Q235b Forgings-mechanical Properties-Chemical Composition-q235b Forgings Encyclopedia

q235b

Material name: Carbon Structural Steel

Brand: q235b

Standard: GB/t 700-1988

Characteristics and scope of application:

Need to be at room temperature impact test, V-type notch. Has a certain elongation, strength, good toughness and casting, easy stamping and welding, widely used in general mechanical parts manufacturing. Mainly used in construction, bridge engineering, high quality requirements of welded structural parts.

Chemical composition:

Carbon c:0.12~0.20

Silicon si:≤0.30

Manganese mn:0.30~0.70 (Boiling steel: 0.30~0.60)

Sulfur S: ≤0.045

Phosphorus p: ≤0.045

CR CR: allowable residual content ≤0.030

Ni-ni: allowable residual content ≤0.030

Copper cu: allowable residual content ≤0.030

Note: Deoxidation method: F, B, Z

Mechanical properties:

Tensile strength Σb (MPa): 375~460

Yield Strength Σs (MPa): ≤16: ≥235; >16~40: ≥225; >40~60: ≥215; >60~100: ≥205; > 100~150: ≥195; >150: ≥185

Elongation δ5 (%): ≤16: When ≥26;>16~40: ≥25;>40~60: ≥24;>60~100: ≥23;>100~150: ≥22;>150: ≥21

Impact work AKV (J): 20 ℃, ≥27

Specimen size: Specimen thickness (diameter)

Heat treatment Specification and metallographic structure:

Specification for heat treatment: hot rolled.

Microstructure: Ferrite + pearlite.

Delivery status: Generally hot-rolled (including controlled rolling) status of delivery. According to the requirements of the parties, the Agreement between the two parties, can also be the fire treatment status of delivery.