Oil Tempered Spring Wire

Oil-tempered spring wire is a high-carbon steel wire that undergoes an oil-quenched and tempered heat treatment, resulting in high strength, toughness, and excellent fatigue resistance. Commonly used in springs, fasteners, and wire ropes in the automotive, industrial, and construction industries, it offers low residual stress and is extremely durable and reliable. Wanzhi Steel is a professional oil-tempered spring wire manufacturer, exporting to global B-end customers at factory prices. We stock a wide variety of common specifications. If you are interested, please contact us.

Specification

Item	Oil-tempered spring wire
Place of Origin	Hebei, China
Standard	AISI, ASTM, BS, DIN, JIS, GB, EN
Delivery Time	8-14 days
Technique	Hard Drawn
Aliases	Hard Drawn Wire & spring steel wire&piano wire
Tensile Strength	850-1050Mpa
Surface Treatment	Black, with oil
Color	Charcoal black, and silver after galvanizing
Sample	Free Available
Payment term	TT 30% Advance + 70% Balance
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Standard export packaging
Certification	ISO 9001, SGS, ABS, BV
MOQ	5 tons

Key Benefits

What grades are available for oil tempered steel wire?

• Grade A: Low strength, excellent toughness and ductility, and easy to form. Typical grades include SWRH62A and SWRH67A.
• Grade B: Medium strength, balanced strength, and toughness. Typical grades include SWRH72A and SWRH77A.
• Grade C: High strength, good fatigue performance. Typical grades include SWRH82B and 60Si2MnA.
• Grade D: Ultra-high strength, with extremely high fatigue life requirements. Typical grades include 55CrSiA and SUP12.

 

How to Choose?

• Determine the operating conditions: First, clarify the operating stress, fatigue life requirements, whether the operating environment is corrosive, and the temperature.
• Select the material: Choose carbon steel or alloy steel based on performance and cost.
• Confirm the specifications: Finalize the wire diameter, strength range, and grade.

For example, when designing a suspension spring for a standard car, you might choose 60Si2MnA, grade B or C. However, when designing valve springs for an F1 engine, you would undoubtedly choose 55CrSiA, grade D.

Application Areas

Spring manufacturing

Automobile engine valve springs, suspension springs, clutch springs, industrial machinery springs, shock absorber springs, precision springs with high stress and high fatigue requirements, impact drills, and electric saw reset springs.

Wire rope

Mine hoisting wire ropes, ropes for large cranes, load-bearing ropes for cable cars and ropeways, high-strength traction ropes, and ropes for fishing.

Fastener

High-strength bolts, studs, connecting rods, and other high-grade fasteners used in critical connections.

Industry

Knives, wheelbarrow wire, sports equipment accessories, high stress parts for agricultural machinery.

Recommended uses at different grades

• Grade A: Furniture springs, low-stress retaining rings or springs, etc.
• Grade B: General-purpose mechanical springs, automotive clutch springs, general suspension springs, etc.
• Grade C: Engine valve springs, high-stress suspension springs.
• Grade D: Top-grade valve springs, extremely heavy-duty suspension springs.

What is oil tempered spring wire?

What is Oil Tempering?

Oil tempering is a combined heat treatment process involving oil quenching and tempering at a moderate temperature, designed to achieve an optimal balance of high strength, high toughness, and exceptional fatigue resistance in steel wire. It is the standard process for producing top-quality spring steel wire. For example, “Oil Tempered Spring Wire” is a product that undergoes this process.

 

Oil tempered spring wire definition

Spring wire, also known as piano wire or Music wire.Oil-tempered spring wire is a spring steel wire manufactured through a specialized process. High-carbon steel or alloy steel wire is first quenched and then tempered in oil. This results in high elasticity, high tensile strength, and good toughness, allowing it to withstand repeated loads and resist deformation. It is widely used in the manufacture of automotive suspension springs, mechanical springs, and other applications requiring high spring performance, making it a commonly used spring raw material in the industrial sector.

 

Table of Music Wire Properties

Nominal Analysis	C – .70 – 1.00% Mn. – .20 -60%
Minimum Tensile Strength	230*10^3 – 399*10^3
Modulus of Elasticity	30*10^6
Design Stress % Minimum Tensile	45%
Modulus in Torsion	11.5
Maximum Temperature	250º F (121º C)
Rockwell Hardness	C41-60
Method of Manufacture Chief Uses Special Properties	Cold drawn. High and uniform tensile. High quality springs and wire forms.

 

Our music wire conforms to the latest revision of ASTM A228/A228M-16.

• Type I: The wire shall be drawn directly from rolled bar or air-annealed bar or wire to the final diameter.
• Type II: The wire shall be drawn from annealed bar or wire to the final diameter. Any annealing treatment is not permitted.

Oil tempered spring wire VS. ordinary spring steel wire

Features	Oil Tempered Spring Wire	Ordinary spring steel wire (such as hard-drawn steel wire)
Processing	Oil quenching + tempering heat treatment	Cold-drawn, no heat treatment
Strength and Toughness	Very high and well balanced	High strength, but poor toughness
Fatigue Resistance	Excellent, suitable for dynamic high-frequency loads	Poor, prone to fatigue fracture
Cost	Higher	Lower
Applications	High-performance, safety-critical areas	Low load ordinary spring

Manufacturing Process

• Raw Materials: High-carbon steel such as 65# or 70# steel or alloy spring steel such as 50CrVA wire rod is used.
• Pretreatment: Surface scale and oil are removed, followed by a “pickling-phosphating-saponification” treatment to form a lubricating film.
• Drawing: Multiple cold drawing passes are performed to gradually reduce the wire diameter to the target specification, while simultaneously cold-working and hardening the wire.
• Quenching: The wire is then heated to the Ac3 (austenitizing temperature) of 850-950°C, held at this temperature for a specified period, and then rapidly cooled.
• Oil Tempering: The wire is then placed in engine oil at 250-500°C for tempering.
• Post-Processing: Surface finishing such as polishing and rust prevention can be performed. Galvanizing and phosphating can also be performed as needed. Finally, the wire is cut and coiled to form the finished product.

Packaging Method

• Reel/IBC Packaging: The most common and standard packaging method. Steel wire is wound around a metal or wooden I-shaped reel.
• Coil/Ring Packaging: Steel wire is rolled into a ring-shaped coil and then secured with steel strapping or rope.

Oil Tempered Spring Wire Supplier- Wanzhi Steel

In summary, while the initial cost may be higher, oil-tempered spring steel wire offers unparalleled value by reducing failure rates, minimizing downtime, and extending product lifecycles. It represents a strategic investment in the quality and reliability of automotive, industrial, and safety-critical components. Wanzhi Steel offers a comprehensive range of diameters and grades, guaranteeing full traceability and consistent quality.

Competitive quotes are customized based on your usage. Partner with us for reliability you can trust.

 

Get samples or a bulk quote! Chat with Us Online,

or send an email to: info03@wanzhisteel.com.

 

Wanzhi Steel is an ISO 9001 certified steel mill located in Hebei Province, China. The company specializes in the production of GI wire, galfan wire, SS steel wire, zinc aluminum alloy wire, annealed wire, low carbon iron wire, binding wire, and baling wire. With 14 years of experience, the monthly output reaches 1,800 tons. With high-quality products and good services, the company’s products have been exported to more than 120 countries around the world.

 

 

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