Guangzhou Changfeng Steel Co., LTD
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Hot Rolled Steel Flat Bar SCM440 4140 1.7225 42CrMo For Mechanical Gear Bolt Use
1. Chemical Composition (%)
| C | Si | Mn | Cr | Mo | P | S | Ni |
| 0.38~0.45 | 0.17~0.37 | 0.50-0.80 | 0.90~1.20 | 0.15-0.25 | ≤0.03 | ≤0.03 | ≤0.25 |
2. Application
It's application is as below:
A. The section of large forgings
B. Locomotive traction gears
C. The rear axle
D. The connecting rod
E. The spring load clip
F. Oil drill pipe joints
G. Fishing tools.
2. Features
1) Weldability suffers with increasing chromium content;
2) High temperature strength and high pressure hydrogenation properties are promoted by chromium and molybdenum;
3) Molybdenum significantly reduces temper brittleness;
4) Chromium renders steel oil hardenable and increase hardenability;
5) Chromium molybdenum high tensile steel with yield strength of 550N/mm2;
3. 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)
4. Available Size
| Flat Bar (mm) | Round bar (mm) | |||
| Thickness | Width | Length | Diameter | Length |
| 12-280 | 2200 | 5800 | 16-450 | 3000-6000 |
5. Delivery state
A. Hot rolled or forged
B. Black surface
C. Q+T: hardness 28-34 HRC or Annealing:HBS<=235.
6. Delivery time
For abundant stock, 15-20 days.For customized products, 30-50 days.
We have full set of equipement (sawing machine/grinding/polishing machine) to make customer's specification.
7. Our service
8. Product picture
Warehouse
Processing
Strict Quality Control