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.

What are 904L’s best qualities?

• This grade of stainless steel contains little carbon content. It is high in copper, which increases resistance to strong acids like sulphuric acid. The high concentration of nickel makes it resistant to stress corrosion cracking. It is also extremely resistant to crevice corrosion and stress corrosion cracking, which can affect other forms of steel. It can be employed in a variety of demanding conditions, including warm waters and chloride exposure. It’s suitable for both moderate and aggressive conditions.
• This type of stainless steel is extremely heat resistant, withstanding temperatures up to 400 degrees Celsius. It is heat treatable at temperatures ranging from 1090 to 1175 degrees Celsius, followed by quick cooling. This type of heat treatment is an excellent choice for hardening 904L steel.
• This type of steel is nonmagnetic due to its composition. It has great weldability, formability, and toughness in a variety of circumstances.
• 904L steel can be welded using any normal method, with no need for pre-heat or post-weld heat treatments.

What is 904L used for?

As mentioned earlier, 904L steel is the stainless steel used in the construction of Rolex watches. In industrial settings, it is valued for its high purity and its low sulfur content. A few of the places 904L is used includes:

• Seawater cooling devices.
• Wiring in electrostatic filtration devices.
• Oil refinery components.
• Gas scrubbing plant parts.
• Machinery for pulp and paper processing.
• Parts in machines used in sulfuric, acetic and phosphoric acid processing plants.

Fabrication Data

• Alloy 904L can be easily welded and processed by standard shop fabrication practices.

Cold Forming

• 904L is quite ductile and forms easily. The addition of molybdenum and nitrogen implies more powerful processing equipment may be necessary when compared with the standard 304/304L grades.

Hot Forming

• Hot working procedures require temperatures ranging from 1562 to 2102°F (850 -1150°C). Normally, hot working should be followed by a solution anneal and quench; however, for 904L, if hot forming is stopped at a temperature over 2012°F (1100°C) and the material is quenched immediately after, the material may be utilized without further heat treatment. It is critical that the entire workpiece be quenched from temperatures above 2012°F (1100°C). When partial heating or cooling falls below 2012°F (1100°C), or if cooling is too sluggish, hot working should always be followed by a solution anneal and quenching. 904L should be solution annealed at 1940-2084°F (1060-1140°C).

Machining

• The cold work hardening rate of Alloy 904L makes it less machinable than 410 and 304 stainless steels.

Welding

• Most conventional welding methods are compatible with Alloy 904L. Austenitic plate materials have a uniform austenitic structure and an equitable distribution of alloying elements. Certain elements, including as molybdenum, chromium, and nickel, are redistributed during solidification after welding. These segregations stay in the cast structure of the weld and can reduce corrosion resistance in certain situations. Segregation is less noticeable in 904L, which is typically welded with a filler metal of the same composition as the base metal but can also be welded without filler metal.
• The welding consumables for 904L are 20 25 CuL covered electrode and 20 25 CuL wire.

What are the applications that 904L stainless steel coils can be used?

Due to excellent corrosion resistance, quality grade 904L stainless steel coils are widely used for below applications.

1. Petrochemical equipment, reactor
2. Heat exchanger
3. Power plant flue gas desulfurization device
4. Organic acid treatment system
5. Sea water heat exchanger
6. Paper industry equipment
7. Pharmaceutical industry and other chemical equipment
8. Pressure vessel
9. Food equipment

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 plates 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 plate 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 of 201 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.

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.