Stainless steel angle (commonly known as stainless steel angle iron) is a long steel product with two sides positioned at a right angle to each other. As a fundamental stainless steel profile, it is widely used in sectors such as construction, machinery, and the chemical industry due to its excellent corrosion resistance and high strength.

Classification of Stainless Steel Angles:

1. By shape: This is the primary classification method.
Equal-leg angle: The widths of the two legs are equal.
Unequal-leg angle: The widths of the two legs are unequal.
2. By material: Covers major stainless steel series.
Austenitic stainless steel: Includes grades such as 304, 304L, 316, 316L, 321, and 310S; this is the most widely used category.
Economical stainless steel: Includes grades such as 201 and 202.
Ferritic stainless steel: Includes grade 430.
Duplex stainless steel: Includes grade 2205.
3. By production process:
Hot-rolled angle: Formed via high-temperature rolling; this is the most common production method.
Cold-drawn angle: Produced via a drawing process at room temperature, offering higher dimensional accuracy.

Production Process and Performance Characteristics

Production process: 

The core production method is hot rolling. The general workflow is: raw steel billet (usually low-carbon square billet) → heating (1150–1250°C) → multi-pass rolling → cooling → straightening → pickling/surface treatment.

Key properties:
Corrosion resistance: A dense, chromium-rich oxide film on the surface is key to its corrosion resistance. Grade 304 is a general-purpose type, while grade 316L offers superior resistance to pitting and chloride-ion corrosion due to the addition of molybdenum (Mo).

Mechanical properties: Taking grade 304 as an example, its yield strength is typically no less than 205 MPa; it features excellent weldability and moderate mechanical strength.
Workability: It supports secondary processing such as cutting, drilling, and welding, making it easy to fabricate into various structural components.

Application Areas of Stainless Steel Angles

1. Construction sector: Stainless steel angles can be used for interior decoration materials, exterior wall cladding, roofing, and other architectural components. 

2. Machinery Manufacturing: Stainless steel angle bars are widely used in the manufacture of machinery and equipment, lightweight steel structures, automotive components, and more.
3. Shipbuilding: Stainless steel angle bars can be used to fabricate ship hulls, plating, marine equipment, and other components.

Stainless steel angle bars are a fundamental and important type of stainless steel profile. Their production primarily adheres to the YB/T 5309-2023 standard, and they are available in a wide range of specifications and material grades, such as 304 and 316L. Combining high strength, excellent corrosion resistance, and good workability, they serve as a key foundational material bridging industrial and civil applications, as well as traditional and emerging sectors.
When selecting the appropriate product, factors such as the specific operating environment, load-bearing requirements, and budget should be comprehensively considered alongside the material 

The specification size of stainless steel angle is reflected by its model number. Commonly used models in China are L-type, I-type, equilateral angle, etc., while internationally there are C-type, U-type, Z-type and other models. The size and thickness of the stainless steel angle size also differ, and must be selected in accordance with the specifications and actual use. In specific applications, should also pay attention to stainless steel angle hardness, toughness, processability and corrosion resistance and other aspects of the indicators. The following are common national implementation standards

Chinese standard.
GB/T 706-2016 "hot rolled steel sections
This standard specifies the hot rolled I-beam, hot rolled channel steel, hot rolled equilateral angle steel, hot rolled unequal angle steel, hot rolled order content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate. This standard applies to hot rolled equilateral angle steel, hot rolled unequal angle steel and hot rolled I-beam and hot rolled channel steel with sloping inside leg.

American Standard:
ASTM A276 standard specifies the chemical composition, mechanical properties, processing performance and marking information of stainless steel angle, ASTM A276 standard also specifies the processing performance index and marking requirements of stainless steel angle, which makes it easier for users to identify and select the required materials.

British Standard:
BS EN 10056-1 The standard specifies the stainless steel and other materials, "hot rolled equilateral equilateral angle" size, shape, allowable deviations and technical requirements.

Japanese Standard: JIS G 4317 This standard covers the chemical composition, mechanical properties and dimensional tolerances of stainless steel angles.

The specifications of stainless steel angle bars are determined by their leg lengths and thickness.
Designation: Specifications are typically expressed in millimeters as "∠leg width × leg width × thickness." For example, "∠25×25×3" denotes an equal-leg angle bar with a leg width of 25 mm and a thickness of 3 mm. They can also be designated by a size number representing the leg width in centimeters; for instance, "∠3#" indicates a leg width of 3 cm.
Common specifications: Leg widths typically range from 20 mm to 200 mm.
Theoretical weight calculation: This is a key factor when selecting materials. The calculation formulas are:
Equal-leg angle bar: Weight per meter (kg) = 0.00793 × (leg width + leg width - thickness) × thickness.
Unequal-leg angle bar: Weight per meter (kg) = 0.00793 × (long leg width + short leg width - thickness) × thickness.

Because of the wide range of uses of stainless steel angle, there are many specifications, and different specifications of the size of the use is not the same.
The following are some common product specifications
1、Width 20mmx20mm;thickness 3mm
2、Width 25mmx25mm; thickness 3mm, 4mm, 5mm
3、Width 30mmx30mm;thickness 3mm,4mm,5mm
4、Width 40mmx40mm ;thickness 3mm,4mm,5mm,6mm
5、Width 50mmx50mm;thickness 3mm,4mm,5mm,6mm,7mm,8mm
6、Width 60mmx60mm;Thickness 5mm,6mm,7mm,8mm
7、Width 65mmx65mm ;thickness mm, 6mm, 7mm, 8mm
8、Width 70mmx70mm ;thickness 6mm,7mm,8mm,9mm,10mm
9、Width 75mmx75mm ; Thickness 6mm,7mm,8mm,9mm,10mm
10、Width 80mmx80mm ; Thickness 7mm,8mm,9mm,10mm
11、Width 100mmx100mm ; thickness 8mm, 9mm, 10mm, 12mm

Allowable deviation of stainless steel angle:

1.Size deviation
Angle steel national acceptance standards allow dimensional deviations including length, width, thickness, equilateral angle and burr length. Specifically, the allowable length deviation is ±5mm or 0.5%, whichever is greater. The allowable deviation for width and thickness is ±2mm or 0.2m, whichever is greater. For equal corners and length of burrs, the allowable deviation range is ±1mm or 0.2mm, whichever is greater.

2.Weight deviation
The weight deviation allowed by the national acceptance standard for angles refers to the difference between the weight of the angle and the specification. The permitted weight deviation range is 4% or ±0.5KG, subject to the larger value of measurement.

3. Chemical composition deviation
Angle national acceptance standards in the chemical composition deviation refers to the chemical composition contained in the angle and the difference between the national standard requirements. Allowable range of chemical composition deviation is measured and tested in accordance with the requirements of national standards, and its allowable deviation is implemented in accordance with national standards.

The permissible deviations are intended to adjust for the effects of factors in manufacturing and processing. to ensure that the final angle product meets the requirements of national standards. These allowable deviations reduce uncertainty in the production process and help to ensure the conformity and reliability of the angle products.