9Cr18 Martensitic Stainless Steel Bars and plates
9Cr18 steel is a high-carbon and high-chromium martensitic stainless steel, with high hardness, high strength, corrosion resistance is improved compared to Cr17-type martensitic stainless steels, while other properties are similar. Machinability is moderate due to the high viscosity and rapid temperature rise during processing. Uneven carbides can easily form in steel, affecting its quality and properties. Therefore, high requirements are placed on production processes, experience, and quality control.
Applications of 9Cr18
Widely used in fields demanding high hardness and wear resistance.
- Tool manufacturing: It is commonly used to manufacture all kinds of tools, such as mechanical cutting tools, shearing tools and surgical blades, etc.
- Bearing manufacturing: It can be used to manufacture products under high-speed rotation and high load conditions, such as bearing rings and rolling elements.
- Mechanical components: It is suitable for manufacturing mechanical components that require corrosion resistance, high strength and wear resistance, such as shafts, rods, springs and fasteners, etc.
- Medical device: Because of its outstanding corrosion resistance and biocompatibility, it can be used to manufacture medical devices such as surgical instruments and dental instruments, etc.
- Chemical equipment: In chemical equipment, it is used to manufacture components that can withstand corrosive media, such as pumps and valves, etc.
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High-end kitchenware: Because of high hardness and corrosion resistance, it is also used to manufacture high-end kitchenware, such as knives and pots, etc.
Equivalent Grades and Commonly Used Specifications of 9Cr18
| Steel Grade | Specification | Specification Name |
| 9Cr18 /
95Cr18 / S44090 |
GB/T 1220 | Stainless steel bars |
| GB/T 4356 | Stainless steel wire rods | |
| GJB 2294A | Specification for stainless and heat-resisting steel bars for aviation | |
| GB/T 20878 | Stainless and heat-resisting steels – Designation and chemical composition | |
| GB/T 3086 | High carbon chromium stainless bearing steels | |
| 95X18 | GOST 5632 | High-alloy steels and corrosion-proof, heat-resisting and high-temperature alloys grades |
| Produce as per other specifications or technical agreements (if need) are available. | ||
Typical Chemical Composition of 9Cr18
| Elements | C | Si | Mn | P | S | Ni | Cr |
| Contents% | 0.90~1.00 | ≤0.80 | ≤0.80 | ≤0.040 | ≤0.030 | ≤0.60 | 17.00~19.00 |
| Produce as per other specifications or technical agreements (if need) are available. | |||||||
Typical Heat Treatment Condition and Mechanical Properties of 9Cr18
|
Condition |
Mechanical Properties and Hardness | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Z /% | Aku2/J | HBW |
HRC |
|
|
Annealed (800℃-920℃, cool slowly) |
/ | / | / | / | / | ≤255 | / |
| Q+T (1000℃-1050℃, oil, 200℃-300℃, oil, air) | / | / | / | / | / | / |
≥55 |
| Products produced as per other specifications or technical agreements (if need). | |||||||
Effect of Cold Treatment on 9Cr18 Quenching Hardness
|
Quenching temperature ℃ |
Hardness, HRC | ||||
|
After quenching |
-75℃×1h | 100℃ Tempering | 160℃ Tempering |
200℃ Tempering |
|
|
1000 |
59 / 59 | 59.5 | 58 / 59.5 | 57 / 59 |
55 / 57 |
|
1050 |
60 / 60 | 61.5 | 60 / 61 | 59 / 61 | 57 / 59 |
| 1100 | 60.5/ 60.5 | 62 | 60 / 62 | 59.5 / 62 |
57 / 60.5 |
Product Forms and Size Range of 9Cr18
| Product forms | Size range |
| Bars | Diameter or side length: 5.0mm~1000mm |
| Flats |
thickness: 4.0mm~1000mm width: 300mm~2200mm |
| Produce as other form and size according to technical requirements are available. | |
