Cold Drawn Hexagonal Steel Bar

Tianjin Shunchen Industrial is a leading steel product manufacturer with 12 years of export experience, specializing in high-precision cold-finished steel products. Our production base in Tianjin is equipped with 6 fully automatic cold drawing units, precision straightening machines and ultrasonic flaw detection equipment, supported by a national-level material testing laboratory. We focus on R&D and production of cold drawn hexagonal steel bar, optimized for high-precision industrial processing scenarios.

Unlike ordinary hot-rolled hexagonal bars with large dimensional deviation, thick oxide scale and obvious surface defects, our products adopt multi-pass cold drawing process with standardized annealing treatment, forming a uniform and dense metal structure without surface oxidation. Our quality control engineer Zhao Jian, with 11 years of experience in cold-finished steel inspection, personally supervises full-process inspection of each batch, ensuring dimensional tolerance meets h11-h9 grade and straightness ≤0.5mm per meter. All products comply with GB, ASTM, EN and JIS standards, and can provide complete mill test certificates (MTC EN 10204 3.1) and third-party SGS inspection reports.

Real-world Performance Testing

1. Dimensional Accuracy & Surface Roughness Test

Test Standard: GB/T 3078-2008, ASTM A108

Test Samples: Ordinary hot-rolled hexagonal bar, Tianjin Shunchen cold-drawn hexagonal bar

Key Findings:

Ordinary hot-rolled bar: Across-flats tolerance ±0.40mm, surface roughness Ra 12.5μm, with visible oxide scale and slight burrs

Our product: Across-flats tolerance ±0.05mm (h11 grade), surface roughness Ra 1.6μm, bright and smooth surface without oxidation, reducing subsequent machining allowance by over 80%

2. Mechanical Property Uniformity Test

Test Method: Sampling from head, middle and tail of the same bar to test tensile strength and hardness

Test Results:

Ordinary hot-rolled bar: Tensile strength deviation ≥12%, hardness difference ≥8HB, uneven material performance

Our product: Tensile strength deviation ≤3%, hardness difference ≤2HB, uniform metallographic structure, stable performance for precision processing

3. Material Utilization Verification Test

Test Scenario: Processing standard hex bolts in a fastener factory

Test Results:

Using hot-rolled raw material: Material utilization rate 67%, requiring 2 turning processes

Using our cold-drawn raw material: Material utilization rate 93%, eliminating one turning process, reducing comprehensive processing cost by 35%

Real-world User Scenarios & Verified Cases

Case 1: High-Strength Fastener Manufacturing Project (Zhejiang Bosi Standard Parts Co., Ltd.)

Industry: Fastener manufacturing

Problem: The original hot-rolled hexagonal raw material had large dimensional deviation and rough surface, causing serious tool wear, low production efficiency and high material waste in bolt processing.

Solution: Adopt our 45# grade precision hexagonal bar (S24mm, h11 tolerance), with spheroidizing annealing treatment for better machinability.

Result: Cutting tool service life increased by 62%, single-piece processing efficiency improved by 40%, and material utilization rate rose from 67% to 93%. Annual purchase volume reaches 600 tons, with 4 years of steady cooperation.

Case 2: Automotive Hexagonal Sleeve Parts Project (Hebei Ruida Auto Parts Co., Ltd.)

Industry: Auto parts manufacturing

Problem: Previous raw materials had unstable dimensional accuracy, leading to 5.2% rejection rate of finished transmission sleeves, and secondary turning process prolonged production cycle.

Solution: Adopt our 40Cr grade high-precision hex bar (S19mm, h9 tolerance), with controlled decarburization layer and uniform hardness.

Result: Finished product rejection rate dropped from 5.2% to 0.8%, one turning process was completely eliminated, and annual processing cost saved over 1.2 million yuan. The product fully meets domestic and foreign automaker supporting standards.

Authentic Customer Reviews

"For auto parts processing, material stability directly determines product qualification rate. Their hexagonal bars have extremely small tolerance deviation, which has helped us reduce the rejection rate significantly and save a lot of processing costs. We are very satisfied with the quality."

—— Zhang Na, Procurement Manager, Hebei Ruida Auto Parts Co., Ltd.

"The hydraulic fittings we produce are exported to Europe, which have very strict requirements on material performance and flaw detection. Tianjin Shunchen's products have stable mechanical properties and complete testing certificates, which strongly support our export business."

—— Wang Tao, Technical Director, Jiangsu Hengli Engineering Machinery Co., Ltd.

Verified Product Parameters

(1) General Execution Standards

(2) Core Technical Parameters

(3) Chemical Composition (wt%)

(4) Mechanical Properties

Core Advantages

·  High Dimensional Precision, Lower Processing Cost: Dimensional tolerance reaches h11-h9 grade, reducing machining allowance by over 80%, effectively cutting tool loss and production cycle.

·  Bright Smooth Surface, Zero Oxide Defects: Precision cold drawing process delivers Ra≤1.6μm bright surface, no oxide scale, cracks or burrs, suitable for direct use in appearance parts.

·  Uniform Material Structure, Stable Performance: Controlled cold working and annealing process ensure uniform metallographic structure and mechanical properties, reducing product rejection rate.

·  Full-Process Quality Control, Traceable Quality: Full-batch ultrasonic flaw detection and dimensional full inspection, with 10-year senior engineer supervising the whole process, each batch with complete test report.

·  Complete Qualifications, Customized Solutions: ISO9001 certified, supporting customization of material, size, tolerance and heat treatment state, meeting diverse industrial needs.

Suitable For

Fastener manufacturing: High-strength bolts, nuts, screws, studs and other standard parts

Automotive parts: Transmission sleeves, connecting shafts, fasteners, chassis accessories

Engineering machinery: Hydraulic joints, pin shafts, support parts, equipment fasteners

Hardware tools: Wrenches, sockets, hand tools, hardware accessories

Precision machinery: Transmission shafts, guide rails, instrument precision components

Construction & decoration: Guardrail accessories, curtain wall connectors, steel structure fittings

Why Choose Tianjin Shunchen?

Looking for a reliable hexagonal steel bar supplier that can improve processing efficiency and reduce production costs? Choose Tianjin Shunchen Industrial — products verified by real manufacturing scenarios, manufactured by a professional Chinese steel factory with 12 years of export experience.

We maintain 3,000 tons of ready stock for standard specifications, supporting fast delivery within 3-7 days. Our professional technical team can provide customized solutions for material grade, size, tolerance and heat treatment according to your production needs. We adhere to the factory direct sales model, ensuring competitive prices and stable batch quality. Contact us now to get a free quote and sample!

Real Product & Shipment Gallery

Production & Quality Inspection

6 sets of fully automatic precision cold drawing units

Online ultrasonic flaw detection equipment (100% full inspection)

Digital hardness tester and coordinate measuring machine

Full-size precision caliper and micrometer inspection

Product Display

Bright finish cold drawn hexagonal bar (S12mm, 45# grade)

High-precision h9 tolerance hexagonal bar (S24mm, 40Cr grade)

Quenched and tempered hexagonal bar for mechanical parts

Custom cut-to-length bar with chamfering and drilling service

Shipment & Packaging

Standard export packaging (steel strapping, waterproof paper wrapping, rust-proof treatment)

Custom packaging with customer logo available

Container loading standard: 20ft container ≈22 tons; 40ft container ≈45 tons

Complete shipment documents (bill of lading, commercial invoice, MTC, third-party inspection report)

Customer Application

Zhejiang high-strength fastener production line

Hebei automotive sleeve parts processing project

Jiangsu engineering machinery hydraulic fitting project

Tianjin hardware tool manufacturing project

Popular Tags

cold drawn hex bar, precision hexagonal steel, bright steel bar, China cold drawn steel manufacturer, high tolerance hex steel, fastener raw material, structural steel bar, cold finished hexagonal bar

Related Categories

Steel Angle, Steel Channel, I-Beam, H-Beam, Steel Pipe, Steel Coil, Flat Bar, Round Bar, Square Bar, Steel Grating