Home / FAQ /

What are the differences between 45# steel and 40Cr steel?

What are the differences between 45# steel and 40Cr steel?
Jul 19, 2021

45# steel belongs to high-quality carbon structural steel, and 40Cr steel belongs to GB3077 alloy structural steel. The difference is after heat treatment. The main role of Cr in heat treatment is to improve the hardenability of steel. Due to the increase in hardenability, the mechanical properties of 40Cr steel after quenching (or quenching and tempering), such as strength, hardness, and impact toughness, are also significantly higher than those of 45# steel. But also because of the strong hardenability, the internal stress of 40Cr during quenching is greater than that of 45# steel. Under the same conditions, the cracking tendency of 40Cr material is greater than that of 45# steel.

alloy steel 40Cr

Therefore, in order to avoid cracking of the workpiece, the oil with lower thermal conductivity is mostly used as the quenching medium during 40Cr quenching (sometimes the double liquid quenching method is also used, as the saying goes, water quenching oil cooling). And 45# uses water with higher thermal conductivity as the quenching medium.

After quenching and low temperature tempering, the 40cr alloy plate is used to manufacture parts with heavy load, low impact and wear resistance, and the solid thickness of the cross section is below 25mm, such as worms, spindles, shafts, collars. After quenching and tempering and high-frequency surface quenching, 40cr steel is used to manufacture parts with high surface hardness and wear resistance without great impact, such as gears, sleeves, shafts, main shafts, crankshafts, spindles, pins, Connecting rods, screws, nuts, intake valves.

BBN Group to solve your What are the differences between 45# steel and 40Cr steel? You can also understand the common problems of all BBN Group products or services , and you can also learn about BBN Group products and services , cases .
I Want To...
Contacts
Hotline:0086-371-86151827
Latest News
More News
2024.12.17
API X42 and X52 are two common pipeline steel pipe materials, mainly used for transporting liquids or gases such as oil and natural gas. The differe
2024.12.17
API 5L X52 is a carbon steel pipeline steel, which is divided into two different product specification grades, PSL1 and PSL2, according to API stand
Get An Instant Quotation
Please fill out the form below (required *), send us a short message, and we will contact you as soon as possible.
Product&Service
  • Metallic materials
  • Metal processing
  • Pipe processing
  • Precision casting
  • Oil and gas storage equipment
  • Environmental Engineering Services
  • Furniture Life
  • Fertilizer Production Equipments
  • Fertilizer Production Lines
Consulting online customer service
0086-371-86151827
bb@bebonchina.com
International Leading Steel Supplier
BBN continues to enhance value creation and firmly promote social harmony
Copyright © 2020 by BBN Group All rights reserved 豫ICP备19040928号-1
Online
Email
Inquiry