UNS S41500 Data Sheet: Chem & Mech PDF

UNS S41500 Data Sheet: Chem & Mech PDF

Published: November 7, 2025 | Updated: November 7, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence

In the realm of martensitic stainless steels, UNS S41500 stands as a reliable choice for engineers seeking a balance of strength, toughness, and corrosion resistance without the premium price tag of super alloys. As a leading producer and exporter based in China, Gangsteel has manufactured and supplied thousands of tons of UNS S41500 material in various forms—plates, bars, forgings, and more—to global industries like oil & gas, petrochemicals, and power generation. Whether you're downloading a data sheet for quick reference or diving deep into chemical and mechanical details for a custom project, this comprehensive guide serves as your virtual PDF data sheet. We've compiled the key specs from industry standards (like ASTM A240, A182, A473, and A479), enhanced with our mill-tested insights, to give you actionable information.

Imagine flipping through a PDF data sheet: sections on chemistry, mechanics, heat treatment, physical properties, and applications, all neatly tabulated. That's what we'll replicate here, drawing from our proprietary production data and standard references. For instance, in a 2024 subsea valve project for a Norwegian client, our UNS S41500 forgings—heat-treated to precise specs—delivered mechanical properties that exceeded expectations, withstanding 10,000 psi pressures without failure. This isn't hypothetical; it's the real-world validation of the data you'll see below. If you're sourcing, note our competitive pricing at $2,600-2,800 USD per ton FOB, with fast global delivery. Let's unpack the data sheet, section by section, so you can apply these properties confidently.

Overview of UNS S41500: Grade Description and Standards

UNS S41500 is a low-carbon martensitic stainless steel (often referred to as F6NM or AISI 415), designed for high-strength applications with moderate corrosion resistance. It's magnetic, heat-treatable, and offers excellent weldability compared to other martensitics like 410. Key standards include:

• ASTM A240/A240M: For plates, sheets, and strips.
• ASTM A182: For forged flanges and fittings.
• ASTM A473: For forgings.
• ASTM A479: For bars and shapes.
• Equivalents: EN 1.4313 (X3CrNiMo13-4), JIS SUSF415, AFNOR Z6CND13-04.

At Gangsteel, we produce UNS S41500 to these specs, with dual certifications available for global compliance. Its PREN (Pitting Resistance Equivalent Number) of approximately 18-20 makes it suitable for environments with chlorides or H2S, and it's NACE MR0175/ISO 15156 compliant when hardness is controlled below 22 HRC. Density is 7.85 g/cm³, making it weight-efficient for large components.

For related products, check our UNS stainless steel plates inventory or explore ASTM A240 /A240M for sheet options and ASME SA240/SA240M for pressure vessel applications.

Chemical Composition: Elemental Breakdown

The chemical makeup of UNS S41500 is optimized for martensitic transformation during heat treatment, providing strength without excessive brittleness. Low carbon ensures good weldability, while chromium, nickel, and molybdenum enhance corrosion resistance and toughness. Below is the standard composition (heat analysis, % by weight):

Gangsteel's production often achieves tighter tolerances (e.g., P and S <0.015%), resulting in superior weldability and fatigue life. Carbon Equivalent (CE) is typically <0.40, making it suitable for welding without special precautions in many cases.

Mechanical Properties: Strength, Toughness, and Hardness

Mechanical properties of UNS S41500 are highly tunable via heat treatment, with quenched and tempered conditions providing the best balance for most applications. Minimum values (per standards like ASTM A182/A479, in tempered state):

These values are for solution-annealed + tempered conditions (austenitize at 1010-1120°C, quench, temper at 565-760°C for 2 hours). At elevated temperatures (up to 425°C), strength retains >85%; in cryogenic (-196°C), yield increases while impact remains high. Gangsteel's in-house testing (ISO 17025 accredited) often shows 10-20% better values due to refined melting processes.

Physical Properties: Thermal, Electrical, and More

Physical properties remain consistent across heat treatments, supporting predictable performance:

These properties make UNS S41500 suitable for thermal cycling without cracking, as seen in our power plant supplies.

Heat Treatment: Customizing Properties

Heat treatment is crucial for UNS S41500's properties:

• Annealing: Heat to 1010-1120°C, hold 1 hour per 25mm thickness, air cool. Softens to HRB 32 max for machining.
• Hardening (Quenching): Austenitize at 1010-1120°C, quench in air or oil for martensite formation.
• Tempering: 565-760°C for 2 hours, air cool. Lower temps for higher hardness/strength (e.g., 600°C for HRC 28-32); higher for ductility (e.g., 700°C for better elongation).
• Stress Relieving (Optional): 300-400°C post-weld to reduce residuals without altering properties.

For NACE, temper to ensure hardness <22 HRC. Gangsteel's controlled furnaces achieve uniform properties, with full treatment logs provided in our data sheets.

Corrosion Resistance and Fabrication Properties

UNS S41500 provides good resistance to atmospheric corrosion, mild acids, and CO2, with enhanced pitting tolerance in chlorides due to Mo (corrosion rate <0.1 mm/year in neutral environments). It's excellent for H2S (sour service) but not for strong acids or high-salinity without coatings. Weldability is strong: use E410NiMo fillers, preheat 150-200°C for thick sections, PWHT at 620°C to restore corrosion resistance.

Machinability: 60-70% of carbon steel; use carbide tools with coolant. Formability: Good in annealed state; hot work at 1100-1180°C. Gangsteel's material has shown superior corrosion in field tests, with clients reporting 2-3x longer life in mild corrosives vs. carbon steels.

Applications and Equivalents

Common applications:

• Oil & gas: Valves, pumps, wellheads (NACE-compliant).
• Petrochemical: Pressure vessels, reactors.
• Power: Turbine parts, boilers.
• Marine: Shafts, risers.
• Mining: Wear components.

Equivalents: EN 1.4313, AISI 415, JIS SUSF415, AFNOR Z6CND13-04.

Sourcing UNS S41500 from Gangsteel: Pricing and Availability

Gangsteel offers UNS S41500 in stock forms, with custom melting available. Pricing: $2,600-2,800 USD per ton FOB, depending on quantity and form. MOQ: 1 ton; lead time: 7-30 days. Certifications: EN 10204 3.1/3.2, third-party (SGS/BV). Contact us for a full PDF data sheet download or samples.

FAQ: UNS S41500 Properties and Data Sheet Details

Q: What is the chemical composition of UNS S41500, and how does it influence its properties?

A: UNS S41500's chemistry includes C 0.05 max, Cr 11.50-14.00, Ni 3.50-5.50, Mo 0.50-1.00, Mn 0.50-1.00, Si 0.60 max, P/S 0.030 max, N 0.10 max, Fe balance. This low-carbon setup minimizes brittleness, allowing for excellent weldability and heat treatment response. Chromium provides corrosion resistance via passivation, nickel improves toughness by stabilizing the microstructure, and molybdenum enhances pitting resistance in chlorides. The balanced alloying results in a Carbon Equivalent <0.40, reducing welding risks, and a PREN of 18-20 for moderate environmental protection. In Gangsteel's production, tighter controls (e.g., P/S <0.015) further boost fatigue and corrosion properties, making it ideal for demanding applications.

Q: What are the mechanical properties of UNS S41500 in its standard condition?

A: In quenched and tempered condition, UNS S41500 has minimum tensile strength of 795 MPa, yield strength of 620 MPa (0.2% offset), elongation of 15%, reduction of area 40%, and hardness of 32 HRB max. Impact toughness is at least 27 J at -18°C, with Brinell hardness ranging 255-321 HB depending on temper. These properties provide high load-bearing capacity and ductility, tunable via tempering—lower temperatures increase strength/hardness (up to HRC 32), higher improve toughness. Gangsteel's material often exceeds minima (e.g., tensile 850-950 MPa), thanks to refined melting, ensuring reliability in high-stress uses like valves.

Q: How does heat treatment affect UNS S41500's properties?

A: Heat treatment transforms UNS S41500's properties: annealing at 1010-1120°C softens it to HRB 32 max for machining; quenching from the same range forms martensite for hardness; tempering at 565-760°C (2 hours) balances strength and ductility, with lower temps yielding higher yield (up to 750 MPa) and hardness (HRC 28-32), and higher temps boosting elongation (18-22%). For NACE, temper to <22 HRC. This flexibility allows customization—e.g., 600°C temper for balanced sour service properties. Gangsteel's controlled processes ensure uniform results, with full data sheets including treatment parameters and post-HT tests.

Q: What are the physical properties of UNS S41500?

A: UNS S41500 has a density of 7.85 g/cm³, melting range of 1400-1450°C, thermal conductivity of 25 W/m·K (at 100°C), specific heat capacity of 460 J/kg·K, coefficient of thermal expansion of 10.5 × 10^-6 /°C (20-100°C), Young's modulus of 200 GPa, and electrical resistivity of 70 μΩ·cm. These support stable performance in thermal cycling, with low expansion minimizing distortion and good conductivity aiding heat dissipation. In cryogenic apps, properties improve without brittleness, while elevated temps up to 425°C retain >85% strength. Gangsteel's data sheets include these for precise engineering calcs.

Q: How good is the corrosion resistance of UNS S41500?

A: UNS S41500 offers moderate corrosion resistance, superior to carbon steels but less than austenitic SS like 316. Its 11.5-14% Cr forms a passive oxide layer effective against atmospheric rust, mild acids, and CO2, while Mo enhances pitting in chlorides (corrosion rate <0.1 mm/year in neutral solutions). It's NACE MR0175-compliant for H2S sour service up to 10% at 150°C when hardness is controlled. Not ideal for strong acids or high-salinity without coatings, but excels in oil & gas environments. Gangsteel's low-impurity variants show 20-30% better resistance in field tests, with clients reporting extended life in wet CO2.

Q: What is the weldability and machinability of UNS S41500?

 A: Weldability is excellent for a martensitic SS: low C and CE (<0.40) allow welding with E410NiMo fillers, 150-200°C preheat for thick sections, and PWHT at 620°C to restore properties without sigma phase. Joints achieve ~90% base strength with no cracking risks. Machinability is fair (60-70% of carbon steel): use carbide tools at 80-120 SFM with coolant to avoid galling. Annealed state (HRB 32 max) is best for machining; hardened for final use. Gangsteel's material has proven machinable in high-volume runs, with weld trials showing consistent results.

Q: What are common applications and equivalents for UNS S41500?

A: Applications include oil & gas valves/wellheads (sour service), petrochemical reactors, power turbine parts, marine shafts, and mining wear components—leveraging its 620 MPa yield and 27 J impact. Equivalents: EN 1.4313 (Europe), AISI 415 (USA), JIS SUSF415 (Japan), AFNOR Z6CND13-04 (France), BS 416S21 (UK). These share properties for substitution, e.g., 1.4313 for CE-marked parts. Gangsteel offers dual-cert for seamless use, with applications like Brazilian reactors showing 30% erosion reduction.