Common size on stock, Special sizes needs new production.Can cut to Size, Cut to Shape.
EMERSONMETAL
| Quantity: | |
|---|---|
Product Overview
The black finish refers to the as-rolled or lightly pickled surface with a dark oxide layer, suitable for further processing or non-exposed applications. The bright finish is achieved through additional cold drawing, peeling, or centerless grinding, producing a smooth, reflective surface ideal for precision machining, shafting, and decorative applications.
| Material Grade | Q195, Q235, Q275, SAE 1008, SAE 1010, SAE 1015, SAE 1020, S235JR, S275JR |
| Standards | GB/T 699, GB/T 700, ASTM A29, EN 10025, JIS G3101, DIN 17100 |
| Diameter Range | 3mm – 100mm (cold rolled / cold drawn) |
| Length | 3m – 12m (random or fixed length); cut-to-size available |
Manufacturing process:
Raw Material Selection: Usually choose high quality carbon steel, alloy steel or stainless steel.
Hot Rolling: Steel is heated and then shaped through rolls.
Cold Processing: Includes skinning (removing surface defects), cold drawing (stretching through a die to achieve precise dimensions), grinding or polishing.
Quality Inspection: Strict quality control ensures that each bar meets industry standards.
| Grade | Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation |
| Q195 / SAE 1008 | Cold Drawn | 315 – 430 | ≥195 | ≥33 |
| Q235 / SAE 1015 | Cold Drawn | 375 – 500 | ≥235 | ≥26 |
| S275JR / SAE 1020 | Cold Drawn | 410 – 550 | ≥275 | ≥21 |
Typical Applications
General Engineering: Pins, studs, bolts, nuts, washers, and fasteners
Q: What is the difference between cold rolled and cold drawn round bars?
A: Cold rolling is performed on bars with larger initial diameters using rollers to reduce size and improve surface finish. Cold drawing pulls the bar through a die, achieving tighter tolerances, smoother surfaces, and higher strength through work hardening. Bright finish bars are typically cold drawn. Both are produced at room temperature, unlike hot rolling.
Q: Can black round bars be used directly without further surface treatment?
A: Black bars are suitable for structural applications, welding, and forging where surface appearance is not critical. For precision machining, bearing fits, or decorative applications, bright finish bars are strongly recommended to avoid tool wear and ensure dimensional accuracy.
Q: What is the maximum diameter available in cold rolled bright finish?
A: Cold rolled and cold drawn bright bars are typically available up to 100mm diameter. For larger diameters (100mm–300mm), peeled or rough-turned bars are offered, which can then be centerless ground to achieve bright finish tolerances if required.
Q: What is your minimum order quantity (MOQ)？
A: Our standard MOQ is one metric ton per size and finish. For trial orders or mixed-size shipments, please contact us for flexible arrangements. Full container loads (approximately 25–28 metric tons) qualify for best per-kilogram pricing.
