Q9: What surface finishes are available?
A: Pickled, machined, or peeled.

Q10: Why choose Dipti Metal Industries?
A: 15+ years of experience, certified quality, global exports, competitive pricing, and strong logistics.