SparkX-Your Ideal Stainless Steel Square Bar Supplier
SparkX’s stainless steel square bar process routes include HRAP(hot rolled pickled), cold drawn bright, peeled/turned, and precision milled edges. We can stress relieve for tight tolerance machining, and the finish will be polished or coated to achieve the specified RA window. We support grades that include 303, 304/304L, 316/316L, 201/202, 430, 321, 410/420/431, 17-4PH, and 2205. Standards: ASTM A276/A479 A484, EN 10088-3, and each batch with EN 10204 3.1 material certification and seaworthy packaging.SparkX has 40 years of experience in stainless steel square bar R&D and supports highly customized products. Please send us your product specifications, and we will provide you with the best solution within 24 hours.
Common Grades of Stainless Steel Square Bars
If you have any other needs or require customization, please feel free to contact us.
Easy machining austenitic square bar for precision turning and fast production, with excellent machinability and corrosion resistance.
Widely used square bar has strong corrosion resistance and weldability, ideal for common fabrication, frames and machined parts.
Containing molybdenum, has good chloride and marine corrosion resistance, preferred for coastal, chemical and harsh environments.
High strength martensitic stainless steel with good corrosion resistance, commonly used for shafts, pumps, marine hardware and heavy load parts.
Precipitation-hardening square bar with high strength and good toughness, heat treatable for demanding aerospace and industrial parts.
Size, Squareness & Straightness of Stainless Steel Square Bars
The key to stainless steel square bars is geometric accuracy. Our edge lengths can reach h11/h10/h9 and straightness and parallelism are rechecked after drawing or milling. Typical straightness is ≤1.0mm/m and precision framers and key stock can agree on≤0.5mm/m. So our stainless steel square bar can be aligned faster, welds smaller, fits more stable and machining rework less.
Edge & Surface Options
When size is tolerant generally choose square edge as drawn/HRAP for manufacturing. It’s cost-efficient and less welding preparation. If you require geometric accuracy, clean and parallel edges you should choose milled edge. Milling can remove flanges and burrs, reduce assembly gaps, paint peeling and poor fit.Compared with shearing or flame cutting of stainless steel square bar, the milling edge has no heat affected zone and work hardening, tapping, drilling is smoother and the tool is more durable. For cosmetic parts, bright drawn give a cleaner base and we can lock an Ra window for later polishing or coating. Peeled and turned can remove scale, seams and decarb so the finishes won’t crack during bending or clamping. Optional corner radius and end deburr/chamfer improve stainless steel square bar safety and allow trouble free auto feeding
Heat Treatment & Grade Matching of Stainless Steel Square Bar
You can match the corresponding grade according to your processing and usage. 304 and 316 are solution annealed and rapidly cooled, so corrosion resistance and ductility are preserved, so when it bent or welded, there is no grain boundary sensitization.
410,420,431 are quenched and tempered to a hardness of 28-45 HRC, and controlled tempering avoids brittleness and reduces chatter for cleaner threads and more consistent tool life. 17-4PH is aged h900 for high strength(~1100 MPa UTS) or H1150 when toughness or weldability matter. 2205 is solution annealed the water quenched to prevent sigma phase embrittlement in chloride service. For the tight tolerances, we add stress relief so our stainless steel square bars don’t bow after heavy CNC passes. You can also choose other grades, but not limited to these, such as 303, 431, 17-4PH, and 2205. Please send us your requirements, and our team will provide you with a suitable solution within 24 hours.
Generally by grade, route (HRAP / bright-drawn / milled), size S*L, tolerance and straightness, edge/corner option, quantity, and packing/Incoterm. Please send your specification and destination, and we’ll quote in 24 hours with cost-down ideas (grade alternatives, milled vs square edge, optimized cut lengths).
Generally, we provide a range of S 4–80 mm, length 1–6 m. For fabrication, choose HRAP with a square edge. For precise assembly, pick milled edge with h10 or h9, for cosmetic parts select bright drawn with a defined Ra. We can advise on machining allowance and squareness based on your drawing.
Fixtures & frames (304/316), key stock (304/316 or 17-4PH for strength), machine bases & tables (304/316, stress-relieved), decorative trims (304 with HL/8K), marine hardware (316L), food & medical equipment (304/316L, passivated). Please share your environment, we’ll map grade + route + tolerance to your use.
