Overview
Full hard spring wire is a cold-drawn, high-carbon steel wire processed to achieve maximum tensile strength and minimal ductility. It is a preferred material for applications requiring high load-bearing capacity and resistance to deformation, such as automotive suspensions, industrial machinery, and consumer electronics. The wire undergoes rigorous drawing and heat treatment to eliminate internal stresses, ensuring uniform mechanical properties. Its hardness is classified as 'full hard' (FH) under ASTM standards, indicating near-zero elongation under stress, making it unsuitable for further bending or shaping post-production.
Structure and Working Principle
The wire's microstructure consists of fine pearlite and cementite phases due to its high carbon content and cold-working process. This grants it superior yield strength and elastic modulus, enabling springs made from it to return to their original shape after repeated compression or tension. Unlike annealed wires, full hard wire skips the final softening stage, retaining its hardened state. This makes it ideal for pre-stressed components where plastic deformation must be avoided. Its working principle relies on Hooke's law, with linear elasticity up to its yield point.
Key Features
1. **High Tensile Strength**: Ranges from 1,700 to 2,200 MPa, outperforming medium-carbon wires. 2. **Low Relaxation**: Maintains tension over time, critical for long-term applications like mattress springs. 3. **Surface Quality**: Available in bright (uncoated), galvanized, or oiled finishes to resist corrosion. Manufacturers often customize diameter (0.1–6.0 mm) and tolerances (±0.02 mm) to meet specific design requirements. The wire's brittleness necessitates careful handling during coiling or welding.
Application Areas
1. **Automotive**: Valve springs, clutch springs, and suspension components. 2. **Industrial**: Conveyor belts, agricultural machinery parts, and pneumatic tools. 3. **Consumer Goods**: Retractable pens, trampolines, and electrical contacts. Its durability also suits medical devices (e.g., surgical tools) and aerospace fasteners, where reliability under stress is paramount. B2B buyers should specify application-specific certifications like ISO 8458-2 or SAE J178 for quality assurance.
Maintenance and Precautions
Store full hard spring wire in dry, temperature-controlled environments to prevent rust. Avoid exposure to acids or chlorides, which can accelerate corrosion, especially in uncoated variants. During fabrication, use tungsten carbide dies to minimize wear and maintain dimensional accuracy. Post-production stress relief annealing (if required) should be performed below 300°C to retain hardness. Always wear cut-resistant gloves when handling to prevent injury from sharp edges.
B2B Procurement Guide
1. **Supplier Verification**: Prioritize mills with ISO 9001 certification and batch-testing reports. 2. **Cost Factors**: Prices fluctuate with steel scrap markets; bulk orders (20+ tons) often secure 5–10% discounts. 3. **Logistics**: Coiled wire typically ships on wooden spools (500–2,000 kg capacity); confirm freight charges for oversized loads. For specialized needs (e.g., music wire grades), request samples to test fatigue resistance via cyclic loading trials. Lead times average 4–6 weeks for custom diameters.
Related Manufacturers
- 主营：铬锆铜、黄铜排、磷铜皮、SUS316不锈钢线、磷铜丝、铍铜箔、紫铜带、铜合金材料、铝合金材料、304不锈钢带、H59黄铜板、C1100紫铜板、铝青铜板、C18150铬锆铜板、C5210磷铜板、锡青铜板、TA1纯钛板、T2紫铜板、H65黄铜带、洋白铜带、301不锈钢板、316不锈钢带、H65黄铜管、无氧铜管、304不锈钢管、1100纯铝带
- 主营：不锈钢丝、201不锈钢丝、304不锈钢丝、不锈钢线材、不锈钢弹簧丝、不锈钢绞线、不锈钢线、不锈钢光亮丝、不锈钢软丝、316不锈钢、不锈钢微丝、框架护栏网、防护栏、公路防护网
- 主营：黄铜管、纯锌棒、铍铜箔、紫铜线、黄铜线、紫铜带、白铜箔、铍铜带、钨铜板、磷铜丝、T2紫铜板加工、H65黄铜板、C7701白铜板、黄铜棒加工、C17200铍铜板、无氧铜板、特硬不锈钢带、铜垫片加工、C5191磷铜板、316不锈钢板、H65黄铜管、镜面铜板、301不锈钢带、7075铝棒
- 主营：钢丝绳、压制钢丝绳、狼山钢丝绳、虎头紧线器、插编钢丝绳、吊篮用钢丝绳、涂塑钢丝绳、镀锌钢丝绳、电梯钢丝绳、不锈钢丝绳、钢丝绳套、吊装索具
- 主营：模具钢、合金钢、高速钢、SUS304不锈钢线、优特钢、锰钢、镁合金、钛材、铜材、不锈钢、铝合金、高速粉末钢、透气钢
- 主营：模具钢、镁合金板、钢板硬料、弹簧钢带、透气钢板、刀具钢板、ld圆钢圆棒、粉末高速钢
- 主营：黄铜管、磷铜棒、磷铜带、磷铜线、铜线、铝线、黄铜线、黄铜板、黄铜带、铜板、铜棒、铜管、铜带、铝带、铝管、铝板、垫片、不锈钢带、不锈钢管、不锈钢棒、铍铜、镍带、铝棒、紫铜管、黄铜棒
- 主营：抛光棒、仪表管、空心管、253MA不锈钢线材、消音器、刀具钢、不锈棒、镜面板、合金钢、抛光管、制品管、无缝管、磨砂面、刀具料、退火管、厚壁管、花纹板、特硬带、卡套管、中厚板、光圆钢、拉丝板、气路管、气源管、车光棒、打包带
- 主营：H59黄铜管 厚壁、H62 H65黄铜管、薄壁铜管零切、H62 H65黄铜线、大直径铜管零切定制、6061铝管零切、6063铝棒切割加工、铝青铜棒零切定制、H59 H62黄铜棒、H65黄铜棒 无铅铜、T1紫铜棒零切、T2紫铜棒切割加工、H62 H65黄铜板、T1 T2紫铜带、T1 T2紫铜板、T1 T2紫铜排、T1 T2紫铜管、无缝铜管定制加工、铜板镜面贴膜、打孔折弯加工定制、无氧铜 红铜、无铅黄铜棒
- 主营：Q235线材、nm360耐磨钢板
- 主营：圆钢、高速钢、模具钢、不锈钢螺丝线、不锈钢、钛合金、铝合金、镁合金
- 主营：铝棒、铝板、铝管、铜线、铜棒、钨铜、纯钨、钼合金、钛合金、高温合金
- 主营：7075铝棒、氧化铝铜棒、T2紫铜片、紫铜线标准、C7701白铜板、H62黄铜板、耐磨锡青铜板、H65黄铜管、T2紫铜毛细管、301不锈钢带、6061铝合金管、纯铝带、5052铝带、角铝型材、6061T6铝板、镜面铜板、特硬不锈钢带、T2紫铜棒、c5191磷铜板、H65黄铜带、T2紫铜带、C5191磷铜、洋白铜箔、无缝铝管、无磁不锈钢带、H65黄铜棒
- 主营：TU2无氧铜棒、C1020无氧铜管、国标6063铝管、3003铆钉铝线、5052铝合金线、C10200无氧铜线、6063铝合金线、7075铝棒、7075无缝铝管、2A12铝棒、2011铝棒、6061六角铝棒、6061铝棒、6082-T6铝棒、T2紫铜板、C10100无氧铜板、无铅H65黄铜管、H62黄铜毛细管、H62黄铜棒、H65黄铜棒、H59无铅黄铜棒、国标6061T6铝板、光亮H65黄铜板、3003铝合金棒
- 主营：H65黄铜管、国标黄铜棒、6063铝合金管、6061铝合金线、5052铝镁合金线、C10200无氧铜线、无铅H65黄铜线、7075铝棒、T2紫铜棒、TU2无氧铜板、精抽2011铝合金棒、C1100紫铜板、6061六角铝棒、H62/H65黄铜棒、7075无缝铝管、2A12铝棒、C3604黄铜管、C14500碲铜棒、C18120铬锆铜棒、C5191磷铜棒、C54400易车磷铜、QSn9-4铝青铜、高精H65黄铜板、3003铝合金棒、6082-T6铝棒