Carbon Structural Steel Bright Bar
Introduction:
Carbon structural steel bright bar is a high-precision, high-surface-quality finished steel product. Based on qualified carbon steel raw materials through EAF smelting and LF refining, it can be selectively finished by professional precision processes including cold drawing, centerless turning (peeling) and centerless grinding according to customer requirements.
Product Overview
Carbon structural steel bright bar is a high-precision, high-surface-quality finished steel product. Based on qualified carbon steel raw materials through EAF smelting and LF refining, it can be selectively finished by professional precision processes including cold drawing, centerless turning (peeling) and centerless grinding according to customer requirements. The bright bar features mirror smooth surface, no oxide scale, no scratches, precise dimensional tolerance and excellent straightness. It owns stable chemical composition, uniform mechanical properties, excellent cold and hot processing performance and good weldability. Covering full series of domestic and international mainstream grades such as Q195, Q215, Q235, Q275, 20#, 35#, 45#, 20Mn, 25Mn, 35Mn, 65Mn, C35, S45C, with diameter range of ø12–300 mm. It is widely applied to precision hardware, mechanical parts, automobile components and high-standard structural parts requiring high surface finish and accurate dimensions.
Representative Grades
|
Grade |
Standard |
Category |
Core Feature |
|
Q195 / Q215 / Q235 / Q275 |
GB/T 700 |
Ordinary carbon structural steel |
Low strength, superior plasticity & weldability |
|
20 / 35 / 45 / 20Mn / 25Mn / 35Mn / 65Mn |
GB/T 699 |
High-quality carbon structural steel |
Low impurity content, stable mechanical property |
|
C35 |
EN 10083 |
European carbon steel |
Equivalent to GB 35# |
|
S45C |
JIS G4051 |
Japanese carbon steel |
Equivalent to GB 45# |
Grade Description
-
01
Q series (Q195-Q275): Q = yield strength, figures refer to minimum yield strength value, mainly used for construction brackets, common fasteners, stamping parts.
-
02
Digital marks such as 20/35/45: The number represents average carbon mass fraction ×100; higher number means higher carbon content, higher strength and lower plasticity.
-
03
Mn series (20Mn/25Mn/35Mn): Added manganese element to improve hardenability and tensile strength, suitable for shaft, gear blank forgings.
-
04
65Mn: Medium-high carbon manganese spring carbon steel, good elasticity and fatigue resistance for small springs and elastic shims.
-
05
C35 / S45C: European and Japanese standard carbon steel, consistent mechanical performance for export machinery and auto spare parts.
Product Specifications
|
Item |
Detailed Parameters |
|
Product Form |
Hot rolled round steel bar;can supply peeled bright bar |
|
Diameter Range |
ø12 mm ~ ø300 mm |
|
Standard Length |
3m / 6m / 9m / 12m, customizable fixed cutting |
|
Delivery State |
Hot rolled black surface (AR); Annealed (A); Normalized (N) |
|
Dimensional Tolerance |
Comply with GB/T702, EN10060, JIS G4051 standard tolerance |
|
Surface Condition |
Mirror bright, oxide-free, scratch-free, burr-free, smooth finish |
Core Advantages
1. Flexible Optional Precision Processing: Three optional finishing processes are available according to demand: cold drawing for high dimensional accuracy, centerless turning (peeling) for removing surface defects and decarburized layer, centerless grinding for ultra-smooth mirror surface.
1. Flexible Optional Precision Processing: Three optional finishing processes are available according to demand: cold drawing for high dimensional accuracy, centerless turning (peeling) for removing surface defects and decarburized layer, centerless grinding for ultra-smooth mirror surface.
3. Stable Material Performance: Strictly control S and P harmful impurities, uniform internal grain structure, low segregation, stable hardness and mechanical properties in batches.
4. Full Grade & Size Coverage: Cover GB, EN, JIS standard grades and ø12–300mm full size range, suitable for various precision mechanical and hardware manufacturing scenarios.
5. High Cost Performance: Carbon steel material without expensive alloy elements, stable supply and short delivery cycle, ideal alternative to high-cost alloy steel for general precision parts.
6. High Assembly Accuracy: Ultra-tight tolerance and excellent straightness ensure smooth assembly and consistent finished product quality.
Main Application Fields
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Construction Industry
Q195/Q235 bright bars for high-precision embedded parts, anchor bolts, fine steel structure accessories and guardrail stamping parts.
-
Precision Hardware & Stamping
Q195/Q215 high-brightness bars for precision stamping shells, standard screws, nuts, pins and rivets.
-
Precision Mechanical Parts
20#/35#/45#/C35/S45C bright bars for motor shafts, pump shafts, precision gear blanks, connecting rods and mechanical fasteners.
-
Medium-strength Mechanical Components
20Mn/25Mn/35Mn precision bright bars for agricultural machinery parts, mining small shafts and heavy-duty bolt blanks.
-
Spring & Elastic Components
65Mn high-precision bright bars for small coil springs, spring washers and mechanical damping parts.
-
Auto & Export Parts
S45C/C35 bright bars for export automobile precision shafts, chassis structural parts and brake system accessories.
Packaging & Services
- 1. Professional Exclusive Packaging for Bright Bars: Adopts special scratch-proof and rust-proof precision packaging for bright bars, wrapped with thickened waterproof film on the outer layer and firmly bundled and fixed. High-precision and long-size products can be customized with solid wooden box packaging, completely avoiding collision, scratches, deformation and rust during transportation, suitable for long-distance sea and land transportation.
- 2. Complete Test Certificate: Provide EN10204 3.1 MTC mill test certificate, including chemical composition, tensile strength, hardness, bending and dimensional precision test reports.
- 3. Third-party Inspection Support: Accept SGS, BV and other authoritative third-party factory inspection and material certification.
- 4. Flexible Order Quantity: 1 ton minimum order quantity, mixed-grade and mixed-size container loading is supported.
- 5. One-stop Value-added Services: Optional cold drawing, centerless turning (peeling), centerless grinding, fixed-length cutting, stress-relief heat treatment, surface anti-rust treatment and UT ultrasonic flaw detection.
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Contact Us
- WhatsApp: +86-185 9567 2991
- Email: martinliu@rongtianmetal.com
- Tel: +86-185 9567 2991
- Address: 8F, Bldg 2, Jinke Zhihui Valley No. 65 Hongyuan Rd., Jinshui Dist. Zhengzhou, China.
