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steel number
Classification description of steel grade representation methods
The impact of defects in billets on rolling

Summary of common terminology for automotive steel sheets

Summary of 5 terms for automotive steel sheets

  • Aging: Changes in the physical and mechanical properties of mild steel that occur after a period of storage. The aging process can be accelerated by increasing the temperature.
  • Annealing: The process of heating and cooling cold-rolled substrates at high temperatures after rolling to reduce hardness and make them softer or more formable.
  • Sickle bend: The deviation of the edge of one side of the strip from a straight line, measured by taking the concave side of a straight edge.
  • Carbon steel: Steel whose mechanical properties depend mainly on the carbon content of the steel, and which generally does not have a large amount of alloying elements added, sometimes called plain carbon steel or carbon steel.
  • Chemical treatment: The process of coating the surface of plated products with water-resistant anti-corrosion chemicals such as chromate or phosphate.

Summary of 7 terms for automotive steel sheets

  • Tensile strain marks: A series of parallel linear folds or irregular folds, orange peel, and other surface defects that appear on the plate at an angle of 45° to the direction of rolling after stamping and forming, generally extending to the full width of the automotive steel sheets or strip. It is caused by the aging of the steel.
  • Cold Rolled Product: A flat rolled product that is rolled at room temperature and meets the required dimensional requirements such as the final thickness.
  • Commercial Grade Steel (CS): Sheet of this quality can be used for simple bending or light forming. At room temperature, it can be bent and laminated to itself in any direction.
  • Continuous Casting: The process of continuously drawing and solidifying through the bottom of the crystallizer to form a continuous-like cast billet.
  • Corrosion: The chemical or electrochemical erosion of a metal that occurs gradually under the attack of moisture or other media in the atmosphere.
  • Critical surface: The surface used for exposure or painting use, surface defects that affect painting should be avoided.
  • Convexity: – The contour line from the edge of the steel plate to the center, which gradually increases in thickness.
automotive steel sheets

Summary of 5 terms for automotive steel sheets

  • Shear edge: The shape of the edge formed after shearing the edge of the strip to obtain the width specified by the user.
  • Shear length: A specified length of equal or unequal length.
  • Deep Punching: A process in which a metal blank is processed into a cup-like shape using a punching die on a punching machine.
  • Stamping: A machining process in which a blank is shaped into a concave part by forcing the plastic flow of metal through a punching die.
  • Steel for stamping (DS): Steel of this quality grade has higher ductility and uniformity of properties compared to commercial steel.

Summary of 5 terms for automotive steel sheets

  • Steel for deep-drawing (DDS): Steel for deep-drawing should be used when the ductility of steel for stamping does not meet the demanding requirements for manufacturing parts, or when the automotive steel sheets is required not to show aging. Its properties are obtained through a special smelting and manufacturing process.
  • Bake hardened steel: This steel has both strength and high formability. The strength of the final part is obtained through work hardening during processing and aging during baking.
  • Super deep-drawn steel: This steel has excellent formability and excellent property uniformity, and is a non-interstitial steel with very low carbon content and the addition of alloying stabilizing elements. It is a steel that does not undergo aging.
  • DS type B steel: Used for products with more stringent stamping and forming requirements.
  • Ductility: The ability to allow deformation before fracture occurs. For flat rolled steel, ductility is usually measured by hardness or mechanical properties in the tensile test.

Summary of 6 terms for automotive steel sheets

  • Elongation after break: The percentage of elongation of the specified length before fracture occurs in the tensile test.
  • Straightness: Straightness is a measure of the degree of conformity between the steel plate and the horizontal surface. Usually measured by the index of unevenness, it refers to the maximum deviation distance between the surface of the steel plate and the horizontal plane. Straightness can also be expressed in steepness or I units.
  • Hardness: The ability of a metal surface to resist indentation.
  • High Strength Low Alloy (HSLA): A specific type of steel in which the desired level of strength is obtained by adding small amounts of alloying elements. The most common alloying elements are niobium, vanadium, titanium, etc.
  • Hot Rolled Plate: automotive steel sheets that is rolled at high temperatures and processed to its final thickness in a hot rolling facility.
  • Hot Rolled Pickled Product: Hot rolled product that has been pickled, oiled, flattened and head and tail cut to meet specified dimensions and dimensional tolerances.

Summary of 6 terms for automotive steel sheets

  • Inclusions: Foreign substances (such as oxides, sulfides or silicates) present in the steel after casting.
  • Inclusion Shape Control: The use of rare earth metals or calcium alloys, etc. to control the shape of inclusions to provide improved mechanical properties for a specific application.
  • Sedated steels: Oxygen content in the steel is minimized by deoxidizing the steel with silicon or aluminum prior to solidification. Sedated steels have more uniform properties and chemical composition than other types of steels.automotive steel sheets
  • Straightening: The straightening of rolled plate by reducing or eliminating deformation.
  • Mechanical Properties: The properties of elastic and inelastic characteristics exhibited by a material when an external force is applied to it, used to indicate the suitability of a material for mechanical use.

Summary of 4 terms for automotive steel sheets

  • Oiling: Oiling after pickling or flattening rolling can reduce the abrasion between circles of steel coils, improve lubrication and have a certain degree of anti-rust performance, and provide some help to customers for the processing of products.
  • Oiled plate: Plate products with oiled surface after the final processing process. The purpose of oiling is usually to prevent rusting during transportation and storage. These oils are called rust prevention oils. Oiling can also assist in the subsequent processing, but this is usually not the primary purpose. Oils used to improve formability are often referred to as “pre-lubricants”.
  • Pickling: Removal of oxides from the metal surface by chemical reaction.
  • Pre-lubrication: An oily coating applied to a steel plate to improve formability (deep drawing). This lubricant is used when the user wishes to avoid coating his unit with forming lubricant.

Summary of 5 terms for automotive steel sheets

  • Quality: A term used to describe the degree of perfection of an automotive steel sheet. It usually refers to the surface quality of the steel sheet, for example the absence of scratches and cracks. Quality can also refer to other characteristics, such as the absence of internal defects, and the accuracy of dimensional control.
  • Roll Forming: The process of passing a sheet metal through a series of continuous rolls in order to achieve continuous primary deformation and obtain a predetermined shape.
  • Slitting: Process of cutting sheet metal lengthwise in the width direction into two or more pieces.
  • Zinc Frost: Usually refers to the appearance of the grains that form as the zinc layer cools and solidifies after the hot-dip galvanised sheet has been drawn from the zinc pan. The size, brightness and surface appearance of the zinc bloom depends on a range of factors, but is primarily related to the zinc layer composition and cooling method.
  • Structural Steel: Steel that meets specific strength and formability grades. Formability