What is the difference between 45# steel and Q235 steel?

Bolts and nuts are available in various materials, each with distinct properties and applications. ONA always use 35#/45# steel, which 8.8 grade. If customers need 10.9 grade, we can customized too. Some customers ask what's the difference of material 35#/45# steel and Q235, Q335?

Difference between 35#/45# steel and Q235 steel?

Characteristic	35#/45# steel (medium carbon steel)	Q235 steel (low carbon steel)
Carbon Content	The carbon content of 35# steel is about 0.35%, and the carbon content of 45# steel is about 0.45%.	Carbon content less than 0.22%
Strength	High strength, tensile strength ≥600MPa, yield strength ≥355MPa	The strength is relatively low, with a tensile strength of 370-500MPa and a yield strength of about 235MPa
Hardness	The hardness is relatively high. Before heat treatment, the hardness is lower than HRC28. After quenching and tempering, the hardness can reach HRC22-HRC33	Low hardness, less than HRC20
Welding Performance	Poor welding performance, prone to cracks	Good welding performance, suitable for welding structural parts
Processing Performance	The processing is difficult and suitable for manufacturing high-strength mechanical parts.	Easy to process, suitable for cold working and welding operations
Heat Treatment	Frequent heat treatments such as quenching and tempering to improve hardness and wear resistance	Generally no heat treatment is performed and the heat treatment effect is not obvious
Usage	Used to manufacture high-strength mechanical parts such as shafts, gears, couplings, etc.	Used to manufacture welded structural parts such as steel structures, brackets, fences, platforms, etc.

Difference between Q235 steel and Q345 steel?

Characteristic	Q235 Steel	Q345 Steel
Carbon Content	Carbon content less than 0.22%	Carbon content <0.20%
Strength	Yield strength 235MPa, tensile strength 370-500MPa	Yield strength 345MPa, tensile strength ≥470MPa
Hardness	Lower hardness, better plasticity	Higher hardness and high strength
Welding Performance	Good welding performance, suitable for welding structural parts	The welding performance is better, but not as good as Q235
Processing Performance	Easy to process, suitable for cold working and welding operations	Good processing properties, but higher strength
Usage	Used for general structural parts, buildings, bridges, etc.	Used for structural parts and machinery manufacturing that require higher strength
Price	Lower price	The price is slightly higher, but it saves 15%-20% of steel compared to Q235

ONA is also processed stone crusher part according to the original factory drawings and materials, and the crusher wear part product quality is strictly controlled. Don't worry, if other materials and requirements are needed, we will provide professional suggestions, and after the customer's consideration, we will produce according to the customer's requirements.

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What is the difference between 45# steel and Q235 steel?