High carbon chromium stainless steel is a specialized type of bearing material known for its excellent wear resistance, corrosion resistance, and high hardness. It is commonly used in applications where mechanical strength and durability are essential, especially in harsh environments such as seawater, chemicals, and high-temperature conditions. Below is an overview of the chemical composition, mechanical properties, and key characteristics of two common grades: 9Cr18 and 9Cr18Mo.
**Chemical Composition**
| Brand | C | Si | Mn | P | S | Cr | Mo |
|--------------|---------|--------|--------|--------|--------|--------|--------|
| 9Cr18 | 0.90–1.00 | 0.08 | 0.08 | 0.035 | 0.030 | 17.0–19.0 | — |
| 9Cr18Mo | 0.95–1.10 | 16.0–18.0 | 0.40–0.70 | — | — | 17.0–19.0 | 0.03–0.10 |
*Note:*
1. Residual elements such as nickel (≤0.30%) and copper (≤0.25%) must not exceed specified limits.
2. Tolerances for finished steel: Chromium ±0.15%, Molybdenum ±0.03%.
**Mechanical Properties**
| Brand | Steel Diameter (mm) | Tensile Strength (MPa) | Hardness (HBS) |
|--------------|---------------------|--------------------------|----------------|
| 9Cr18 | >16 | — | 197–241 |
| | ≤16 | 590–785 | — |
| 9Cr18Mo | >16 | — | 197–241 |
| | ≤16 | 590–785 | — |
**Characteristics and Applications**
| Brand | Main Characteristics | Application Examples |
|-----------------|--------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------|
| 9Cr18 / 9Cr18Mo | Offers high hardness, good machinability, and tempering stability. However, it has poor thermal conductivity. It performs well after quenching and low-temperature tempering. | Used in corrosion-resistant bearings for seawater, river water, nitric acid, chemical, and nuclear environments. Suitable for high-temperature bearings up to 250°C. Also used for medical instruments, precision tools, and parts requiring low wear and corrosion resistance. |
This type of steel is ideal for applications where both mechanical performance and environmental resistance are critical. Whether in industrial machinery or specialized equipment, high carbon chromium stainless steel remains a reliable choice for long-lasting and high-performance bearing solutions.
Editor: Hardware Business Network Information Center
Source: http://news.chinawj.com.cn
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