Q235 type steel H beam, usually refers to the use of Q235 grade carbon structural steel made of H-section beam. Q235 is a common common carbon structural steel material, with good plasticity and toughness, widely used in construction, Bridges and other engineering fields. The "H beam" refers to a beam with a cross-section shape similar to the letter "H", which can effectively improve the utilization of materials and the bearing capacity of the member.

The "IPE" in the IPE 450 steel structure is actually a part of the I-beam type system defined in the European standard EN 10025-2:2004, where the "I" represents the I-beam, and the "P" indicates that the series is the design of parallel legs. "E" refers to the quality grade of the steel is S270 class of the European standard (equivalent to Q235B in the Chinese national standard GB/T 700). The number "450" refers to the height of this I-steel being approximately 450 mm. Therefore, IPE 450 actually describes a parallel leg European standard I-steel with a height of about 450mm, which is equivalent to Chinese Q235B grade steel.

To sum up, although both are made of Q235 grade carbon structural steel, the specific form of the product is different: the former is an H-shaped cross-section beam produced in accordance with Chinese standards; The latter is a parallel leg I-beam manufactured to European standards. However, in practical applications, according to project needs and personal preferences, both types of steel can be selected to build various types of steel structural parts.

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