Hot Rolled Special Alloy Steel Flat Bar 1.7035 / SCr440 / SAE5140
• Similar grades: GB 40Cr / DIN 1.7035 / AISI SAE5140 / JIS SCr440
• Chemical Composition(%):
| C | Si | Mn | Cr | P | S |
| 0.37-0.45 | 0.17-0.37 | 0.5-0.8 | 0.8-1.10 | ≤0.035 | ≤0.035 |
• Introduction:
Hot rolled special alloy steel is one of the most widely used steel in the machinery industry.It has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity
The steel price is moderate and easy to process, and it can obtain certain toughness, plasticity and wear resistance after proper heat treatment.The positive fire can promote the spheroidization and improve the cutting performance of the hardness less than 160HBS.In the tempering temperature 550 ~ 570 ℃, the steel has the best comprehensive mechanical properties.
• Available Shape:
Steel Plate;
Flat Bar;
Round Bar;
Steel Blcok.
• Recommend heat treatment:
| Quenching | Tempering |
| Heating temperature/℃ | Cooling way | Hardness (HRC) | Tempering temperature
/ºC | Cooling way | Hardness
(HRC) |
| 830-860 | Oil Cooling | ≥50 | 150-200 | Air Cooling | ≥48 |
• Feature:
40Cr (SAE5140) steel is belong to Medium carbon steel with hardening and tempering, cold heading steel. Easy processing, after proper heat treament can obtain a certain toughness, plasticity and abrasion resistance.
The positive fire can promote the spheroidization and improve the cutting performance of the hardness less than 160HBS.In the tempering temperature 550 ~ 570 ℃, the steel has the best comprehensive mechanical properties.The hardness of steel is higher than 45 steel, suitable for high frequency quenching, flame quenching and other surface hardening treatment.
• Applications:
After quenched and tempered steel used in the manufacture of work under medium load and medium speed of mechanical parts, such as car steering knuckle, after half shaft and machine tools gear, shaft, worm, spline shaft, top cover, etc.;
After quenching and tempering heat, it is used to manufacture parts that are working in high load, impact and medium speed, such as gear, main shaft, oil pump rotor, sliding block, ring, etc.
Delivery condition:
Hot rolled or forged, black surface
Hardenss: annealed <207HB
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Special Alloy Steel Flat Bar , Alloy Tool Steel SCr440 Overall Mechanical Properties Images
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