Guangzhou Changfeng Steel Co., LTD
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Hot Forged Q+T Black Surface Alloy Steel Round Bar SAE4140 SCM440 42CrMo 1.7225 EN19
Equivalent grades:
| GB(China) | DIN(German) | AISI(USA) | JIS(Japan) |
| 42CrMo | 1.7225 | SAE4140 | SCM440 |
SAE 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.
Chemical Composition(%)
| 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 |
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.
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.
Recommend heat treatment:
| Quenching | Tempering | ||||
| Heating temperature/ºC | Cooling way | Hardness (HRC) | Tempering temperature/ºC | Cooling way | Hardness (HRC) |
| 850-880 | |||||
| Oil Cooling | 50-52 | 450-650 | Air | 25-40 | |
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)
Ready Stock:
Round Bar diameter 14-460mm.All the sizes as require can be customerized as fresh production with MOQ.
Delivery state:
Hot rolled, Heat Treatment,black, hardness or tempered hardness: 28-34 HRC.
Annealing: HBS<=235.
Product pictures:
Hot Forged Q+T Alloy Steel Special Steel SAE4140 SCM440 42CrMo 1.7225 EN19
Delivery time
For abundant stock, 15-20 days.For customized products, 30-35 days.
We have full set of equipement (sawing machine/grinding/polishing machine) to make customer's specification.
Our service for you
Pre-sale service
1) Sample can be offered with sample charge can courier fee by buyer's side;
2) We have full stock, and can deliver within short time. Many styles for your choices;
3) Good Quality + Factory Price + Quick Response + Reliable Service, is what we are trying best to offer you;
3) All of our products are produce by our professional workman and we have our high-work-effect foreign trade team, you can totally believe our service.
After you choose
1) We will count cheapest shipping cost and make invoice to you at once;
2) Check quality again, then send out to you at 1-2working day after your payment;
3) Email you the tracking no, and help to chase the parcels until it arrive you.
After-sale choose
1) We are very glad that customer give us some suggestion for price and products;
2) If any question, please contact with us freely by e-mail or telephone.