9Cr18Mo Stainless Steel |102Cr17Mo | 440C | SUS440C Supplier In China
For Blades, Bearings & Precision Parts | MOQ 5 Tons | Bulk Supply
9Cr18Mo and 102Cr17Mo are the same type of steel. 9Cr18Mo is the old designation used in the Chinese national standard GB/T 1220-1992. 102Cr17Mo is the new designation adopted in the revised Chinese national standards GB/T 1220-2007 and GB/T 20878-2007.
9Cr18Mo(102Cr17Mo) is a high-carbon, high-chromium martensitic stainless steel, developed from the 95Cr18 (9Cr18) grade through the addition of molybdenum (Mo). Consequently, it exhibits superior hardness, wear resistance, high-temperature strength, tempering resistance, and corrosion resistance compared to 95Cr18 (9Cr18) steel. This steel also possesses good high-temperature dimensional stability, making it suitable for manufacturing plastic molds, bearings, surgical instruments, and measuring tools that operate under high loads, high wear, and corrosive conditions. As a ledeburitic steel, it is prone to non-uniform carbide segregation, which can adversely affect the service life of components. Therefore, it is imperative to control the processing parameters and select an appropriate processing ratio during hot working.
9Cr18Mo Steel Supply Overview
| Calificación | GB 9Cr18Mo / 440C / SUS440C |
| Condiciones de entrega | Totalmente recocido (estado blando para el mecanizado) |
| Formularios disponibles | Barra redonda / Barra plana / Placa / Bloque forjado |
| Capacidad de producción mensual | Aproximadamente 1000 toneladas métricas |
| Cantidad de exportación recomendada | Contenedor completo de 20GP (~26 toneladas) |
| Cantidad mínima de pedido | 5 toneladas |
| Plazo de entrega (con existencias 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 | MTC (EN 10204 3.1) + Informe UT |
Why Global Distributors Source 9Cr18Mo from Aobo Steel
- Suministro mensual continuo de alrededor de 1000 toneladas
- Cantidad mínima de pedido (MOQ) a partir de 5 toneladas para pedidos al por mayor.
- Longitudes de barras y placas optimizadas para contenedores
- Se admiten tamaños mixtos para la carga de exportación.
- Entrega recocida para mecanizado posterior
- Abastecimiento estable a través de socios de cadena de suministro integrados
- Inspección UT disponible para SEP 1921-82 D/d o E/e
- Trazabilidad del MTC y del lote con cada envío
- Seguimiento del número de lote para el control de pedidos
- Opciones de superficie negra, torneada y pulida
- Embalaje a granel para exportación marítima
- Ruta de conversión clara a la página dedicada al suministro a granel.
Producción estable para un suministro a granel a largo plazo
- Producción mensual continua de alrededor de 1000 toneladas.
- Ciclos de producción continuos para la reposición de inventario.
- El proceso ESR (refundición por electroescoria) está disponible bajo petición.
- Suministro estable de aleaciones para reducir el riesgo de interrupción del suministro.
- Trazabilidad completa del lote vinculada al número de colada original.
Available 9Cr18Mo Steel Forms
Control de calidad para pedidos al por mayor
Cada lote de acero para herramientas suministrado por Aobo Steel se verifica antes del envío para garantizar la precisión del grado, la integridad interna y la trazabilidad de los pedidos a granel.
- Composición química verificada mediante un espectrómetro.
- Pruebas ultrasónicas disponibles (SEP 1921-82)
- Entregado en estado recocido esferoidizado
- Certificado de prueba de fábrica (EN 10204 3.1) con número de colada
- Inspección dimensional y superficial antes del envío.
Embalaje para exportación y carga de contenedores
- Embalaje profesional apto para exportación marítima
- Carga de 20GP optimizada hasta ~26 toneladas
- Se admiten grados y tamaños mixtos.
- Protección anticorrosión para largos tránsitos marítimos
Para envíos internacionales, se recomienda encarecidamente la carga de contenedores completos para garantizar la rentabilidad y una tramitación aduanera más ágil.
Compostion(GB/T 20878-2007)
| C | Cr | Mes | Ni | Si (≤) | Mn (≤) | P (≤) | S (≤) |
| 0.95 – 1.10 | 16.00 – 18.00 | 0.40 – 0.70 | -0.6 | 0.8 | 0.8 | 0.04 | 0.03 |
Equivalent Grades and Compositions
| Standard | Steel Grade | C | Cr | Mes | Ni | Si (≤) | Mn (≤) | P (≤) | S (≤) |
| Japan JIS | SUS440 | 0.95 – 1.20 | 16.00 – 18.00 | ≤(0.75) | -0.6 | 1 | 1 | 0.04 | 0.03 |
| USA ASTM | 440C / S4400C | 0.95 – 1.20 | 16.0 – 18.0 | ≤0.75 | — | 1 | 1 | 0.04 | 0.03 |
| International ISO | X105CrMo17 | 0.95 – 1.20 | 16.0 – 18.0 | 0.40 – 0.80 | — | 1 | 1 | 0.04 | 0.015 |
| Europe EN | X105CrMo17 / 1.4125 | 0.95 – 1.20 | 16.0 – 18.0 | 0.40 – 0.80 | — | 1 | 1 | 0.04 | 0.015 |
Critical Points of 9Cr18Mo(102Cr17Mo)
- C.A1≈815∼865℃: This is the lower critical temperature upon heating. It represents the temperature range at which austenite begins to form from the ferrite-carbide matrix.
- Arkansas1≈665∼765℃: This is the lower critical temperature upon cooling. It represents the temperature range in which the transformation of austenite to ferrite or pearlite is complete.
- Ms≈145℃: This is the Martensite start temperature. It is the temperature at which the transformation of austenite to martensite begins during rapid cooling (quenching).
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Hot Froging Process of 9Cr18Mo(102Cr17Mo)
| Artículo | Heating Temperature/°C | Initial Forging Temp./°C | Final Forging Temp./°C | Método de enfriamiento |
| Lingote de acero | 1130 ~ 1150 | 1080 ~ 1100 | 850 ~ 900 | Sand Cooling |
| Lingote de acero | 1100 ~ 1120 | 1050 ~ 1080 | 850 ~ 900 | Sand Cooling |
Special attention should be paid to the hot-working process of 9Cr18Mo (102Cr17Mo) steel. It is recommended to use a cold-charged furnace for heating, and the heating rate should not be too fast, especially below 700°C. At the same time, the final forging temperature should be controlled at a higher level, and strict attention should be paid to the cooling conditions.
Heat Treatment of 9Cr18Mo(102Cr17Mo)
The processes for preliminary heat treatment are as follows:
- Recrystallization Annealing: Heat to 730∼- 750°C, then air cool.
- Annealing: Heat to 850∼- 870°C and soak for 4-6 hours. Subsequently, the furnace is cooled to below 600°C, then air-cooled. The hardness after annealing should be ≤ 255 HBW.
- Quenching: Heat to 1050∼- 1100∘°C, then oil quench. The as-quenched hardness should be ≥ 58 HRC.
- Tempering: Heat to 160∼- 180∘°C and soak for 3-5 hours. The final hardness after tempering should be ≥ 58 HRC.
The effect of quenching temperature and cold treatment on hardness
| Quenching Temperature (°C) | 1020 | 1040 | 1060 | 1080 | 1100 |
| Hardness after Conventional Quenching (HRC) | 58.5 | 58 | 61.5 | 61 | 61 |
| Hardness after Cold Treatment (HRC) | 60 | 60.5 | 62 | 63 | 64 |
Relationship between hardness and tempering temperature
| Temperatura de templado (°C) | Untempered | 100 | 200 | 300 | 400 | 500 | 600 | 700 | |
| 950°C Air Cooling | Hardness (HRC) / Quenching | 50 | 47 | 48 | 48 | 47 | 47 | 38 | 25 |
| 1000°C Air Cooling | 56 | 51.5 | 52 | 50 | 49 | 49 | 40.5 | 27 | |
| 1050°C Air Cooling | 58 | 56 | 56 | 53 | 52 | 52 | 43 | 29 | |
| 1100°C Air Cooling | 60.5 | 57 | 58 | 56 | 54 | 55 | 47 | 32 |
Propiedades mecánicas
Influence of Quenching Temperature and Cryogenic Treatment on Mechanical Properties
| Quenching Temperature /°C | Not Cryogenically Treated | After -75°C Cryogenic Treatment (held for 1h) | ||
| σbb/MPa | aK / J・cm⁻² | σbb/MPa | aK / J・cm⁻² | |
| 1020 | 3250 | 30 | 30 | 30 |
| 1040 | 3000 | 37 | 37 | 11 |
| 1060 | 3500 | 40 | 40 | 6 |
| 1080 | 2750 | 25 | 25 | 3 |
| 1100 | 2500 | 3 | 3 | 2.5 |
Corrosion Resistance
Corrosion Resistance of 102Cr17Mo (9Cr18Mo) Steel
| Heat Treatment Process | Dureza HRC | Medium Conditions | Corrosion Rate /g·(m²·h)⁻¹ | ||
| Medio | Mass Fraction (%) | Temperature/°C | |||
| 1050°C Oil Quenching | 61 | Sulfuric Acid | 2 | Boiling | 575.6 |
| Sulfuric Acid | 5 | 1003.9 | |||
| Nitric Acid | 40 | 1.15 | |||
| 1050°C Oil Quenching, 150°C Tempering for 1h | 60 | Sulfuric Acid | 2 | 502 | |
| Sulfuric Acid | 5 | 968.3 | |||
| Nitric Acid | 40 | 1.04 | |||