Standard Size Q195 Ss400 Black Anneal Steel Angle

This product line focuses on high-quality standard-size black anneal steel angles, engineered with two core carbon structural steel grades-Q195 and SS400, and processed via professional black annealing technology to enhance material performance and surface quality. As a versatile structural section steel, it features a precise 90-degree symmetrical L-shaped cross-section with standardized equal leg dimensions, strictly adhering to international size standards to ensure wide compatibility and interchangeability. Crafted from high-purity carbon steel, this black anneal steel angle combines superior ductility, excellent processability, and cost-efficiency, serving as a reliable structural and fabrication material for diverse industrial, construction, and hardware applications worldwide.

Core Material Grades & Mechanical Performance

All standard-size black anneal steel angles in this series are manufactured from premium carbon steel, with two mainstream grades that cater to different load-bearing requirements and application scenarios, ensuring consistent quality and adaptability across global markets.

1. Q195 Carbon Steel Black Anneal Angle

Q195 is a low-carbon structural steel grade complying with Chinese National Standard (GB/T 700), where the letter "Q" denotes yield strength, with 195 representing a minimum yield strength of 195 MPa. Characterized by ultra-low carbon content, Q195 exhibits exceptional ductility, toughness, and formability, making it highly suitable for cold bending, stamping, and other precision processing. After black annealing treatment, its internal stress is effectively eliminated, further improving material uniformity and reducing the risk of deformation during secondary processing. This grade is an optimal choice for light-duty structural components, hardware fittings, and low-load support applications, offering excellent cost-efficiency without compromising basic structural reliability.

2. SS400 Carbon Steel Black Anneal Angle

SS400 is a standard general-purpose carbon structural steel grade conforming to Japanese Industrial Standards (JIS G3101), where "SS" stands for Steel Structure and 400 indicates a minimum tensile strength of 400 MPa. With moderate carbon content, SS400 delivers balanced mechanical properties, including good strength, ductility, and weldability, suitable for light to medium-duty structural applications. The black annealing process enhances its surface finish and internal structure, eliminating residual stress from hot rolling and improving the material's machinability and corrosion resistance. SS400 black anneal steel angles are widely used in industrial frameworks, mechanical supports, and construction auxiliary structures, especially in markets adhering to JIS standards, delivering stable performance and long-term durability.

Black Annealing Process & Its Advantages

The black annealing process is a critical heat treatment step for our steel angles, designed to optimize material performance and surface quality. After hot rolling, the steel angles are heated to a controlled temperature (typically 650-750℃) in a protective atmosphere, followed by slow cooling. This process effectively eliminates internal residual stress generated during rolling, prevents material deformation, and refines the internal microstructure, enhancing ductility and toughness.

The black annealing treatment also imparts a uniform, sleek black surface finish to the steel angles, reducing surface oxide scale and improving surface cleanliness. This black surface not only enhances the product's aesthetic appearance but also provides a basic anti-rust effect, extending the service life in general indoor environments. Additionally, the annealed surface improves the adhesion of subsequent surface treatments (such as painting or galvanizing), making it suitable for applications with higher anti-corrosion requirements.

Standard Size Specifications & Product Features

Our Q195 and SS400 black anneal steel angles are produced in full compliance with international standard size specifications, covering a comprehensive range of equal leg dimensions (e.g., 20×20mm, 30×30mm, 40×40mm, etc.) with strict control over leg length, thickness, and 90-degree right-angle precision. The standardized size ensures seamless compatibility with global project designs, simplifying procurement, inventory management, and on-site assembly.

In addition to the advantages of black annealing, the products feature a dense internal structure, free from porosity, inclusions, and other defects, ensuring consistent mechanical performance. They exhibit excellent processability, supporting conventional processing methods such as welding, cutting, bending, and drilling, which greatly simplifies on-site fabrication and installation. The hot-rolled base material combined with black annealing treatment ensures the steel angles can withstand daily structural stress without deformation or fracture.

Key Product Advantages

Professional Black Annealing: Eliminates internal residual stress, improves ductility and toughness, reduces deformation risk, and enhances surface quality with a uniform black finish.

Dual-Grade Versatility: Q195 for light-duty, cost-sensitive applications; SS400 for medium-duty, higher-strength requirements, covering diverse project needs.

Standardized Sizes: Strict compliance with international size standards, ensuring wide compatibility, interchangeability, and suitability for bulk procurement.

Superior Processability: Excellent weldability, cuttability, and formability, facilitating efficient secondary processing and on-site installation, reducing labor costs.

Cost-Effective Quality: High-purity carbon steel combined with professional heat treatment, offering optimal cost-performance ratio for both small-scale and large-scale projects.

Basic Anti-Rust Protection: Black annealed surface provides inherent anti-oxidation performance, extending service life in general indoor and mild outdoor environments.

Main Application Scenarios

This series of standard-size Q195 and SS400 black anneal steel angles is extensively applied in industrial, construction, and hardware manufacturing fields. Q195 grade is ideal for light-duty applications such as hardware fittings, small support brackets, decorative components, and precision stamping parts. SS400 grade is suitable for industrial frameworks, mechanical equipment supports, warehouse shelves, pipeline brackets, and construction auxiliary structures. The black annealed surface makes it particularly suitable for applications where aesthetic appearance and basic anti-rust performance are required, such as indoor decoration, furniture manufacturing, and light industrial fabrication. With its standardized size, reliable quality, and superior processability, this black anneal steel angle serves as an indispensable material for global engineering and fabrication projects.