SPRING STEEL
High Yield Strength & Resilience Steel Bars, Wire Rods, Strips, Plates & Industrial Spring Grades
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High Resilience & Elasticity
Superior Hardness & Durability
High Fatigue & Wear Resistance
Excellent Yield Strength
High Corrosion Resistance
Ready Stock
SPRING STEEL SUPPLIER IN MUMBAI
Steel alloys are the most commonly used spring materials. The most popular alloys include high-carbon (such as the music wire used for guitar strings), oil-tempered low-carbon, chrome silicon, chrome vanadium, and stainless steel. The term yield strength refers to a material’s ability to endure significant bending or twisting and return to its original shape without deforming. Spring steel stock alloys typically include silicone in their composition and are hardened and cold rolled after casting to improve yield strength. Spring steel products are generally either cold drawn as wire or punched from flat stock. Typical uses include saw blades, tape measures, helical springs, and vehicle suspension elements.
- Resilience: Spring steel is highly resilient and can return to its original shapes after being bent or stretched.
- Hardness and Durability: Spring steel can support heavy loads without breaking. Additionally, it can withstand weather and wear over a long period of time.
- Elasticity: Spring steel can be formed, shaped, and post-heat treated without losing its shape.
- Corrosion Resistance: With high corrosion resistance, spring steel is well-suited for use in harsh conditions.
- Clips & Fasteners: With high-strength and good fatigue resistance, spring steel is ideal for creating clips and fasteners that hold things together.
- Springs: From everyday machinery to vehicular parts, spring steel is most commonly used to create coil springs, compression springs, torsion springs, and leaf springs.
- Medical Equipment: Spring steel is often used to create medical instruments, like surgical tools and orthodontic appliances.
- Machinery: Used for manufacturing machinery and equipment, from lawnmowers and aircrafts to conveyers and pumps.
- Hand Tools: Perfect for producing strong, durable tools like pliers, wrenches, and scissors.
ROUND BARS
HEXAGONAL BARS
PLATES & SHEETS
SPRING GRADES CLASSIFICATION
CATEGORIES OF SPRING STEEL
Spring steels are categorized by chemical composition and heat-treatment characteristics into Carbon Spring Steels, Alloy Spring Steels, and Stainless/Specialty Spring Steels.
HIGH CARBON & SILICON SPRING STEEL
- Grades EN 9, EN 42J, C 60-65, C 70-75, C 80-85, 55Si7
- High Elastic Recovery & Yield Strength
- Saw Blades, Tape Measures & Music Wires
- Cost-Effective General Engineering Springs
CHROME-VANADIUM ALLOY SPRING STEEL
- Grades EN 45, EN 47, EN 48A, SAE 5160, SUP 9, 31CrV3, 50CrV4, 60CrV4
- Superior Fatigue Strength & Toughness
- Automobile Leaf Springs, Heavy Coil Springs & Torsion Bars
- High Load Carrying Capacity Under Cyclic Stress
STAINLESS & SPECIALTY SPRING STEEL
- Grades AISI 304, AISI 316, AISI 410, AISI 420
- High Corrosion Resistance in Harsh Environments
- Medical Instruments, Orthodontic Tools & Marine Fasteners
- Heat-Resistant Precision Electronics Springs
INDUSTRIAL ADAPTABILITY
APPLICATIONS OF SPRING STEEL
Spring steel is engineered for demanding elastic recovery, high fatigue life, and heavy load resistance across diverse industries.
VEHICLE SUSPENSION (Leaf & Coil)
CLIPS & FASTENERS
MEDICAL & SURGICAL TOOLS
HAND TOOLS & PLIERS
MACHINERY & PUMPS
SAW BLADES & TAPE MEASURES
AEROSPACE COMPONENTS
PRECISION SCISSORS & BLADES
GRADE FINDER
SPRING STEEL GRADES AVAILABLE
Use the options below to filter by standards, search specific spring steel grades, and request quick rates.
DATA SHEET
TECHNICAL INFORMATION
Detailed metallurgical specifications, chemical compositions, mechanical properties, and available sizes of our spring steel products.
Typical chemical compositions of prominent Spring Steel grades supplied by Steel Mart:
| Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Chromium (Cr) | Vanadium (V) |
|---|---|---|---|---|---|
| 50CrV4 / EN 47 | 0.47 – 0.55 % | 0.15 – 0.40 % | 0.70 – 1.10 % | 0.90 – 1.20 % | 0.10 – 0.25 % |
| 55Si7 / EN 45 | 0.52 – 0.60 % | 1.50 – 2.00 % | 0.70 – 1.00 % | - | - |
| SAE 5160 / SUP 9 | 0.56 – 0.64 % | 0.15 – 0.35 % | 0.75 – 1.00 % | 0.70 – 0.90 % | - |
| C 75 / EN 42J | 0.70 – 0.80 % | 0.15 – 0.35 % | 0.60 – 0.90 % | - | - |
| AISI 304 | 0.08 % Max | 1.00 % Max | 2.00 % Max | 18.0 – 20.0 % | 8.0 – 10.5 % Ni |
| Grade & Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC / HB) |
|---|---|---|---|---|
| 50CrV4 (Quenched & Tempered) | 1350 – 1650 | 1200 Min | 6 Min | 44 – 50 HRC |
| 55Si7 (Quenched & Tempered) | 1300 – 1600 | 1150 Min | 6 Min | 42 – 48 HRC |
| SAE 5160 (Q&T) | 1400 – 1700 | 1250 Min | 7 Min | 45 – 52 HRC |
| C 75 (Cold Rolled & Hardened) | 1200 – 1550 | 1050 Min | 5 Min | 40 – 47 HRC |
Round Bars: 6 mm to 200 mm diameter in ready stock.
Hexagonal Bars: 6 mm to 85 mm A/F.
Plates & Sheets: Thickness 0.5 mm to 50 mm in custom cut lengths.
We supply Spring Steel products in multiple finish conditions depending on application demands:
- Bright Annealed: Soft annealed condition suitable for stamping, bending, and forming before heat treatment.
- Hardened & Tempered (Blue/Polished): High strength hardened condition with polished blue/yellow surface for immediate spring use.
- Cold Drawn Bright: Smooth drawn surface finish (+/- 0.02mm) for high fatigue coil springs.
Recommended heat treatment procedures for optimum spring elasticity and fatigue resistance:
- Hardening: Heat to 830°C – 860°C, oil quench immediately to retain martensitic structure.
- Tempering: Temper at 400°C – 520°C based on desired hardness (42 to 50 HRC) and elastic recovery.
- Stress Relieving: Heat to 250°C – 350°C after coiling or forming to remove residual bending stresses.
Key industrial applications for spring steel grades:
- Automotive & Transport: Heavy vehicle leaf springs, suspension coil springs, clutch diaphragms, stabilizer bars.
- Engineering & Tools: Pliers, wrenches, surgical instruments, saw blades, tape measures, industrial clips and fasteners.
| British Standard (BS/EN) | American (AISI / SAE) | German (DIN / W-Nr) | Japanese (JIS) |
|---|---|---|---|
| EN 47 / 735A50 | SAE 6150 / 50CrV4 | 50CrV4 / 1.8159 | SUP 10 |
| EN 45 / 250A53 | SAE 9255 | 55Si7 / 1.5026 | SUP 6 / SUP 7 |
| EN 42J / 080A72 | SAE 1074 / C75 | C75S / 1.1248 | SK 5 |
| - | SAE 5160 | 60Cr4 / 1.7177 | SUP 9 |
STEEL MART ADVANTAGE
WHY CHOOSE STEEL MART
Over 40 years of engineering supply chain leadership in industrial steel and spring material stockholding.
40+ YEARS EXPERIENCE
Decades of metallurgical expertise providing premium metals and forgings since 1986.
READY STOCK
Huge warehouse inventory of standard configurations and diameters for immediate loading.
WORLDWIDE EXPORT
Trusted supplier shipping material batches across European, Middle Eastern, and Asian markets.
FAST DELIVERY
Optimized logistics networks ensuring secure and rapid material transit across India and globally.
NEED HELP SELECTING THE RIGHT SPRING STEEL GRADE?
Our metallurgical team is here to assist you in selecting the ideal spring steel grade for your specific bending, fatigue, load capacity, and corrosion resistance requirements.