UNS S41500 Equivalent: 1.4313 & F6NM Chart

UNS S41500 Equivalent: 1.4313 & F6NM Chart

UNS S41500 is a martensitic stainless steel grade, commonly designated as F6NM in ASTM specifications like A182 for forgings. It is widely used for its balance of high strength, good toughness, and moderate corrosion resistance in applications such as pressure vessels, valves, and offshore components. Its closest equivalents include EN 1.4313 (X3CrNiMo13-4), which shares nearly identical chemical composition and mechanical properties, making them interchangeable in most cases. Below, I'll outline

the key equivalents and provide a comparison chart highlighting standards, grade names, chemical composition, and mechanical properties (based on standard heat-treated conditions like +QT780 for 1.4313, which aligns closely with typical UNS S41500 treatments).

Key Equivalents Overview

• UNS S41500 / F6NM: Primary USA designation (ASTM/UNS). F6NM is the common trade name, especially in ASTM A182 for forgings, but it applies to plates and bars as well.
• EN 1.4313 (X3CrNiMo13-4): European equivalent, used in EN 10088, EN 10250-4, and EN 10222-5 standards. Offers similar weldability and toughness.
• Other Common Equivalents:
  • AFNOR (France): Z6CN13-04 or Z6CND13-04
  • SS (Sweden): 2385
  • AISI (USA): 415 (approximate legacy equivalent)
  • JIS (Japan): SUSF415 or SUS Ti6NM (variant for similar properties)
  • DIN (Germany): 1.4313 (same as EN)

These grades are considered equivalent due to overlapping chemical ranges and mechanical performance, though always verify with specific standards for critical applications.

Comparison Chart: UNS S41500 vs. 1.4313 & F6NM

Since UNS S41500 and F6NM refer to the same material (F6NM is the ASTM nickname for S41500), the chart focuses on cross-standard comparisons. Properties are for quenched and tempered conditions (e.g., +QT780 for 1.4313, equivalent to typical S41500 tempering at ~620°C). Data is indicative; consult mill certificates for exact values.

Standards and Grade Names

Chemical Composition Comparison (% by Weight)

Compositions are nearly identical across equivalents, with minor range variations. Values shown are maxima unless specified as ranges.

Minor differences (e.g., Mn and S) are within tolerance for equivalence; always specify per application standard.

Mechanical Properties Comparison (Quenched & Tempered Condition)

Properties vary by heat treatment (e.g., +QT780 for 1.4313 ≈ temper at 780°C). Minimum values shown; actuals can be higher.

Both grades offer excellent toughness post-tempering, making them suitable for low-temperature uses down to -46°C. Equivalence allows substitution in most cases, but verify with standards like EN 10222-5 for 1.4313 in forgings.

Applications and Interchangeability

UNS S41500 (F6NM) and 1.4313 are interchangeable for applications like:

• Pressure vessels and valves (ASTM A182 / EN 10222-5)
• Offshore and marine components (resistant to chlorides and H2S)
• Pump and turbine parts (high strength and toughness)
• Chemical processing equipment (moderate corrosion resistance)

In Europe, 1.4313 is preferred for CE marking; in the USA, F6NM for API/ASME. Gangsteel, as a producer, offers dual-certified material to bridge these, ensuring seamless use in global projects.

If you need mill certificates, custom comparisons, or sourcing for these grades, contact us at Gangsteel for quotes—our stock includes both UNS S41500 and equivalent 1.4313 plates and forgings. For related products, explore our ASTM A240 /A240M or ASME SA240/SA240M offerings.