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Aobo Steel | Proveedor global de acero para herramientas en China
Proveedor de acero para herramientas AISI S7 | DIN 1.2355 | Acero para herramientas resistente a los golpes a granel
Reliable Bulk Supply of Annealed S7 for Impact-Resistant Tooling Applications
✓100% UT Tested (SEP 1921-82 Class D/d)
✓Delivered in Fully Annealed Condition
✓MOQ 5 Tons | FCL Recommended (~26 Tons)
✓Round Bar / Flat Bar / Forged Block
S7 tool steel is a shock-resisting tool steel classified in the “S” series under the AISI system. It is designed for applications exposed to high impact and repeated shock loading. International equivalents include UNS T41907, DIN 1.2355 (50CrMoV13-15), JIS SKS93, and the Chinese grade 5Cr3Mn1SiMo1V.
Descripción general del suministro
| Artículo | Detalles |
|---|---|
| Calificación | AISI S7 / DIN 1.2355 |
| Condiciones de entrega | Totalmente recocido (condición de mecanizado suave) |
| Formularios disponibles | Round Bar / Flat Bar / Forged Block |
| Monthly Output | Stable rolling production for distributor replenishment |
| Recommended Export Model | Contenedor completo de 20GP (~26 toneladas) |
| Cantidad mínima de pedido | 5 toneladas |
| Plazo de entrega (stock de lingotes) | Aproximadamente 20 días |
| Plazo de entrega (fundición reciente) | 30–45 días |
| Plazo de entrega (Grado ESR) | Aproximadamente 60 días |
| Inspección | Equipo interno de pruebas ultrasónicas + Inspección por terceros disponible |
| Documentación | EN 10204 3.1 MTC + UT report |
Supply Stability for Distributor Inventory
- Continuous production cycle to support repeat container shipments
- Stable alloy sourcing to reduce raw material price fluctuation risk
- ESR grade available upon request for premium market positioning
- Trazabilidad completa del lote vinculada al número de colada original.
- Dedicated inspection before shipment
Embalaje y envío
- Seaworthy wooden packing with anti-rust protection
- Carga de 20GP optimizada hasta ~26 toneladas
- Mixed sizes and mixed items allowed within one container
- Container loading photos available before shipment
For international distributors, full-container shipments ensure better freight control and smoother customs clearance.
S7 Tool Steel Applications
- Puñetazos
- Troqueles de troquelado
- Cold Forming Dies
- Coining Dies
- Mandriles
- Structural Component Parts
- Trimming Dies
S7 Steel Composition
| Carbón | Manganeso | Silicio | Cromo | Molibdeno | Vanadio |
| 0.45 – 0.55% | 0.20 – 0.90% | 0.20 – 1.00% | 3.00 – 3.50% | 1.30 – 1.80% | 0.20 – 0.35% |
Propiedades
Propiedades físicas
| Densidad | 7.80−7.83 g/cm3 |
| Specific Gravity | 7.83 |
| Módulo de elasticidad | 205−207 GPa |
| Conductividad térmica | 28.5 W/(m⋅K) (at 95∘C) |
| Thermal Expansion (Linear) | |
| 20−100∘C | 12.5 μm/(m⋅K) |
| 20−250∘C | 13.3 μm/(m⋅K) |
| 20−500∘C | 14.27 μm/(m⋅K) |
| Capacidad calorífica específica | ∼0.46 J/(g⋅K) |
| Resistividad eléctrica | ∼0.75 μΩ⋅m |
| Critical Temperature (Ac1) | 793∘C |
| Critical Temperature (Ac3) | 838∘C |
| Temperatura de transformación | 785−800∘C |
Propiedades mecánicas
| Resistencia a la tracción | ∼1517−2151 MPa |
| Límite elástico | ∼1310−1999 MPa |
| Hardness (Annealed) | Max 223−250 HBW |
| Hardness (Heat Treated) | Up to 60−61 HRC |
| Hardness (Tempering Range) | 45−57 HRC (depending on temp) |
| Alargamiento en el punto de ruptura | ∼7−15% |
| Coeficiente de Poisson | 0.27−0.30 |
| Módulo de elasticidad | 207 GPa |
Other Properties
- Shock Resistance: Very high, a primary and defining characteristic of S7.
- Wear Resistance: Good, though generally lower than high-carbon, high-chromium cold-worked steels like O6 or D2 tool steel.
- Dimensional Stability: Good stability throughout the correct heat-treating process. Dimensional growth of +0.001 inches per inch (0.001 mm per mm) when S7 is air quenched from the correct hardening temperature.
- Air Hardening Benefit: S7’s air-hardening capability provides a significant margin of safety during hardening, reducing the risk of distortion and cracking compared to liquid-quenching steels.
- Elevated Temperature Performance: S7 exhibits good resistance to softening at moderately elevated temperatures, making it suitable for medium-temperature hot work applications.
- Surface Hardening: Through processes such as carbonitriding or nitriding, the surface hardness of S7 tool steel can be further improved to approximately 64 HRC. However, such surface treatments can affect S7 steel’s inherent shock resistance and should be carefully considered based on application requirements.
Heat Treatment of S7 Tool Steel
S7 is an air-hardening shock-resisting tool steel designed to maintain high toughness under impact loading. What repeated impact does to that surface over time, and where the safe hardness band for striking tools sits, is covered in the impact wear and spalling page. Typical heat treatment parameters are:
- Preheating: 650–700 °C
- Austenitizing: 925–955 °C
- Quenching: Air cooling
- Tempering: 200–540 °C (double tempering recommended)
After proper heat treatment, S7 typically achieves a hardness range of 54–58 HRC, depending on section size and tempering temperature.