Steel Plate 45#

Standard and Grade Meaning

Standard:
Chinese national standard (GB/T 699-2015), belonging to high-quality carbon structural steel. It is named after its carbon content (approximately 0.45% C), widely used in mechanical manufacturing and engineering structures requiring medium strength and hardness.

 

Grade Explanation:

 

45#: Indicates the carbon content is about 0.42%–0.50% (typical 0.45%), with balanced mechanical properties (strength, plasticity, and toughness).

No alloying elements added, belonging to plain carbon steel, distinguished from low-alloy steel by its simple composition.

Chemical Composition (Typical Values, %)

Element	C	Si	Mn	P	S	Cr	Ni	Cu
45#	0.42–0.50	≤0.35	0.50–0.80	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25

 

Mechanical Properties (Hot-rolled or Normalized State)

Thickness (mm)	Yield Strength (≥MPa)	Tensile Strength (MPa)	Elongation (≥%, δ₅)	Impact Absorption Energy (Akv, ≥J)	Hardness (HBW)
≤100	355	600–725	16	Not specified (non-impact-focused)	197–255

 

Typical Applications

 

Processing and Heat Treatment

Machinability:

Good cutting performance in the normalized state; surface hardness increases after quenching, requiring carbide tools.

Welding:

Poor weldability due to medium carbon content; preheating to 150–250°C and post-weld heat treatment are recommended for thick sections to prevent cracking.

 

 

 

 

 

 

Market and Purchase Considerations

Production Sources: Major Chinese producers (Baowu, Ansteel) offer 45# steel plates in thicknesses of 4–200mm.

Delivery Conditions: Usually hot-rolled or normalized; quenched and tempered plates are available upon request.

Inspection Requirements:

Factory certifications: Chemical composition report, mechanical property test results.

For critical applications: Non-destructive testing (UT/MT) and hardness testing.

Corrosion Protection: Requires painting or galvanizing in corrosive environments (no inherent corrosion resistance).

 

Summary: 45# steel is a cost-effective medium-carbon steel ideal for mechanical components requiring moderate strength and hardness, with heat treatment enhancing its versatility. Its limitations in weldability and corrosion resistance should be considered for specific applications.

 

 

 

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