Bright Steel Bar
As a dedicated Chinese manufacturer, JIYUAN Steel delivers cold-drawn, peeled, and polished steel bars that meet the most stringent international standards for dimensional accuracy and surface finish.
What is Bright Steel Bar?
Bright steel bars are a cornerstone material in precision engineering, distinguished by their smooth, bright surface and tight dimensional tolerances. Unlike hot-rolled steel, our bright bars undergo a secondary cold-working process—primarily Cold Drawing, Peeling, or Grinding—to achieve superior mechanical properties and surface quality.
Exceptional Dimensional Accuracy
Achieved through cold working, ensuring minimal variation and maximum compatibility with automated machinery. Tolerances conform to BS EN 10278 and ISO 683-18 standards.
Superior Surface Finish
The bright, scale-free surface reduces friction and eliminates the need for pre-machining, saving time and cost in your production process.
Enhanced Mechanical Properties
Cold drawing increases tensile strength and yield strength, making the material ideal for critical, high-stress components in demanding applications.
Improved Machinability
The refined microstructure allows for faster cutting speeds and longer tool life in CNC and automatic lathe applications, reducing production costs.
Comprehensive Grade & Size Range
CHINASPECSTEEL™ supplies a comprehensive range of bright steel grades, catering to diverse engineering requirements across the globe. Our inventory covers standard structural steels, case-hardening grades, and high-strength alloy steels.
| Steel Grade | International Equivalent | Key Characteristics | Primary Applications |
| Q235 | S235JR (EN) | General purpose structural steel, excellent weldability and formability | Construction, General Fabrication, Non-critical machine parts |
| 20# | 1020 (AISI/SAE) | Low carbon, case-hardening steel with good core strength and toughness | Pins, Shafts, Gears, Automotive Components |
| 45# | C45 / 1045 (EN/AISI) | Medium carbon steel, good strength and hardness after heat treatment | Axles, Crankshafts, Connecting Rods, Machine Tool Parts |
| 40Cr | 5140 (AISI), 41Cr4 (EN) | Chromium alloy steel, high strength and wear resistance, good hardenability | Heavy-duty shafts, Forgings, Highly stressed machine components |
| 42CrMo | 4140 (AISI), 42CrMo4 (EN) | High-strength alloy steel, excellent toughness and fatigue resistance | High-pressure vessels, Hydraulic components, Precision tooling |
Adherence to International Standards
Our manufacturing processes are strictly governed by internationally recognized quality and technical standards, ensuring product reliability for every shipment. Every bar undergoes rigorous testing to validate material properties and structural integrity.
Key Standards Compliance
- Dimensional Tolerance: BS EN 10278 and ISO 683-18
- Material Specification: ASTM A108 and EN 10277
- Quality Management: ISO 9001:2015 Certified
- Typical Tolerances: h9, h10, h11 range
Quality Assurance Process
- Ultrasonic Testing for internal defects
- Eddy Current Testing for surface cracks
- Mechanical Testing (Tensile, Yield, Elongation, Hardness)
- Mill Test Certificate (MTC) 3.1 provided with every order
Customized Processing & Value-Added Services
Beyond standard supply, CHINASPECSTEEL™ offers a suite of value-added services to deliver parts ready for your production line, reducing your manufacturing complexity and lead time.
Precision Cutting
Saw cutting to exact customer-specified lengths, minimizing waste and ensuring perfect fit for your assembly requirements.
Heat Treatment
Full range of services including Annealing, Normalizing, Quenching, and Tempering to achieve required hardness and microstructure.
Surface Treatment
Secondary grinding and polishing for ultra-smooth finishes, ideal for chrome plating applications and aesthetic requirements.
Chamfering & End Work
Custom end preparation for specific assembly requirements, reducing your secondary processing costs.
Straightening
Rotary and roll straightening to achieve straightness tolerances within ±0.5mm per meter, meeting precision requirements.
Packaging & Logistics
Professional packaging for export, with options for FOB, CIF, and DDP delivery terms to your destination port.
Engineering Excellence: Where Our Steel Performs
Our bright steel bars are the material of choice for demanding industries worldwide, trusted by manufacturers for critical applications requiring precision and reliability.
Automotive & Transportation
Drive shafts, steering components, fasteners, and suspension parts. Our 45# and 40Cr grades are industry standard for crankshafts and connecting rods in high-performance engines.
Hydraulics & Pneumatics
Piston rods, cylinder shafts, and actuator components. 42CrMo4 bright bars deliver the fatigue resistance required for high-pressure systems operating in demanding environments.
Machine Tools & Precision Engineering
Spindles, lead screws, precision guides, and tooling components. Our tight tolerances and superior surface finish ensure optimal performance in CNC and automated manufacturing.
General Engineering & Manufacturing
Pump shafts, motor shafts, bushings, and structural components. Q235 and 20# grades provide cost-effective solutions for general industrial applications.
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