Q235 Q345 H Beam Steel

1, Different characteristics.

Q235 elemental content A, B, C, D sulfur content in decreasing order; A and B have the same phosphorus content, C has the second highest phosphorus content, D has the least phosphorus content

Deoxidation method symbol:

F indicates boiling steel.

b indicates semi-sedated steel.

Z indicates a sedimented steel.

TZ indicates that the special sedation steel.

Sedation steel may not be marked symbols, that is, Z and TZ can not be marked. For example, Q235-AF indicates A grade boiling steel.

Special purpose carbon steel, such as bridge steel, marine steel, etc., basically using the carbon structural steel, but in the steel number at the end of the additional letters indicating the use.

Q345: commonly used medium carbon tempered structural steel. The steel cold plasticity in general, annealing, annealing than the tempering to slightly better, with higher strength and better machinability, after appropriate heat treatment can be obtained after a certain degree of toughness, plasticity and wear resistance, material sources convenient.

Q345A, B, C, D, E all contain Nb ≤ 0.07, V ≤ 0.15, Ti ≤ 0.20, Cr ≤ 0.30, Ni ≤ 0.012, Mo ≤ 0.10

Normalizing can improve the cutting performance of hardness less than 160HBS blank. The steel is tempered, its comprehensive mechanical properties to optimize the other medium carbon structural steel, but the steel hardenability is low, the critical quenching diameter in water is 12 ~ 17mm, water quenching tendency of cracking. When the diameter is greater than 80mm, after tempering or normalizing, its mechanical properties are similar, for medium and small mold parts after tempering treatment can obtain higher strength and toughness, and large parts, it is appropriate to normalize the treatment, so this steel is usually used in the state of tempering or normalizing.

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