The difference between low alloy steel St52-3, St50-2, S355JR, S355J2, S355NL, A572 Grade 60, A633 Grade A, Q345B, SM490A

TAGS: St52-3 | SM490A | Q345B | A572 | S355JR | S355J2 | S355NL | steel |

Low alloy steel is a type of steel that contains a small amount of alloying elements, usually less than 10%, to improve its properties such as strength, durability, and corrosion resistance. Here are the differences between some common low alloy steel types:

• St52-3: This steel is commonly used in the manufacturing of tools and parts for the automotive industry, as well as in construction and engineering applications. It has high strength and good wear resistance.

• St50-2: Similar to St52-3, this steel is also used in the automotive industry and construction. It has higher tensile strength and better toughness than St52-3.

• S355ZhR: This steel is designed for use in structural applications, particularly in areas with harsh environmental conditions such as coastal regions. It has excellent corrosion resistance and can withstand high temperatures.

• S355Zh2: Similar to S355ZhR, this steel is also designed for use in structural applications and can withstand extreme weather conditions. It has higher carbon content than S355ZhR, which makes it stronger but more prone to cracking.

• S355NL: This steel is commonly used in the manufacture of bridges and other large structures. It has high strength and good weldability.

• A572 Grade 60: This steel is used in the manufacture of bridges and other large structures that require high strength and durability. It has a high tensile strength and good impact resistance.

• A633 Grade A: This steel is used in the manufacture of bridges and other large structures that require high strength and durability. It has a high tensile strength and good impact resistance.

• Q345B: This steel is commonly used in the construction industry for foundations, walls, and other structural applications. It has good bending ability and can be welded or bolted.

• SM490A: This steel is used in the manufacture of heavy machinery components such as gears, shafts, and axles. It has high strength and good wear resistance.

Here are some use scenarios and uses for each steel type:

Steel Type	Use Scenarios	Uses
St52-3	Automotive industry	Tooling, parts for engine components
St50-2	Automotive industry	Tooling, parts for engine components
S355ZhR	Construction, engineering	Structural applications, coastal regions
S355Zh2	Construction, engineering	Structural applications, extreme weather conditions
S355NL	Bridges, large structures	High strength, weldability
A572 Grade 60	Bridges, large structures	High strength, impact resistance
A633 Grade A	Bridges, large structures	High strength, impact resistance
Q345B	Construction	Foundations, walls
SM490A	Heavy machinery components	Gears, shafts, axles

Here is a table comparing the properties and use cases of various steel types:

Steel Type	Use Cases	Performance Parameters
Low-Alloy Steel St52-3	Tooling, structural components, engine parts, marine applications	Yield strength: 600 MPa, tensile strength: 850-1100 MPa, hardness: HB270-350
Low-Alloy Steel St50-2	Constructional components, machine parts, shipbuilding, heavy machinery	Yield strength: 450-620 MPa, tensile strength: 550-750 MPa, hardness: HB270-340
S355ZhR	Highway construction, bridges, railways, structural components	Yield strength: 550-720 MPa, tensile strength: 690-1180 MPa, hardness: HB270-340
S355Zh2	Highway construction, bridges, railways, structural components	Yield strength: 490-630 MPa, tensile strength: 830-1180 MPa, hardness: HB270-340
S355NL	Highway construction, bridges, railways, structural components	Yield strength: 490-630 MPa, tensile strength: 830-1180 MPa, hardness: HB270-340
A572 Grade 60	High-strength low-temperature steel for structural applications in extreme environments	Yield strength: 690-950 MPa, tensile strength: 1280-1620 MPa, hardness: HB270-340
A633 Grade A	Low-carbon high-strength steel for structural applications in bridge construction	Yield strength: 620-950 MPa, tensile strength: 1180-1620 MPa, hardness: HB270-340
Q345B	Low-carbon structural steel for building materials and machinery parts	Yield strength: 420-635 MPa, tensile strength: 510-785 MPa, hardness: HB270-340
SM490A	Super high-strength low-alloy steel for heavy equipment and mining applications	Yield strength: 930-1180 MPa, tensile strength: 1680-2290 MPa, hardness: HB270-345

Please note that these performance parameters are approximate values and may vary depending on factors such as manufacturing process and specific application.