AISI 5140 steel also can be called JIS Scr440 and DIN 1.7035 steel. It is one of the alloy steel. And it is one of the most popular steel grades in the productions of the machine. The 5140 steel round bar 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 heat treatment as below.

5140 Steel Application

After hardening and tempering, it can be used to make the fittings for machines with high medium load and speed of work. Such as the automobile knuckle, gear wheel and axis of the machine tools. If it had been quenching and tempering with medium temperature, it will be a great choice for fittings with high load, low impact and good wearing resistance. Such as the gear wheel, lantern ring and etc. And after quenching and low-temperature tempering, the properties will be better than the last one. People usually use it to make the parts with good wearing resistance and handle high load, low impact. And you can see the principal axis, mechanical bolt and etc are made of it.


1.7035 Steel Physical Properties

Density7.85 g/cm³0.284 lb/in³

1.7035 Steel Mechanical Properties

Tensile strength570 MPa82700 psi
Yield strength295 MPa42800 psi
Elastic modulus190-210 GPa27557-30458 ksi
Bulk modulus (typical for steel)140 GPa20300 ksi
Shear modulus (typical for steel)80 GPa11600 ksi
Poisson’s ratio0.27-0.300.27-0.30
Izod Impact41.0 J30.2
Hardness, Brinell167167
Hardness, Knoop (converted from Brinell hardness)188188
Hardness, Rockwell B (converted from Brinell hardness)8585
Hardness, Vickers (converted from Brinell hardness)175175
Machinability (annealed and cold drawn, based on 100 machinability for AISI 1212 steel)6565

5140 Steel Grade Equivalent Chart

StandardGB/T 3077-1999ASTM A29/A29M-05EN 10083/3-2006ISO 683/1:1987JIS G4053-2008
Grades40Cr (A20402)
40CrA (A20403)
40CrE (A20406)
514041Cr4 (1.7035)41Cr4SCr440

5140 Steel Round Bar Chemical Composition

GB/T 3077-199940Cr (A20402)0.37-0.440.50-0.80≤0.035≤0.0350.17-0.370.80-1.10≤0.30≤0.15≤0.30
GB/T 3077-199940CrA (A20403)0.37-0.440.50-0.80≤0.025≤0.0250.17-0.370.80-1.10≤0.30≤0.10≤0.25
GB/T 3077-199940CrE (A20406)0.37-0.440.50-0.80≤0.025≤0.0150.17-0.370.80-1.10≤0.30≤0.10≤0.25
ASTM A29/A29M-0551400.38-0.430.70-0.90≤0.035≤0.0400.15-0.350.70-0.90---
EN 10083/3-200641Cr4 (1.7035)0.38-0.450.60-0.90≤0.025≤0.035≤0.400.90-1.20---
ISO 683/1:198741Cr40.38-0.450.60-0.90≤0.035≤0.0350.10-0.400.90-1.20---
JIS G4053-2008SCr4400.38-0.430.60-0.90≤0.030≤0.0300.15-0.350.90-1.20≤0.25--

5140 Steel Sheet Plate Round Bar Heat Treatment

The ways of heat treatment for 1.7035 steel are normalizing, annealing, quenching, tempering and etc.

Quenching it at the temperature of 850℃ and oil cooling.

Tempering at the temperature of 520℃, then water-cooling and oil cooling.

After quenching, the surface hardness of it is 52-60HRC.

Nitrogen Treatment

5140 steel can nitriding, and the elements of it are good for nitriding. After nitriding, it can get higher surface hardness. And after nitriding, hardening and tempering, the max hardness can up to 72-78HRA. And the hardness of core will be 43-55HRC.

Nitrogen Process

  1. Forging
  2. Annealing
  3. Rough machining
  4. Hardening and tempering
  5. Finish machining
  6. Stress relieving
  7. Rough grinding
  8. Nitriding
  9. Lapping

We are a professional special steel stockist and supplier with a high-quality stand for many years. As a professional 5140 steel supplier, please contacts us for any request. Songshun Steel always with you.