UNS S41500 Plates: 1-200mm Stock ASME

UNS S41500 Plates: 1-200mm Stock ASME

Published: November 07, 2025 | Updated: November 07, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence

In the world of high-performance stainless steel plates, UNS S41500 stands as a reliable powerhouse, offering a perfect blend of strength, corrosion resistance, and versatility for demanding industrial applications. With stock readily available in thicknesses from 1mm to 200mm under ASME specifications, Gangsteel—your trusted producer and exporter based in China—ensures you have access to premium material tailored to your needs.

Over the past 25 years, we've supplied thousands of tons of UNS S41500 plates to global projects in oil & gas, petrochemical, marine, and power sectors, where precision thickness and ASME compliance are non-negotiable. Whether you're fabricating pressure vessels that require robust 100mm plates or precision components from 5mm stock, this guide explores everything you need to know about UNS S41500 plates, from specs and properties to our extensive inventory and how to source them efficiently.

We've all faced the challenge: a tight deadline for a subsea manifold project, needing plates in exact thicknesses with ASME certs to meet API standards. In one such 2024 case for a Gulf client, our ready-stock 50mm UNS S41500 plates—forged to ASME SA240—arrived in 14 days, enabling seamless welding and installation without delays, ultimately saving 20% on project costs as per their audit. UNS S41500, often called F6NM or AISI 415, isn't just another martensitic stainless; its low-carbon design allows for thicknesses up to 200mm without compromising heat-treat response, making it ideal for heavy-duty stock. Density at 7.85 g/cm³ keeps weights manageable (e.g., a 2000mm x 1000mm x 50mm plate ~785 kg), while ASME compliance ensures global acceptance. Let's delve into the details, so you can leverage our 1-200mm stock for your next build.

Why Choose UNS S41500 Plates? Key Advantages and Overview

UNS S41500 is a low-carbon martensitic stainless steel optimized for high strength and moderate corrosion resistance, making it a top choice for plates in ASME-compliant applications. Under ASME SA240/SA240M, these plates are spec'd for pressure vessels, boilers, and general service, where thicknesses from 1mm (thin sheets for cladding) to 200mm (heavy forgings for hubs) provide flexibility without sacrificing properties. The grade's martensitic structure—tempered for toughness—offers a PREN of 18-22, resisting pitting better than 410 while costing less than duplex alloys.

At Gangsteel, our 1-200mm stock is mill-produced with vacuum induction melting for purity, ensuring plates meet ASME Section II requirements with full traceability. This range covers everything from 1-5mm for lightweight liners (density aiding portability) to 100-200mm for structural bases (high yield preventing deformation). Compared to austenitic 304 (softer, higher corrosion but lower strength), S41500 delivers 3x the yield at similar density, ideal for ASME VIII designs. We've stocked these for European refineries, where 20mm plates welded into exchangers endured 150°C corrosives for 5 years without thinning.

For broader options, explore our uns stainless steel plates catalog, featuring ASME-certified grades.

Detailed Specifications: Chemical Composition and Mechanical Properties

ASME SA240 outlines strict specs for UNS S41500 plates, ensuring they perform across the 1-200mm thickness range. Gangsteel's production includes 100% PMI and UT testing, with certs verifying compliance.

Chemical Composition: Balanced for Performance

Low impurities enable uniform properties even in 200mm thick plates.

This composition supports ASME's requirements, with Gangsteel's low-residual options for premium stock.

Mechanical Properties: Strength Across Thicknesses

Properties are heat-treatable, with values for quenched and tempered state.

Density 7.85 g/cm³ ensures weight calcs scale linearly with thickness—e.g., 1mm plate ~7.85 kg/m² vs. 200mm ~1,570 kg/m².

Stock Availability: 1-200mm ASME Plates at Gangsteel

Our inventory covers the full 1-200mm range:

• 1-10mm: Thin sheets for cladding/liners; stock in 1500-2500mm widths, ASME SA240 compliant.
• 11-50mm: Medium for exchangers; quick-cut from coils.
• 51-100mm: Heavy for vessels; forged for uniformity.
• 101-200mm: Ultra-thick for hubs; custom-rolled with UT.

All ASME-certified, with finishes (No.1/2B/polished) and edges (mill/sheared). Stock levels: 200+ tons ready; custom within 21 days. Density 7.85 g/cm³ aids precise stocking calcs.

Heat Treatment and Fabrication: Maintaining Properties

• Annealing: 1010-1120°C, air cool—for soft machining across thicknesses.
• Quenching/Tempering: Quench from annealing, temper 565-760°C—uniform in 200mm plates.
• Welding: E410NiMo filler, 150°C preheat—PWHT for integrity in thick stock.
• Machining: Carbide tools; density consistent post-fab.

Gangsteel's tip: For 100+mm, use slow cooling to avoid density-related stresses.

Applications: Leveraging 1-200mm Stock

• Oil & Gas: 50-100mm for wellheads (ASME VIII).
• Petrochemical: 1-20mm liners (corrosion resistance).
• Marine: 30-150mm shafts (density for balance).
• Power: 100-200mm hubs (high yield).

Case: 2025, our 150mm plates for Australian boilers met ASME, reducing weight 12%.

Equivalents and Standards

Equivalents: EN 1.4313 (similar thickness range).

Standards: ASME SA240/SA240M for plates.

See asme sa240/sa240m or astm a240 /a240m.

Buying Guide: Sourcing 1-200mm ASME Plates from Gangsteel

1. Spec Your Needs: Thickness, size, ASME cert.
2. Stock Check: Immediate for standard; custom cut.
3. Pricing: $2600-2800 USD/ton FOB; thicker +$100/ton.
4. Logistics: 7-30 days; DDP global.

Gangsteel: Mill-direct, 98% on-time.

FAQ: UNS S41500 Plates and Stock Details

Q: What thicknesses are available in UNS S41500 plates under ASME stock?

A: Gangsteel stocks UNS S41500 plates from 1mm (thin sheets for precision cladding) to 200mm (heavy forgings for structural hubs), all compliant with ASME SA240/SA240M. This range covers light-duty liners (1-10mm) to pressure vessel bases (100-200mm), with widths up to 3000mm and lengths to 12000mm. Custom thicknesses within 1-200mm are available with short leads, ensuring ASME Section II traceability. Our stock is heat-treated for uniform properties, with density 7.85 g/cm³ enabling accurate weight calcs—e.g., a 50mm plate at 392.5 kg/m² for efficient design.

Q: How does ASME compliance affect UNS S41500 plate stock?

A: ASME SA240 requires UNS S41500 plates to meet strict chemistry, mechanicals, and testing (e.g., UT for defects in >50mm thick), ensuring they're suitable for pressure service. Gangsteel's 1-200mm stock includes full ASME certs, with properties like 795 MPa tensile min holding across thicknesses. Compliance adds value for ASME VIII vessels, where 200mm plates must pass impact tests at -18°C (27J min). Non-ASME stock is available cheaper, but for regulated uses, ASME ensures safety—our clients in petrochemicals report zero compliance issues.

Q: What are the key properties of UNS S41500 plates in 1-200mm range?

A: Across 1-200mm, UNS S41500 plates offer tensile 795 MPa min, yield 620 MPa min, elongation 15% min, hardness 32 HRB max, and impact 27J at -18°C. Density 7.85 g/cm³ is constant, aiding calcs (e.g., 1mm ~7.85 kg/m², 200mm ~1,570 kg/m²). Thinner (1-50mm) excel in ductility for bending, thicker (51-200mm) in strength for loads. Heat treatment uniformity is key—our plates temper without gradient issues, maintaining PREN 18-22 for corrosion.

Q: Can UNS S41500 plates in 1-200mm be used for ASME pressure vessels?

A: Yes, under ASME SA240, UNS S41500 plates 1-200mm are approved for Division 1/2 vessels, with allowable stresses up to 425°C. For 100+mm thick, additional UT and impact testing ensure integrity. Gangsteel's stock meets SA240's requirements, with low C (0.05 max) for weldability in vessel shells. Clients use 50mm plates for heads, 150mm for nozzles—density 7.85 g/cm³ helps meet weight codes. Always verify with ASME Boiler Code for specific designs.

Q: What is the density of UNS S41500 plates, and how does it vary with thickness?

A: Density is 7.85 g/cm³ across all thicknesses (1-200mm), as it's a material property unaffected by size—stemming from the Fe-rich matrix. This consistency allows linear mass scaling: 10mm plate ~78.5 kg/m², 100mm ~785 kg/m². Variations <0.1% from impurities are negligible. Gangsteel's measurements confirm this for stock, aiding in buoyancy (marine) or load (vessels) calcs—e.g., lighter than 316 (8.0 g/cm³) for 2-3% weight savings.

Q: How do I source 1-200mm UNS S41500 plates with ASME certs?

A: Gangsteel offers immediate stock in 1-200mm, ASME SA240-certified, with custom cutting. Pricing $2600-2800 USD/ton FOB; MOQ 1 ton for standard, samples available. Lead 7 days stock, 21 custom. Certs include 3.1/3.2, UT, and impact. Contact for quotes—our uns stainless steel plates include S41500 variants.

Q: What applications suit UNS S41500 plates in 1-200mm ASME stock?

A: Thin 1-20mm for cladding/exchangers (corrosion resistance), 21-100mm for vessels (strength), 101-200mm for hubs (load-bearing). ASME-compliant for boilers, reactors, marine risers. Density 7.85 g/cm³ optimizes weight—e.g., 50mm plates in offshore save 10% mass. Gangsteel's stock used in Australian boilers, meeting ASME VIII with zero failures.

Q: Are there equivalents for UNS S41500 plates in 1-200mm range?

A: Yes—EN 1.4313 for Europe (similar thickness/stock), AISI 415 legacy. Equivalents match density 7.85 g/cm³ and properties for ASME swaps. Gangsteel dual-certs S41500 to 1.4313, enabling global use—e.g., for UK projects, maintaining 1-200mm availability.