JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
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42CrMo4 is a heat treatable steel which contains at least 0.9%Cr,0.15%Mo as strengthening elements.After quenched and tempered, It obtains high strength, good low-temperature impact toughness with a typical tensile strength of 900 -1200 N/mm2.42CrMo4 steel has better performance than 34CrMo4 steel due to the higher carbon and chromium content.Similar to AISI 4140,only a little difference in Mn,Cr content.This material also has good machinability,good wear-resistance,but the temper brittleness is not obvious,and poor in weldability.
1.Supply Form & Size & Tolerance
Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm
Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm
Plate/Sheet:Thickness :20-400mm xWidth:80-1000mm,Length:2000-6000mm
Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0,+5mm) | (0,+1mm) | (0,+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
2.Chemical Composition
| Grade | C | Si | Mn | Cr | Mo | P | S |
| 42CrMo4/1.7225 | 0.38-0.45 | ≤ 0.4 | 0.6-0.9 | 0.9-1.2 | 0.15-0.3 | ≤ 0.025 | ≤ 0.035 |
| 42CrMoS4/1.7227 | 0.38-0.45 | ≤ 0.4 | 0.6-0.9 | 0.9-1.2 | 0.15-0.3 | ≤ 0.025 | 0.02-0.04 |
3.Relevant Standards
| USA | UK | China | Japan | France | Russia |
| 4140 | EN19/708M40 | 42CrMo | SCM440 | 42CD4 | 42HM |
4. Mechanical Property
| Diameter d mm | ≤ 16 | 16-40 | 40-100 | 100-160 | 160-250 |
| Thickness t mm | < 8 | 8-20 | 20-60 | 60-100 | 100-160 |
| Yield Strength Mpa | ≥900 | ≥750 | ≥650 | ≥550 | ≥500 |
| Tensile Strength Mpa | 1100-1300 | 1000-1200 | 900-1100 | 800-950 | 750-900 |
| Elongation, % | ≥10 | ≥11 | ≥12 | ≥13 | ≥14 |
| Reduction of area ,% | ≥40 | ≥45 | ≥50 | ≥50 | ≥55 |
| impact | ≥30 | ≥35 | ≥35 | ≥35 | ≥35 |
5.Forging
42CrMo4 forging temperature:900 – 1100°C ,cooling as slowly as possible in still air or in sand after forged.
6.Heat Treatment
7.Surface Hardness
| NORMAL HARDENABILITY +H (850°C - hardness HRC – distance mm) | |||||||||||||||
| Distance mm | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
| HRC Min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 |
| HRC Max | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 |
8.Application
42CrMo4 has high strength and wear-resistance,widely used in many industries.
Components with high strength and toughness for tools, automotive parts,mechanical engineering, armament components,such as geer wheels,pinions,connecting rods,parts for mechanical engineering.
Statically and dynamically stressed components for vehicles, engines and machines. For parts of larger cross-sections, crankshafts,gears
When you are looking for 42CrMo4 material, what you need to know is that 42CrMo4, as a European grade, is one of the most commonly used steel grades. Faced with many 42CrMo4 steel suppliers with uneven quality levels.How to choose high-quality 42CrMo4 from them?Many people find it hard and challenging to understand, but in reality, it’s actually simple.
Through the guidance of this article, you can learn some necessary technical specifications about 42CrMo4 steel,so as to help you have the confidence and ability to choose high-quality 42CrMo4 materials.
Then, we will start to learn!
42CrMo4 Steel, refers to DIN 1.7225 steel.As one of the widely used Cr-Mo series of typical alloy steels, it has been adopted and included by major European standards, such as EN10083, EN10250 standard.
From the letters, we can guess that it contains Cr and Mo, so what do the other numbers represent? To understand this, let’s first understand the naming rules.
We can see the below Table 13 from EN10027 Standard:Designation systems for steels.
Key
1 = Principal symbols
2 = Additional symbols for steel
3 = Additional symbols for steel products
a n = numerical characters, a = alpha characters, an = alphanumeric characters.
b To distinguish between two similar steel grades, the number indicating carbon content may be increased by 1.
c The sequence of symbols shall be in decreasing order of the values of the average percentage content; where the values of contents are the same for two or more elements, the corresponding symbols shall be indicated in alphabetical order.
From the above information, we know that ’42’ in 42CrMo4 represents its average carbon content of 0.42%.This is the same as the last two ’40’ in the US grade 4140, which represents 0.4% of the carbon content.The last number 4 represents the average content of Cr is 4/4=1%,the Mo content is not mentioned.
42CrMo4 is European grade mainly from EN10083 and EN10250 standard,while EN19 is British grade from BS970-1955 standard.Although they are very close in chemical composition, they are different grades and can be considered eqnivalent grades.Through technical adjustments, we can adjust their components to the corresponding effective range in the table below, so that they can be used instead.
| 42CrMo4 | EN19 | Adjustment for EN19 and 42CrMo4 |
| C:0.38-0.45% | C:0.35-0.45% | C:0.38-0.45% |
| Si:≤ 0.4% | Si:0.10-0.35% | Si:0.15-0.35% |
| Mn:0.6-0.9% | Mn:0.5-0.8% | Mn:0.6-0.8% |
| Cr:0.9-1.2% | Cr:0.9-1.5% | Cr:0.9-1.2% |
| Mo:0.15-0.30% | Mo:0.2-0.40% | Mo:0.2-0.3% |
