What is the hardness of 4140 QT?

What is the hardness of 4140 QT?

AISI 4140 Q+T Round Bar Sales Promotion

Properties Metric Imperial
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 25.70% 25.70%
Hardness, Brinell 197 197
Hardness, Knoop (converted from Brinell hardness) 219 219

What material is SAE 4140?

4140 steel is a chromium, molybdenum, manganese low alloy steel plate that is known for its toughness, high fatigue strength, and high torsional strength.

What is the hardness of EN 353?


Mechanical Properties
Hardening 840-870
Queching oil
Tempering 150-200
Brinell Rockwell Hardness 150-200

How hard can you harden 4140 steel?

AISI 4140 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has a lower tempering temperature.

What is the hardness of EN8 material?


Heat Treatment Tensile Strength Rm Hardness
N 550 152/207
510 146/197
Q 625/775 179/229

What class is 8620 steel?

A medium-strength, low-carbon alloy steel, 8620 contains good toughness and strength properties, along with good core strength. 8620 has a high case toughness and above average core toughness due to the nickel content. Additionally, it is the most widely used carburizing alloy steel.

Can you machine hardened 4140?

4140 responds readily to heat treatment and is comparatively easy to machine in the heat-treated condition. 4140 resists creep in temperatures up to 1000 degrees Fahrenheit and maintains its properties even after long exposure at these high working temperatures. The chromium content provides good hardness penetration.