AISI 1045 / S45C High Strength Toughness Mild Carbon Steel Plate for Machine Parts

1. Grade Overview and Equivalents

Standards:

AISI 1045: American Iron and Steel Institute (AISI) standard for carbon steel, part of the "10xx" series (plain carbon steels).

S45C: Japanese Industrial Standard (JIS G4051) equivalent, widely used in Asia for machinery and automotive applications.

Classification: Medium-carbon steel (not mild steel, despite the term in some contexts) with 0.42–0.50% carbon content, offering a balance of strength, toughness, and machinability.

2. Chemical Composition (Typical, %)

Element	AISI 1045 Range	S45C Range	Notes
Carbon (C)	0.42–0.50	0.43–0.51	Key element for strength; higher C improves hardness but reduces ductility.
Manganese (Mn)	0.60–0.90	0.60–0.90	Enhances hardenability and tensile strength.
Phosphorus (P)	≤0.040	≤0.030	Controlled to minimize brittleness.
Sulfur (S)	≤0.050	≤0.035	Lower S in S45C for better ductility/weldability.

3. Mechanical Properties

Property	As-Rolled (Typical)	Heat-Treated (Quenched & Tempered)
Yield Strength	≥295 MPa (43 ksi)	355–510 MPa (52–74 ksi)
Tensile Strength	570–700 MPa (83–102 ksi)	685–835 MPa (100–121 ksi)
Elongation (200 mm)	≥16%	≥13%
Hardness (HB)	170–210 HB	200–250 HB (after tempering)

 

 

 

 

 

 

Key Notes:

 

Heat Treatment: AISI 1045/S45C is often quenched and tempered to improve strength and toughness for critical machine parts.

Toughness: Moderate impact resistance (Charpy V-notch ~27 J at room temperature) when properly heat-treated.

4. Key Characteristics

Strength and Toughness Balance:

Higher carbon than mild steel (e.g., AISI 1018) provides superior tensile strength, making it suitable for load-bearing components.

Lower carbon than high-carbon steels (e.g., 1095) ensures better ductility and impact resistance.

Machinability:

Excellent machinability rating (~60% of AISI 1112 free-machining steel), ideal for turning, milling, and drilling.

Weldability:

Moderate weldability; preheating (100–200°C) and post-weld heat treatment (PWHT) are recommended for thick sections to prevent cracking.

Surface Hardening:

Can be case-hardened or induction-hardened for wear resistance in gears or shafts.

 

 

 

Why Choose Us?
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