Product Detail

Main Application

It is widely used in high temperature applications, medical devices, building materials, chemistry, food industry, agriculture,ship components. It also applies to food, beverage packaging, kitchen supplies, trains, aircraft, conveyor belts, vehicles, bolts, nuts, springs,and screen.

Note:

1.Free sampling, 100% after-sales quality assurance, Support any payment method; 2.All other specifications of round carbon steel pipes are available according to your requirement (OEM&ODM)! Factory price you will get from ROYAL GROUP.

Through different processing methods of cold rolling and surface reprocessing after rolling, the surface finish of stainless steel bars can have different types.

The surface processing of stainless steel coils have NO.1, 2B, No. 4, HL, No. 6, No. 8, BA, TR hard, Rerolled bright 2H, polishing bright and other surface finishes, etc.

NO.1: No. 1 surface refers to the surface obtained by heat treatment and pickling after hot rolling of the stainless steel strip. It is to remove the black oxide scale produced during hot rolling and heat treatment by pickling or similar treatment methods. This is No. 1 surface processing. The No.1 surface is silvery white and matt. Mainly used in heat-resistant and corrosion-resistant industries that do not require surface gloss, such as alcohol industry, chemical industry and large containers.

2B: The surface of 2B is different from the 2D surface in that it is smoothed with a smooth roller, so it is brighter than the 2D surface. The surface roughness Ra value measured by the instrument is 0.1～0.5μm, which is the most common processing type. This kind of stainless steel strip surface is the most versatile, suitable for general purposes, which is widely used in the chemical, paper, petroleum, medical and other industries, and can also be used as a building curtain wall.

TR Hard Finish: TR stainless steel is also called hard steel. Its representative steel grades are 304 and 301, they are used for products that require high strength and hardness, such as railway vehicles, conveyor belts, springs and gaskets. The principle is to use the work hardening characteristics of austenitic stainless steel to increase the strength and hardness of the steel plate by cold working methods such as rolling. The hard material uses a few percent to several tens of percent of the mild rolling to replace the mild flatness of the 2B base surface, and no annealing is carried out after rolling. Therefore, the TR hard surface of the hard material is the rolled after cold rolling surface.

Rerolled Bright 2H: After the rolling process. the stainless steel strips will be processed bright annealing. The strip can be fast cooled by the the continuous annealing line. The traveling speed of the stainless steel strip on the line is around 60m~80m/min. After this step, the surface finish will be 2H rerolled bright.

No.4: The surface of No. 4 is a fine polished surface finish that is brighter than the surface of No. 3. It is also obtained by polishing the stainless steel cold-rolled stainless steel plate with 2 D or 2 B surface as the base and polishing with abrasive belt with a grain size of 150-180# Machined surface. The surface roughness Ra value measured by the instrument is 0.2～1.5μm. NO.4 surface is widely used in restaurant and kitchen equipment, medical equipment, architectural decoration, containers, etc.

HL: HL surface is commonly called hairline finish. Japanese JIS standard stipulates that 150-240# abrasive belt is used to polish the continuous hairline-like abrasive surface obtained. In China’s GB3280 standard, the regulations are rather vague. HL surface finish is mostly used for building decoration such as elevators, escalators, and facades.

No.6: The surface of No. 6 is based on the surface of No. 4 and is further polished with a Tampico brush or abrasive material with a particle size of W63 specified by GB2477 standard. This surface has a good metallic luster and soft performance. The reflection is weak and does not reflect the image. Due to this good property, it is very suitable for making building curtain walls and building fringe decorations, and also widely used as kitchen utensils.

BA: BA is the surface obtained by bright heat treatment after cold rolling. Bright heat treatment is annealing under a protective atmosphere that guarantees that the surface is not oxidized to preserve the gloss of the cold-rolled surface, and then use a high-precision smoothing roll for light leveling to improve the surface brightness. This surface is close to a mirror finish, and the surface roughness Ra value measured by the instrument is 0.05-0.1μm. BA surface has a wide range of uses and can be used as kitchen utensils, household appliances, medical equipment, auto parts and decorations.

No.8: No.8 is a mirror-finished surface with the highest reflectivity without abrasive grains. The stainless steel deep processing industry also calls as 8K plates. Generally, BA materials are used as raw materials for mirror finishing only through grinding and polishing. After mirror finishing, the surface is artistic, so it is mostly used in building entrance decoration and interior decoration.

TThe main processing methods of stainless steel square tubes are:

Rolling stainless steel square tube: The stainless steel square tube metal billet is passed through the gap (various shapes) of a pair of rotating rolls. Due to the compression of the rolls, the material section is reduced and the length is increased. The pressure processing method is commonly used in the production of stainless steel square tubes. It is mainly used to produce stainless steel square tube profiles, plates and pipes. Cold-rolled and hot-rolled.

Forging stainless steel square tube is a pressure processing method that uses the reciprocating impact force of the forging hammer or the pressure of the press to change the blank into the shape and size we need. It is generally divided into free forging and die forging.

Drawing stainless steel square tube: It is a processing method in which the rolled metal billet (form, tube, product, etc.) is drawn through the die hole to reduce the cross-section and increase the length. Most of them are used for cold working.

Extruded stainless steel square tube: It is a processing method in which the stainless steel square tube puts the metal in a closed extrusion tube, and applies pressure at one end to extrude the metal from the specified die hole to obtain a finished product with the same shape and size. Production of non-ferrous metal stainless steel square tube.

Packing and Transportation

The standard sea packaging of stainless steel sheet

Standard export sea packaging:

Waterproof Paper Winding+PVC Film+Strap Banding+Wooden Pallet;

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;

Transportation: Express (Sample Delivery), Air, Rail, Land, Sea shipping (FCL or LCL or Bulk)

Our Customer

FAQ

Q: Are u a manufacturer?

A: Yes, we are spiral steel tube manufacturer locates in Daqiuzhuang village, Tianjin city, China

Q: Can I have a trial order only several tons?

A: Of course. We can ship the cargo for u with LCL serivece.(Less container load)

Q: Do u have payment superiority?

A: For big order, 30-90 days L/C can be acceptable.

Q: If sample free?

A: Sample free, but the buyer pays for the freight.

Q: Are you gold supplier and do trade assurance?

A: We seven years cold supplier and accept trade assurance.