Round Bar Hexagonal Bar Flat Bar Square Bar
Round Tube Angel Bar Square Tube
Product Stocking and Processing
Stainless Steel Bar & Wire
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Round Bar
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3.0 to 304.8mm
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Wire
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1.0 to 5.5mm
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Angle Bar
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20 to 100mm section; 3.0mm to 12.0mm thickness
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Flat bar
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12 to 150mm wide; 3 to 25mm thickness
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Channel Bar
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80 x 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness
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Hexagonal Bar
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6.35 to 63.5mm A/F
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Hollow Bar
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32mm OD x 16mm ID to 250mm OD x 200mm ID)
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Grades
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303, 304, 304L, 316, 316L, 321, 416, 431, 2205, 630, Improved Machining (303,304,316)
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Condition
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Hardened & tempered, annealed
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Finishes
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Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed
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Processing
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Bar cutting to 650mm
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Stainless Steel Bar
Stainless steel bar comprises numerous products referred to by the shape, the section dimension, grade, condition and surface finish.
Shapes and section dimension measurement
The following shows the variety of shapes commonly available in stainless steel bar and the dimensional designation for its shape
The following shows the variety of shapes commonly available in stainless steel bar and the dimensional designation for its shape
Round bar:
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Measured across the diameter.
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Square bar:
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Measured across the flats (AF).
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Hexagonal bar:
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Measured across the flats (AF).
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Flat bar:
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Measured width x thickness.
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Channels:
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Measured flange x web x thickness.
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Hollow bar:
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Measured outside diameter (OD) x inside diameter (ID).
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Common Stainless Steel Bar Grades
303
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Free-machining bar grades
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304, 304L
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Standard 18/8 grades
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316, 316L
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Improved resistance to pitting corrosion in chloride environments
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321
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Stabilised grades for heavy section welding and high temperature applications
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253MA
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High temperature resistant grade
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416
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Free-machining bar grade
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431
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High hardness and toughness grade, primarily for shafting
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2005
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Standard duplex stainless steel - high resistance to pitting and stress corrosion
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630
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(17-4PH) High strength shafting grade
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Condition
A post production operation where heat is used to achieve a desired hardness to suit the end use application
A post production operation where heat is used to achieve a desired hardness to suit the end use application
H&T
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Hardened and tempered.
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ANN
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Annealed
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PH
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Precipitation hardened.
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Surface finish
This is the surface condition of the bar, which is usually designated at the time of order. Generally this ranges from rough hot mill finished in the case of forging bar to very smooth centreless ground in the case of engineering component. bar.
This is the surface condition of the bar, which is usually designated at the time of order. Generally this ranges from rough hot mill finished in the case of forging bar to very smooth centreless ground in the case of engineering component. bar.
CD
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Cold drawn
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P
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Polished
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BD
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Bright drawn
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SRE
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Slit rolled edge
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CG
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Centreless ground
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HF
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Hot finished
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CF
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Cold finished
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HRAP
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Hot rolled annealed and pickled
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P&T
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Peeled and turned
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RT
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Rough turned/peeled
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ST
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Smooth turned
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PR
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Peeled and reeled
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Dimensional tolerances for bar
This is the product dimensional tolerance required by the end user and produced by the mill usually from the drawing, peeling or grinding process.
This is the product dimensional tolerance required by the end user and produced by the mill usually from the drawing, peeling or grinding process.
Forms and conditions: stainless steel bar
Round
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Square
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Hexagonal
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Precision ground
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Cold drawn
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Cold finished/smooth turned
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h8 or h9
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h9
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h10
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h11
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h11
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Stainless Steel Bar - Round
Stainless steel round bar besides having the characteristics or corrosions resistance has been developed over time to encapsulate end user applications. For example, Improved Machining (IM) grades have been developed to enhance machining of the steel into components, grades for hardness by responding to heat treatment and grades with high corrosion qualities by adding additional elements to give it the characteristics desired.
Atlas stocks a comprehensive range of grade, and sizes of stainless steel round bar to cover most machining and structural applications.
Product Stocking and Processing
Stainless Steel Round Bar
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Standard
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ASTM A276
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Condition
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25.4mm and less generally drawn, above 25.4mm and less than 101.6mm is generally annealed, turned and polished. Sizes above 101.6mm are generally rough turned to k12 tolerance. Grades 431 and 2205 are often stocked in a smooth turned or centreless ground finish.
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Size Range
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3 to 304.8 mm (diameter)
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Grades
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303, 304/304L, 316/316L, 431 H&T, 2205, Improved Machining (303, 304, 316)
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Processing
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Bar cutting
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Bar Grade Datasheets
Grade
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Description
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303
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303 grade represents the optimum in machining among the austenitic stainless steels. It is primarily used when production involves extensive machining. 303 is available in Improved Machining grade with machining characteristics significantly higher than that of the standard 303.
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304
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304 grade is dual certified as grade 304 and 304L. Grade 304 is the standard "18/8" stainless. It has excellent forming and welding characteristics. Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components. 304 is available in Improved Machining grade with machinability significantly higher than that of the standard 304.
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316
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316 grade is dual certified as grade 316 and 316L. 316 is the standard molybdenum-bearing stainless steel, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. It has excellent forming and welding characteristics. 316 is available in Improved Machining grade with machinability significantly higher than that of the standard 316.
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420
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420 grade can be hardened by quench-and-temper heat treatment. It contains a minimum of 12 per cent chromium, just sufficient to give corrosion resistance properties. It has good ductility in the annealed condition but is capable of being hardened up to Rockwell Hardness 50HRC, the highest hardness of the 12 per cent chromium grades. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished. 420 is available in Improved Machining grade with machinability significantly higher than that of the standard 420.
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431
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431 grade is a heat treatable martensitic, nickel-bearing grade has the best corrosion resistance properties of all the martensitic grades. It has excellent tensile and torque strength, and good toughness, making it ideally suited to shafting and bolt applications. It can be hardened to approximately 40HRC. Because of its high yield strength, this grade is not readily cold worked and is therefore not recommended for use in operations such as cold heading, bending, deep drawing or spinning. 431 is available as in Improved Machining grade with machinability significantly higher than that of the standard 431.
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2205
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2205 grade is the most widely used duplex (ferritic/austenitic) stainless steel grade. It finds applications due to both excellent corrosion resistance and high strength.
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UR52N+
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UR52N+ grade is one of a group of "super duplex" grades, combining high strength with exceptional corrosion resistance. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. UR52N+ is also very highly resistant to pitting/crevice corrosion in high chloride, hot environments. Its duplex structure also results in excellent resistance to stress corrosion cracking.
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Stainless Steel Bar Angle
Product Stocking and Processing
Stainless Steel Angle Bar
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Standard
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ASTM A276
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Condition
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HRAP
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Size Range
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20 x 20 mm to 100 x 100 mm
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Thickness
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3 to 12 mm (depending on size)
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Grades
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304, 316
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Processing
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Bar cutting
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Stainless Steel Bar Flat
Product Stocking and Processing
Stainless Steel Flat Bar
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Standard
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ASTM A276
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Condition
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HRAP or SRE
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Size Range
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Width 12 to 150 mm
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Thickness
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33 to 25 mm (depending on size)
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Grades
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304, 316
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Processing
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Bar cutting
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Stainless Steel Bar Channel
Product Stocking and Processing
Stainless Steel Channel Bar
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Standard
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ASTM A276
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Condition
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HRAP
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Size Range
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Base: 80 to 150 mm
Side: 40 to 75 mm |
Thickness
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5 to 6 mm (depending on size)
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Grades
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304, 316
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Processing
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Bar cutting
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Stainless Steel Bar Square
Product Stocking and Processing
Stainless Steel Square Bar
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Standard
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ASTM A276
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Condition
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Cold drawn
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Size Range
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6 to 76.2 mm (across the flat)
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Grades
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304, 316
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Processing
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Bar cutting
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Stainless Steel Bar Hexagonal
Product Stocking and Processing
Stainless Steel Hexagonal Bar
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Standard
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ASTM A276 and A582
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Condition
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Cold drawn
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Size Range
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Width 6.35 to 63.50 mm (across the flat)
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Grades
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304, 316, Improved Machining
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Processing
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Bar cutting
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Stainless Steel Bar and Wire Product Specifications
Stainless Steel Bar
Standard
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Description
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AS 2837
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Wrought alloy steels - stainless steel bars and semi-finished products.
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ASTM A276
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Stainless and heat resisting steel bars and shapes.
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ASTM A564/A564M
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Hot rolled and cold finished age-hardening stainless and heat resisting steel bars and shapes.
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ASTM A582
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Free machining stainless and heat resisting steel bars and hot rolled or cold finished.
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ASTM A193/A193M
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Alloy steels and stainless steel bolting materials for high temperature service.
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ASTM A194/A194M
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Carbon and alloy steel nuts for bolts for high pressure and high temperature service.
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ASTM A320/A320M
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Alloy steel bolting materials for low temperature service.
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ASTM A453/A453M
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Bolting materials, high temperature 345 to 827MPa yield strength with expansion co-efficients comparable to austenitic steels.
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ASTM A479/A479M
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Stainless and heat resisting steel bars and shapes for use in boilers and other pressure vessels.
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ASTM A484/A484M
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General requirements for stainless and heat resisting steel bars, billets and forgings.
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EN 10088-3
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Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods and sections for general purposes.
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Stainless Steel Hollow Bar
Standard
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Description
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ASTM A511
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Seamless stainless steel mechanical tubing.
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ASTM A450/A450M
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General requirements for carbon, ferritic alloy and austenitic alloy tubes.
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DIN 17 456
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General purpose seamless circular stainless steel tubes - ferritic and austenitic.
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