40Mn Steel Grades
40Mn steel is a popular type of steel that is widely used in various industries such as manufacturing, construction, and transportation. It is a high-quality steel that is known for its strength, durability, and resistance to wear and tear. In this article, we will explore some of the key features and benefits of 40Mn steel and why it is a great choice for many applications.
First and foremost, 40Mn steel is known for its exceptional toughness and hardness. It has a high carbon content, which gives it a strong and robust structure that is able to withstand heavy use and extreme conditions. This makes it a popular choice for manufacturing equipment and machinery such as cranes, bulldozers, and excavators, which need to be able to withstand heavy loads and continuous use.
Moreover, 40Mn steel is highly resistant to wear and abrasion, making it an ideal option for applications where materials are constantly subjected to friction and impact. For example, it is commonly used in the manufacture of gears, shafts, and other mechanical parts that require high wear resistance and durability.
Another great advantage of 40Mn steel is its versatility. It is a very flexible and adaptable material that can be easily shaped and formed, making it ideal for use in a wide variety of applications. It can be easily welded, bent, or cut to the required size and shape, making it a popular choice for construction and fabrication projects.
1. Chemical Composition:
- Carbon: 0.37 to 0.44%
- Silicon: 0.17 to 0.37%
- Manganese: 0.50 to 0.80%
- Phosphorus: ≤0.035%
- Sulfur: ≤0.035%
2. Mechanical Properties:
- Tensile strength: ≥550MPa
- Yield strength: ≥335MPa
- Elongation: ≥16%
- Impact toughness: ≥63J/cm2
3. Heat Treatment:
- Annealing: 800-850°C, slow cooling in the furnace
- Normalizing: 870-920°C, air cooling or oil quenching
- Tempering: 550-600°C, water or oil quenching
4. Applications:
- Manufacturing of gears, shafts, bolts, nuts, and other mechanical parts
- Making various machine tools, agricultural machinery, and automotive components
- Used in the construction industry for the production of flat springs, coil springs, and torsion bars.
|
Chemical composition %: |
||||||||
|
C |
Si |
Mn |
S |
P |
Cr |
Ni |
Cu |
|
|
40Mn |
0.37-0.45 |
0.17-0.37 |
0.70-1.00 |
≤0.035 |
≤0.035 |
≤0.25 |
≤0.30 |
≤0.25 |
40Mn steel product mechanical properties:
Grade |
mechanical properties: |
||||||
|
Tensile strength σb |
Yield strength σb |
Elongation σb |
reduction of area |
Hardness |
Impacting Energy Akv (J) |
Notched bar impact strength |
|
|
min |
min |
min |
min |
max |
min |
min |
|
|
40Mn |
590(60) |
355(36) |
17 |
45 |
229HB |
47 |
59(6) |
PHYSICAL PROPERTIES OF GRADE 40MN
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J/kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 238(≥) | 583(≥) | 43 | 33 | 22 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 313 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0)N/mm2 |
Creep rupture strength (10000h) (Rp1,0)N/mm2 |
|||||
| 581 | 658 | 737 |
40MN RANGE OF PRODUCTS
| Product type | Products | Dimension | Processes | Deliver Status |
|---|---|---|---|---|
| Plates/Sheets | Plates/Sheets | 0.08-200mm(T)*W*L | Forging,hot rolling and cold rolling | Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting |
| Steel Bar | Round Bar,Flat Bar,Square Bar | Φ8-1200mm*L | Forging,hot rolling and cold rolling,Cast | Black,Rough Turning,Shot Blasting, |
| Coil/Strip | Steel Coil/Steel Strip | 0.03-16.0x1200mm | Cold-Rolled&Hot-Rolled | Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting |
| Pipes/Tubes | Seamless Pipes/Tubes,Welded Pipes/Tubes | OD:6-219mm x WT:0.5-20.0mm | Hot extrusion,Cold Drawn,Welded | Annealed,Solution and Aging,Q+T,ACID-WASHED |
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