316 Prepainted Stainless Coil

Frequently Asked Questions

Q: What is the difference between 316 and 304 prepainted stainless steel coils?

A: 316 stainless steel contains 2-3% molybdenum, which gives it superior chloride ion resistance compared to 304 grade. 316 can withstand 1200+ hours of neutral salt spray testing, while 304 typically fails after 300-500 hours. For coastal areas or chemical environments, 316 is the only recommended option.

Q: Which coating type is best for 316 prepainted stainless steel in chemical plants?

A: For chemical plant applications, we recommend PVDF coating with a total thickness of 25μm (5μm primer + 20μm topcoat). PVDF coatings offer excellent resistance to acids, alkalis, and solvents, and can withstand temperatures up to 150°C. For less severe chemical environments, HDP coating is a cost-effective alternative.

Q: Can 316 prepainted stainless steel coil be welded or formed without damaging the corrosion resistance?

A: Yes, 316 prepainted stainless steel can be bent, formed, and welded. However, welding will burn off the coating in the heat-affected zone (HAZ). We recommend using 316L stainless steel welding electrodes and applying a touch-up coating to the HAZ after welding to restore corrosion resistance. We provide free touch-up paint with all orders.

Q: How do I maintain 316 prepainted stainless steel in coastal areas?

A: To maximize the service life of 316 prepainted stainless steel in coastal areas:

Rinse the surface with fresh water every 3-6 months to remove salt deposits

Avoid using abrasive cleaners or steel wool that can scratch the coating

Inspect the surface annually for any signs of damage and repair promptly

Keep gutters and drainage systems clear to prevent standing water

Q: What is the maximum temperature resistance of 316 prepainted stainless steel coil?

A: The temperature resistance depends on the coating type:

PE coating: 80°C continuous, 100°C intermittent

SMP coating: 100°C continuous, 120°C intermittent

PU coating: 120°C continuous, 150°C intermittent

HDP coating: 140°C continuous, 160°C intermittent

PVDF coating: 150°C continuous, 180°C intermittent

The 316 stainless steel substrate itself can withstand temperatures up to 870°C.

Q: Can 316 prepainted stainless steel be used for food processing equipment?

A: Yes, our 316 prepainted stainless steel coils with food-grade PU coating are suitable for food processing applications. The coating is non-toxic, resistant to cleaning chemicals, and easy to sanitize. All food-grade products come with FDA compliance certificates.

Q: How does the price of 316 prepainted stainless steel compare to other grades?

A: 316 prepainted stainless steel is approximately 2-3 times more expensive than 201 prepainted stainless steel and 1.5 times more expensive than 304 prepainted stainless steel. However, its superior corrosion resistance results in a much lower total cost of ownership over the product's lifespan, especially in harsh environments.

Q: What is the current price of 316 prepainted stainless steel coil per ton?

A: As of June 2026, the FOB Qingdao price ranges from $2,800 to $4,200 per ton. The exact price depends on four main factors: substrate grade (316 vs 316L), coating type (PVDF is 15-20% more expensive than PE), thickness (thinner gauges cost more per ton), and order quantity (bulk orders over 20 tons qualify for volume discounts). Raw material prices fluctuate weekly, so please contact our sales team for a real-time quote valid for 7 days.

Q: Do you supply 316L prepainted stainless steel coil?

A: Yes, we offer 316L low-carbon prepainted stainless steel coils as a standard option. 316L has a carbon content of ≤0.03% (compared to ≤0.08% for standard 316), which significantly reduces carbide precipitation during welding. This makes it the preferred choice for applications that require extensive welding, such as chemical piping systems and food processing equipment. All 316L coils come with mill test certificates conforming to ASTM A240/A240M standards.

Q: Are you a specialized PVDF coated 316 stainless steel coil supplier?

A: Yes, we are one of the few Chinese manufacturers with a dedicated PVDF coating line for 316 stainless steel. We use 100% virgin Kynar 500 PVDF resin from Arkema, and our PVDF-coated 316 coils come with a 15-year limited warranty against peeling, fading and rusting in coastal environments. We have supplied over 50,000 tons of PVDF-coated 316 products to chemical plants and coastal projects worldwide.

Q: Do you have 316 prepainted stainless steel coil in 0.5mm thickness?

A: Yes, 0.5mm thickness is our most popular specification for roofing and wall cladding applications. We maintain a regular inventory of 0.5mm x 1000mm and 0.5mm x 1200mm coils in standard colors (white, gray, blue) for immediate shipment. Custom widths and colors for 0.5mm coils have a production lead time of 7-10 days. We also offer 0.3mm, 0.4mm and 0.6mm thickness options for different project requirements.

Q: Is 316 prepainted stainless steel coil suitable for roofing?

A: Absolutely. 316 prepainted stainless steel coil is the best roofing material for coastal and industrial areas. Its superior chloride resistance prevents rusting even in areas with high salt spray, and the PVDF coating provides excellent UV protection and color retention. Unlike galvanized steel roofing, which typically lasts 5-10 years in coastal areas, 316 prepainted stainless steel roofing can last 20-30 years with minimal maintenance. We offer special roofing profiles and accessories to ensure a watertight installation.