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Polished Stainless Steel Coil – No.4, Hairline & Satin Finishes
Xi'an Dongmeng Group Co., Ltd. is a manufacturer and exporter of stainless steel products serving international distributors, architectural fabricators, OEM manufacturers and industrial buyers. We supply polished stainless steel coils in grades including 304, 304L, 316, 316L and 430, with mechanically finished surfaces for decorative, architectural and industrial manufacturing applications.
Our polished stainless steel coil products are available with No.4, hairline (HL), satin and customized directional finishes. Buyers can specify surface appearance, sheet thickness, coil width, polishing direction, protective film and coil packaging according to their manufacturing requirements.
Material selection and finishing requirements can be reviewed against ASTM A240/A240M, ASTM A480/A480M and EN 10088-2, as applicable.
Request a Quote | Submit Your Specifications | Request Surface Samples | Ask for MTC & Inspection Documents
What Is Polished Stainless Steel Coil?
Polished stainless steel coil is a continuous flat-rolled stainless steel product that has undergone mechanical surface finishing to achieve a specified appearance, texture and surface quality.
The polishing process normally involves abrasive belts, brushes or non-metallic polishing media. Depending on the selected process, the finished surface may have a uniform linear grain, a satin appearance or another defined decorative texture.
Unlike an ordinary mill-finished coil, polished stainless steel is produced to satisfy additional surface appearance requirements.
However, polishing does not change the underlying stainless steel grade. Corrosion resistance, mechanical strength, forming behavior and suitability for a particular environment continue to depend primarily on material composition, metallurgical condition, surface quality and operating conditions.
For projects requiring highly reflective surfaces, a separate No.8 mirror-polished product may be more appropriate.
Available Polished Stainless Steel Surface Finishes
No.4 Polished Stainless Steel Coil
No.4 is a general-purpose polished finish featuring a directional, finely textured appearance.
It is widely specified for stainless steel surfaces requiring an attractive finish without the high reflectivity of mirror polishing.
Surface Characteristics
Uniform directional polishing marks
Moderate reflectivity
General-purpose decorative appearance
Surface texture suitable for agreed cleaning and maintenance procedures
Typical Applications
Commercial kitchen equipment, elevator interiors, appliance panels, architectural trim and industrial equipment covers.
Hairline (HL) Stainless Steel Coil
Hairline stainless steel features long, fine and continuous polishing lines.
This surface is particularly suitable for architectural applications where consistent directional appearance is important.
Surface Characteristics
Fine longitudinal polishing texture
Continuous linear grain
Controlled decorative appearance
Suitable for appearance-sensitive fabrication
Typical Applications
Elevator cabins, wall cladding, column covers, decorative panels, retail interiors and architectural profiles.
Hairline appearance should be approved using reference samples because the term alone does not establish a universal roughness or gloss requirement.
Satin Polished Stainless Steel Coil
Satin polishing produces a comparatively soft, low-glare finish.
Depending on the specified processing route, it may be produced with controlled mechanical polishing and a finer surface texture.
Surface Characteristics
Low-glare decorative appearance
Fine, relatively uniform surface texture
Reduced visual reflectivity compared with mirror finishes
Project-specific roughness and appearance requirements
Typical Applications
Architectural cladding, equipment housings, decorative fabrication and selected exposed stainless steel components.
For applications requiring EN 10088-2 finish 2K, the specified roughness requirement must be confirmed according to the applicable standard and purchase order.
Customized Fine Brushed Finish
Fine brushed stainless steel coils can be processed to an agreed surface texture based on approved reference samples.
Buyers may specify polishing direction, texture density, grain appearance, protective film and inspection conditions.
The final surface should be evaluated using consistent lighting, viewing distance and mutually agreed acceptance criteria.
Polished Stainless Steel Coil Surface Finish Comparison
| Surface Finish | Typical Appearance | Relative Reflectivity | Common Applications |
| No.4 | Fine directional grain | Medium | Kitchens, appliances, interior panels |
| Hairline (HL) | Long continuous lines | Low to medium | Elevators, architectural cladding |
| Satin | Fine low-glare texture | Low to medium | Decorative and architectural components |
| Fine Brushed | Customized linear pattern | Variable | OEM components and decorative profiles |
| No.8 Mirror | Highly reflective surface | High | Premium reflective architectural finishes |
Important: 2B and BA are mill surface finishes rather than equivalent names for mechanically polished No.4 or hairline surfaces. They may serve as starting substrates for subsequent finishing.
Finish designation, visual appearance, surface roughness and production route should be specified separately where critical.
Stainless Steel Grades for Polished Coils
The correct stainless steel grade should be selected according to corrosion exposure, fabrication requirements, mechanical properties and project budget.
304 Stainless Steel Polished Coil
304 stainless steel is a general-purpose austenitic grade widely used for decorative and industrial fabrication.
It provides a practical balance of corrosion resistance, formability, weldability and surface finishing capability.
Recommended Applications: Architectural panels, indoor decorative components, kitchen equipment and general-purpose fabrication.
304L Stainless Steel Polished Coil
304L offers a lower maximum carbon content than standard 304, making it useful for welded fabrications where resistance to sensitization is important.
Recommended Applications: Welded equipment components, fabricated architectural assemblies and industrial panels.
316 / 316L Stainless Steel Polished Coil
316 and 316L contain molybdenum, which generally improves resistance to localized corrosion compared with 304 in many chloride-containing environments.
316L is often selected where low carbon content is desirable for welded fabrication.
Recommended Applications: Selected coastal architectural components, chemical processing equipment and more demanding corrosion environments.
Suitability must be evaluated against chloride concentration, temperature, cleaning chemicals, crevice conditions and required service life.
430 Stainless Steel Polished Coil
430 is a ferritic stainless steel commonly used where decorative appearance and moderate corrosion resistance are required.
It is an alternative to nickel-containing austenitic grades for suitable indoor applications.
Recommended Applications: Appliance components, interior decorative panels, equipment covers and general fabrication.
201 Stainless Steel Polished Coil
201 stainless steel may be considered for cost-sensitive decorative applications in controlled, relatively low-corrosion environments.
Its chemistry and corrosion performance differ from 304 and 316L, and grade selection should not be based on appearance alone.
Recommended Applications: Selected indoor decorative components and light-duty applications where exposure conditions permit.
Stainless Steel Grade Selection Guide
| Grade | Material Family | Key Consideration | Typical Selection |
| 201 | Austenitic | Lower-alloy decorative option | Controlled indoor environments |
| 304 | Austenitic | Balanced corrosion resistance and fabrication | General architectural and industrial |
| 304L | Austenitic | Low-carbon welding grade | Welded fabrication |
| 316 | Austenitic | Molybdenum-alloyed corrosion resistance | More demanding environments |
| 316L | Austenitic | Low carbon and molybdenum | Welded and corrosion-sensitive projects |
| 430 | Ferritic | Nickel-free alloy design | Selected indoor decorative applications |
The final grade must be approved against the actual service environment and applicable design requirements.
Chemical Composition of Common Polished Stainless Steel Grades
The following values summarize selected principal alloying elements for commonly specified stainless steel grades. The complete chemical composition, including residual-element limits, must comply with the applicable material specification.
| Grade | C Max. (%) | Cr (%) | Ni (%) | Mo (%) |
| 304 | 0.08 | 18.0–20.0 | 8.0–10.5 | - |
| 304L | 0.03 | 18.0–20.0 | 8.0–12.0 | - |
| 316 | 0.08 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 316L | 0.03 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 430 | 0.12 | 16.0–18.0 | Not specified as a required alloying range | - |
Values are representative ASTM grade limits. Chemical composition must be verified against the specified standard edition and actual material test certificate.
Mechanical Properties of Polished Stainless Steel Coil
Mechanical properties are determined primarily by the material grade, rolling history, heat treatment and delivery condition rather than by the polishing appearance.
The table below presents commonly referenced minimum properties for selected annealed stainless steel grades under ASTM A240/A240M.
| Grade | Tensile Strength Min. (MPa) | 0.2% Yield Strength Min. (MPa) | Elongation Min. (%) |
| 304 | 515 | 205 | 40 |
| 304L | 485 | 170 | 40 |
| 316 | 515 | 205 | 40 |
| 316L | 485 | 170 | 40 |
| 430 | 450 | 205 | 22 |
Actual acceptance requirements may depend on the product form, thickness, condition and applicable specification edition.
Cold-worked or specially tempered products require separate mechanical-property confirmation.
Physical Properties
Typical reference values for common stainless steel grades are shown below.
| Property | 304 | 316L | 430 |
| Density | Approx. 7.93 g/cm³ | Approx. 7.99 g/cm³ | Approx. 7.70 g/cm³ |
| Metallurgical Structure | Austenitic | Austenitic | Ferritic |
| Magnetic Behavior | Generally low magnetic response when annealed | Generally low magnetic response when annealed | Magnetic |
| General Formability | Good | Good | Grade- and process-dependent |
| General Weldability | Good with suitable procedure | Good with suitable procedure | Requires grade-specific procedure control |
These are general reference characteristics, not certified lot-specific values.
Polished Stainless Steel Coil Size Range
| Thickness (mm) | Thickness (in) | Common Width Options (mm) |
| 0.3 | 0.0118 | 1000 / 1219 / 1500 |
| 0.4 | 0.0157 | 1000 / 1219 / 1500 |
| 0.5 | 0.0197 | 1000 / 1219 / 1500 |
| 0.6 | 0.0236 | 1000 / 1219 / 1500 |
| 0.8 | 0.0315 | 1000 / 1219 / 1500 |
| 1 | 0.0394 | 1000 / 1219 / 1500 |
| 1.2 | 0.0472 | 1000 / 1219 / 1500 |
| 1.5 | 0.0591 | 1000 / 1219 / 1500 |
| 2 | 0.0787 | 1000 / 1219 / 1500 |
| 2.5 | 0.0984 | 1000 / 1219 / 1500 |
| 3 | 0.1181 | 1000 / 1219 / 1500 |
This table is a dimensional inquiry guide, not a commitment that every thickness, width, grade and finish combination is available.
Other dimensions and narrow slit-coil requirements may be reviewed separately.
Dimensional Tolerances
Thickness, width, flatness, edge condition and other dimensional tolerances should be specified according to the relevant product standard.
Polishing may affect the final surface condition and, depending on the process, material thickness.
For projects with strict tolerances, buyers should confirm whether the specified thickness refers to the incoming substrate or the finished polished product.
Coil ID, OD and Weight
The coil inner diameter, maximum outer diameter and maximum coil weight should be selected according to the customer's decoiling equipment and material-handling capacity.
Common coil inner diameters include 508 mm and 610 mm.
Coil weight and outer diameter depend on thickness, width, length, packing configuration and production limitations.
Polishing Process and Surface Quality Control
A typical polished stainless steel coil processing route includes:
1. Material Verification
Confirm stainless steel grade, material certificate, substrate thickness and initial surface condition.
2. Incoming Surface Inspection
Check for defects that may affect the final appearance, including deep scratches, pits, dents and contamination.
3. Surface Preparation
Clean and prepare the substrate as required for the selected finishing process.
4. Mechanical Polishing
Apply the approved abrasive belt or brushing process to obtain the required surface texture.
5. Finish Consistency Control
Monitor polishing direction, grain uniformity, surface appearance and processing-related defects.
6. Surface Inspection
Evaluate visual appearance and specified surface roughness according to the approved inspection method.
7. Protective Film Application
Apply compatible protective film where required to reduce damage during handling and fabrication.
8. Recoiling and Packaging
Control coil winding, edge protection and packaging to reduce surface damage during transport.
The actual processing route depends on the approved finish and production arrangement.
Surface Roughness and Polishing Quality Requirements
Surface roughness is an important parameter for applications involving specified appearance, cleanability or controlled surface texture.
A finish designation such as No.4 or Hairline does not automatically establish a unique surface roughness value.
For reference, No.4 finishes are commonly reported with Ra values around 0.18–0.64 μm, although actual values vary according to processing and measurement conditions.
For EN 10088-2 satin-polished 2K finishes, the applicable transverse surface roughness requirement should be checked against the specified standard.
Recommended Surface Acceptance Criteria
For appearance-sensitive orders, the purchase specification should establish:
Approved surface reference sample
Finish designation and polishing direction
Permitted surface roughness range
Gloss or reflectivity requirements, where necessary
Acceptable visual variation
Inspection lighting and viewing conditions
Inspection side: one side or both sides
Protective film requirements
Permitted defects and rejection criteria
For directional finishes, the measurement direction and evaluation method must be agreed before production.
Abrasive grit numbers alone should not be treated as a substitute for measurable surface acceptance requirements.
Corrosion Resistance and Surface Finish Selection
The corrosion resistance of polished stainless steel depends on both the alloy composition and the final surface condition.
Mechanical finishing can influence corrosion performance by changing surface roughness and potentially introducing contamination.
A properly controlled polished surface may help reduce sites where contaminants accumulate, but polishing cannot compensate for an unsuitable material grade or severe service conditions.
Key Selection Considerations
Indoor Decorative Applications
304 or 430 may be considered depending on environmental exposure, cleaning requirements and fabrication conditions.
Humid or Outdoor Environments
Grade selection should account for moisture, deposited contaminants, maintenance access and local corrosion exposure.
Coastal and Chloride-Containing Environments
316L may provide better resistance than 304 in many conditions, but it is not immune to chloride-induced pitting, crevice corrosion or stress-corrosion cracking.
Chemical Processing Applications
Material suitability must be evaluated using the actual chemical concentration, temperature and exposure conditions.
Food-Contact Equipment
Grade selection, surface finish, fabrication quality, cleaning procedures and regulatory requirements must be evaluated together. A decorative polished surface is not automatically a sanitary or food-contact-qualified finish.
For exposed architectural applications, project designers should also consider surface orientation, drainage, cleaning frequency and contamination from adjacent materials.
Processing and Fabrication Considerations
Slitting
Polished stainless steel coils may be slit into narrower widths for downstream manufacturing.
Slitting requirements should include width tolerances, edge condition, burr limits, minimum slit width and recoiling arrangements.
Cut-to-Length Processing
Coils may be processed into sheets for subsequent fabrication.
The finished sheets should meet the agreed requirements for surface protection, dimensions and flatness.
Bending and Forming
Bending requirements depend on material grade, thickness, mechanical condition, bend direction and tooling.
Protective film may help reduce surface damage, but compatibility with the forming process should be confirmed.
Welding
Welding procedure selection depends on stainless steel grade, joint design and service requirements.
Appearance-sensitive welded components may require additional surface restoration and finishing after fabrication.
Surface Protection During Fabrication
Dedicated stainless steel tools and suitable handling procedures should be used to minimize embedded iron contamination, scratches and cross-contamination from carbon steel.
Protective film should be removed according to the agreed handling instructions, taking into account storage conditions and adhesive compatibility.
Applications of Polished Stainless Steel Coil
1. Architectural Cladding and Decorative Panels
No.4, hairline and satin stainless steel finishes are used for decorative panels, wall cladding, columns and other architectural components.
Surface grain direction and finish consistency should be controlled across adjoining panels.
2. Elevator Interiors and Door Panels
Hairline and satin stainless steel are commonly selected for elevator interiors, doors and decorative trim.
Appearance uniformity, scratch control and protective film are important procurement considerations.
3. Kitchen and Commercial Equipment
Polished stainless steel can be fabricated into kitchen equipment housings, panels and selected commercial equipment components.
Material grade, surface cleanability and hygiene requirements must be confirmed for the actual application.
4. Home Appliance Manufacturing
Polished stainless steel coils are used for selected appliance panels, decorative components, enclosures and trim.
OEM buyers should specify finish reference samples, surface defects, forming requirements and coil dimensions.
5. Industrial Equipment and Machinery
Stainless steel polished coils can be processed into machinery covers, equipment enclosures and fabricated panels where corrosion resistance and appearance are required.
6. Metal Fabrication and Decorative Profiles
Slit coils can be processed into profiles, trims and decorative components for architectural and industrial applications.
Processing requirements should address bending behavior, surface grain orientation and protection of exposed surfaces.
Product Standards and Technical Delivery Requirements
| Standard | Scope | Procurement Relevance |
| ASTM A240/A240M | Chromium and chromium-nickel stainless steel plate, sheet and strip | Grade chemistry and applicable mechanical requirements |
| ASTM A480/A480M | General requirements for flat-rolled stainless products | Dimensions, tolerances, finishes and general delivery requirements |
| ASME SA-240/SA-240M | ASME-adopted flat stainless steel material specification | Specified code-related material procurement |
| EN 10088-2 | Stainless steel flat products | Material grades, delivery conditions and finish designations |
| JIS G4305 | Cold-rolled stainless steel plate, sheet and strip | Applicable Japanese material requirements |
| EN 10204 | Metallic product inspection documents | Inspection document types, including Type 3.1 |
Buyers should identify the applicable standard edition, material grade, finish requirements and inspection documentation in the purchase order.
ASTM A480/A480M is a general requirements specification and should be used together with the applicable material specification where required.
Delivery Standard and Purchase Order Requirements
A complete technical purchase order should define:
Material grade and product specification
Applicable standard edition
Final thickness and tolerances
Coil width, edge condition and width tolerance
Coil inner diameter and maximum coil weight
Finish designation and approved appearance sample
Polishing direction and finished side
Required Ra or other finish acceptance criteria
Surface protection and protective film
Inspection, documentation and packaging requirements
Inspection & Quality Assurance
Product inspection should address both material compliance and the finished decorative surface.
Chemical Composition Verification
Review material certificates and conduct positive material identification (PMI) where specified and technically applicable.
Mechanical Property Verification
Confirm tensile, yield and elongation requirements against the material specification and certified delivery condition.
Dimensional Inspection
Check thickness, width, edge condition and other agreed dimensions.
Surface Roughness Measurement
Measure surface roughness where required using agreed equipment, parameters and measurement direction.
Visual Surface Inspection
Inspect the finished coil for unacceptable scratches, dents, staining, polishing inconsistencies and contamination against agreed acceptance criteria.
Coil Condition Inspection
Check winding condition, edge protection, visible coil damage and packaging suitability.
Material Traceability
Maintain identification linking the supplied material to the relevant heat or lot documentation according to the agreed traceability procedure.
Inspection Documentation
Depending on the purchase order, documentation may include:
Material Test Certificate (MTC)
EN 10204 Type 3.1 inspection certificate
Chemical composition and mechanical test records
Dimensional inspection records
Surface inspection records
PMI results where required
Third-party inspection reports where arranged
Inspection requirements and document availability should be confirmed before order acceptance.
Packaging and Export Delivery
Polished stainless steel coils require protective packaging to preserve surface appearance during transportation and handling.
Suitable export packaging may include:
Surface Protection
Protective film applied to the specified finished surface.
Moisture Protection
Water-resistant wrapping and moisture-control measures appropriate to the transportation route.
Edge Protection
Protection against damage to coil edges during handling and loading.
Palletized or Reinforced Packaging
Packaging configurations selected according to coil weight, transport method and unloading requirements.
Coil Identification
Labels identifying grade, dimensions, finish, weight and traceability information.
Export Documentation
Commercial invoice, packing list, material certificates and other agreed shipping documents.
Special requirements such as maximum pallet weight, container-loading restrictions and lifting arrangements should be confirmed before shipment.
Why Choose Xi'an Dongmeng Group Co., Ltd.?
Material and Grade Selection Support
We assist buyers in reviewing stainless steel grade selection according to their intended application and purchase specification.
Multiple Surface Finishing Options
No.4, hairline, satin and other agreed finish requirements can be evaluated based on available material and processing capability.
Customized Order Specifications
Coil width, thickness, surface protection and downstream processing requirements can be reviewed for project-specific procurement.
Material and Surface Documentation
Inspection and traceability requirements can be incorporated into the purchasing process when agreed in advance.
International B2B Supply
We serve distributors, contractors, equipment fabricators and industrial procurement teams requiring stainless steel products for international projects.
Our objective is to help customers specify the correct material and surface finish before production, reducing avoidable finish mismatch, processing problems and purchasing uncertainty.
Frequently Asked Questions
1. What is a polished stainless steel coil?
A polished stainless steel coil is a continuous flat-rolled stainless steel product that has undergone mechanical finishing to achieve a defined surface appearance or texture.
2. What is the difference between polished and brushed stainless steel coil?
Brushed stainless steel normally describes a directional textured surface. Polished stainless steel is a broader term that can include several mechanically finished surfaces, including No.4, satin, hairline and highly reflective polishing.
3. Is No.4 stainless steel the same as hairline stainless steel?
No.4 and hairline finishes are related but not necessarily identical. Hairline generally emphasizes long, continuous linear grain, while No.4 is a general-purpose polished finish. Appearance should be confirmed with reference samples.
4. Is 2B stainless steel a polished finish?
No. 2B is a cold-rolled mill finish. It is not equivalent to a mechanically polished No.4 or hairline finish, although it may be used as the starting substrate for polishing.
5. What is the difference between BA and No.8 mirror finish?
BA is produced through bright annealing and associated mill processing, while No.8 generally involves additional mechanical polishing and buffing. Similar visual brightness does not make the two specifications interchangeable.
6. What grades are available for polished stainless steel coils?
Common grades include 304, 304L, 316, 316L and 430. Grade 201 and additional alloys may also be considered depending on the application and material availability.
7. What thicknesses are available?
The listed product range is 0.3–3.0 mm, with common widths of 1000, 1219 and 1500 mm. Other dimensional combinations are subject to confirmation.
8. Can polished stainless steel coil be slit into narrow strips?
Yes. Narrow slit-coil requirements can be evaluated according to thickness, material grade, minimum width, edge condition and processing capability.
9. What surface roughness should I specify?
The required Ra value depends on the surface finish, application and acceptance requirements. For critical projects, specify a measurable roughness limit together with an approved reference sample.
10. Is polished 316L stainless steel suitable for coastal applications?
316L generally offers better resistance to localized corrosion than 304 in many chloride-containing conditions. However, actual suitability depends on exposure, design details, temperature, maintenance and surface condition.
11. Can polished stainless steel coils be supplied with protective film?
Protective film can be specified subject to compatibility with the finish and subsequent fabrication process. The film type, thickness, adhesive behavior and removal conditions should be agreed before production.
12. What information is required for a quotation?
Please provide the grade, standard, thickness, width, finish, polishing direction, required coil ID, coil weight, quantity, destination, packaging and inspection requirements. For appearance-sensitive projects, include an approved sample or surface specification.
Contact Us – Request a Polished Stainless Steel Coil Quotation
Looking for polished stainless steel coils for architectural fabrication, OEM manufacturing or industrial equipment production?
Xi'an Dongmeng Group Co., Ltd. can review your material, dimensional and finishing requirements and provide a quotation based on the agreed technical specifications.
Send us your requirements:
Stainless steel grade: 304 / 304L / 316 / 316L / 430 / Other
Finish: No.4 / Hairline / Satin / Customized
Thickness and width
Coil ID and maximum coil weight
Surface roughness or approved reference sample
Required quantity and destination
Inspection and documentation requirements
Request a Quote | Submit Drawings | Request Surface Samples | Ask for Technical Documents
Office Information
Company: Xi'an Dongmeng Group Co., Ltd.
Phone / WhatsApp: +86 157 6921 4734
Email: office@dongmjd.com
Office Address: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China.
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