9Cr18Mo UNS S44004 AISI 440C Martensitic Stainless Steel Bars and Plates
9Cr18Mo steel is a high-carbon and high-chromium martensitic stainless steel with properties and applications similar to 95Cr18 (9Cr18) steel. Due to the addition of molybdenum in the steel, its hot strength and temper resistance are both superior to those of 95Cr18 (9Cr18) steel. After appropriate heat treatment, 9Cr18Mo can achieve a high hardness of HRC 58-60 while maintaining good rust resistance. It is suitable for occasions requiring high strength, wear resistance and corrosion resistance, but has poor weldability and is generally not used for welded structural components.
Applications of 9Cr18Mo
9Cr18Mo with molybdenum delivers enhanced corrosion and wear resistance for high-hardness precision components.
- 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 9Cr18Mo
| Steel Grade | Specification | Specification Name |
|
9Cr18Mo / 102Cr17Mo / S45990 |
GB/T 1220 | Stainless steel bars |
|
GB/T 4356 |
Stainless steel wire rods | |
|
UNS S44004 / 440C |
ASTM A276/A276M |
Standard specification for stainless steel bars and shapes |
|
ASTM A493/SA493 |
Standard Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging | |
|
ASTM A314/ SA314 |
Standard Specification for Stainless Steel Billets and Bars for Forging | |
|
ASTM A473/ SA473 |
Standard Specification for Stainless Steel Forgings | |
|
ASTM A484/SA484 |
Standard Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings | |
|
ASTM A756/SA756 |
Standard Specification for Stainless Anti-Friction Bearing Steel | |
|
ASTM A580/SA580 |
Standard Specification for Stainless Steel Wire | |
|
UNS S44004 / 440C |
AMS 5618 | AEROSPACE MATERIAL SPECIFICATION |
|
AMS 5630 |
AEROSPACE MATERIAL SPECIFICATION | |
|
AMS 5880 |
AEROSPACE MATERIAL SPECIFICATION | |
|
1.4125 / X105CrMo17 |
EN 10088-3 |
Stainless Steels Part 3-Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| SUS440C |
JIS G 4303 |
Stainless Steel bars |
|
JIS G 4308 |
Hot rolled stainless steel sheet and strip | |
|
JIS G 4318 |
Cold finished stainless steel bars |
Typical Chemical Composition of 9Cr18Mo
|
Elements |
C | Si | Mn | P | S | Ni | Cr |
Mo |
| Contents% | 0.95~1.10 | ≤0.80 | ≤0.80 | ≤0.040 | ≤0.030 | ≤0.60 | 16.00~18.00 |
0.40~0.70 |
| Produce as per other specifications or technical agreements (if need) are available. | ||||||||
Typical Heat Treatment Condition and Mechanical Properties of 9Cr18Mo
|
Condition |
Mechanical Properties and Hardness | ||||||
| Rp0.2/(N/mm2) | Rm/(N/mm2) | A/% | Z/% | Aku2/J | HBW |
HRC |
|
|
Annealed (800℃-900℃, cool slowly) |
/ | / | / | / | / | ≤269 | / |
| Q+T (1000℃-1050℃, oil; 200℃-300℃, air) | / | / | / | / | / | / |
≥55 |
| Products produced as per other specifications or technical agreements (if need) are available. | |||||||
Effect of Heat Hreatment on Mechanical Properties of 9Cr18Mo at Room Temperature
Hardness of
9Cr18Mo
Yield Strength of
9Cr18Mo
Elongation of
9Cr18Mo
Impact Energy of
9Cr18Mo
Product Forms and Size Range of 9Cr18Mo
| 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. | |
