AISI 5140 Steel Round Bar Plate Sheet|DIN 1.7035 |JIS SCr440
AISI 5140 Steel Catalog
Introduction
Grade Equivalent
Chemical Composition
Mechanical Properties
Heat Treatment
Application
Test
Introduction
What is AISI 5140 Steel?
AISI 5140 steel also can be called JIS Scr440 and DIN 1.7035 steel.AISI 5140 steel round bar is one of the alloy steel as well as the most popular steel grades in the productions of the machine. The AISI 5140 steel price is on the medium level and it was easy to processing. After tempering and quenching, the toughness, plasticity and wearing resistance of it will get better. Steel normalizing can make the spheroidizing for the organization of steel get easier. And it will raise the machinability of the semi-finished product with the hardness less than 160HBS. Tempering it at the temperature of 550℃-570℃ which can make it get better mechanical property. And the hardenability of it is higher than S45C steel. You can check 5140 Steel chemical composition and mechanical properties as below.
AISI 5140 Steel Round Bar Grade Equivalent
| Country | China | USA | Germany/UK/France | ISO | Japan |
|---|---|---|---|---|---|
| Standard | GB/T 3077-1999 | ASTM A29/A29M-05 | EN 10083/3-2006 | ISO 683/1:1987 | JIS G4053-2008 |
| Grades | 40Cr (A20402) 40CrA (A20403) 40CrE (A20406) |
5140 | 41Cr4 (1.7035) | 41Cr4 | SCr440 |
Song Shun AISI 5140 Steel Round Bar Chemical Composition
| Stand/Grade | C (%) | Mn(%) | P(%) | S (%) | Si (%) | Cr (%) | Ni (%) |
|---|---|---|---|---|---|---|---|
| ASTM A29/5140 | 0.38-0.43 | 0.70-0.90 | ≤0.035 | ≤0.040 | 0.15-0.35 | 0.70-0.90 | – |
| EN 10083-3/1.7035 | 0.38-0.45 | 0.60-0.90 | ≤0.025 | ≤0.035 | ≤0.40 | 0.90-1.20 | – |
| JIS G4053-2008/SCr440 | 0.38-0.43 | 0.60-0.90 | ≤0.030 | ≤0.030 | 0.15-0.35 | 0.90-1.20 | ≤0.25 |
Mechanical Properties
AISI 5140 Steel Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | ＞980 MPa | 142140 psi |
| Yield strength | ＞785 MPa | 113855 psi |
| Elongation at break | ＞9% | ＞9% |
| Reduction of area | ＞45% | ＞45% |
| Hardness | ≤207HB | ≤207HB |
Heat Treatment
AISI/SAE/ASTM 5140 Steel Heat Treatment
Heat treatment specification: quenching at 850℃, oil cooling; tempering at 520℃, water cooling, oil cooling
5140 surface quenching hardness is 52-60HRC, flame quenching can reach 48-55HRC
Nitriding treatment
1.7035 is a nitridable steel, and the elements it contains are conducive to nitriding. 40Cr can obtain higher surface hardness after nitriding treatment, the highest hardness of 40Cr after nitriding treatment can reach 72~78HRA, and the core hardness can reach 43~55HRC.
Nitriding workpiece process route: forging – annealing – roughing – quenching and tempering – finishing – stress relief – rough grinding – nitriding – fine grinding or grinding. Since the nitrided layer is thin and brittle, a high-strength core structure is required, so quenching and tempering heat treatment should be performed first to obtain tempered sorbite to improve the mechanical properties of the core and the quality of the nitrided layer.
Weldability of 5140 steel:
It is easy to segregate during crystallization, and is sensitive to crystallization cracks (a kind of thermal cracks), and it is easy to crack in arc craters and concave parts of welds during welding. The carbon content is high, and it is easy to obtain a hardened structure (martensitic structure) that is sensitive to cold cracks during rapid cooling. When the cooling rate of the superheated zone is large, it is easy to form hard and brittle high-carbon martensite to embrittle the superheated zone.
Welding process points
1. Generally, welding is carried out in the annealed (normalized) state.
2. The welding method is not limited.
3. Use larger line energy to appropriately increase the preheating temperature. Generally, the preheating temperature and interlayer temperature can be controlled between 250 and 300 °C.
4. The welding material should ensure that the composition of the deposited metal is basically the same as that of the base metal, such as J107-Cr.
5. Quenching and tempering heat treatment should be carried out in time after welding. If it is difficult to carry out the quenching and tempering treatment in time, intermediate annealing or holding for a period of time at a temperature higher than preheating can be carried out to eliminate diffusible hydrogen and soften the structure. For products with complex structure and many welds, an intermediate annealing can be performed after a certain number of welds have been welded.
Application
JIS SCr440 AISI 5140 alloy steel is quenched and tempered and used to manufacture mechanical parts that are subjected to medium load and medium speed work, such as steering knuckles of automobiles, rear half shafts and gears, shafts, worms, splined shafts, top sleeves, etc. on machine tools ; Also used for low and medium stress parts of vehicles, engines and machines where hard wear surfaces are required. After quenching and tempering at medium temperature, it is used to manufacture parts that withstand high load, impact and medium speed work, such as gears, spindles, oil pump rotors, sliders, collars, etc.; after quenching and low temperature tempering, it is used to manufacture parts that withstand heavy loads , Low impact and wear-resistant parts with a solid thickness of less than 25mm on the section
Test
How is ASTM 5140 steel tested?
AISI 5140 Steel Chemical Composition Testing-Spectrometer
We are sae 5140 Alloy Structural Steel for composition testing using spectrometer.The spectrometer one-time excitation of the sample to analyze its composition method is widely accepted by the public at this stage.Compared with traditional analytical methods, the advantages of spectrometers for the detection of modern steel components are fast, accurate and efficient. This method can directly inject solid samples without chemical digestion, which can reduce the human error caused by the digestion process and the constant volume process; to good quality steel.
