Guangzhou Changfeng Steel Co., LTD
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Alloy Structure Steel Round Bar SAE4140/SCM440 For Auto Parts
It is an alloy structural steel, below is the specification of Engineering Steel Bar SAE4140:
High strength, high hardenability, good toughness, small deformation during quenching, high creep strength and long-lasting strength at high temperatures.
For the manufacture of steel with higher strength and quarry section than 35CrMo, such as locomotive traction gear, supercharger transmission gear, rear axle, heavy load connecting rod and spring clamp, can also be used 2000m below the deep oil drill pipe joints and salvage tools.
Equivalent grades
| GB(China) | DIN(German) | AISI(USA) | JIS(Japan) |
| 42CrMo | 1.7225 | SAE4140 | SCM440 |
Applications
Used in the manufacture of high strength, large cross-section forgings such as supercharger transmission gear,rear axle, hummar shank etc.
Chemical Composition(%)
| C | Si | Mn | Cr | P | S | Mo |
| 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.20 | ≤0.035 | ≤0.035 | 0.15-0.25 |
Recommend heat treatment
| Quenching | Tempering | ||||
| Heating temperature/℃ | Cooling way | Hardness (HRC) | Tempering temperature /ºC | Cooling way | Hardness (HRC) |
| 850-880 | Oil Cooling | 50-52 | 450-650 | Air cooling | 36-42 |
Available size(mm)
| Plate/Flat Bar Size(mm) | Round bar Size(mm) | |||
| Thickness | Width | Length | Diameter | Length |
| 10-200 | 155-2200 | 2200-6000 | 16-450 | 3000-6000 |
Feature
1. Good strength, hardenability and toughness.
2. High creep strength and long lasting strength under the high temperature.
Mechanical Properties:
Tensile strength:σb (MPa): ≥1080(110)
Yield strength:σs (MPa): ≥930(95)
Elongation:δ5 (%): ≥12
Section shrinkage:ψ (%): ≥45
Impact work:Akv (J): ≥63
Impact toughness value:αkv (J/cm²): ≥78(8)
Standards and Practices:
Bars & Forgings – To comply with all requirements of the latest edition of the Standards of the Society of Automotive Engineers for SAE 4140 steel.
Plates – To comply with all requirements of the latest edition of the Steel Products Manual of the Iron and Steel Society of AIME, for 4140 alloy steel plate.
Why Choose Us?
1. Competitive price and high quality
2. Quick delivery and standard exporting package
3. OEM/ODM order accept
4. Flexible payment with T/T, L/C
5. Smooth production ability(1000tons/month)
6. Approved by ISO9001, CE, SGS every year
7. Best service with 24 hours reply
More about Changfeng Steel
Guangzhou Changfeng Steel Co., Ltd is a mould steel stockist, we have our own factory and trading company. Our main steels are carbon tool steel, plastic mold steel, hot work tool steel, cold work tool steel, alloy steel for mechanical, etc.
All material are with high quality and competitive price.
We are here waiting for a cooperation chance between us, contact us and you will have one more loyal mold steel supplier!