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Alloy structure steel

DIN
ASTM
JIS
GB
Factory hardness
Feature
The main purpose
---
5120
---
20Cr
Annealed≤HB179
Has good hardenability, heat treatment has good mechanical properties
Various shafts, guide pins and bushings, etc.
1.7035
5140
---
40Cr
Annealed≤HB207 或
PrehardenedHRC26-32
Heat treatment has good toughness, ductility and wear resistance
Can be used for stretch film and plastic mold and small and medium punch
1.7337
---
SCM415
15CrMo
Annealed≤HB229
This steel has high strength and toughness, high hardenability
Various mechanical parts and die casting mold
1.7218
---
SCM420
20CrMo
Annealed≤HB229
This steel has high strength and toughness, high hardenability
Various mechanical parts and die casting mold
1.7220
4130
SCM430
30CrMo
Annealed≤HB229
This steel has high strength and toughness, high hardenability
Various mechanical parts and die casting mold
1.7225
4140
SCM440
42CrMo
Annealed≤HB229或
PrehardenedHRC26-32
This steel has high strength and toughness, high hardenability
Various mechanical parts and die casting mold
1.5715
8620
 -------
20CrNiMo
Annealed≤HB255
High permeability, no temper brittleness, weldability is quite good, the formation of cold cracking tendency is small, good machinability and cold strain and plastic
Commonly used in the manufacture of small cars, tractor engine and transmission in gear
1.8159
6150
SUF10
50CrVA
Annealed≤HB255
 
After heat treatment have good toughness
Reload die springs
1.6582
4340
SNCM439
40CrNiMoA
Annealed≤HB255
Have high strength, high toughness and good hardenability
Used for high strength, high toughness, and a larger cross-sectional dimension quenched more important parts, such as horizontal drive eccentric shaft forging machine, forging machine
1.8507
-------
SACM645
38CrMoAl
Annealed≤HB255
Has good mechanical properties and good performance nitride
Variety of precision parts, precision shaft