Leading stainless steel coil Suppliers in China

Daxun has been engaged in international business for more than ten years. In 2023, its export revenue exceeded US$100 million, and its export volume ranked among the top Chinese stainless steel manufacturers. Daxun continues to improve its service skills. In order to serve the global market, we have established three export service facilities in China and cooperated with engineering enterprises, steel mills and international trading companies. Daxun provides stainless steel chain services and has established long-term cooperative relationships with dozens of well-known steel mills around the world. Its inventory includes 50,000 tons of conventional stainless steel coils and 20,000 tons of duplex steel, nickel-based alloys, heat-resistant steel and other metals. Daxun’s stainless steel materials are of consistent quality. Types, specifications and delivery weights strictly comply with standards.

Grade 409

• Grade 409 is titanium-stabilized ferritic stainless steel. Grade 409, a general-purpose chromium stainless steel, is mostly used for automotive exhaust systems. This material is suitable for applications that prioritize mechanical qualities, corrosion resistance, and weldability over appearance, especially at high temperatures.
• ASTM requirements, including ASTM A240M for flat rolled steel, now use S40910, S40920, and S40930 as “sub-grades” instead of generic grade 409.
• These are stabilised to varying degrees with titanium, niobium, or a combination of the two.Any of these could be certified as S40900 (Grade 409). ASTM A268M only lists standard Grade 409 for covering tubes.

Corrosion Resistance:

• Grade 409 is resistant to both atmospheric and exhaust gas corrosion. In most environments, a light surface rust develops, which prevents further corrosion but is not suitable for cosmetic purposes. Corrosion resistance is comparable to 3CR12 and 12% chromium martensitic grades (410), but lower than 17% chromium grade 430.

Heat resistance

• 409 is resistant to scaling in intermittent service up to 815°C and continuous service up to 675°C. However, these temperatures vary according on the specific service environment.

Heat Treatment

• Annealing Heat to 790-900 degrees Celsius and then cool with air. This grade cannot be toughened through heat treatment.

Welding

• Easy to weld, however a pre-heat of 150-260°C is suggested. Although Grade 409 or Grade 430 electrodes or filler rods can be used, welding using Grade 309 rods or electrodes is pre-qualified per AS 1554.6. These austenitic fillers produce a more ductile weld.
• Post-weld annealing at 760-815°C increases weld ductility.
  Welding tiny sections does not require post-weld annealing. Automotive exhaust tubing is usually welded without filler metal (autogenously).
  To avoid the impacts of grain formation, all welding must be done with as little heat as possible.

Typical Applications

Automotive exhaust systems, such as catalytic converters and mufflers.

Specified Properties

• ASTM A268M specifies the parameters of Grade 409 for annealed tubing. ASTM A240M specifies the composition of additional grades for coil and sheet applications. Other items’ specifications may include similar but not identical properties.

FORMING:

1. 409 stainless can be cut, blanked stretch formed and drawn without difficulty. The formability characteristics of Type 409 are very similar to carbon steel.

What are the commonly used surfaces of stainless steel coils?

The surface finish of 201 stainless steel coil might vary depending on the cold rolling processing methods used and the surface treatment used after rolling. Surface treatments for stainless steel coils include NO.1, 2B, 4, HL, 6, 8, BA, TR hard, heavy rolling bright 2H, polished bright, and other surface treatments:

• NO.1: The surface obtained after hot rolling, heat treatment and pickling of stainless steel strip. It is used to remove the black oxide scale formed by pickling or similar processes during hot rolling and heat treatment. It ranks first in surface treatment. The No. 1 surface is silvery white and matte. It is generally used in heat-resistant and corrosion-resistant industries that do not require high surface gloss, such as the alcohol industry, chemical industry, large containers, etc.
• 2B: Unlike the 2D surface, the 2B surface is smoothed by a light roller, and the surface is brighter. The surface roughness Ra value measured by the equipment ranges from 0.1 to 0.5μm, which is a typical value for most processing types. This stainless steel strip surface has the strongest adaptability and is suitable for industries such as chemical, papermaking, petroleum, medical, and a wide range of fields such as building curtain walls.
• TR hard surface: TR stainless steel is also called hard steel. Its characteristic steel grades include 304 and 301, which are used for items that require high strength and hardness, such as railway vehicles, conveyor belts, springs and washers. The idea is to use the work hardening characteristics of austenitic stainless steel to improve the strength and hardness of steel coils through cold working methods such as rolling. In order to replace the gentle flatness of the 2B base surface, the hard material is gently rolled by a few percent to tens of percent, and no annealing is performed after rolling. Therefore, the TR hard surface of the hard material is the rolled surface after the cold rolling process.
• Re-rolled bright 2H: After the rolling operation, the stainless steel strip will be bright annealed. A continuous annealing line can be used to quickly cool the strip. The stainless steel strip travels along the line at a speed of 60-80m/min. After this process, the surface finish will be 2H re-rolled bright.
• No. 4: The No. 4 surface has a good polishing effect and is brighter than No. 3. It can also be obtained by polishing the cold-rolled stainless steel coil with a 2D or 2B surface, and then polishing the processed surface with a sanding belt with a particle size of 150-180#. The tool measures the surface roughness (Ra) between 0.2 and 1.5μm. The No. 4 surface is widely used in restaurants and cooking equipment, medical equipment, architectural decoration, containers and other applications.
• HL: The HL surface is often called a hairline finish. The Japanese JIS standard specifies a continuous hairline abrasive surface obtained by polishing with a 150-240# abrasive belt. The restrictions under the Chinese GB3280 standard are unclear. HL surface finish is commonly used for architectural decoration, such as elevators, escalators, and exterior walls.
• No. 6: The No. 6 surface is further polished on the basis of No. 4 with a Tampico brush or a W63 grit abrasive material specified in the GB2477 standard. The surface has good metallic luster, softness, weak reflection, and no imaging. Due to its good performance, it is very suitable for curtain walls, tassel decoration, and cooking supplies.
• BA: BA is a surface that is brightly heat treated after cold rolling. Bright heat treatment is annealing in a protective atmosphere to ensure that the surface is not oxidized and retain the gloss of the cold-rolled surface, and then it is polished with a high-precision smooth roller to improve the surface brightness. The instrument evaluates the surface roughness to be 0.05-0.1μm, indicating that the surface is close to a mirror surface. BA surfaces can be used in a variety of applications, including food utensils, household appliances, medical equipment, automotive parts, and decorations.
• No. 8: Mirror surface, maximum reflectivity, no abrasive particles. The stainless steel deep processing industry also refers to 8K board. BA material is often used as raw material for mirror processing. It only needs to be polished. The surface is beautiful after mirror processing and is often used in building entrances and interior decoration.

What is the standard sea packaging  stainless steel coil?

• Standard export sea packaging:
  Waterproof Paper Winding+PVC Film+Strap Banding+Wooden Pallet or Wooden Case;
• Customized packaging as your request (Logo or other contents accepted to be printed on the packaging);
• Other special packaging will be designed as customer’s request;
  Eye to wall and eye to sky are both available;
• By International Express: DHL/UPS/FEDEX/EMS and our own express line;
• By air, sea or land;
• Shipping Port: Shanghai, Ningbo, Qingdao, Tianjin or as your request.

Why choose Daxun’s stainless steel coils？

Reliable Stainless Steel Coils and Sheets Inventory Guarantee

• Have you ever been in a situation where you required a significant quantity of stainless steel coils right away, only to discover that the supplier was running low on stock? This condition may impair your workflow and plans.
• Our Advantages: With us, this situation will be a thing of the past. Our inventory is always ample, guaranteeing that even the largest orders are fulfilled quickly and in accordance with your business schedule.

Custom Stainless Steel Material Processing

• You may have experienced a circumstance in which bespoke processing is required, but locating the correct supplier to match your exact requirements might be difficult.
• Our Advantages: We have great processing capabilities to satisfy any of your specific needs. Whether it is size, stainless steel surface treatment, or other unique requirements, we offer expert one-stop service.

Competitive Stainless Steel Prices

• When looking for a stainless steel coil provider, price is typically a major factor. You may have to make a compromise with your chosen supplier due to excessive costs.
• Our Advantages: We keep pricing low by implementing excellent cost control and improved sourcing methods. This implies that by choosing us, you will not only receive high-quality products but also outstanding value for money.

Various Specifications of Stainless Steel Coils in Stock

• Finding stainless steel coils with exact specifications might be a challenge. It is critical to select a supplier who understands and serves these specific needs.
• Our Advantages: Our portfolio demonstrates versatility, with a wide choice of materials, thicknesses, and widths. We take pleasure in our ability to satisfy your project’s exact specifications.

Precision Stainless Steel Shearing Service.

• Precision shearing is required for the usage of stainless steel coils, but not all vendors offer this precise service.
• Our Advantages: Our shearing service is both professional and efficient, delivering precise cuts that fit your exact demands.

Contact your stainless steel coil suppliers

• You can easily order stainless steel coils in any size and quantity online.
  Alternatively, our friendly sales team will be happy to take your order. Simply call +86 13382898899 or email Daxunhejin@gmail and we will get back to you as soon as possible.