Guangzhou Changfeng Steel Co., LTD
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1.7225 / SCM440 / SAE4140 Hot Rolled Alloy Steel Round Bar for Mechanical
1, Equivalent grades:
| GB(China) | DIN(German) | AISI(USA) | JIS(Japan) |
| 42CrMo | 1.7225 | SAE4140 | SCM440 |
2, Perform Standard: GB/T 3077-1999
| C | Si | Mn | Cr | Mo | P | S | Ni |
| 0.38~0.45 | 0.17~0.37 | 0.60~0.90 | 0.90~1.20 | 0.15-0.25 | ≤0.018 | ≤0.030 | ≤0.012 |
3, Available size(mm)
| Flat Bar Size(mm) | Round bar Size(mm) | |||
| Thickness | Width | Length | Diameter | Length |
| 10-200 | 155-2200 | 2000-6000 | 35-260 | 3000-6000 |
Listed specifications are only typical grades; products of required specifications can be developed/produced per international, Chinese or industry standards, or based on agreements with customers.
4, Application:
It used for section large forgings, such as locomotive traction gears, with supercharger drive gear,
the rear axle, the connecting rod and the spring load greatly clip,oil drill pipe joints and fishing tools,etc.
5, 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)
6, Heat treatment:
| Quenching | Tempering | |||||
| Heating temperature/℃ | Cooling way | Hardness (HRC) | Tempering temperature/ºC | Cooling way | Hardness (HRC) | |
| 840-880 | Oil Cooling | ≥53 | 450-650 | Air cooling | 25-40 | |
7, Feature:
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;
8, Ready Stock:
Round Bar diameter 35-260mm.All the sizes as require can be customerized as fresh production with MOQ.
9, Delivery state:
Hot rolled, black, hardness or tempered hardness:28-34 HRC.
Annealing:HBS<=235.
10, 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.
11, Our service:
