High formability steels for drawing

Transcription

1 Automotive Worldwide High formability steels for drawing Extract from the product catalogue -European edition Note: Information contained in this catalogue is subject to change. Please contact our sales team whenever you place an order to ensure that your requirements are fully met. Please contact us if you have a specific requirement that is not included in the range of products and services covered by this catalogue. We are also reachable by the address automotive.request@arcelormittal.com.

2 We are also reachable by the address High formability steels for drawing Drawing steels Description This range of non-alloyed mild steels is designed for deep and extra deep drawing applications. These products are used extensively in the automotive industry, both for visible and structural parts. The guaranteed low scatter in their mechanical properties ensures optimum productivity in drawing press operations. The range of cold rolled steels has been extended to include the ultra high drawability quality ArcelorMittal 07, ensuring maximum efficiency in the production of the most difficult-to-form parts (body sides, door liners, tailgates, etc.). The range of ArcelorMittal hot rolled mild steels covers the four levels of drawing difficulty listed below: : for drawing, with minimum guaranteed yield strength : for deep drawing : for very deep drawing ArcelorMittal 15: for drawing particularly difficult parts requiring performance regularity at high production rates (transfer presses). These ArcelorMittal steel grades are non-ageing, conserving their mechanical properties and their formability over time. They are also suitable for class 1 hot dip galvanizing according to the EN standard. The ArcelorMittal range offers better guarantees than the usual standard-compliant drawing steels, while remaining compatible with standards. Applications These ArcelorMittal steels are designed for deep and extra deep drawing of visible and structural parts. Door lining in ArcelorMittal 54 Extragal (thickness: 0.7 mm) Load floor in ArcelorMittal 54 Extragal (thickness: 0.7 mm) 2

3 Wheel arch in ArcelorMittal 57 Extragal (thickness: 0.9 mm) Crankcase in ArcelorMittal 57 Extragal (thickness: 1 mm) Designation and standard DC01 (+ZE) ArcelorMittal 01 CR1 (-UNC,-EG) ArcelorMittal 02 ArcelorMittal 03 DC03 (+ZE) CR2 (-UNC,-EG) ArcelorMittal 04 DC04 (+ZE) CR3 (-UNC,-EG) ArcelorMittal 05 DC05 (+ZE) CR4 (-UNC,-EG) ArcelorMittal 06 DC06 (+ZE) CR5 (-UNC,-EG) ArcelorMittal 07 DC07 (+ZE) Uncoated (EN :2006): Steel grade name Electrogalvanized (EN :2017): Steel grade name +ZE Uncoated: Steel grade name-unc Electrogalvanized: Steel grade name-eg 3

4 DX51D (+Z, +ZF) ArcelorMittal 51 ArcelorMittal 52 DX52D (+Z, +ZF) CR1 (-GI,-GA) ArcelorMittal 53 DX53D (+Z, +ZF, +ZM) CR2 (-GI,-GA,-ZM) ArcelorMittal 54 DX54D (+Z, +ZF, +ZM) CR3 (-GI,-GA,-ZM) ArcelorMittal 56 DX56D (+Z, +ZF, +ZM) CR4 (-GI,-GA,-ZM) ArcelorMittal 57 DX57D (+Z, +ZF, +ZM) CR5 (-GI,-GA,-ZM) Galvannealed (EN :2015): Steel grade name +ZF Extragal/Ultragal for visible parts (EN :2015): Steel grade name +Z Zagnelis (EN :2015): Steel grade name +ZM Galvannealed: Steel grade name-ga Extragal/Ultragal for visible parts: Steel grade name-gi Zagnelis: Steel grade name-zm DD11 DD12 DD13 DD14 HR2 (-UNC,-GI) ArcelorMittal 15 ArcelorMittal 16 Uncoated (EN :2008): Steel grade name Uncoated: Steel grade name-unc Extragal: Steel grade name-gi While the ArcelorMittal grades conform perfectly well to the indicated EN standards, ArcelorMittal grades generally offer tighter mechanical properties (see table below). The above indicative tables summarize the European and VDA standards corresponding to the ArcelorMittal product range. Technical characteristics These ArcelorMittal steels have high drawability as a result of the tight margins in their chemical composition and mechanical properties, ensuring consistent behavior during secondary processing. Mechanical properties Guaranteed for uncoated sheet in the transverse direction YS (MPa) UTS (MPa) ef (%) L0 = 80 mm th < 3 mm ArcelorMittal ArcelorMittal ArcelorMittal ArcelorMittal Ef (%) L0 = 5,65 S0 (mm) th 3 mm r n 1,3 0,16 1,3 0, ,8 0,19 ArcelorMittal ,9 0,21 ArcelorMittal ,2 0,22 ArcelorMittal ArcelorMittal ,3 0,16 ArcelorMittal ,3 0,17 ArcelorMittal ,8 0,19 ArcelorMittal ,9 0,21 ArcelorMittal ,2 0,22 4

5 ArcelorMittal ArcelorMittal ArcelorMittal ,5 0,24 The n, r and elongation guarantees are reduced slightly with Galvannealed coating, resulting in a loss of 0.3 in the r coefficient and about 2% in elongation. Please consult us for more information. For products with a thickness of 0.7 mm or less, the minimum guaranteed fracture elongation values should be reduced by 2 units. ArcelorMittal 57 for skin parts has a guaranteed yield strength of 130 to 170 MPa instead of 120 to 160 MPa. Interstitial-free (IF) metallurgy is systematically used to produce ArcelorMittal 06 and 07. This type of metallurgy is also required for the hot-dip coated (Extragal and Galvannealed) versions of ArcelorMittal 54 and 56. Microstructure of ArcelorMittal 56 (IF-Ti B type metallurgy) Chemical composition (%) C Max Mn Max Si Max ArcelorMittal 01 0 ArcelorMittal 02 0 ArcelorMittal 03 0 ArcelorMittal 04 ArcelorMittal 05 0,060 0,35 ArcelorMittal 06 0,010 0,25 ArcelorMittal 51 0 ArcelorMittal 52 0 ArcelorMittal 53 0 ArcelorMittal 54 ArcelorMittal 56 0,060 0,35 ArcelorMittal 57 0,010 0,25 ArcelorMittal 07 0,010 0,25 0 0,40 0,35 0,35 ArcelorMittal 15 0,30 ArcelorMittal 16 0,30 5

6 Available coatings and Worldwide availability Uncoated Electrogalvanized Extragal EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI ArcelorMittal 01 / 51 ArcelorMittal 02 / 52 ArcelorMittal 03 / 53 ArcelorMittal 04 / 54 ArcelorMittal 05 / 56 ArcelorMittal 06 / 57 ArcelorMittal 15 / 16 Ultragal Galvannealed Zagnelis EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI ArcelorMittal 01 / 51 ArcelorMittal 02 / 52 ArcelorMittal 03 / 53 ArcelorMittal 04 / 54 ArcelorMittal 05 / 56 ArcelorMittal 06 / 57 ArcelorMittal 15 / 16 Available in non-visible part quality quality (Z) Undergoing customer testing Under development Available in visible and non-visible part EUR : Europe Region -NAM : North America Region -SAM : South America Region -RSA : South Africa Region -CHI : China X available -XX available in visible part quality Recommendations for use and secondary processing 6

7 Recommendations for use and secondary processing Forming This family of ArcelorMittal steels has high and even very high drawability in all deformation modes (low yield strength and high ductility and normal strain ratio). They can be used to manufacture complex parts incorporating several functions, generating cost savings. Forming limit curves can be used to define the maximum strains without necking for different deformation paths. Examples of forming limit curves calculated for cold rolled steels in the ArcelorMittal 03 to 07 range (thickness: 1.0 mm) Welding Resistance spot welding The table below gives examples of resistance spot welding parameters for ArcelorMittal products, determined according to the ISO standard. The resistance spot weldability of hot rolled ArcelorMittal products is similar to that of cold rolled products of the same grade (C/Mn). Welding range (ka) ArcelorMittal 03 Electrogalvanized (thickness: 0.75 mm) 2,0 ArcelorMittal 54 Extragal (thickness: 1.5 mm) 1,7 ArcelorMittal 05 Electrogalvanized (thickness: 0.8 mm) 1,9 ArcelorMittal 06 Electrogalvanized (thickness: 0.8 mm) 1,8 (thickness: 2.5 mm) 3,0 Arc welding The electric arc weldability of ArcelorMittal steels is similar to that of the equivalent C and Mn structural steels. The table below gives welding recommendations for different arc welding processes. The chemical composition of ArcelorMittal steels supports all welding processes without pre-or post-treatment. Filler materials recommended for arc welding Encased Electrode (SMAW) Esab OK SAF Safer MF48 Gaz with fuse wire (GMAW and FCAW) OK Autrob OK Tubrod Nertalic 70 S 7 Flux (SAW) Flux AS50 Wire AS26

8 Based on its long shop-floor experience in resistance spot welding and arc welding characterization of its products, ArcelorMittal can provide technical assistance in adjusting the welding parameters for any product in the ArcelorMittal range. Fatigue strength Fatigue strength can be expressed as an endurance limit (maximum stress). Examples of Wöhler curves for a variety ArcelorMittal steels are shown in the graph below. The curves plot maximum stress versus number of cycles to failure. They are calculated for a tension-tension loading ratio of R=0.1. Wöhler curves for ArcelorMittal steels (cold rolled) ArcelorMittal can provide a full data base with fatigue performance values for the ArcelorMittal range of products. ArcelorMittal Last update: