Low-alloy and micro-alloyed steels (LA or HSLA)

Micro-alloyed steels achieve their high strength due to alloying with niobium, titanium, and vanadi‐ um. These alloying elements can be added individually or in combination. Alternatively, carbon manganese systems can be used in combination with grain refinement. 

Fine-grained steels (MC)

The fine microstructure of these micro-alloyed steels is achieved due to very finely distributed pre‐ cipitates (mostly carbides and/or nitrides) in connection with the final rolling in a certain tempera‐ ture range – the thermomechanical rolling. Due to their fine grain structure, fine-grained steels have a high fatigue limit.

High-strength IF steels (IF) 

Like the soft IF steels, high-strength IF steels have extremely low carbon contents and are stabi‐ lized by titanium and/or niobium. Therefore, these steels can be stored for a nearly unlimited time. The higher strength is achieved with solid solution hardening by adding manganese, phosphorus, and/or silicon. Very good formability is achieved due to the greater hardness, the lack of a pro‐ nounced yield point, high elongation at break, and high r values. 

Bake-hardening steels (BH) 

The strength is achieved with solid solution hardening by adding manganese, phosphorus, and sili‐ con. In bake-hardening steels, carbon dissolved in the lattice leads to a defined increase in the yield point when heat treatments are performed, such as the heat treatments that usually occur in automobile painting processes (e.g., 170 °C, 20 minutes). The buckling strength is thereby im‐ proved for skin parts. Because the change in the mechanical properties (yield point, elongation at break, tensile strain hardening exponent) occurs even at room temperature, albeit very slowly, the storage life of these steel grades is limited. 

Phosphorus-alloy steels (P) 

The strength is achieved with solid solution hardening by adding phosphorus. In regard to formabil‐ ity, these steels lie near the BH steels and between the micro-alloyed steels and the high-strength IF steels. Due to limited availability, the use of phosphorus-alloy steels must be agreed upon in ad‐ vance with Procurement. 

Dual-phase steels (DP)

The microstructure of dual-phase steels consists of a ferritic matrix, in which islands of a predomi‐ nantly martensitic second phase are embedded. With a high tensile strength, dual-phase steels have a low yield point ratio (Re /Rm) and a high cold work hardening rate. Therefore, they are espe‐ cially suited for stretch forming processes. 

TRIP steels

TRIP (Transformation induced plasticity) or residual-austenite steels have a fine-grained ferriticbainitic matrix structure, in which residual austenite is embedded. In addition, small fractions of martensite can be present. During deformation, the residual austenite is transformed into marten‐ site and thus causes a high cold work hardening rate. As a result, high tensile strength is achieved together with high elongation before reduction. In conjunction with the bake-hardening effect, high component strength can be achieved. TRIP steels are suitable for stretch forming as well as for deep drawing. However, higher pressing and sheet holder forces are required during forming, and a strong springback must be taken into account.

Complex-phase steels (CP)

Complex-phase steels have a largely ferritic-bainitic matrix structure, with fractions of martensite and/or tempered martensite, residual austenite, and pearlite. The extremely fine-grained micro‐ structure is achieved by retarded recrystallization or by the precipitation of microalloying elements. In comparison with dual-phase steels, these steels have higher yield points, a greater yield point ratio, a lower cold work hardening rate, and a higher hole expansion capability

Ferritic-bainitic steels (FB) 

Ferritic-bainitic steels have a matrix of ferrite or hardened ferrite, in which bainite or hardened bain‐ ite is embedded. The high strength of the matrix is caused by grain refinement, the precipitation of microalloying elements, and a high dislocation density. 

Martensitic steels (MS)

Martensitic steels have a largely martensitic microstructure with small fractions of ferrite and/or bainite and thus very high strength. Suitability for deep drawing is limited; these steel grades are suitable predominantly for forming methods involving bending, such as roll forming.

Galvanized brand：

VW50065-CR1-GI40/40-U-O VW50065-CR2-GI40/40-U-O VW50065-CR3-GI40/40-U-O

VW50065-CR4-GI40/40-U-O VW50065-CR5-GI40/40-U-O VW50065-CR6-GI40/40-U-O

VW50065-CR1-GI50/50-U-O VW50065-CR2-GI50/50-U-O VW50065-CR3-GI50/50-U-O

VW50065-CR4-GI50/50-U-O VW50065-CR5-GI50/50-U-O VW50065-CR6-GI50/50-U-O

VW50065-CR1-GI60/60-U-O VW50065-CR2-GI60/60-U-O VW50065-CR3-GI60/60-U-O

VW50065-CR4-GI60/60-U-O VW50065-CR5-GI60/60-U-O VW50065-CR6-GI60/60-U-O VW50065-CR1-EG29/29-E-P-O VW50065-CR2-EG29/29-E-P-O VW50065-CR3-EG29/29-E-P-O

VW50065-CR4-EG29/29-E-P-O VW50065-CR5-EG29/29-E-P-O VW50065-CR6-EG29/29-E-P-O VW50065-CR1-EG47/47-E-P-O VW50065-CR2-EG47/47-E-P-O VW50065-CR3-EG47/47-E-P-O

VW50065-CR4-EG47/47-E-P-O VW50065-CR5-EG47/47-E-P-O VW50065-CR6-EG47/47-E-P-O

VW50065-CR210LA-UC-U-O VW50065-CR240LA-UC-U-O VW50065-CR270LA-UC-U-O

VW50065-CR300LA-UC-U-O VW50065-CR340LA-UC-U-O VW50065-CR380LA-UC-U-O

VW50065-CR420LA-UC-U-O VW50065-CR460LA-UC-U-O VW50065-HR300LA-UC-U-O

VW50065-HR340LA-UC-U-O VW50065-HR420LA-UC-U-O VW50065-HR460LA-UC-U-O

VW50065-HR500LA-UC-U-O VW50065-HR300MC-UC-O VW50065-HR340MC-UC-O

VW50065-HR420MC-UC-O VW50065-HR460MC-UC-O VW50065-HR500MC-UC-O

VW50065-HR550MC-UC-O VW50065-HR700MC-UC-O VW50065 CR210LA GI40/40-U-O

VW50065 CR240LA GI40/40-U-O VW50065 CR270LA GI40/40-U-O VW50065 CR300LA GI40/40-U-O

VW50065 CR340LA GI40/40-U-O VW50065 CR380LA GI40/40-U-O VW50065 CR420LA GI40/40-U-O

VW50065 CR460LA GI40/40-U-O VW50065-CR180BH-GI40/40-E-O

VW50065-CR210BH-GI40/40-E-O VW50065-CR240BH-GI40/40-E-O

VW50065-CR180BH-GI50/50-E-O  VW50065-CR210BH-GI50/50-E-O

VW50065-CR240BH-GI50/50-E-O VW50065-CR180BH-GI60/60-E-O

VW50065-CR210BH-GI60/60-E-O VW50065-CR240BH-GI60/60-E-O

VW50065-CR160IF-GI40/40-U-O VW50065-CR180IF-GI40/40-U-O

VW50065-CR210IF-GI40/40-U-O VW50065-CR240IF-GI40/40-U-O

VW50065-CR210P-GI40/40-U-O VW50065-CR240P-GI40/40-U-O

VW50065-CR290Y490T-DP-GI40/40-U-O VW50065-CR330Y590T-DP-GI40/40-U-O

VW50065-CR440Y780T-DP-GI40/40-U-O VW50065-CR590Y980T-DP-GI40/40-U-O

VW50065-CR700Y980T-DP-GI40/40-U-O VW50065-CR570Y780T-CP-UC-U-O

VW50065-CR780Y980T-CP-UC-U-O VW50065-HR660Y760T-CP-UC-O

VW50111 St02Z-100NA-O VW50111 St03Z-100NA-O

VW50111 St04Z-100NA-O VW50111 St05Z-100NA-O

VW50111 St06Z-100NA-O

Chemical composition and mechanical properties：

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