General Information for Steel 4130
| Material Group |
P-Steel |
| Sub-Grou |
Low Alloy Steel |
| Tensile Strengt |
650-950[N/mm^2] |
| Machinability |
69% |
MACHINABILITY OF 4130 STEEL
SAE 4130 is chromium-molybdenum steel produced with 0.15–0.25% molybdenum and 0.8–1.1% chromium content. It has good hardenability, strength, wear resistance, toughness, and ductility. 4140 steel is used mainly on automotive parts such as connecting rods, engine mounting lugs, shafts, gears, and axles.
The hardness of these steels depends on the heat treatment:
155 HB - Annealed
165-220 HB-Normalized.
200 – 330 HB-Quenched.
The average machinability rating of 4130 steel is around 70% (Annealed condition).
SUMMARY:
For turning operations on 4130, it is best to use inserts with thick CVD coating and medium hardness. For milling, any all-around carbide grade is suitable.
For detailed carbide grades recommendations,check the table below.
Recommended Cutting speed range for turning at stable conditions is 840 - 1150 [SFM] / 255 - 350 [m/min].
Recommended Cutting speed range for milling with stable clamping and short over hang is 520 - 710 [SFM] / 160 - 215 [m/min]
For detailed cutting speed recommendations,check the table below.
Equivalent International Designations for Steel 4130
| Standard |
Name |
| SAE |
4130 |
| WNR |
1.7218 |
| DIN |
25CrMo4 |
| BS |
1717CDS110 |
| SS |
2225 |
| ANFOR |
25CD4 |
| UNI |
25CrMo4(KB) |
| UNF |
55Cr3AM26CrMo4 |
| JS1 |
SCM420-SCM430 |
Chemical Composition for Steel 4130
| Element |
Amount |
| Chromium(Cr)) |
.80-1.10% |
| Manganese(Mn) |
.40-.60% |
| Carbon(C) |
.28-.33% |
| Molybdenum(Mo) |
.15-.25% |
Cutting Speeds Recomendations for Steel 4130
| Application |
Vc (m/min) |
Vc (SFM) |
| Turning |
255-350 |
840-1150 |
| Milling |
160-215 |
520-710 |
| Parting |
125-165 |
410-540 |
| Grooving |
145-195 |
480-640 |
| Drilling |
105-140 |
340-460 |
Important! The speed estimation is given for an ideal situation:
- Most suitable carbide grade
- Stable tool clamping
- Stable workpiece clamping
- Good quality raw material
- A short overhang of the cutting tool.
- Nominal hardness of the material.
- etc.
Recommended Carbide Grades for Steel 4130
Grade for Milling (Indexable)
Recommended Insert Cutting Edge Geometry for Steel 4130
| Honing Siz |
0.05-0.08 mm / 0.002-0.003" |
| Rake Angl |
11° -13° |
| Land Angl |
Positive |
| Land Widt |
0.20-0.30 mm / 0.008-0.012" |
