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.

SACM645 FORGED ROUND BAR

1.Chemical Composition

GradeCSiMnPSCrMoAl
SACM6450.4-0.50.15-0.5≤ 0.6≤ 0.03≤ 0.031.3-1.70.1-0.30.7-1.2
41CrAlMo70.38-0.45≤ 0.40.4-0.7≤ 0.025≤ 0.0351.5-1.80.2-0.350.8-1.2

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:229HBSACM645 ANNEALING DIAGRAM

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 quenchedSACM645 quenching diagram

SACM645 Steel Quenching Diagram

SACM645 Steel Tempering Details
1.Temper temperature:680-720℃
2.Air cooling.SACM645 tempering diagram

SACM645 Tempering Diagram

SACM645-Mechanical Property With Quenching and Tempering

Tensile Strength Yield StrengthElongationReduction of AreaImpact Charpy-V
≥1000Mpa≥850Mpa≥15%≥50%≥90J

4.Supply Size & Condition

Form of SupplySize(mm)
Round barΦ16-Φ500
Square barThinkness:Max 500
Flat bar/BlcoksThickness :120-500
Width:120-1,500

Heat treatment:Normalized / Annealed
Surface finish:Black / Rough turned / Peeled