6-500mm Black Stainless Steel Round Bar Raw Material With Dark Oxide Scale
black stainless steel round bar 500mm
,20ft stainless steel round bar stock
,hot rolled black stainless steel round bar
What is Stainless Steel Black Round Bar?
Stainless steel black bar is a hot-rolled round bar that has not undergone any surface finishing treatment. It retains the dark oxide scale (black or dark gray) formed during the hot rolling process. Black bars are the raw material for producing bright bars and are characterized by a rough, non-reflective surface and relatively loose dimensional tolerances.
Why Choose Stainless Steel Black Bar?
Black bars are the most economical form of stainless steel round bar. They are ideal for applications where surface appearance and tight tolerances are not critical. Black bars serve as the standard feedstock for cold drawing, peeling, and grinding processes, and are suitable for general industrial components, structural supports, and forging applications where cost efficiency is a priority.
Process Overview
Stainless steel black bar is produced through hot rolling. Stainless steel billets are heated to high temperatures and passed through rolling mills to achieve the desired diameter. After rolling, the bars are cooled, straightened, and cut to length. The surface is left as-rolled, with the natural oxide scale intact. No pickling, polishing, or further finishing is applied at this stage.
201, 430, 304, 304L, 316, 316L, 310S, 317, 317L, 321, 904L, 2205, 2507, etc.
| Industry | Applications |
|---|---|
| Raw Material | Feedstock for cold drawing, peeling, or grinding to produce bright bars |
| Industrial | General machinery components, structural supports, frames |
| Forging | Billets for forged parts and components |
| Construction | Buried or concealed structural elements |
| Machining | Parts that will be subsequently machined, coated, or finished |
| Petrochemical | Non-visible support structures and brackets |
Stainless steel can be magnetic depending on its internal structure. Austenitic grades like 304 and 316 are normally non-magnetic, but ferritic (430) and martensitic (410) grades are magnetic due to their different crystal structure. Even 304 or 316 may become slightly magnetic after cold working such as bending or stamping, which transforms some austenite into martensite. Therefore, magnetism does not indicate quality — it simply reflects the steel's microstructure and processing history.
For standard materials and sizes held in stock, delivery is guaranteed within 3 days of payment receipt. For products requiring custom dimensions or surface finishes, the lead time is 7 to 15 working days after payment confirmation. Specific delivery schedules should be confirmed with customer service at the time of order placement.
A substantial inventory is maintained to ensure prompt delivery. Stock availability varies by material grade and dimensions. To avoid potential delays, please confirm current stock levels with your sales representative prior to placing an order.
Applicable product standards must be specified at the time of order. For projects with specific technical requirements, please provide detailed parameters, tolerance ranges, and other relevant specifications. A dedicated quality inspection department oversees all stages of production to ensure full compliance. Upon completion, accurate measurements, inspection images, video documentation, and material test reports are provided for customer confirmation.
Complimentary samples are available in any size; however, international shipping fees apply. These charges are deductible from future order payments following formal cooperation. Customized samples are also available for a fee. For further details, please consult your sales representative.
Custom markings on outer packaging are available upon request at no additional cost. Once the marking design is approved, it will be affixed using waterproof tape. If no specific marking is requested, packaging will be shipped without markings by default.
Material grade, dimensions, and other identifying information may be spray-marked directly onto the steel plate surface upon request. For applicable charges, please consult your sales representative.
Standard wooden pallet packaging is provided at no extra cost, with a loading capacity of 1 to 3 tons per pallet. Alternative packaging options, such as iron pallets, are available upon request. Please contact your sales representative for details — bulk orders qualify for preferential pricing.
We maintain partnerships with multiple freight forwarders to offer competitive land, air, and sea freight options. If you have a preferred freight forwarder, we can arrange delivery to your agent's warehouse or to the designated port of shipment.
Factory inspections and product inspections are fully supported. Customers are welcome to visit our facility for in-person inspections. Alternatively, third-party inspection agencies, including SGS, may be arranged to conduct on‑site inspections.
