Stainless steels are a family of iron based alloys that contain a minimum of 10.5% chromium (CR). The presence of chromium creates an invisible surface film that resists oxidation and makes the material passive or corrosion resistant (stainless). There are multiple families of stainless steel which are designed for various applications and uses. Stainless grades can be further modified to meet various processing, corrosion, temperature and strength conditions.

The main usage for stainless steel is decoration, with finish of BA, 8k Mirror, hairline, Satin No.4, SB, Bead Blast, Etched, Colored etc.;  and common grade for these docorative sheets are SS201, 304, 316L, 430; 

For Hairline No.4 Brushed finished sheets,, pls check the following some more introductions:

PRODUCT DESCRIPTION
Hairline/No.4 Brushed finish is a two-step abrasive polished finish with superior matching characteristics. It ' s designed for architectural applications. It boasts a more linear appearance than traditional polish, which means it lends itself to repair and blending in the field. Hairline is suitable for coping, trim, elevator cabs, and more. Can be coated with anti-fingerprint coating for interior use.
 

SPECIFICATION
THICKNESS : 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.5, 2.0, 2.5, 3.0MM
SIZE: 1000X2000MM; 1220X2440MM; 1250X2500MM, 1500X3000MM
PACKAGE: Standard export package with metal pallet or as requirement;
 

COLOR AVAILABLE
Brushed finish sheet can be supplied with different colors as Golden, Rose gold, Black, Brown, Bronze, Champagne or as customer requirement.

SELECTING THE GRADE
Hairline/No.4 Brushed finish is widely obtainable in Type 201, 304, 316L, 430;
For the best results over time, selection of the proper grade of Hairline/No.4 Brushed is important.
Type 304, for most environments, is sufficient to prevent corrosion.
Type 316 should be used near the seacoast.
Low carbon grades (304L / 316L) should be used when parts are to be welded.
For extreme locations, e.g. near chemical plants or where steel may come into contact with salt water spray, different alloys will be required, subject to application review.

FABRICATION
Hairline/No.4 Brushed finish can be welded or soldered. Preferably, use a grade of welding wire more noble than the work piece. Through use of shield gasses, formation of a heat tint scale may be avoided in lighter gauges. When scale does form, care must be taken to remove this scale through mechanical or chemical means. Hairline/No.4 Brushed finish is directional, so it is essential to orient panels in relation to the rolling direction. After soldering, flux residue must be thoroughly removed.

INSTALLATION
Hairline/No.4 Brushed finish comes with a protective PVC covering that is high grade UV resistant and is designed to withstand the elements for several weeks. Yet it is recommended that this PVC covering be removed immediately after installation to prevent adhesive residue from adhering to the finish. Hairline/No.4 Brushed finish ' s appearance is very uniform, but any metal surface, including a painted one, is sensitive to misalignment of panels on differing planes. Please take extra care to install within reasonable tolerances to ensure full benefit of Hairline/No.4 Brushed finish ' s unvarying appearance. After installation, any rust stains from tools or construction debris must be removed.
 

Other common Specification for stainless steel sheet