SWRH 62B Wire Rod
SWRH 62B is a high-carbon wire rod per JIS G 3506 with 0.59-0.66% carbon. Diameter 5.5mm to 16mm, spheroidized annealed (HBW 190-260). Primary feedstock for high-strength spring wire, ACSR core wire, PC wire, and high-tensile wire ropes.
| Material | Carbon Steel (High Carbon Wire Rod) |
|---|---|
| Grade / Standard | SWRH 62B |
| Diameter | 5.5mm - 16mm (Nominal) |
| Delivery Condition | hot_rolled |
| Surface Treatment | coated |
| MOQ | 5 Tons |
| Delivery Time | 25-40 Days / In Stock |
| Loading Port | Tianjin / Shanghai / Qingdao |
Overview of SWRH 62B Wire Rod
SWRH 62B is a high-carbon wire rod grade specified under Japanese standard JIS G 3506 (High carbon steel wire rods), representing a premium raw material for high-strength spring wire and wire rope manufacturing globally. With a tightly controlled carbon content range of 0.59-0.66%, SWRH 62B wire rod is specifically engineered for applications demanding very high tensile strength, superior fatigue resistance, and excellent elastic properties after heat treatment. The grade designation ‘SWRH’ stands for Steel Wire Rod Hard, while ’62B’ indicates the approximate carbon content in hundredths of a percent, with ‘B’ denoting a boron addition for improved hardenability and austenite grain refinement.
SWRH 62B wire rod offers exceptional strength and wear resistance after proper heat treatment, with the ability to achieve tensile strength exceeding 2000 MPa in the final patented and drawn wire condition. The rod is typically supplied in spheroidized annealed condition with a hardness of 190-260 HBW, optimized for demanding wire drawing processes requiring significant cross-sectional reduction. After drawing and heat treatment (typically patenting), SWRH 62B produces wire with exceptional fatigue life, high yield strength, excellent wear resistance, and good dimensional stability under static and cyclic loading. The grade is the industry standard for high-strength spring wire, ACSR core wire, pre-stressed concrete (PC) wire, and high-performance wire ropes used in demanding industrial, automotive, and construction applications requiring superior strength and reliability.
Key Features and Manufacturing Process
SWRH 62B wire rod is manufactured through a precision continuous hot rolling process using high-quality steel billets with strictly controlled chemical composition. This is followed by controlled cooling (typically Stelmor process) and mandatory spheroidize annealing or patenting heat treatment to achieve the optimal microstructure for wire drawing. The spheroidizing treatment (heating to 680-740°C, holding, and slow cooling) transforms the lamellar pearlitic structure into spheroidized cementite in a ferrite matrix, reducing hardness to the 190-260 HBW range and significantly improving cold drawability despite the high carbon content.
The rod is supplied in a nominal diameter range from 5.5mm to 16mm, with the most common production sizes being 5.5mm, 6.5mm, 8.0mm, 10.0mm, 12.0mm, and 13.0mm for spring wire, wire rope, and PC strand drawing operations. Surface quality is critical, with strict requirements for surface decarburization depth (typically ≤0.5% of diameter for springs, or as agreed), freedom from seams, laps, and surface defects that could act as stress concentrators initiating fatigue failure or wire breaks during drawing. Standard coil weight ranges from 1.5 to 3 tons with an internal diameter of 850mm, optimized for high-speed multi-pass wire drawing lines. Each coil is supplied with comprehensive mill test documentation including complete chemical analysis, mechanical properties, microstructure verification (metallographic examination for spheroidization or patenting quality), surface decarburization depth measurement, and heat treatment certification ensuring compliance with stringent wire drawing industry requirements.
Main Applications of SWRH 62B Wire Rod
SWRH 62B wire rod serves as a critical raw material for high-strength automotive spring wire, particularly for clutch springs, heavy-duty suspension springs, and seat frame springs requiring tensile strength above 1800 MPa. The production of high-performance wire ropes for elevators, cranes, mining hoists, and cableway installations heavily relies on SWRH 62B for its excellent combination of high tensile strength and abrasion resistance in the final drawn wire.
Aluminum Conductor Steel Reinforced (ACSR) core wire production is a primary application for SWRH 62B, where the wire is drawn to fine diameters and must meet stringent strength and conductivity standards for overhead power transmission cables. Pre-stressed concrete wire and strand (PC wire) for railroad ties, poles, and large-scale construction projects use SWRH 62B drawn and stabilized wire to provide high tensile strength and low relaxation properties. Other applications include high-tensile industrial screens and meshes for quarrying and mining, music wire for high-fatigue mechanical springs in precision instruments, brush wire for industrial and automotive applications, and patented wire for severe cold heading applications like high-strength fasteners. After wire drawing and patenting, SWRH 62B produces premium rope and spring wire meeting stringent international specifications like EN 10270-1, BS 5216, and various ASTM standards for high-carbon wire.
Why Choose Us for SWRH 62B Wire Rod
Shandong Tanglu Metal Material Co., Ltd. supplies premium SWRH 62B wire rod sourced from leading Japanese-standard certified Chinese steel mills with state-of-the-art production facilities, precise chemical control systems, and comprehensive quality assurance programs specifically designed for high-carbon wire applications. Each coil undergoes mandatory chemical composition analysis with tight control of carbon, silicon, manganese, and critical residual elements, comprehensive mechanical property testing, metallographic examination to verify the microstructural condition (minimum spheroidization ratio or patenting quality), surface decarburization depth measurement using microscopic analysis, and dimensional verification per JIS G 3506 requirements, ensuring consistent wire drawing performance and final wire quality.
We offer a comprehensive diameter range from 5.5mm to 16mm in spheroidized annealed or controlled-cooled condition with flexible coil weight configurations from 1.5 to 3 tons, matching various downstream wire drawing line specifications. Special surface quality inspection ensures freedom from defects critical for fatigue-sensitive and high-tension applications. With a monthly supply capacity of 15,000 tons of wire rod and established export experience to over 50 countries serving spring manufacturers, wire rope mills, PC strand producers, and specialty wire drawers globally, we support both project orders and long-term supply contracts with consistent quality and stable pricing. Each shipment includes an original mill test certificate (MTC) conforming to EN 10204 3.1 standard with complete chemical analysis, mechanical properties, and microstructure verification, with EN 10204 3.2 independent certification and third-party inspection (SGS, BV, Intertek, TÜV, ALS) available for high-performance applications requiring enhanced quality assurance. Our SWRH 62B wire rod meets the stringent requirements of global wire manufacturers for consistent performance and reliability.
📐 Dimension & Size Table
| Diameter (mm) | Coil Weight (Ton) | Coil ID (mm) | Weight (kg/m) |
|---|---|---|---|
| 5.5 | 1.5 - 2.5 | 850 | 0.187 |
| 6.0 | 1.5 - 2.5 | 850 | 0.222 |
| 6.5 | 1.5 - 3.0 | 850 | 0.260 |
| 8.0 | 1.8 - 3.0 | 850 | 0.395 |
| 10.0 | 2.0 - 3.0 | 850 | 0.617 |
| 12.0 | 2.0 - 3.0 | 850 | 0.888 |
| 13.0 | 2.0 - 3.0 | 850 | 1.042 |
| 14.0 | 2.0 - 3.0 | 850 | 1.208 |
| 16.0 | 2.0 - 3.0 | 850 | 1.579 |
* Custom sizes available upon request. Tolerances per relevant international standards.
🔬 Chemical Composition
| Element | Min | Max | Display Value | Note |
|---|---|---|---|---|
| C | 0.59 | 0.66 | 0.59-0.66 | Per JIS G 3506 SWRH 62B |
| Si | 0.15 | 0.35 | 0.15-0.35 | Controlled for strength & deoxidation |
| Mn | 0.50 | 0.80 | 0.50-0.80 | |
| P | - | 0.030 | ≤0.030 | Strict control for high-carbon wire |
| S | - | 0.030 | ≤0.030 | Strict control for high-carbon wire |
| Cu | - | 0.25 | ≤0.25 | Residual element control |
| Cr | - | 0.20 | ≤0.20 | Unless intentionally added |
| Ni | - | 0.25 | ≤0.25 | Residual element control |
| B | 0.0005 | 0.0030 | 0.0005-0.0030 | Boron for hardenability & grain refinement (optional) |
| Al | - | 0.050 | ≤0.050 | Aluminum killed steel |
* Chemical composition may vary by heat, thickness and specification. Please refer to the actual mill test certificate.
⚙️ Mechanical Properties
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Spheroidized) | 600-750 | MPa | Spheroidized annealed condition |
| Brinell Hardness (Spheroidized) | 190-260 | HBW | After spheroidize annealing for drawability |
| Reduction of Area | ≥35 | % | Wire drawing capability indicator |
| Spheroidization Ratio | ≥90 | % | Metallographic requirement for optimal drawability |
| Surface Decarburization | ≤0.5 | % | Maximum depth as % of diameter (critical for high-tensile wire) |
| Tensile Strength (After Patenting & Drawing) | 1800-2150 | MPa | Final high-tensile wire after drawing and patenting |
| Spring Wire Hardness (Patented & Drawn) | 480-580 | HV | Typical hardness for high-strength spring wire |
| Wire Drawing Reduction | ≥85 | % | Total area reduction capability with inter-annealing |
| Torsion Test (Final Wire) | ≥20 | turns | For 2mm diameter rope wire (per typical specification) |
* Values shown are minimum requirements unless otherwise stated.
📦 Commercial Information
| Packaging | Standard seaworthy export packing for high-carbon wire rod. Compact coils with 4-6 heavy-duty steel strapping bands per coil to maintain shape during handling and sea transport. Each coil tagged with heat number, grade designation (SWRH 62B / JIS G 3506), nominal diameter, coil weight, heat treatment condition (spheroidized annealed/patented), and hardness range. Coils loaded with vertical eye orientation in container, separated by wooden battens and moisture barrier materials (VCI paper available) to prevent corrosion during transit. Standard coil dimensions: internal diameter 850mm, outer diameter 1250mm, height 800-1100mm depending on coil weight. Custom coil weight (1.0-3.5 tons) available to match specific downstream wire drawing line specifications and lifting capacity. |
|---|---|
| Payment Terms | T/T (Telegraphic Transfer),L/C (Letter of Credit),D/P (Documents against Payment),Western Union,PayPal |
| Price Term | FOB,CFR,CIF,EXW |
| Supply Capacity | 15,000 Tons/Month (Wire Rod All Grades) |
| Loading Port | Tianjin / Shanghai / Qingdao |
Why Choose Our SWRH 62B Wire Rod?
JIS G 3506 High-Carbon Quality
SWRH 62B wire rod is supplied with a comprehensive mill test certificate EN 10204 3.1/3.2 meeting JIS G 3506 requirements, including complete chemical analysis, mechanical properties, microstructure verification confirming ≥90% spheroidization ratio, surface decarburization depth measurement (≤0.5% diameter), and complete heat treatment certification, ensuring optimal wire drawing performance and final high-tensile wire quality.
Versatile High-Strength Wire Diameter Range
Diameter range from 5.5mm to 16mm in spheroidized annealed or controlled-cooled condition, covering all standard high-carbon wire drawing requirements. Common sizes include 5.5mm, 6.5mm, 8mm, and 10mm for ACSR core wire, PC wire, spring wire, and wire rope production.
Superior Strength and Fatigue Resistance
High carbon content of 0.59-0.66% with controlled silicon and optional boron addition provides exceptional strength and wear resistance. After wire drawing and patenting, it achieves a tensile strength of 1800-2150 MPa, meeting the stringent requirements of high-tensile rope, spring, and PC wire applications.
Stringent Quality Control for Critical Applications
Rigorous quality control includes strict P/S limits (≤0.030% each), tight surface decarburization control, and freedom from surface defects. Suitable for demanding applications with enhanced documentation and third-party inspection (SGS, BV, TÜV) available.
Global High-Carbon Wire Specialist
Extensive experience supplying SWRH 62B to global wire rope manufacturers, PC strand producers, high-tensile spring makers, and ACSR manufacturers. Monthly capacity of 15,000 tons with spheroidized annealed condition as standard, ensuring consistent drawability and final wire performance.
🏭 Applications of SWRH 62B Wire Rod
SWRH 62B wire rod is a critical feedstock for high-strength automotive spring wire, particularly for clutch springs, suspension springs, and seat frame springs requiring tensile strength above 1800 MPa. The production of high-performance wire ropes for elevators, cranes, mining hoists, and cableway installations heavily relies on SWRH 62B. ACSR core wire is a primary application, where the wire is drawn to fine diameters for overhead power transmission cables. Pre-stressed concrete wire and strand (PC wire) for railroad ties, poles, and large-scale construction projects use SWRH 62B drawn and stabilized wire. Other applications include high-tensile industrial screens and meshes for quarrying, music wire for high-fatigue mechanical springs, industrial brush wire, and patented wire for high-strength fasteners. After wire drawing and patenting, SWRH 62B produces premium rope and spring wire meeting stringent international specifications like EN 10270-1 and ASTM standards.
📋 Quality & Certification
Our Certifications
- ✅ ISO 9001:2015
- ✅ CE Marking
- ✅ ABS
- ✅ DNV GL
- ✅ Bureau Veritas (BV)
- ✅ SGS Certified
Mill Certificate Type
- 📋 EN 10204 3.1
- 📋 EN 10204 3.2
- 📋 Third Party Inspection Available
- 📋 Certificate of Origin
❓ Frequently Asked Questions
What is SWRH 62B wire rod?
SWRH 62B is a high-carbon wire rod grade specified under the Japanese standard JIS G 3506 with a carbon content range of 0.59-0.66%. The designation 'SWRH' stands for Steel Wire Rod Hard, indicating high-carbon content suitable for high-strength wire applications. SWRH 62B is specifically engineered for producing high-tensile spring wire, ACSR core wire, PC wire, and wire ropes. The rod is typically supplied in a spheroidized annealed condition with a hardness of 190-260 HBW, optimized for multi-pass wire drawing. After drawing and heat treatment (patenting), SWRH 62B produces wire with a tensile strength of 1800-2150 MPa, exceptional fatigue life, and high wear resistance for demanding applications.
What is the equivalent grade of SWRH 62B?
SWRH 62B has equivalent grades in multiple international standards: SAE 1065 and AISI 1065 (American standards with approximately 0.60-0.70% carbon), EN C66D / 1.0613 (European standard for high-carbon drawing quality), GB 65Mn (Chinese standard for high-carbon spring steel), DIN 1654 C67D (German standard), and ASTM A510 1065 (American specification for carbon steel wire rod). These grades share a similar chemical composition (approximately 0.59-0.70% C, 0.50-0.80% Mn, 0.15-0.35% Si) and are used for comparable high-strength wire applications. However, SWRH 62B per JIS G 3506 has particularly strict requirements for phosphorus and sulfur content (≤0.030% each) and surface decarburization depth, making it a premium grade for critical applications like ACSR core wire and high-tensile rope wire.
What is the difference between SWRH 62B and SWRH 42B wire rod?
The key difference is carbon content. SWRH 62B has a significantly higher carbon range (0.59-0.66%) compared to SWRH 42B (0.39-0.46%). This results in SWRH 62B achieving a much higher final tensile strength (1800-2150 MPa) after patenting and drawing versus SWRH 42B (1600-2000 MPa). Consequently, SWRH 62B is preferred for applications demanding maximum strength and wear resistance, such as wire ropes for cranes and elevators, ACSR core wire, and PC strand, where its superior strength-to-weight ratio is critical. SWRH 42B is more commonly used for automotive suspension and valve springs where a balance of high strength, fatigue life, and ductility is required. The spheroidized hardness of SWRH 62B is also higher (190-260 HBW vs. 170-230 HBW), making it slightly more challenging to draw but yielding a stronger final product.
Why is spheroidized annealing important for SWRH 62B?
Spheroidize annealing is crucial for SWRH 62B because its high carbon content (0.59-0.66%) results in a very hard and brittle microstructure (coarse pearlite) in the as-rolled condition. Drawing this material directly would cause wire breaks, excessive die wear, and poor quality. The annealing process (heating to 680-740°C and slow cooling) transforms the hard lamellar pearlite into a soft, spheroidized structure where cementite particles are dispersed in a ferrite matrix. This reduces hardness to 190-260 HBW and significantly improves ductility and cold drawability, enabling multi-pass wire drawing with total area reductions exceeding 85%. A minimum spheroidization ratio of 90% is a standard quality acceptance criterion to ensure consistent, problem-free drawing for demanding applications like fine ACSR wire.
What heat treatment is required to make high-strength wire from SWRH 62B?
The typical process to produce high-strength wire from SWRH 62B involves: (1) Mechanical or chemical descaling of the rod. (2) Multi-pass wire drawing with intermediate patenting heat treatments to restore ductility. Patenting involves austenitizing the wire at 920-980°C and then quenching it rapidly in a molten lead bath or fluidized bed at 500-550°C to form a very fine, uniform pearlitic structure. This patented structure provides the optimal combination of high tensile strength and ductility for further drawing. (3) Final drawing passes to achieve the desired diameter and final tensile strength (1800-2150 MPa). (4) For some applications like PC wire, a final stress-relieving (stabilization) heat treatment at 350-400°C may be applied. This process sequence is critical for meeting the demanding standards for high-tensile rope wire, ACSR core wire, and PC strand, ensuring high strength, good ductility, and torsional properties.
What are the typical applications of SWRH 62B wire?
SWRH 62B wire is a versatile high-strength material used in critical applications: (1) ACSR Core Wire: The primary choice for the steel core of Aluminum Conductor Steel Reinforced cables, providing the tensile strength for overhead power lines. (2) Wire Ropes: High-performance ropes for tower cranes, mining hoists, elevators, cableways, and marine applications requiring exceptional strength and abrasion resistance. (3) Pre-stressed Concrete (PC) Wire & Strand: Indented or smooth wire for railroad ties, concrete poles, pipes, and large building girders. (4) High-Strength Springs: Heavy-duty suspension, clutch, and seat springs for the automotive and railway industries. (5) Industrial Products: Music wire for precision instruments, high-tensile screens for mining and quarrying, and industrial brush wire. Its high strength-to-weight ratio makes it ideal where maximum load-bearing capacity with minimal material is required.
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