1. Product Overview
Spring & Wear Steel Strip is manufactured from high-carbon and alloy spring steels through controlled rolling and heat treatment. In the quenched and tempered condition, it provides high elastic limit, high yield strength, excellent fatigue resistance and good resistance to abrasive wear.
The strip is suitable for applications where repeated bending, tension, clamping or impact occurs. It can be supplied in annealed condition for further forming and heat treatment, or in QT condition for direct use. The material selection can be optimized for strength, toughness, wear resistance, fatigue life and cost.
Core grades:
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51CrV4 — Cr-V alloy spring steel for high-load, large-section springs
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65Mn — Mn alloy spring steel for cost-effective springs and wear parts
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C75 — high-carbon spring steel for tension, clamping and flat springs
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C75Cr1 — Cr-alloyed high-carbon steel for wear resistance and cutting applications
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75Ni8 — Ni-alloyed spring steel for high toughness and impact resistance
Material system synergy:
C75, C75Cr1, 51CrV4 and 75Ni8 are already used in our woodworking saw blade material system. This provides proven processing experience, stable material sourcing and consistent quality control across related product lines.
2. Grade Selection Comparison
| Grade | Material No. | Type | C (%) | Key Alloying Elements | Typical Tensile Strength (MPa) | Typical Hardness | Key Advantages | Typical Applications |
|---|---|---|---|---|---|---|---|---|
| 51CrV4 | 1.8159 | Cr-V alloy spring steel | 0.47–0.55 | Cr 0.90–1.20, V 0.10–0.25 | ≥1350 (QT) | 38.5–52.5 HRC | High fatigue strength, high hardenability, good performance up to 300°C | Mining springs, large-section springs, valve springs, heavy tension parts |
| 65Mn | — | Mn alloy spring steel | 0.62–0.70 | Mn 0.90–1.20 | ≥980 (QT) | HRC60–65 after quenching | High hardness, good wear resistance, economical | Wear parts, retaining rings, washers, general springs |
| C75 | 1.0773 | High-carbon spring steel | 0.70–0.80 | Mn 0.60–0.90 | 1200–1900 (QT) | 38.5–54 HRC | High elasticity, good fatigue life | Tension components, clamping parts, flat springs |
| C75Cr1 | — | Cr-alloyed high-carbon steel | 0.70–0.80 | Cr 0.40–0.60, Mn 0.60–0.90 | ≥1300 (quenched) | HRC58–64 after quenching | High hardness, mukammal aşınma qarshilik, good toughness | Wear-resistant parts, saw blade bodies, cutting components |
| 75Ni8 | 1.5634 | Ni-alloyed spring steel | ~0.75 | Ni ~2% | 1200–1800 (QT) | HRC55+ | High toughness, impact resistance, excellent fatigue resistance | Impact-loaded springs, heavy equipment elastic parts, safety-critical components |
Equivalent grade references:
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51CrV4 ≈ AISI 6150 / SUP10 / 50CrVA
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C75 ≈ AISI 1074 / CK75 / 1.1248
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65Mn ≈ AISI 1566
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75Ni8 ≈ 1.5634
3. Applications
3.1 Mining Equipment Springs
Mining screens, crushers and feeders require springs that withstand continuous dynamic loads and abrasive wear. 51CrV4 is suitable for high-load, large-section springs due to its high hardenability and fatigue resistance. 75Ni8 can be used where higher impact toughness is required.
Recommended grades: 51CrV4, 75Ni8, 65Mn
3.2 Heavy Equipment Components
Excavators, bulldozers and cranes use elastic supports and buffer elements that require high load capacity and fatigue resistance. 51CrV4 in QT condition can provide high yield strength and tensile strength for heavy-duty components.
Recommended grades: 51CrV4, 75Ni8
3.3 Retaining Components
Retaining rings and circlips require stable elastic recovery and resistance to relaxation. C75 va 65Mn can provide reliable elastic performance after quenching and tempering. Cold-rolled strip with tight thickness tolerance supports precision stamping.
Recommended grades: C75, 65Mn, C75Cr1
3.4 Clamping Components
Clamping rings and clamping bands require high elastic limit and low stress relaxation. C75 series strip in QT condition provides high tensile strength and stable clamping force over long service life.
Recommended grades: C75, 51CrV4
3.5 Wear Components
For parts subjected to both wear and impact, such as bucket liners and conveyor scraper blades, C75Cr1 offers high hardness and good toughness. 65Mn is a cost-effective option for high-volume wear parts.
Recommended grades: C75Cr1, 65Mn
3.6 Tension Components
Tension springs and tension bands require low relaxation and high elastic modulus under continuous tensile stress. 51CrV4 va C75 are suitable for high-precision tension control applications.
Recommended grades: 51CrV4, C75, 75Ni8
4. Technical Specifications
4.1 Chemical Composition (Heat Analysis, wt%)
| Grade | C | Si | Mn | P max | S max | Cr | V | Ni |
|---|---|---|---|---|---|---|---|---|
| 51CrV4 | 0.47–0.55 | ≤0.40 | 0.70–1.10 | 0.025 | 0.025 | 0.90–1.20 | 0.10–0.25 | ≤0.40 |
| 65Mn | 0.62–0.70 | 0.17–0.37 | 0.90–1.20 | 0.035 | 0.035 | ≤0.25 | — | ≤0.25 |
| C75 | 0.72–0.80 | 0.15–0.35 | 0.60–0.90 | 0.025 | 0.025 | ≤0.40 | — | ≤0.40 |
| C75Cr1 | 0.70–0.80 | 0.15–0.35 | 0.60–0.90 | 0.025 | 0.025 | 0.40–0.60 | — | ≤0.40 |
| 75Ni8 | 0.72–0.80 | 0.15–0.35 | 0.50–0.80 | 0.025 | 0.025 | ≤0.40 | — | 1.80–2.20 |
51CrV4 composition is based on EN 10132-4. C75 series is based on DIN 17222 / EN 10132-4. 65Mn is based on GB/T 1222.
4.2 Mechanical Properties (Typical, QT Condition)
| Grade | Yield Strength Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Elongation A (%) | Hardness Range |
|---|---|---|---|---|
| 51CrV4 | ≥1175 | 1350–1650 | ≥6 | 38.5–52.5 HRC |
| 65Mn | ≥785 | ≥980 | ≥8 | HRC60–65 after quenching |
| C75 | ≥1100 | 1200–1900 | ≥5 | 38.5–54 HRC |
| C75Cr1 | ≥1100 | ≥1300 | ≥10 | HRC58–64 after quenching |
| 75Ni8 | — | 1200–1800 | — | HRC55+ |
Actual mechanical properties depend on heat treatment, section size and testing direction. Please confirm final properties with our technical team.
4.3 Recommended Heat Treatment
| Grade | Quenching Temperature | Cooling Medium | Tempering Temperature | Reference Standard |
|---|---|---|---|---|
| 51CrV4 | 850 ± 10°C | Oil | 450 ± 10°C | EN 10132-4 |
| 65Mn | 830–850°C | Oil | 400–500°C | GB/T 1222 |
| C75 | 810–840°C | Oil / Water | 350–450°C | EN 10132-4 |
| C75Cr1 | 820–850°C | Oil | 350–450°C | EN 10132-4 |
| 75Ni8 | 830–860°C | Oil | 400–500°C | EN 10132-4 |
4.4 Available Specifications
| Item | Range |
|---|---|
| Thickness | 0.10–6.0 mm (cold-rolled narrow strip); 2.0–25.4 mm (hot-rolled wide strip) |
| Width | 6–600 mm (custom slitting available) |
| Delivery Condition | Annealed (soft), Quenched + Tempered (QT), Cold-rolled hard |
| Surface | Bright, blued, oiled, galvanized (on request) |
| Edge | Round edge, slit edge, mill edge |
5. Why Choose Our Spring & Wear Steel Strip
✅ Wide Grade Coverage
From economical 65Mn to high-performance 51CrV4 and 75Ni8, we support different performance levels and cost targets.
✅ Proven Material System
C75, C75Cr1, 51CrV4 and 75Ni8 are already used in our woodworking saw blade material system, demonstrating stable processing and quality control.
✅ Precision Dimensions
Cold-rolled strip can be produced with thickness tolerance down to ±0.01 mm and width tolerance of ±0.05 mm for precision stamping and forming.
✅ Custom Heat Treatment
We can supply different hardness levels and mechanical property combinations according to customer requirements.
✅ Quality Assurance
Material Test Certificates (MTC) and third-party inspection reports (SGS/BV) are available. Production follows ISO 9001 quality management.
6. FAQ
Q1: What is Spring & Wear Steel Strip used for?
It is used for mining equipment springs, heavy equipment components, retaining rings, clamping parts, wear parts and tension components. It is suitable for applications requiring elasticity, fatigue resistance and wear resistance.
Q2: What is the difference between 51CrV4 and 65Mn?
51CrV4 is a Cr-V alloy spring steel with higher hardenability and fatigue strength. It is suitable for large-section, high-load springs and can perform at temperatures up to 300°C. 65Mn is a Mn alloy spring steel with lower cost and good hardness after quenching, suitable for smaller springs and wear parts.
Q3: What delivery conditions are available?
Annealed (soft), quenched + tempered (QT), and cold-rolled hard. The choice depends on your forming and heat treatment process.
Q4: Can thickness and width be customized?
Yes. Cold-rolled strip: thickness 0.10–6.0 mm, width 6–600 mm. Hot-rolled strip: thickness 2.0–25.4 mm. Custom slitting, shearing and cut-to-length are available.
Q5: What is the MOQ and lead time?
Standard grades: MOQ 1–3 tons. Lead time is about 15 days for stock items and 20–35 days for custom specifications. Please confirm with our sales team.
Q6: Do you provide samples and MTC?
Yes. Small samples for trial and validation can be provided. Material Test Certificates and third-party inspection reports are available.
