45# Carbon Steel Sheet/Plate

45# Carbon Steel (also known as 45 Steel) is a widely used medium carbon steel grade under the Chinese GB/T 699 standard. It is known for its high strength, good machinability, wear resistance, and heat treatment performance, making it suitable for mechanical parts, industrial equipment, shafts, gears, molds, and engineering components.

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Wuxi Jin Ming Jian De Industry & Trade Co., Ltd. is one of the leading manufacturers and suppliers of 45# carbon steel sheet/plate in China. If you're going to wholesale the newest 45# carbon steel sheet/plate made in China, welcome to get pricelist from our factory. All customized products are with high quality and competitive price.

Compared with low carbon steel such as 20# steel or Q235 steel, 45# carbon steel offers higher hardness and strength, especially after quenching and tempering heat treatment.

45# steel is commonly supplied in steel sheet, plate, round bar, forged parts, and machined components.

Equivalent Grades of 45# Carbon Steel:

Country / Standard	Equivalent Grade
China (GB)	45#
USA (ASTM/AISI)	1045
Japan (JIS)	S45C
Germany (DIN/EN)	C45 / C45E
Europe (EN)	C45E
UK (BS)	080M46
ISO	C45

45# steel is generally considered equivalent to AISI 1045 steel, though minor differences may exist in chemical composition and mechanical properties depending on standards.

Chemical Composition of 45# Carbon Steel:

Element	Content (%)
Carbon (C)	0.42–0.50
Silicon (Si)	0.17–0.37
Manganese (Mn)	0.50–0.80
Sulfur (S)	≤ 0.035
Phosphorus (P)	≤ 0.035
Chromium (Cr)	≤ 0.25
Nickel (Ni)	≤ 0.30
Copper (Cu)	≤ 0.25