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ASTM A240 / A240M
Chromium and chromium-nickel stainless steel plate, sheet, strip
Standard specification for chromium and chromium-nickel stainless steel plate, sheet and strip.
Stainless Steel — Industrial Product
Mirror Polished Stainless Steel Plate
Austenitic 304 stainless steel plate supplied to ASTM A240, mirror polished for architectural and decorative applications.
Indicative priceUSD 1,800 - 2,400 / MT (surface premium included)
Lead time20 - 30 working days
01
Overview
Mirror Polished Stainless Steel Plate combines austenitic 304 chemistry with a high-gloss mirror polished surface for reliable corrosion resistance and a premium decorative appearance. The reflective finish, flat surface and consistent dimensional accuracy make the plate suited to architectural cladding, decorative panels, elevator interiors, signage backdrops and premium kitchen equipment. Supplied to ASTM A240 with mill test certification per EN 10204 3.1, it supports global procurement for premium architectural and design-led projects.
Key Characteristics
- 01 Corrosion Resistance Provides improved resistance to corrosive industrial environments.
- 02 Good Formability Supports bending, forming and other fabrication processes with suitable processing conditions.
- 03 Good Weldability Supports welding using suitable procedures and compatible filler materials.
- 04 Oxidation Resistance Provides resistance to oxidation and scaling at elevated temperatures.
- 05 Standard Compliance Manufactured and supplied in accordance with the specified material and product standards.
- 06 Traceable Documentation Supplied with documentation supporting material identification, chemical and mechanical traceability.
Typical Applications
- Kitchen & Catering Equipment Worktops, sinks and food-service equipment where cleanliness and environmental durability are required.
- Decorative Architecture Interior and exterior architectural finishes and decorative components requiring appearance and environmental durability.
- Chemical Processing Process piping, transfer systems and equipment for corrosive and high-purity media.
- Pressure Vessels Shell, head and nozzle components for pressure vessels designed to ASME, EN or equivalent codes.
- Storage Tanks Atmospheric and low-pressure storage tanks and related components for process facilities and bulk terminals.
- Shipbuilding Hull, structural sections and piping for commercial and naval vessels.
02
Specifications
Numbers in this section correspond to the applicable product standard, formatted for direct use in enquiry and approval documents.
Product specification
- Material
- Stainless steel
- Grade
- 304 / 1.4301 / SUS304
- UNS designation
- S30400
- Product form
- Plate / sheet
- Manufacturing method
- Hot rolled / cold rolled
- Surface / condition
- Mirror Polished
- Cross-section
- Flat rectangular section, uniform thickness
Supply specifications
- Thickness
- 0.5 - 100 mm
- Width
- 1,000 - 3,000 mm
- Length
- 2,000 - 12,000 mm
- Tolerance
- According to ASTM A480 / EN 10051
- Surface finish
- Mirror Polished
- Edge condition
- Mill edge; slit edge on request
- Marking
- Standard mill marking; customer marking on request
Final supply is confirmed against the project drawing, purchase agreement and the mill test certificate.
Chemical composition
ElementRequirement
C <= 0.08 %
Si <= 0.75 %
Mn <= 2.00 %
P <= 0.045 %
S <= 0.030 %
Cr 18.0 - 20.0 %
Ni 8.0 - 10.5 %
Fe Balance
Reference: ASTM A240 Stainless Steel.
Mechanical properties
PropertyRequirement
Tensile strength >= 515 MPa
Yield strength (0.2% offset) >= 205 MPa
Elongation in 50 mm >= 40 %
Hardness <= 201 HB / <= 92 HRB
Reference: ASTM A240 Stainless Steel at room temperature.
Physical properties
PropertyTypical Value
Density 8.0 g/cm³
Elastic modulus 193 GPa
Thermal conductivity 16.3 W/m·K at 100°C
Electrical resistivity 0.74 μΩ·m
Specific heat 500 J/kg·K
Melting range 1,400 - 1,450 °C
Thermal expansion 17.0 x 10⁻⁶ /°C
Reference: Typical material values, Stainless Steel.
Reference framework
Standards & documentation
The applicable product, dimensional and inspection standards should be confirmed together in the purchase specification.
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ASME SA240
ASME pressure vessel reference
ASME counterpart of ASTM A240 for pressure vessel and high-temperature applications.
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EN 10088-2
Stainless steel flat products
European reference for stainless steel flat products for general purposes.
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JIS G4304
Hot-rolled stainless steel plate, sheet and strip
Japanese reference for hot-rolled stainless steel plate, sheet and strip.
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JIS G4305
Cold-rolled stainless steel plate, sheet and strip
Japanese reference for cold-rolled stainless steel plate, sheet and strip.
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EN 10204
Inspection documents
Defines inspection document types such as 3.1 and 3.2 for metallic product delivery.
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Capability
From custom dimensions and precision sizing to heat treatment, surface finishing and product-specific processing, Wayland coordinates supply solutions tailored to your requirements.
Cutting
Cut-to-length and custom cutting according to order requirements.
Custom Dimensions
Non-standard dimensions, tolerances and dimensional combinations subject to product and mill capability.
Precision Sizing
Precision sizing and dimensional control for tighter tolerance requirements.
Cold Working
Cold drawing, cold sizing and other cold-working processes where required.
Heat Treatment
Heat treatment according to material, specification and applicable standard.
Surface Finishing
Surface treatment and finishing according to product, specification and application requirements.
Forming
Bending, forming and other shape modification according to drawings or order requirements.
Machining
Turning, drilling, milling and other machining operations where required.
Customization
Custom dimensions, lengths, surface conditions, end preparations and inspection requirements can be supplied according to project specifications. Final capability is confirmed per enquiry based on grade, size range and applicable standard.
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Quality
Inspection and documentation procedures are coordinated to meet the requirements of the applicable product standard and the project specification.
- Dimensional inspection Geometry, dimensions and tolerances against the applicable standard
- Visual and surface inspection Surface condition, marking and overall appearance
Documents
- Inspection Report
- Chemical analysis Per heat, against the applicable standard
- Mechanical testing Tensile, yield, elongation and hardness
- Non-destructive testing UT, eddy-current, hydrostatic or other NDT as applicable
- Positive material identification PMI for alloy verification when required
Documents
- Mill Test Certificate (MTC)
- Heat number traceability Heat number carried through MTC and product marking
- Third-party inspection coordination SGS / BV / TÜV on request
Documents
- Third-Party Inspection Report
- EN 10204 documentation 3.1 MTC standard; 3.2 on request
Documents
- EN 10204 3.1 Mill Test Certificate
- EN 10204 3.2 Inspection Certificate
- Certificate of Origin
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Selection
A well-prepared specification is the most efficient defence against clarification cycles.
- 01 Select material & grade
Choose the material grade according to service conditions, performance requirements and applicable standards.
- 02 Define size & supply condition
Specify the required dimensions, surface condition, heat-treatment condition and delivery requirements.
- 03 Confirm standard & requirements
State the applicable product standard, dimensional standard and governing project specification.
- 04 Define inspection & documentation
Confirm inspection, testing, certification and documentation requirements before order placement.
Example procurement specification
A complete specification suitable for enquiry, covering product, technical requirements, certification and delivery terms.
- Product
- Mirror Polished Stainless Steel Plate
- Grade
- 304
- Standard
- ASTM A240
- Dimensions
- Thickness 2.0 mm × Width 1219 mm × Length 2438 mm (BA / Mirror)
- Condition
- BA / No.4 / Matte Finish; PVC Film Protection
- Certification
- EN 10204 3.1 Mill Test Certificate
- Quantity
- 20 Metric Tons
- Packaging
- Seaworthy Export Packing
- Incoterm
- CIF Hamburg
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Logistics
From mill dispatch to destination port, each stage is coordinated with the nominated forwarder and documented against the purchase specification.
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Packaging
Export-suitable packaging with surface and edge protection.
Bundled, wrapped or crated according to product form and transport mode. Outer surface protected with weather-resistant material; ends and edges shielded against transit damage.
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Loading
FCL container for standard sizes; break bulk for oversized cargo.
Container loading via nominated forwarder. LCL and dimensions outside container allowance coordinated against the mill dispatch schedule.
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Documentation
Commercial invoice, packing list and certificate of origin.
Mill documentation travels with the shipment. EN 10204 3.1 / 3.2 certificates and third-party inspection reports provided as per purchase specification.
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Shipment
Sea freight as standard; alternative routes on request.
FCL / LCL container shipment or break bulk for oversized dimensions. Logistics coordinated through the nominated forwarder.
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Delivery
FOB · CFR · CIF · FCA · EXW arrangements available.
Incoterm 2020. Port of loading: Shanghai / Ningbo / Shenzhen. Final destination and terms confirmed per enquiry.
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FAQ
Most enquiries reduce to a small set of recurring technical questions.
01 What is mirror polished stainless plate?
Mirror polished stainless plate (No.8 / 8K finish) is produced by successive grinding and buffing using progressively finer abrasives. The final surface is highly reflective with Ra < 0.1 μm.
02 What are typical applications?
Mirror plate is widely used for elevator panels, architectural cladding, decorative panels, kitchen and food service equipment, and signage.
03 What protection is applied for shipment?
PE / PVC laser film protects the polished face. Foam interleaving separates plates. Wooden crate packaging is standard for export.
04 What thicknesses are available?
Mirror polished plate is typically 0.5 - 6 mm. Heavier gauges can be supplied on request.
05 Can mirror plate be formed?
Mirror polish is a surface treatment. Formability follows the base grade. Heavy forming may distort the mirror finish.