GB/T 3273-1989 Hot-rolled Steel Plate for Automobile Beams - Brand and Chemical Composition, Properties and Performance
GB/T 3273-1989 hot-rolled steel plate for automobile beam is a hot-rolled steel plate punched from a slab by automatic continuous casting. The permeability and magnetic properties have been changed due to the mechanical processing. Hot-rolled steel plate for automobile beam has a brand and a chemical composition boundary, and the physical and mechanical properties should meet the specified requirements.
The steel plates referred to in this standard are divided into three grades according to their use: general use, non-high-strength and medium-strength. Due to the different properties of different grades of steel, the chemical composition and physical and mechanical properties of the steel have certain differences, and therefore the brand of the steel plates is also different. The brands of GB/T 3273-1989 hot-rolled steel plate for automobile beam and their chemical composition are identified according to the brand name.
The chemical composition of the GB/T 3273-1989 hot-rolled steel plate for automobile beams, including the maximum allowable mass fraction of sulfur, phosphorus and non-metallic inclusions, shall not exceed the specified requirements. The mechanical properties of the steel plate shall meet the requirements. Its strength shall be tested under normal temperature; its toughness shall be tested under normal temperature using charpy V-notch impact test pieces; its plastic properties shall be determined according to the specified requirements, and its heat treatment shall also meet the specified requirements.
The dimensions, shape and tolerances of GB/T 3273-1989 hot-rolled steel plate for automobile beams shall meet the requirements of the national standard. Any defects shall not meet the requirements of this standard. The surface quality of the steel plate shall meet the requirements of the national standard.
The inspection of the GB/T 3273-1989 hot-rolled steel plate for automobile beams shall be performed in accordance with the relevant national standards, and may be inspected visually, dimensionally and non-destructively (e.g. magnetic particle inspection).
This standard stipulates the brand and chemical composition, properties and performance of GB/T 3273-1989 hot-rolled steel plate for automobile beams, which plays an important role in guaranteeing the quality and performance of automobile beams made of hot-rolled steel plate. This standard is applicable to the hot-rolled steel plate used for the manufacture of automobile beams.
