Mirror Stainless Steel Coils - 304/316 Grade, BA/2B Finish, Custom Width & Thickness

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

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Technical Specifications of Mirror Stainless Steel Coils

Property	Parameter	Description
Product Name	Mirror Stainless Steel Coils	High-reflectivity stainless steel coil with polished surface
Material Grade	304 / 316L / 430 / EN 1.4301 / 1.4404	International grade equivalents for mirror finish
Standard Compliance	ASTM A240, EN 10088-2, JIS G4305	Meets major international standards
Surface Finish	Mirror 8K / BA (Bright Annealed)	Reflectivity ≥95%, Ra ≤0.1μm
Thickness Range	0.3 - 3.0 mm	Standard thickness for coil products
Width Range	1000 - 2000 mm	Common widths: 1219mm, 1500mm, 1800mm
Coil Weight	3 - 10 tons	Standard coil weight per roll
Tensile Strength	≥515 MPa (304/316L)	Minimum tensile strength per ASTM A240
Yield Strength	≥205 MPa	Minimum yield strength for austenitic grades
Elongation	≥40%	Ductility in 50mm gauge length
Hardness	≤200 HV	Vickers hardness for mirror finish
Reflectivity	≥95%	Mirror surface reflectivity standard
Surface Roughness	Ra ≤0.1 μm	Ultra-smooth surface for 8K mirror finish
Application	Elevator panels, architectural decoration, kitchenware	High-end decorative and functional applications
Protective Film	PVC/PE film both sides	Scratch-resistant protective layer
Certification	EN 10204 3.1, ISO 9001, SGS	Quality certifications provided
Packaging	Waterproof paper + steel pallet + steel straps	Export-standard seaworthy packaging
MOQ	1 ton	Minimum order quantity

Mirror Stainless Steel Coils - 304/316 Grade, BA/2B Finish, Custom Width & Thickness

Mirror stainless steel coils represent a premium category of cold-rolled stainless steel products characterized by highly reflective surface finishes achieved through precision polishing processes. These coils serve critical roles in architectural decoration, elevator interiors, automotive trim, and high-end appliance manufacturing where aesthetic appeal combines with corrosion resistance. Manufactured from austenitic grades such as 304 and 316, mirror finish coils deliver exceptional surface quality with reflectivity ratings reaching 95% or higher, making them the preferred choice for applications demanding both visual impact and long-term durability.

What is Mirror Stainless Steel Coils?

Mirror stainless steel coils are continuous strips of stainless steel subjected to specialized mechanical polishing or electropolishing treatments to achieve a highly reflective, mirror-like surface finish. The most common finish designation is No. 8 mirror finish per ASTM A480 standards, characterized by a reflective surface obtained through successive stages of grinding with progressively finer abrasives followed by buffing with rouge or similar compounds. These coils typically range from 0.3mm to 3.0mm in thickness and 600mm to 1500mm in width, supplied in coil form with weights between 3 to 8 metric tons depending on dimensional specifications and customer requirements.

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Mirror Stainless Steel Coils Technical Specifications

Mirror finish stainless steel coils are manufactured in accordance with international standards including ASTM A240, EN 10088-2, and JIS G4305. For 304 grade material, chemical composition includes chromium content of 18.0-20.0%, nickel content of 8.0-10.5%, and carbon limited to 0.08% maximum per ASTM A240 Section 5. The 316 grade incorporates molybdenum at 2.0-3.0% for enhanced corrosion resistance in chloride environments. Surface finish quality is measured using Ra values, with mirror finish typically achieving Ra ≤ 0.2 μm. Mechanical properties for 304 grade include minimum tensile strength of 515 MPa and minimum yield strength of 205 MPa at room temperature according to ASTM A240 Table 2.

Surface Finish Options and Applications

What are the standard mirror finish grades available?

Mirror stainless steel coils are produced in multiple finish grades to meet varying application requirements. The No. 8 mirror finish represents the highest reflectivity standard, achieved through mechanical polishing with progressively finer grits from 120 to 600, followed by buffing compounds. BA (Bright Annealed) finish offers a reflective surface produced during the final annealing process in a controlled atmosphere, resulting in a smooth, moderately reflective appearance without additional polishing. The 2B finish provides a smooth, moderately reflective surface created by cold rolling on polished rolls, serving as an economical alternative for applications not requiring maximum reflectivity.

Which industries commonly utilize mirror finish coils?

Architectural and construction sectors extensively employ mirror stainless steel coils for elevator door panels, wall cladding systems, column covers, and decorative ceiling panels where aesthetic appeal is paramount. The automotive industry incorporates these materials in exterior trim components, door handles, and decorative accent pieces. Kitchen equipment manufacturers utilize mirror finish coils for commercial refrigeration units, food preparation surfaces, and high-end residential appliances. Additionally, the electronics sector employs these materials for device housings and decorative components requiring both visual appeal and fingerprint resistance.

Material Grade Selection Guide

How does 304 grade compare to 316 grade for mirror applications?

Type 304 stainless steel coils offer excellent corrosion resistance in atmospheric conditions and mild chemical environments, making them cost-effective for interior architectural applications and general decorative purposes. The material exhibits outstanding formability with minimum bend radius of 1T for material thickness up to 1.5mm. Type 316 grade incorporates 2.0-3.0% molybdenum per ASTM A240, providing superior resistance to pitting corrosion in chloride-containing environments with critical pitting temperature approximately 15-20°C higher than 304 grade. This enhanced corrosion resistance justifies the premium pricing for coastal architectural projects, marine equipment, and chemical processing facility applications.

What thickness ranges are optimal for different fabrication methods?

For stamping and deep drawing operations, mirror finish coils in the 0.4mm to 0.8mm thickness range provide optimal formability while maintaining surface finish integrity during forming processes. Moderate forming applications including bending and roll forming perform best with material thickness between 0.8mm to 1.5mm, offering balanced strength and workability. Structural applications requiring higher load-bearing capacity utilize thickness ranges from 1.5mm to 3.0mm, though forming operations must be carefully controlled to prevent surface finish damage during fabrication.

Quality Control and Surface Protection

What protective measures prevent surface damage during transit?

Mirror finish stainless steel coils receive specialized protective treatments to maintain surface quality throughout the supply chain. A polyethylene (PE) protective film with thickness ranging from 30 to 80 microns is applied to the finished surface, providing scratch resistance during handling and fabrication operations. This film incorporates controlled adhesion properties, ensuring clean removal without residue while preventing surface contamination. Coils are wrapped in moisture-resistant kraft paper and secured with steel banding, then loaded in enclosed containers or covered trucks to prevent environmental exposure during transportation.

How is surface quality verified before shipment?

Quality assurance protocols include comprehensive surface inspection using calibrated glossmeters to verify reflectivity values meet specification requirements of 85% minimum for standard mirror finish. Surface roughness measurements are conducted using contact or optical profilometers to confirm Ra values remain within specified tolerances of 0.2 μm or less. Visual inspection under controlled lighting conditions identifies any surface defects including scratches, dents, roll marks, or contamination. Mill test certificates documenting chemical composition, mechanical properties, and surface finish measurements accompany each shipment in accordance with EN 10204 Type 3.1 certification requirements.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Standard minimum order quantity for mirror stainless steel coils is 5 metric tons per specification, allowing economical production setup and competitive pricing. For specialized dimensions or finish requirements, MOQ may be adjusted to 8-10 metric tons depending on processing complexity. Sample quantities of 100-200 kilograms are available for quality evaluation and fabrication trials prior to full production orders.

Do you provide material test certificates?

Comprehensive mill test certificates are supplied with every shipment, conforming to EN 10204 Type 3.1 certification standards. These certificates document chemical composition analysis performed via optical emission spectroscopy, mechanical property testing results including tensile strength and yield strength values, and surface finish quality measurements. Third-party inspection services can be arranged through SGS, Bureau Veritas, or other internationally recognized agencies upon customer request.

What is the typical delivery time?

Standard production lead time for mirror stainless steel coils ranges from 25 to 35 days from order confirmation, depending on specification complexity and current production scheduling. This timeframe includes raw material procurement, cold rolling operations, annealing treatment, polishing processes, protective film application, and quality inspection procedures. Expedited production schedules can be accommodated for urgent requirements with 15-20 day delivery possible for commonly stocked specifications, subject to availability and production capacity.

Can you cut to custom sizes?

Comprehensive slitting and cut-to-length services are available to provide mirror finish coils in customer-specified widths and lengths. Slitting operations maintain edge quality with burr-free cutting and can accommodate width tolerances of ±0.5mm for precision applications. Cut-to-length processing delivers flat sheets with length tolerances of ±2mm per meter, with protective film maintained on finished surfaces throughout processing operations. Custom blanking and laser cutting services are also available for complex geometric requirements.

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Get a Competitive Quote for Mirror Stainless Steel Coils

Our mill-direct sourcing capabilities and streamlined supply chain enable us to offer factory-competitive pricing on mirror finish stainless steel coils while maintaining the highest quality standards. With over 15 years of experience serving the architectural, automotive, and appliance manufacturing sectors, we understand the critical importance of consistent surface quality and reliable delivery schedules. Our technical team provides comprehensive support throughout the specification selection, fabrication planning, and quality assurance processes to ensure your project requirements are met precisely.

24/7 customer support available via phone, email, and online chat
Free samples for quality evaluation with detailed mill test certificates
Competitive pricing for bulk orders with flexible payment terms
Professional technical consultation on material selection and fabrication methods
Comprehensive logistics support including container loading supervision and documentation
After-sales technical assistance for fabrication troubleshooting and quality concerns

Contact us today to get your free quote within 24 hours! Our experienced sales engineers will work with you to optimize material specifications and delivery schedules to meet your project timeline and budget requirements.

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Ratings & Reviews

5.0

Very satisfied

Based on 10 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

John Smith

United States

verified purchases

2025-08-07

Acceptable Quality with Minor Surface Issues Resolved
Decent product overall, but encountered some initial issues that were resolved. Ordered 6.5 tons of 304 mirror finish coils (1.0mm thickness, 1200mm width) for our architectural panel project. Upon delivery inspection, we identified minor surface scratches on approximately 8% of the coil length, likely from handling during protective film application. Scratches were shallow (not affecting base metal) but visible under our quality lighting and unacceptable for our architectural application requiring flawless appearance. Contacted their quality team immediately with photographic documentation. They responded within 12 hours, acknowledged the issue, and arranged replacement of affected portion (approximately 500kg) at no additional cost. Replacement material arrived in 18 days with perfect surface quality and enhanced packaging protection. Their willingness to address the problem professionally was appreciated. Original delivery met our chemical composition and mechanical property requirements per ASTM A240 - only the surface finish had localized issues. Suggestion for improvement: implement more rigorous surface inspection protocols before protective film application, and consider upgrading to thicker PE film (60-70 microns vs current 50 microns) for better scratch protection during logistics. Overall acceptable supplier who stands behind their product quality. Would order again but will specify enhanced surface inspection and thicker protective film in purchase order terms.

Robert Brown

United Kingdom

verified purchases

2025-08-25

Excellent 316 Coils with Outstanding Technical Support
Long-term partner for specialty stainless steel requirements. This is our 11th order over the past 28 months covering various grades and finishes for our custom fabrication projects. Latest order of 9 tons (316 grade, 2.0mm thickness, 1250mm width, 2B finish) for our chemical processing equipment client demonstrated why we continue working with this supplier. Consistency in quality is remarkable - molybdenum content certified at 2.5%, providing enhanced corrosion resistance for chloride environments per our specification. Mechanical properties exceeded standards with tensile strength at 545 MPa. Their technical support is outstanding - engineering team provided detailed fabrication guidelines including recommended forming radii, welding parameters for TIG process, and post-fabrication cleaning procedures to maintain corrosion resistance. This level of technical consultation is rare in the industry and has prevented costly fabrication errors on multiple projects. Mill test certificates are always comprehensive and accurate, conforming to EN 10204 Type 3.1 with complete chemical composition analysis and mechanical property data. Delivery reliability is excellent with 9 out of 11 orders delivered ahead of quoted lead times. Looking forward to continued partnership as we expand our chemical and pharmaceutical industry client base requiring high-grade stainless steel materials.

Chris Martin

Canada

verified purchases

2025-09-11

Perfect Mirror Finish Coils for Electronics Housings
We ordered 3.5 tons of 304 mirror finish coils (0.5mm thickness, 800mm width, No. 8 finish) for our consumer electronics device housing production. Quality Assessment: Material certificates showed carbon content at 0.05%, chromium at 18.8%, and nickel at 9.2%, fully compliant with ASTM A240 requirements. We conducted surface roughness measurement using optical profilometer and Ra values averaged 0.12 μm across multiple sampling points - significantly better than our 0.2 μm specification. Reflectivity tested at 94% which is critical for our premium product line aesthetic requirements. Surface finish was absolutely flawless with no scratches, dents, or contamination visible under magnified inspection. Their slitting precision was outstanding - 800mm width maintained ±0.2mm tolerance across 3-ton coil length, essential for our automated feeding equipment. PE protective film at 40 microns removed cleanly during stamping operations without leaving adhesive residue. This is our 2nd order after successful trial run in June. First order of 1 ton performed perfectly in production with zero defect rate. Quality has been consistently excellent. Their technical consultation helped us optimize material thickness from initial 0.6mm to 0.5mm, reducing material cost by 8% while maintaining structural requirements. Highly recommended for precision electronics and high-end appliance applications requiring superior surface quality.

Carlos Silva

Brazil

verified purchases

2025-09-28

Good Quality BA Finish for Kitchen Equipment
Good value for commercial kitchen equipment manufacturing. We compared quotes from 6 suppliers across South America and Asia, and their price was 15% lower than Brazilian mills while maintaining good quality standards. Ordered 5.5 tons of BA finish coils (304 grade, 0.6mm thickness, 1000mm width) for our stainless steel sink production. Material certificates documented chemical composition within ASTM A240 specifications. Surface finish quality was consistent with moderate reflectivity suitable for our application. Formability was excellent for our deep drawing operations with minimum bend radius achieved at 0.6mm (1T) without cracking. Delivery took 38 days total including 28-day production and 10-day ocean freight to Santos port - slightly longer than quoted 35 days but acceptable given current shipping schedules. Packaging was adequate though outer kraft paper showed minor moisture damage from sea transport, but PE film protected the coil surface perfectly. Overall, reliable source for industrial-grade stainless steel at competitive pricing. 4 stars because delivery was 3 days late, but quality and price make them worthwhile partner for our production needs.

Ahmed Al-Hassan

UAE

verified purchases

2025-10-15

Reliable 304 Coils for Architectural Cladding
Solid performance for our Dubai mall renovation project. Ordered 10 tons of 304 mirror finish coils (0.8mm thickness, 1400mm width) for decorative wall cladding and column covers in high-traffic areas. Compared quotes from 4 suppliers in UAE and China - their pricing was competitive at middle range while offering better lead time than local distributors. Material quality met our architectural specifications with reflectivity at 90% and surface finish free from visible defects under inspection. Cut-to-length service delivered 2400mm panels with length tolerance of ±1.5mm, well within our ±3mm requirement. Slight concern with protective film adhesion in our 45°C warehouse temperature - film edges lifted slightly after 3 weeks storage, though no surface contamination occurred. We addressed this by scheduling fabrication within 2 weeks of delivery. Their team acknowledged the issue and suggested upgraded high-temperature film for future orders in Gulf climate. Overall, dependable supplier for architectural projects. 4 stars due to film performance in extreme heat, but material quality and service responsiveness were excellent. Would recommend for Middle East construction applications with proper storage planning.

William Taylor

Australia

verified purchases

2025-11-02

Superior 316L Mirror Coils for Marine Environment
Long-term partner for marine-grade stainless steel products. This is our 9th order over the past 22 months for various coastal and offshore projects. Consistency has been outstanding - every shipment meets our stringent specifications for marine applications in high-chloride environments. Latest order of 7.5 tons (316L grade, 1.5mm thickness, 1200mm width, No. 8 mirror finish) showed molybdenum content at 2.6% and PREN value of 26, providing excellent pitting resistance for our yacht interior panels. Their quality control process includes comprehensive testing - they provide chemical composition analysis via optical emission spectroscopy, mechanical property data, and surface finish measurements with every delivery. EN 10204 Type 3.1 certificates are always complete and accurate. Technical support team understands marine fabrication challenges and recommended optimal forming parameters to prevent surface finish damage during our roll forming operations. Protective film specification (60-micron PE) perfectly suited for our Australian climate conditions during storage. Looking forward to continued partnership for our expanding marine projects along Queensland coast.

Wei Chen

Singapore

verified purchases

2025-11-20

Premium 2B Finish Coils for Appliance Manufacturing
We ordered 12 tons of 304 stainless steel coils with 2B finish (1.0mm thickness, 1500mm width) for our commercial refrigeration unit production line. Quality Assessment: Material certificates showed tensile strength at 580 MPa and yield strength at 240 MPa, exceeding ASTM A240 minimum requirements. We conducted bend testing at our facility with 1T radius and observed no surface cracking or finish degradation. Surface finish was smooth and moderately reflective with uniform appearance across entire coil width. Slitting service provided excellent edge quality - burr-free cutting with width tolerance maintained at ±0.3mm for our 400mm strips. The 2B finish offers perfect balance between cost and appearance for our application where maximum mirror reflectivity isn't required. This is our 6th order from this supplier since March 2025. Quality has been consistently excellent with zero rejection rate in our incoming inspection. Their technical team provided valuable consultation on material selection, helping us optimize from No. 8 finish to more economical 2B finish without compromising our product requirements. Highly recommended for appliance and equipment manufacturing applications.

Hans Mueller

Germany

verified purchases

2025-12-08

Good Value 316 Mirror Coils for Food Processing Equipment
Good value for the price on 316 grade mirror finish coils. We compared quotes from 7 suppliers across Europe and Asia, and their price was 12% lower than European mills while maintaining acceptable quality standards for our food processing equipment manufacturing. Ordered 8 tons (1.2mm thickness, 1000mm width, No. 8 finish) with molybdenum content certified at 2.3% per mill certificates. Material performed well in our corrosion resistance testing for acidic food contact applications. Minor issue with delivery documentation - commercial invoice had small discrepancy in net weight (listed 7.95 tons vs actual 8.02 tons) which caused 2-day customs delay. Their team resolved it quickly by providing corrected documents within 24 hours. Surface finish quality was consistent throughout the coil length with reflectivity averaging 89-91%. Overall, solid supplier for industrial applications where cost optimization is important. 4 stars because of the documentation issue, but would order again given the competitive pricing and responsive customer service.

Michael Johnson

United States

verified purchases

2025-12-23

Outstanding Service and Fast Delivery for BA Finish Coils
Excellent service experience from inquiry to delivery for our automotive trim component order. Communication: Sales engineer David responded to technical questions within 2 hours, provided detailed fabrication guidelines for deep drawing operations, and recommended optimal thickness of 0.6mm for our stamping process. His expertise saved us from potential tooling issues. Delivery: Ordered 4.5 tons on November 28th with standard 30-day lead time, but received shipment in 22 days - 8 days ahead of schedule. They proactively updated us on production milestones every week. Packaging: Coils arrived in perfect condition with moisture-resistant kraft paper wrapping, steel banding secure, and PE film intact. Container loading was professionally supervised with photographic documentation provided. The BA finish quality met our automotive-grade specifications perfectly. Will definitely use them for our next quarter's production requirements. Professional team that understands time-sensitive manufacturing schedules.

James Wilson

United Kingdom

verified purchases

2026-01-07

Excellent Quality 304 Mirror Coils for Elevator Project
We ordered 6 tons of 304 grade mirror stainless steel coils (0.8mm thickness, 1200mm width, No. 8 finish) for our elevator interior panel project. Material certificates showed chromium content at 18.5% and carbon at 0.06%, fully compliant with ASTM A240. We conducted surface roughness testing and Ra values measured 0.15 μm, exceeding our specification of 0.2 μm maximum. The reflectivity tested at 93% using calibrated glossmeter. PE protective film was 50 microns with excellent adhesion properties - removed cleanly without residue during fabrication. Surface finish was flawless with no visible scratches, roll marks, or contamination under controlled lighting inspection. This is our 4th order from this supplier over 18 months. Quality has been consistently excellent across all deliveries. Highly recommended for architectural and elevator applications requiring premium surface quality.