Angang Lianzhong (Guangzhou) Stainless Steel produces specialized hot-rolled coil (HRC) products, including grade 430 stainless steel with a black skin finish, measuring 3.5 millimeters by 1520 millimeters with uncut edges. This industrial flat-rolled material serves manufacturers requiring ferritic stainless steel grades for automotive trim, appliance components, and architectural applications.
Understanding Grade 430 Stainless Steel HRC Specifications
Grade 430 is a ferritic, non-hardenable stainless steel containing straight chromium, which offers corrosion resistance and formability combined with useful mechanical properties. According to metallurgical standards outlined by organizations like ASTM International, the 430 designation indicates a chromium content typically ranging between 16% and 18%, providing solid resistance to nitric acid, sulfur gases, and many organic and food acids.
The designation “black skin” refers to the unannealed and unpickled hot-rolled surface condition that retains the oxide scale formed during the high-temperature rolling process. Manufacturers often supply HRC in this condition for industrial clients who perform their own subsequent processing, such as annealing, pickling, or cold rolling, to achieve specific surface finishes and mechanical tolerances.
Production Parameters at Angang Lianzhong Guangzhou
Operating out of its manufacturing facility in Guangzhou, Angang Lianzhong produces stainless steel coils designed for broad industrial distribution. The specific dimensions—a thickness of 3.5 mm and a width of 1520 mm—represent standard master coil configurations that industrial service centers and re-rollers typically process into narrower strips or cut-to-length sheets.
Uncut edges, often referred to as mill edges, mean the sides of the steel strip are not trimmed after hot rolling. Buyers frequently select mill-edge material when the final application allows for standard width tolerances or when subsequent slitting operations will remove the edge anyway.
Industrial Applications and Market Context
Hot-rolled stainless steel coils find extensive use across heavy manufacturing sectors. Grade 430 HRC with a black skin finish is commonly deployed in environments where aesthetic surface appearance is secondary to structural durability and corrosion resistance prior to finishing. Typical end uses include:
- Automotive exhaust system components and decorative trim
- Internal appliance parts, such as dishwasher linings and refrigerator panels
- Industrial equipment panels and architectural flashing
- Base material for further cold reduction and precision finishing
Market demand for ferritic stainless steel remains tied to raw material costs, particularly the global pricing of chromium and nickel alternatives. While austenitic grades like 304 contain expensive nickel, grade 430 provides a cost-effective alternative for applications that do not require high-nickel corrosion resistance.
Frequently Asked Questions
What does “black skin” mean in stainless steel coils?
Black skin refers to the dark oxide scale that develops on the surface of the steel during hot rolling. This layer is typically removed via pickling (acid washing) if a bright or polished finish is required.
What are the primary characteristics of grade 430 stainless steel?
Grade 430 is a ferritic stainless steel known for its good corrosion and heat resistance, magnetic properties, and formability, making it popular in automotive and appliance manufacturing.
Why are coil edges left uncut?
Uncut or mill edges are the natural edges produced during the rolling process. Buyers often choose uncut edges to reduce initial material costs when exact width tolerances are not immediately required.