Guangzhou Changfeng Steel Co., LTD
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Special Hot Rolled SAE4140 / 1.7225 Alloy Tool Steel Round Bar
SAE4140 steel belongs to ultra-high strength steel, with high strength and toughness, hardenability is also good, no significant temper brittleness, after quenching and tempering have higher fatigue limit and resistance to multiple impact ability, low temperature impact toughness good.
Similar grades
AISI(USA): SAE4140
DIN(German): 1.7225
JIS(Japan): SCM440
GB(China): 42CrMo
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 |
Heat treatment
| Quenching | Tempering | ||||
| Heating temperature/℃ | Cooling way | Hardness (HRC) | Tempering temperature /ºC | Cooling way | Hardness (HRC) |
| 850-880 | Oil Cooling | ≥53 | 450-650 | Air cooling | 25-40 |
Available size(mm)
| Plate / Flat Bar Size(mm) | Round bar Size(mm) | |||
| Thickness | Width | Length | Diameter | Length |
| 10-200 | 155-2200 | 2000-6000 | 16-450 | 3000-6000 |
Supply status: Hot rolled & Forged
Heat treatment: Annealed & Quenched + Tempered
Sueface: Normally black surface, also can be provided according to customers' request
Feafure and application
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, pressure vessel gear, rear axle, heavy load connecting rod and spring clamp , Can also be used for deep well drilling pipe joints and fishing tools below 2000m, and can be used for bending machine molds.
It is mainly used to manufacture measuring tools, cutting tools, impact tools and cold and hot molds and some special-purpose tools.
About Alloy steel
Alloy tool steel, is based on carbon steel but add of chromium, molybdenum, tungsten, vanadium and other alloying elements to improve hardenability, toughness, wear resistance and heat resistance of a class of steel.
The addition of Cr and Mn improves the hardenability of the tool steels, with the addition of other elements optionally added at the same time (up to 5% in total) to form a series of alloy tool steels.
What we supply
1. Carbon steel: S50C plate & flat bar, S45C round bar
2. Plastic mould steel: 1.2311, 1.2312, 1.2083, 1.2738
3. Hot work mould steel: H13/1.2344/SKD61
4. Cold work mould steel: D2/1.2379/SKD11; D3/1.2080/SKD1
5. Ally steel: SAE4140/1.7225/SCM440; SAE5140/1.7035/SCr440
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