SAE1045 medium carbon steel plate is a high-quality steel that meets the ASTM A29/A29M - 2012 standard. It is mainly composed of iron and 0.42% - 0.50% carbon. In addition, it contains a small amount of alloy elements such as silicon and manganese to improve its performance. It has been widely used in many industrial fields such as machinery manufacturing, the automobile industry, construction, and civil engineering.

Feature

Good welding performance
SAE1045 medium carbon steel plate has a moderate carbon equivalent, a small tendency to harden the heat-affected zone during welding, and good joint toughness. A variety of welding processes can be used, and the joint strength reaches 80%-90 % of the parent material, meeting the requirements of engineering structures.

Good cutting performance
The internal structure of the SAE1045 medium carbon steel plate is uniform, and the distribution of carbon elements makes the hardness and toughness of the steel moderate. During cutting, the friction between the tool and the steel is moderate, and the tool wears slowly. At the same time, moderate hardness and toughness make it easy to break and discharge the chips, avoiding chips wrapping around the tool and reducing tool damage.

Good wear resistance
Carbon elements form a layer of carbides with a higher hardness on the surface of the steel, which can effectively resist wear. Compared with Q235 (low carbon steel), the higher carbon content of SAE1045 makes its lattice structure tighter, the bonding force between atoms is stronger, and the formation of carbides is more complete, making SAE1045 a medium carbon steel plate more wear-resistant.v

Key Characteristics

Property	Value/Specification	Remarks
Carbon Content	0.42% - 0.50%	Medium carbon steel grade
Tensile Strength	600 - 800 MPa	Can be improved by heat treatment
Hardness	170 - 220 HB (annealed)	Up to 50-55 HRC when hardened
Density	7.85 g/cm³	Typical for carbon steels

International Equivalents

Country/Region	Standard	Equivalent Grade	Key Differences
China	GB/T 699	45#	Base standard, widely used
USA	ASTM A29	1045	Stricter control on impurities
Germany	DIN 17200	C45	Similar composition
Japan	JIS G4051	S45C	Higher purity level
EU	EN 10083-2	C45E	Improved machinability
Russia	GOST 1050	45	Nearly identical

Typical Applications

Industry	Application	Recommended Thickness
Automotive	Axle shafts Gear blanks Steering components	10-50mm
Machinery	Hydraulic press frames Machine tool beds Heavy-duty shafts	20-100mm
Mold Making	Injection mold bases Stamping die plates Fixture plates	30-150mm
Energy	Turbine shafts Bearing housings Coupling flanges	25-80mm
Construction	Heavy support beams Crane components Reinforcement plates	15-60mm
Agriculture	Tractor parts Harvester blades Plow components	10-40mm

Production Process

product-597-349

FAQ

Q: What is SAE1045 medium carbon steel plate?

A: SAE1045 medium carbon steel plate (GB/T 699) is a medium carbon steel (0.42%-0.50% carbon) with good strength and machinability, widely used in machinery parts after heat treatment.