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:
1) Sizes, materials and others are all at your requirements and can
be changed;
2) Price varies on materials, dimensions, finish craft and
different payments;
3) We are direct manufacture in machinery manufacturing work with
experience of several decades;
4) Detail production design will be made according to information
you offered;
5) We have adequate inventory, so that we can quick delivery;
6) The most important is that we have advanced equipment.
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