SACM645-JIS NITRIDING STEEL | 41CRALMO7 | EN41B
SACM645 steel is defined as Cr-M0-Al Nitriding steel as per JIS G4053 Standard.It has excellent wear resistance,high surface hardness and fatigue strength after nitriding.This material is generally supplied in annealed condition.SACM645 is usually used for high precision machine parts,typical use are cylinder lining, compressor parts,and hydraulic parts.
1.Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Mo | Al |
| SACM645 | 0.4-0.5 | 0.15-0.5 | ≤ 0.6 | ≤ 0.03 | ≤ 0.03 | 1.3-1.7 | 0.1-0.3 | 0.7-1.2 |
| 41CrAlMo7 | 0.38-0.45 | ≤ 0.4 | 0.4-0.7 | ≤ 0.025 | ≤ 0.035 | 1.5-1.8 | 0.2-0.35 | 0.8-1.2 |
2.Related Specifications
BS:EN41B
DIN/EN:41CrAlMo7/34CrAlMo5
GB:38CrMoAl
ANFOR:40CAD6.12/30CAD6.12
3.Heat Treatment & Mechanical Property
SACM645 Steel Annealing Details
1.Annealing temperature:800-850℃
2.Three steps for heating uniformly,enough time for temperature holding
3.Cooling in the furnace.
4.Max hardness:229HB
SACM645 Annealing Diagram
SACM645 Steel Quenching Details
1.Quench temperature:880-930℃
2.Three steps of temperature raising,holding time for thoroughly heated.
3.Oil quench.
4.Tempering immediately after quenched
SACM645 Steel Quenching Diagram
SACM645 Steel Tempering Details
1.Temper temperature:680-720℃
2.Air cooling.
SACM645 Tempering Diagram
SACM645-Mechanical Property With Quenching and Tempering
| Tensile Strength | Yield Strength | Elongation | Reduction of Area | Impact Charpy-V |
| ≥1000Mpa | ≥850Mpa | ≥15% | ≥50% | ≥90J |
4.Supply Size & Condition
| Form of Supply | Size(mm) |
| Round bar | Φ16-Φ500 |
| Square bar | Thinkness:Max 500 |
| Flat bar/Blcoks |
Thickness :120-500 Width:120-1,500 |
Heat treatment:Normalized / Annealed
Surface finish:Black / Rough turned / Peeled