1. Chemical composition
| C | 0.38-0.43% | Cr | 0.80-1.10% |
| Si | 0.10-0.35% | Mo | 0.15-0.25% |
| Mn | 0.75-1.00% | V | - |
| P | ≤0.035% | S | ≤0.040% |
2. Equivalent Steel Grade
| DIN | 1.7225 |
| ASTM A29 | 4140 |
| JIS G4105 | SCM440 |
| BS | 708M40/708A42/709M40 |
| GB | 42CrMo |
| EN ISO 10250 | 42CrMo4 |
3. Q+T Properties
| Tensile Strength | σb (MPa):≥1080(110) |
| Yield Strength | σs (MPa):≥930(95) |
| Elongation | δ5 (%):≥12 |
| Reduction | ψ (%):≥45 |
| Impact Energy | Akv (J):≥63 |
| Impact Toughness | αkv (J/cm2):≥78(8) |
| Annealed Hardness | ≤217HB |
4. Surface Treatment
Plate: Origin Black, Orign cold rolled bright, Machined, Grinded
Bar: Origin Black, Orign cold rolled(drawn) bright, Turned, Peeled, Grinded
5. Size
Round bar: Diameter(mm) Max 800mm; Length(mm) Max 12000mm.
Plate: Thickness(mm) Max 800mm; Width(mm) Max 2300mm; Length(mm) Max 12000mm.
Condition: Cold rolled(drawn)≤50mm, Hot rolled≤12-250mm, Hot forged≥50mm.(Thickness/Diameter)
6. Heat Treatment
1) Forging
Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.
2)Annealing
Heat the AISI 4140 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling.
3)Stress Relieving
When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.
4)Hardening
AISI 4140 steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed AISI 4140 should be heated slowly to 840-875°C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature.
5)Tempering
Heat the AISI 4140 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 550-700°C, soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.
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7. FAQ
1.Q: Are your a factory or a trading company?
A: We are a factory.
2.Q: What is your delivery date?
A:The delivery date is about 10-30 days after receipt of payment.
3.Q: How can I get some sample?
A: We are honored to offer you samples
4.Q: OEM is acceptable?
A: Yes. We are good at steel making since 2002 with complete production equipments. Share your new project with us, we will help you to solve it.
5.Q: What are the difference between you and other steel company?
A: Quality first! The price will be changed according to your order. The rechargeable sample's will return to you after you offer the deposit!Our company are full of chinese culture,Won't you want to come here^.^
The sales are beautiful and handsome0.0!
Contact Person: Ms. Jane ke
Email: sales7 @ss-steel.com.cn
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